阅读说明：本技术 一种用于流体管道的压电薄膜阵列式压电俘能器 (Piezoelectric film array type piezoelectric energy harvester for fluid pipeline ) 是由 史伟杰 杨传辉 张添 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种用于流体管道的压电薄膜阵列式压电俘能器,以解决传统供能技术所带来的污染、更换频繁等诸多弊端以及在液体管路中进行能量收集等技术问题。本发明结构包括前端盖、水密接头、密封压盖、压电固定环、壳体、弹性缓冲垫块、压电薄膜(带塑封绝缘)、后端盖、O形圈、引流管、导线等。为了增加发电量本发明将多个压电薄膜进行环形阵列式排布,引流管的导流口采用了多种不同形状、不同尺寸的孔,并增加了弹性缓冲垫块用以增强压电薄膜的形变效果,进而显著提高压电俘能器的俘能效率。本发明能够在高压工况下进行俘能,且具结构紧凑、稳定性强等优势,在低电功耗电子设备以及压电式俘能技术领域具有广泛的应用前景。(The invention discloses a piezoelectric film array type piezoelectric energy harvester for a fluid pipeline, which aims to solve the technical problems of pollution, frequent replacement and the like caused by the traditional energy supply technology and the technical problems of energy collection in a liquid pipeline and the like. The structure of the invention comprises a front end cover, a watertight joint, a sealing gland, a piezoelectric fixing ring, a shell, an elastic buffer cushion block, a piezoelectric film (with plastic packaging insulation), a rear end cover, an O-shaped ring, a drainage tube, a lead and the like. In order to increase the power generation capacity, the piezoelectric films are arranged in an annular array manner, holes with various shapes and sizes are adopted in the flow guide port of the drainage tube, and the elastic buffer cushion block is added to enhance the deformation effect of the piezoelectric films, so that the energy harvesting efficiency of the piezoelectric energy harvester is obviously improved. The piezoelectric energy harvesting device can harvest energy under a high-voltage working condition, has the advantages of compact structure, strong stability and the like, and has wide application prospect in the technical field of low-power electronic equipment and piezoelectric energy harvesting.)

1. A piezoelectric thin film array piezoelectric energy harvester for a fluid pipeline, characterized in that: the device comprises a front end cover, a watertight connector, a sealing gland, a piezoelectric fixing ring, a shell, an elastic buffer cushion block, a piezoelectric film (with plastic package insulation), a rear end cover, an O-shaped ring, a drainage tube, a lead and the like. The middle positions of the front end cover and the rear end cover are liquid (gas) inlet holes, external threads are respectively arranged at the two ends of the front end cover and the rear end cover, a hexagonal prism-shaped wrench clamping position is arranged between the two external threads for fastening and dismounting, and an O-shaped ring groove is arranged on one end face of the rear end cover for sealing; the casing be cylindrical, both ends are equipped with the internal thread respectively and are used for connecting preceding, the rear end cap, the intermediate position is cylindrical cavity, process N (N is the positive integer that is more than or equal to 4) rectangle recess on cylindrical cavity basis and be used for placing the springiness cushioning cushion, set up a fixed pin and place the hole for preventing that piezoelectric fixing ring from rotating on the left end internal thread right side of casing and casing axis vertically face.

2. The piezoelectric thin film array piezoelectric harvester for fluid conduits of claim 1, wherein: the elastic buffer cushion block is a cuboid corrosion-resistant soft material, the cylindrical convex parts of the convex area on the upper surface of the elastic buffer cushion block are distributed at equal intervals, and the diameters of cylinders of the convex area are sequentially increased; the adopted piezoelectric film is rectangular, the positive electrode and the negative electrode are distributed at the same end, and the piezoelectric film is packaged in vacuum by using Mylar (YAEB type insulating material).

3. The piezoelectric thin film array piezoelectric harvester for fluid conduits of claim 1, wherein: the drainage tube is shaped like an N (N is a positive integer larger than or equal to 4) prism with a regular polygon cross section, a cylindrical diversion through hole is arranged in the middle of the drainage tube, a cylindrical drainage tube fixing head is respectively processed at two ends of the drainage tube and used for fixing the drainage tube, a fixing pin placing hole is arranged on the end face of the left end of the cuboid in order to prevent rotation, the side face of the drainage tube is a drainage hole area, the drainage holes are of two types, namely a rectangular diversion port and a circular diversion port, the number of the rectangular diversion ports is M (M is a positive integer larger than or equal to 1), the rectangular diversion ports are distributed in an equidistant mode overall, and the rectangular area is gradually increased from left to right; the two circular diversion ports are distributed at the rightmost end of the drainage tube, and the diameter close to the rectangular diversion port is slightly smaller.

4. A piezoelectric thin film array piezoelectric harvester for fluid conduits according to claim 1 or claim 3, wherein: the sealing gland is annular, N (N is a positive integer larger than or equal to 4) circular countersunk head through holes and N (N is a positive integer larger than or equal to 4) circular standard through holes are arranged on the sealing gland, the sealing gland is generally distributed in an equidistant annular array, the circular countersunk head through holes and the circular standard through holes are distributed at intervals in pairs, the circular countersunk head through holes are used for placing watertight joints, and the circular standard through holes are used for fixing bolts; the piezoelectric fixing ring is cylindrical, a circular through hole is formed in the middle of the piezoelectric fixing ring and used for feeding and discharging liquid (gas), and the left bottom surface and the right bottom surface are respectively provided with an O-shaped ring groove. The bottom surface of the leftmost end is also provided with a rectangular section groove for mounting a sealing gland, the bottom surface of the rectangular section groove is also provided with two O-shaped ring grooves for sealing, N (N is a positive integer which is not less than 4) threaded holes and N (N is a positive integer which is not less than 4) rectangular section through holes are respectively dug from the bottom surface of the groove, the whole is distributed in an equidistant annular array, the rectangular section through holes and the threaded holes are distributed at intervals in pairs, the threaded holes are used for fixing the sealing gland, the rectangular section through holes are used for placing piezoelectric films, the sections of the rectangular section through holes are different in size, the rectangular opening area close to the sealing gland is slightly larger, the purpose is to connect wires and add waterproof sealant, the rectangular opening area far away from the sealing gland is slightly smaller, and the piezoelectric film can be conveniently mounted. Two fixing pin placing holes are further formed in the bottom face of the right end and are used for fixing the piezoelectric fixing ring and the drainage tube respectively.

Technical Field

The invention relates to a piezoelectric film array type piezoelectric energy harvester for a fluid pipeline, and belongs to the technical field of energy supply of low-power consumption electronic equipment.

Background

With the continuous development of the industrial intelligence level, research and development of low-electric-power-consumption elements such as electromagnetic valves and sensors are advanced to a certain extent, and a large number of low-electric-power-consumption elements are widely applied to fluid pipeline systems. As is known, a pipeline system is widely applied to fluid transportation in industries such as fluid machinery and petrochemical engineering due to its unique characteristics, however, due to the influence of the inherent frequency of a pump, fluid media transported in the fluid pipeline system have abundant pressure pulsation energy, and if the pressure pulsation energy can be harvested and converted into electric energy to supply power to low-power consumption elements in the system, the complexity caused by an external power supply or a battery under complex working conditions is solved, and the purposes of energy conservation and environmental protection are achieved. Therefore, it is very urgent and necessary to research a piezoelectric energy harvester for supplying energy to a low-electric-power-consumption element of a fluid pipeline to overcome many disadvantages brought by the conventional energy supply technology.

The piezoelectric energy harvester is an energy collecting device, which converts the pressure potential energy of fluid into electric energy by utilizing the positive piezoelectric effect of piezoelectric materials, and has the advantages of high energy density, cleanness, no pollution, good mechanical-electrical conversion performance, easiness in miniaturization and the like, so that the piezoelectric energy harvester is widely researched by a large number of researchers at home and abroad. At present, most of piezoelectric energy harvesters are simple in structure, single in function, more applied to a pneumatic system, and rarely applied to liquid pipelines due to the influence of sealing and insulation problems. Therefore, the multifunctional piezoelectric energy harvester with high energy harvesting power and high efficiency is researched for abundant pressure pulsation energy in the liquid pipeline, and has very important practical significance for the development and application of the piezoelectric energy harvesting technology.

Disclosure of Invention

Aiming at pressure pulsation generated by medium flowing in a fluid pipeline, the invention provides a piezoelectric film array type piezoelectric energy harvester for a fluid pipeline, which can be applied to a pneumatic system and can also be installed in the fluid pipeline for harvesting energy.

A piezoelectric film array type piezoelectric energy harvester for a fluid pipeline comprises a front end cover 1, a watertight joint 2, a sealing gland 3, a piezoelectric fixing ring 4, a shell 5, an elastic buffer cushion block 6, a piezoelectric film (with plastic package insulation) 7, a rear end cover 8, O-shaped rings (9, 11, 12 and 14), a drainage tube 10 and a lead 13.

The middle position of the front end cover is a liquid (gas) inlet, external threads are arranged at the left end and the right end respectively, the external threads at the left end are used for connecting an outer pipeline, the external threads at the right end are used for connecting a shell, a protruding annular structure at the rightmost end is used for supporting a piezoelectric fixing ring, a certain reserved space is used for placing a wire, and a hexagonal prism-shaped wrench clamping position is arranged between the two external threads for fastening and dismounting.

The casing be cylindrical, both ends are equipped with the internal thread respectively and are used for connecting preceding, the rear end cap, the intermediate position is cylindrical cavity, process N (N is the positive integer that is more than or equal to 4) a rectangle recess on cylindrical cavity basis and be used for placing the springiness cushioning cushion, in order to prevent that solid fixed ring from rotating, set up a fixed pin on the left end internal thread right side of casing and casing axis vertically and place the hole.

The piezoelectric fixing ring is cylindrical, a circular through hole is formed in the middle of the piezoelectric fixing ring and used for feeding and discharging liquid (gas), and the left bottom surface and the right bottom surface are respectively provided with an O-shaped ring groove. Still be equipped with a rectangular cross section recess in leftmost end bottom surface department and be used for installing sealing gland, bottom surface at rectangular cross section recess still is equipped with two O shape circle grooves and is used for sealedly, dig N screw hole and N rectangular cross section through-hole respectively from this bottom surface of recess, its totality is equidistance annular array and arranges, two liang of interval distribution of rectangular cross section through-hole and screw hole, the screw hole is used for fixed sealing gland, rectangular cross section through-hole is used for placing piezoelectric film, its cross-section size of rectangular cross section through-hole is different, it is slightly bigger to be close to sealing gland department rectangle open area, its purpose is for connecting wire and joining waterproof sealant, keep away from sealing gland department rectangle open area slightly littleer, its purpose is convenient for install piezoelectric film. Two fixing pin placing holes are further formed in the bottom face of the right end and are used for fixing the piezoelectric fixing ring and the drainage tube respectively.

The sealing gland be the ring form, above be equipped with two kinds of N circular countersunk head through-holes and N circular standard through-holes, the totality is equidistance annular array and arranges, two liang interval distributions of circular countersunk head through-hole and circular standard through-hole, circular countersunk head through-hole is used for placing the watertight joint, circular standard through-hole is used for the bolt fastening.

The elastic buffer cushion block is a cuboid-shaped corrosion-resistant soft material, the cylindrical protruding parts of the protruding area on the upper surface of the elastic buffer cushion block are distributed at equal intervals, and the diameter of the cylinder of the protruding area is increased in sequence, so that the protruding effect is more and more obvious.

The middle position of the rear end cover is a liquid (gas) inlet, the left end and the right end of the rear end cover are respectively provided with an external thread, the left end external thread is used for connecting the shell, the right end external thread is used for connecting an outer pipeline, and a hexagonal prism-shaped wrench clamping position is arranged between the two external threads for fastening and dismounting; an O-ring groove is arranged on the end surface of the leftmost end.

The drainage tube is shaped like a N (N is a positive integer larger than or equal to 4) prism with a regular polygon section, a cylindrical diversion through hole is arranged in the middle of the drainage tube, a cylindrical drainage tube fixing head is processed at each of two ends of the drainage tube and used for fixing the drainage tube, and a fixing pin placing hole is formed in the end face of the left end of the cuboid for preventing rotation. The side surface of the drainage tube is provided with a drainage hole area, the drainage holes are of two types, namely rectangular diversion ports and circular diversion ports, the number of the rectangular diversion ports is M (M is a positive integer larger than or equal to 1), the rectangular diversion ports are distributed in an equidistant mode on the whole, and the rectangular area is gradually increased from left to right; the two circular diversion ports are distributed at the rightmost end of the drainage tube, and the diameter close to the rectangular diversion port is slightly smaller.

The piezoelectric film is rectangular, the positive electrode and the negative electrode are distributed at the same end, and the piezoelectric film is vacuum-packaged by adopting Mylar (YAEB type insulating material). When liquid is filled in a gap formed between the drainage tube and the piezoelectric film, the piezoelectric film is deformed by pressure pulsation generated by the liquid, and then electric energy is generated.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention is based on a piezoelectric film, recovers pressure pulsation energy in a fluid pipeline by adopting a piezoelectric energy harvesting technology, converts the pressure energy into electric energy for collection, and is used for driving low-electric-power-consumption elements such as an electromagnetic valve, a sensor and the like. The device can be arranged at any position in a pipeline, and has compact structure and stronger stability.

(2) The piezoelectric energy harvester adopts a plurality of piezoelectric films arranged in an annular array, can customize piezoelectric energy harvesters with different specifications according to different diameters of fluid pipelines, and the larger the diameter of the piezoelectric energy harvester is, the more piezoelectric films can be placed. Therefore, the power generation capacity is larger, and the energy harvesting efficiency is higher.

Drawings

FIG. 1 is a schematic view of the final assembly of the present invention;

FIG. 2 is a schematic structural view of a front end cap;

FIG. 3 is a cross-sectional view of the gland;

FIG. 4 is a perspective cross-sectional view of a left side view of the piezoelectric retaining ring;

FIG. 5 is a perspective view of a right side view of the piezoelectric retaining ring;

FIG. 6 is a schematic perspective view of the housing;

FIG. 7 is a perspective view of a resilient cushion block;

FIG. 8 is a schematic structural view of the rear end cap;

FIG. 9 is a perspective view of a drainage tube;

the above figures are labeled as: 1. a front end cover; 2. a watertight joint; 3. a sealing gland; 4. a piezoelectric fixing ring; 5, a shell; 6. an elastic buffer cushion block; 7. piezoelectric film (with plastic insulation); 8. a rear end cap; 9. 11, 12, 14, O-shaped rings; 10. a drainage tube; 13. a wire; 1.1, 8.3, hexagonal clamping part; 1.2, 1.3, 8.1, 8.2 external threads; 1.4, an O-shaped ring contact surface; 3.1, placing holes for watertight joints; 3.2, fixing a through hole by using a bolt; 4.1, 4.3, 4.5, 8.3 and an O-shaped ring placing groove; 4.2, fixing a cavity by the piezoelectric film; 4.4, a threaded hole; 4.6, 4.7, 5.2 and 10.2, and a fixing pin placing hole; 5.1, placing grooves for elastic buffer cushion blocks; 5.3, lead holes; 6.1, a raised area; 6.2 smooth zone; 10.1, 10.5, a drainage tube fixing head; 10.3 rectangular diversion ports; 10.4, a circular diversion port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. Fig. 1 shows an embodiment of the present invention, which includes a front end cap 1, a micro watertight connector 2, a gland 3, a piezoelectric fixing ring 4, a housing 5, an elastic cushion block 6, a piezoelectric film (with plastic-sealed insulation) 7, a rear end cap 8, O-rings (9, 11, 12, 14), a drainage tube 10, and a conducting wire 13.

The structure of the front end cover is shown in figure 2, the left end and the right end of the front end cover are respectively provided with an external thread 1.2 and an external thread 1.3, the external thread 1.2 is used for connecting an outer pipeline, the external thread 1.3 is used for connecting a shell 5, the end face 1.4 at the rightmost end of the front end cover is in contact with a piezoelectric fixing ring 4, and a hexagonal clamping part 1.1 between the two external threads is used for fastening and dismounting by using a spanner. As shown in fig. 8, the left end and the right end of the rear end cover are respectively provided with an external thread 8.1 and an external thread 8.2, the external thread 8.1 is used for connecting the shell 5, the external thread 8.2 is used for connecting an outer pipeline, and a hexagonal clamping part 8.3 between the two external threads is used for fastening and dismounting by using a spanner; 8.4 placed O-ring 9 seals in contact with the housing.

The sealing gland 3 is provided with 4 circular countersunk head 3.1 through holes and 4 circular standard through holes 3.2 as shown in figure 3, the whole is arranged in an equidistant annular array, the circular countersunk head through holes 3.1 and the circular standard through holes 3.2 are distributed at intervals, the circular countersunk head through holes 3.1 are used for placing the watertight connector 2, and the circular standard through holes 3.2 are used for fixing bolts.

The piezoelectric fixing ring is shown in figures 4 and 5, two end faces are respectively provided with an O-shaped ring groove 4.1 and 4.3, an O-shaped ring 14 in the groove 4.3 is in contact sealing with the front end cover 1, an O-shaped ring 11 in the groove 4.1 is in contact sealing with the shell 5, a rectangular cross-section groove is further arranged at the end face where the groove 4.3 is located and used for installing a sealing gland 3, two O-shaped ring grooves 4.5 are further arranged at the bottom surface of the rectangular cross-section groove and used for sealing, 4 rectangular cross-section through holes 4.2 and 4 threaded holes 4.4 are respectively dug from the bottom surface of the groove and are distributed in an equidistant annular array overall, the rectangular cross-section through holes 4.2 and the threaded holes 4.4 are distributed at intervals in pairs, the threaded holes 4.4 are connected through bolts and used for fixing the sealing gland 3, the rectangular cross-section through holes 4.2 are used for placing a piezoelectric film 7, the cross sections of the rectangular cross holes 4.2 are different in size and are close to the sealing gland 3, the rectangular opening area is used for connecting a lead 13 and adding waterproof sealant, the rectangular opening area remote from the gland 3 is slightly smaller for the purpose of facilitating the mounting of the piezoelectric film 7. Two fixing pin placing holes 4.6 and 4.7 are further provided at the end face of the groove 4.1 for preventing the drainage tube 10 and the piezoelectric fixing ring 4 from rotating relatively, respectively.

As shown in fig. 6, the housing 5 is provided with 4 rectangular grooves 5.1 for placing elastic cushion blocks 6 on the basis of the cylindrical cavity; in order to prevent the piezoelectric fixing ring 4 from rotating, fixing pin placing holes 5.2 and 4.7 are arranged to be matched with each other and inserted into a cylindrical metal fixing pin.

Further, as shown in fig. 7, the elastic cushion block 6 has cylindrical convex portions 6.1 of the convex area on the upper surface thereof distributed at equal intervals, and a concave area is formed between every two convex portions as shown in fig. 6.2.

The shape of the drainage tube is shown in fig. 9, the drainage tube is a quadrangular prism with a regular quadrilateral section, two ends of the drainage tube are respectively provided with a cylindrical drainage tube fixing head 10.1 and a cylindrical drainage tube fixing head 10.5 which are used for fixing the drainage tube 10, the cylindrical drainage tube fixing heads 10.1 are in contact fixation with the piezoelectric fixing ring 4, and the cylindrical drainage tube fixing heads 10.5 are in contact fixation with the rear end cover 8; in order to prevent the relative rotation, a fixing pin placing hole 10.2 is arranged on the left end face of the cuboid, matched with 4.6 in the piezoelectric fixing ring 4 and inserted with a cylindrical metal fixing pin. The side surface of the drainage tube is provided with a drainage hole area, the drainage holes are of two types, namely a rectangular diversion port 10.3 and a circular diversion port 10.4, and the number of the rectangular diversion ports is 11; the two circular diversion ports are distributed at the rightmost end of the drainage tube 10, and the diameter close to the rectangular diversion port is slightly smaller. In order to increase the effect of pressure pulsation on the piezoelectric film, the center of each rectangular diversion opening is over against the concave area 6.2 between the convex parts of the elastic buffer block.

Furthermore, the working principle of the piezoelectric energy harvester is as follows: liquid in a fluid pipeline enters from the front end cover 1 and flows out from the rear end cover 8 after entering through a drainage channel of the drainage tube 10, in the process, the piezoelectric film 7 is always in contact with the elastic buffer cushion block 6, the liquid enters and fills a gap between the piezoelectric film and the drainage tube under the action of a side flow guide port of the drainage tube 10, the pressure of the liquid in the gap fluctuates due to pressure pulsation generated by liquid flowing, so that the piezoelectric film is deformed to different degrees, the piezoelectric film continuously generates electric energy, the generated electric energy is stored or directly drives a low-power-consumption element through the lead 13, and when the fluid in the fluid pipeline is gas, the working principle of the fluid pipeline is the same as that of the liquid.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.