CN216134437U - Annular array type piezoelectric energy harvester with adjustable prepressing - Google Patents

Abstract

The utility model discloses an annular array type pre-pressing adjustable piezoelectric energy harvester which comprises an outer shell, a lower end cover, a cover plate, a piezoelectric energy harvesting component, an energy harvesting control component, a pre-pressing adjustable device and the like. The shell comprises a pressure cavity and a piezoelectric cavity, the pressure cavity is connected with an external pipeline system, and the piezoelectric cavity is used for placing a piezoelectric power generation device; the piezoelectric sheets are arranged on the lower end cover in an annular array and indirectly contact with the fluid through the energy capturing control assembly; the spring compression amount is adjusted through the pre-pressing adjustable device, and then the interaction effect of the pressure in the piezoelectric cavity and the spring force can reach the best. The piezoelectric energy harvester has the advantages of simple structure, high efficiency, strong practicability, no electromagnetic interference and the like, solves the problems of low energy collection efficiency and singleness of application places of the traditional piezoelectric energy harvester, and has very important practical significance and very wide application prospect in the collection of flow-induced vibration energy and the energy conservation of fluid transmission equipment.

Description

Annular array type piezoelectric energy harvester with adjustable prepressing

Technical Field

The utility model relates to an energy harvester, in particular to an annular array type piezoelectric energy harvester with adjustable prepressing.

Background

With the rapid development of the Chinese industry, hydraulic and pneumatic systems are widely used in many fields such as engineering machinery, metallurgy, machine tools, light textile, automobiles, agricultural machinery and the like. In many industrial applications, the transmission of fluids requires the transportation by means of pipes, which are an indispensable system element in the transmission and control of fluids. When hydraulic or pneumatic equipment normally operates, pressure pulsation is inevitable in a pipeline, and the abundant flow-induced vibration energy is wasted while equipment vibration and noise pollution are caused.

In recent years, the national requirements on energy conservation and environmental protection are continuously increased, and the flow-induced vibration piezoelectric energy harvesting technology is also widely researched. Among them, the piezoelectric energy harvesting technology using piezoelectric materials is a hot spot of energy harvesting technology research at home and abroad at present. The technology utilizes the deformation of the piezoelectric material in the flow resisting process through the fluid-solid coupling effect to generate electric energy, and has the advantages of simple structure, no electromagnetic interference, no pollution, no heat generation, easy integration and the like. However, at present, the research function of the piezoelectric energy harvester in China is too single, the energy collection efficiency is low, and the piezoelectric energy harvester with more functions, higher efficiency and stronger practicability is developed for improving the collection efficiency of the flow-induced vibration energy in the pipeline, so that the piezoelectric energy harvester has very important practical significance for the collection of the flow-induced vibration energy and the energy conservation of the fluid transmission equipment.

SUMMERY OF THE UTILITY MODEL

Aiming at the flow-induced vibration generated by the flow of a fluid medium in a hydraulic or pneumatic system, the utility model designs a multifunctional piezoelectric energy harvester, which adopts a piston reciprocating motion mode to drive a contact to contact with a piezoelectric sheet to deform. In order to increase the power generation capacity of the energy harvester, a plurality of piezoelectric sheets are arranged in an annular array manner; aiming at the working condition difference of pneumatic and hydraulic systems, the built-in spring is pre-pressed, namely the spring elasticity is controlled by adjusting the compression amount of the spring, and the energy harvesting frequency of the piezoelectric ceramics is indirectly controlled, so that the energy harvester can work more efficiently and more stably in different environments.

The annular array type piezoelectric energy harvester with adjustable pre-pressing comprises an outer shell, a lower end cover, a cover plate, a piezoelectric energy harvesting component, an energy harvesting control component, a pre-pressing adjustable device and the like. The piezoelectric energy harvesting component comprises an upper liner, a lower liner, a piezoelectric ceramic piece and an elastic buffer block; the energy harvesting control assembly comprises a piston, a main push rod, an O-shaped ring, a Glare ring, a spline, an upper push disc, a contact bolt, an elastic contact, a contact push rod and the like; the pre-pressing adjustable device comprises a spring, a lower push disc, a pre-tightening seat, a pre-tightening knob and the like.

The outer shell is a cylindrical shell, the inner part of the outer shell comprises a pressure cavity and a piezoelectric cavity, and external threads are arranged outside the pressure cavity and used for connecting an external pipeline system; six threaded holes are formed in the side of the piezoelectric cavity and used for being in threaded connection with a bolt to fix the lower end cover. The lower end cover is cylindrical, six blind holes are formed in the edge of the lower end cover and used for fixing bolts, a prepressing adjustable device fixing hole is formed in the middle of the lower end cover, internal threads and a rectangular groove are formed in the hole, the internal threads are used for being connected with a prepressing seat of the prepressing adjustable device, and the rectangular groove is used for limiting that the lower push disc can only slide up and down; a plurality of circular piezoelectric energy harvesting component fixing grooves are arranged around the middle shaft linear array of the lower end cover and used for placing the piezoelectric energy harvesting components.

The upper lining and the lower lining in the piezoelectric energy capturing component are both made of annular insulating materials with different cross-sectional shapes, and the elastic buffer block is made of cylindrical rubber materials. When the energy harvester works, the elastic contact contacts the piezoelectric sheet to deform to generate electric energy, and when the pressure of fluid in a pipeline system is overlarge, the elastic buffer block can play a buffer role; when the piezoelectric plate is deformed and reduced, the elastic buffer block can play a good promoting role.

The energy capture control assembly works through flow-induced vibration and spring force generated by flowing of the fluid medium. The piston is placed in the pressure cavity of the outer shell and sealed by the O-shaped ring and the Glare ring, and when the working medium is liquid, the damage of the piezoelectric element caused by the fact that the fluid enters the piezoelectric cavity can be effectively avoided.

The push-up disc, the elastic contact and the contact push rod are placed in a piezoelectric cavity of the outer shell, wherein the push-up disc is in a disc shape, a cylindrical fixing hole is formed in the middle of the push-up disc, and a plurality of countersunk head orifices are arrayed at the edge of the push-up disc and used for placing contact bolts to fix the contact push rod; the elastic contacts are made of soft materials and have the effect that the piezoelectric sheets deform after contacting the piezoelectric sheets, the number of the countersunk holes of the upper push disc, the number of the contact bolts, the number of the contact push rods and the number of the elastic contacts are all consistent with the number of the circular piezoelectric energy capturing assembly fixing grooves of the lower end cover, and the central axes of each group of the contact bolts, the contact push rods and the elastic contacts are all superposed with the central axes of the corresponding circular piezoelectric energy capturing assembly fixing grooves.

The piston is connected with the push-up disc through the main push rod, the spline is arranged between the outer shell and the main push rod, and the spline has the function of preventing the central axes of the contact bolt, the contact push rod and the elastic contact from deviating from the central axis of the circular piezoelectric energy capturing component fixing groove of the lower end cover when the main push rod slides up and down, so that the deformation effect of the piezoelectric plate is guaranteed to the maximum extent.

The placing sequence of each element in the pre-pressing adjustable device is sequentially a spring, a lower pushing disc, a pre-tightening knob and a pre-tightening seat from top to bottom. The spring is a common compression spring, the middle of the lower push disc is made of cylindrical steel materials and is provided with a threaded hole, and six rectangular limiting bulges are processed at the edge part and matched with six rectangular grooves on the lower base to jointly complete the up-and-down sliding of the lower push disc.

The lower push plate and the pre-tightening knob are in threaded connection, the lower push plate is in contact with the pre-tightening seat initially, the spring is slightly compressed at the moment, the upper push plate is jacked up to jack the whole energy harvesting control assembly, the lower push plate slides upwards under the action of the threads along with the rotation of the pre-tightening knob, so that the spring is compressed, and after the lower push plate is in contact with the cover plate, the lower push plate cannot slide upwards any more, and the spring pre-tightening is the largest at the moment.

Compared with the prior art, the utility model can bring the following beneficial effects:

(1) the utility model collects the energy generated by flow-induced vibration in the hydraulic and pneumatic system pipelines by utilizing a piezoelectric energy harvesting technology, and is used for driving low-power-consumption elements in the hydraulic and pneumatic system or converting the low-power-consumption elements into electric energy for storage.

(2) In order to increase the power generation amount, the utility model adopts a plurality of piezoelectric ceramic sheets in an annular array to generate power so as to increase the power generation amount and improve the energy collection efficiency.

(3) Through adopting initiative adjustment spring compression, make the spring carry out the pre-compaction, piezoelectricity energy accumulator can work under different work condition, has solved the unicity of traditional piezoelectricity energy accumulator function.

Drawings

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

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

FIG. 3 is a cross-sectional view of section A-A of FIG. 1;

FIG. 4 is a schematic structural view of the outer housing;

FIG. 5 is a schematic structural view of the main push rod;

FIG. 6 is a schematic structural view of the push-up tray;

FIG. 7 is a schematic structural view of a contact pusher;

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

FIG. 9 is a schematic structural view of the push down tray;

FIG. 10 is a schematic view of the pre-tightening knob;

FIG. 11 is a schematic view of the pre-tightening socket;

FIG. 12 is an operational view of a pressure cavity with minimal spring preload when no pressure is present;

FIG. 13 is an operational schematic of maximum spring preload when the pressure cavity is pressurized.

The above figures are labeled as: 1. an outer housing; 2. a piston; 3. a main push rod; 4. an O-shaped ring; 5. a Glare circle; 6. pushing up the disc; 7. a contact bolt; 8. a contact push rod; 9. an elastic contact; 10. a cover plate; 11. a housing bolt; 12. a lower end cover; 13. downward pushing the disc; 14. pre-tightening the knob; 15. pre-tightening the base; 16. a spring; 17. a lower liner; 18. a piezoelectric sheet; 19. an elastic buffer block; 20. an upper liner; 21. a spline; 22. a wire; 23. a wire hole; 24. a cover plate bolt; 25. a nut; 1.1, 3.1, 3.3, 14.2 external threads; 1.2, a pressure cavity; 1.3, spline limiting ports; 1.4, a threaded hole; 1.5, a piezoelectric cavity; 1.6, pushing up the contact surface of the disc; 3.2, spline fixing grooves; 3.4 the lower bottom surface of the main push rod; 6.1, 13.2, spring fixing groove; 6.2, a countersunk hole opening; 6.3, a main push rod limiting port; 6.4, pushing up the upper bottom surface of the disc; 8.1, 12.3, 13.3, internal threads; 8.2, anti-skid bulges; 12.1, piezoelectric fixing grooves; 12.2, pushing down the limiting groove of the tray; 12.4, through holes; 13.1, limiting bulges; 14.1, pre-tightening the upper bottom surface of the knob; 14.3, 14.5, pre-tightening the knob limiting surface; 14.4, a manual knob; 15.1, outer hexagonal plane; 15.2, 15.3, pre-tightening the groove surface of the limiting groove; 15.4, pre-tightening the upper bottom surface of the seat.

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, 2 and 3 show an embodiment of the present invention, which includes an outer housing 1, a piston 2, a main push rod 3, an O-ring 4, a gley ring 5, an upward push disk 6, a contact bolt 7, a contact push rod 8, an elastic contact 9, a cover plate 10, a housing bolt 11, a lower end cover 12, a downward push disk 13, a pre-tightening knob 14, a pre-tightening seat 15, a spring 16, a lower liner 17, a piezoelectric plate 18, an elastic buffer block 19, an upper liner 20, a spline 21, a lead wire 22, a lead hole 23, a cover plate bolt 24 and a nut 25. In the embodiment, a six-piezoelectric-sheet annular array arrangement structure is adopted, and the number of the circular piezoelectric energy capturing assembly fixing groove, the upper push disc countersunk head hole, the contact bolt, the contact push rod and the elastic contact on the lower end cover is six.

As shown in fig. 4, the outer shell 1 includes a pressure cavity 1.2 and a piezoelectric cavity 1.5 therein, and an external thread 1.1 is arranged outside the pressure cavity 1.2 for connecting an external pipeline system; six threaded holes 1.4 are formed in the side of a piezoelectric cavity 1.5 on the outer shell 1 and used for fixing the lower end cover 12. The structure of the lower end cover 12 is shown in fig. 8, six through holes 12.4 are formed in the edge of the lower end cover for fixing bolts 11, a fixing hole of the pre-pressing adjustable device is formed in the middle of the lower end cover, internal threads 12.3 and six rectangular grooves 12.2 are formed in the inner portion of the through hole, the internal threads 12.3 are used for being connected with external threads 15.5 of a pre-tightening seat 15 of the pre-pressing adjustable device, and the structure of the pre-tightening seat is shown in fig. 11; the rectangular groove 12.2 is used for limiting the 13.1 part of the lower push disc 13 to only slide up and down, the structure of the lower push disc is shown in fig. 9, the spring fixing groove 13.2 is used for limiting the spring, and the internal thread 13.3 is connected with the external thread 14.2 on the pre-tightening knob 14 in a screwing mode; the piezoelectric fixing groove 12.1 of the lower end cover 12 is used for placing a piezoelectric energy harvesting component.

In the piezoelectric energy harvesting assembly, an upper liner 20 and a lower liner 17 enclose a piezoelectric patch 18 therein, and an elastic buffer block 19 is placed below the piezoelectric patch 18. When the piezoelectric energy harvester works, the elastic contact 9 is contacted with the piezoelectric sheet 20 to deform to generate electric energy, and when the pressure of fluid in a pipeline system is overlarge, the elastic buffer block 19 can play a buffer role; the elastic buffer block 19 also functions well when the piezoelectric sheet 20 is deformed and reduced.

The piston 2 is placed in the pressure cavity 1.2 of the outer shell 1 and sealed by the O-shaped ring 4 and the Glare ring 5, and when the working medium is liquid, the damage of the piezoelectric element caused by the fact that the fluid enters the piezoelectric cavity 1.5 can be effectively avoided; the push-up disk 6, the elastic contact 9 and the contact push rod 8 are placed in a piezoelectric cavity 1.5 of the outer shell 1, wherein the middle of the push-up disk 6 is provided with a cylindrical fixed hole, and six countersunk head orifices 6.2 are arrayed at the edge; the piston 2 and the push-up disc 6 are in threaded connection through the main push rod 3, the structure of the main push rod 3 is shown in fig. 5, the structure of the push-up disc 6 is shown in fig. 6, the external thread 3.1 in fig. 5 is used for connecting the piston 8, the external thread 3.4 is used for screwing the nut 25 to fix the push-up disc 6, a rectangular bulge is arranged in front of the spline fixing groove 3.2 and the external thread 3.3 of the main push rod 3 and used for being matched with the main push rod limiting opening 6.3 of the push-up disc 6 to prevent the push-up disc from rotating.

The spline 21 is arranged in the spline fixing groove 3.2 of the main push rod 3 and is in contact with the 1.3 position of the outer shell 1, and the function of the spline is to prevent the main push rod 3 from rotating and drive the push-up disc 6 to rotate, so that the position of the elastic contact 9 is prevented from being biased, and the deformation effect of the piezoelectric sheet 18 is further ensured to the maximum extent. The elastic contact 9 is connected with the push-up plate 6 through a contact push rod 8, the structural schematic diagram of the contact push rod is shown in fig. 7, wherein an internal thread 8.1 and a contact bolt 7 are assembled and fixed at a countersunk head hole 6.2 of the push-up plate 6, and the anti-skid protrusion 8.2 is used for fixing the elastic contact 9.

Still further, in the preload adjustable device, the connection between the pushing disc 13 and the preload knob 14 is a screwed connection of an internal thread 13.3 and an external thread 14.2, and the preload knob and the preload seat are in surface contact through preload knob limiting surfaces 14.3 and 14.5 in fig. 10 and preload limiting groove surfaces 15.2 and 15.3 in fig. 11. The pre-tightening knob 14 is structured as shown in fig. 10, because the push-down plate 13 can only slide up and down under the action of the limit protrusion 13.1 and the push-down plate limit groove 12.2, when the manual knob 14.4 on the pre-tightening knob 14 is rotated clockwise, the push-down plate 13 can only move up, and when the manual knob 14.4 on the pre-tightening knob 14 is rotated counterclockwise, the push-down plate 13 can only move down. At the beginning of pre-pressing adjustment, as shown in fig. 12, the lower push plate 13 contacts with the upper bottom surface 15.4 of the pre-tightening seat 15, at this time, the spring 16 is slightly compressed, the upper push plate 6 is jacked up by the spring 16 to jack up the whole energy capture control assembly, the lower push plate 13 slides upwards along with the rotation of the pre-tightening knob 14, so that the spring 16 is compressed, after the lower push plate 13 contacts with the cover plate 10, i.e. as shown in fig. 13, the lower push plate 13 cannot slide upwards any more, at this time, the pre-pressing of the spring 16 is maximum.

The working principle of the piezoelectric energy harvester is as follows: when pressure exists in the pressure cavity 1.2 of the outer shell 1, the pressure in the cavity 1.2 is always larger than the elastic force of the spring 16, so that the energy capture control assembly moves downwards, the elastic contact 9 of the energy capture control assembly is contacted with the piezoelectric plate 18, the piezoelectric plate 18 is further deformed, and when the energy capture control assembly moves downwards until the lower bottom surface 3.4 of the main push rod 3 is contacted with the upper bottom surface 14.1 of the pre-tightening knob 14, the pre-tightening knob 14 props the energy capture control assembly; due to the flow-induced vibration effect of fluid media in the pressure cavity 1.2 and the upward elastic force of the spring 16, the energy capture control assembly continuously slides up and down, so that the piezoelectric sheet 18 continuously deforms, electric energy is continuously generated, and the generated electric energy is stored through the lead 22 or directly drives low-power-consumption elements.

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 utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.

Claims (3)

1. The utility model provides a piezoelectric energy harvester of annular array pre-compaction adjustable which characterized in that: the piezoelectric energy harvesting device comprises an outer shell, a cover plate, a shell bolt, a lower end cover, a lead, a cover plate bolt, a nut, a piezoelectric energy harvesting component, an energy harvesting control component and a prepressing adjustable device, wherein the piezoelectric energy harvesting component comprises an upper lining, a lower lining, a piezoelectric ceramic piece and an elastic buffer block; the energy harvesting control assembly comprises a piston, a main push rod, an O-shaped ring, a Glare ring, a spline, an upper push disc, a contact bolt, an elastic contact and a contact push rod; the pre-pressing adjustable device comprises a spring, a lower push disc, a pre-tightening seat and a pre-tightening knob; the outer shell is a cylindrical shell, the interior of the outer shell comprises a pressure cavity and a piezoelectric cavity, and external threads are arranged on the outer part of the pressure cavity side and used for connecting an external pipeline system; in the piezoelectric energy harvesting component, an upper liner and a lower liner surround a piezoelectric ceramic piece, and an elastic buffer block is arranged below the piezoelectric ceramic piece; a piston in the energy capture control assembly is placed in a pressure cavity of an outer shell and sealed by an O-shaped ring and a Glare ring, a push-up disc, an elastic contact and a contact push rod are placed in a piezoelectric cavity of the outer shell, wherein the push-up disc is in a disc shape, a cylindrical fixing hole is formed in the middle of the push-up disc, six countersunk head orifices in an edge array are used for placing contact bolts to fix the contact push rod, the elastic contact is made of soft materials and is placed on the contact push rod, a semicircular anti-skidding bulge is arranged in a cylindrical groove at the contact end of the contact push rod, the piston is connected with the push-up disc through a main push rod, and a spline is placed between the outer shell and the main push rod to prevent the main push rod from rotating; the placing sequence of each element in the pre-pressing adjustable device is sequentially a spring, a lower push disc, a pre-tightening knob and a pre-tightening seat from top to bottom, the lower push disc and the pre-tightening knob are in threaded connection, and the pre-tightening knob and the pre-tightening seat are in surface contact through a pre-tightening knob limiting surface and a pre-tightening limiting groove surface.

2. The annular array type pre-pressure adjustable piezoelectric energy harvester of claim 1, wherein: the piezoelectric energy harvesting device is characterized in that six threaded holes are formed in the side of the piezoelectric cavity and used for assembling a lower end cover, the lower end cover is cylindrical, six blind holes are formed in the edge of the lower end cover and used for fixing bolts, a fixing hole of a prepressing adjustable device is formed in the middle of the lower end cover, internal threads and six rectangular grooves are formed in the inner portion of the hole, six piezoelectric fixing grooves are arranged around a linear array of a middle shaft of the lower end cover and used for placing six piezoelectric energy harvesting assemblies.

3. The annular array type pre-pressure adjustable piezoelectric energy harvester of claim 1, wherein: the upper lining and the lower lining in the piezoelectric energy capturing component are both made of annular insulating materials with different cross-sectional shapes, and the elastic buffer block is made of cylindrical rubber materials.

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