CN218570111U

CN218570111U - Vibration energy collecting device and wireless sensor

Info

Publication number: CN218570111U
Application number: CN202221557490.1U
Authority: CN
Inventors: 高帅; 孟力; 王飞彪; 刘志
Original assignee: Frequency Exploration Intelligent Technology Jiangsu Co ltd
Current assignee: Frequency Exploration Intelligent Technology Jiangsu Co ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2023-03-03
Anticipated expiration: 2032-06-21

Abstract

The utility model discloses a vibration energy collection system, include: a housing defining a receiving cavity therein; the interdigital electrode group is arranged on the inner wall of the shell and is of a tubular structure; and the floating sliding block is hung in the accommodating cavity, and during vibration, the floating sliding block reciprocates in the interdigital electrode group along the axial direction of the interdigital electrode group so as to rub the floating sliding block with the interdigital electrode group, thereby generating current. The utility model discloses simple structure utilizes equipment environment self vibration energy to drive slider and the production relative motion of interdigital electrode group, and through the friction electricity generation between slider and the interdigital electrode group that floats, for wireless sensor provides the electric energy, realized the self-power supply, need not to change the battery, satisfied the environmental protection requirement.

Description

Vibration energy collecting device and wireless sensor

Technical Field

The utility model belongs to the technical field of power generation facility, concretely relates to vibration energy collection system, wireless sensor.

Background

In the wireless sensor system, a sensor with sensing, storage, wireless communication and other functions is deployed in a target monitoring area, so that a preset sensing monitoring task is completed. At present, the traditional wireless sensor is powered by a battery, which brings many problems such as difficult battery replacement and environmental pollution.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model provides a vibration energy collection system, this vibration energy collection system have the advantage that utilizes vibration energy to supply power to wireless sensor.

According to the utility model discloses vibration energy collection system, include: a housing defining a receiving cavity therein; the interdigital electrode group is arranged on the inner wall of the shell and is of a tubular structure; the floating sliding block is hung in the accommodating cavity and reciprocates in the interdigital electrode group along the axis direction of the interdigital electrode group during vibration, so that the floating sliding block and the interdigital electrode group are rubbed to generate current.

According to the utility model discloses an embodiment, have the clearance between the outer peripheral face of the slider that floats and the interdigital electrode group, the clearance with the radial ratio of the slider that floats is 0.2% -0.4%.

According to the utility model discloses an embodiment, interdigital electrode group includes: the shell comprises a first interdigital electrode and a second interdigital electrode, wherein the first interdigital electrode and the second interdigital electrode are both arranged on the inner wall of the shell, and the interdigital of the second interdigital electrode and the interdigital of the first interdigital electrode are arranged in a staggered mode.

According to the utility model discloses an embodiment, a plurality of annular grooves have been seted up on the outer peripheral face of slider that floats, and is a plurality of the annular groove is followed the axis direction of slider that floats is evenly arranged, the width of annular groove equals the distance between two adjacent interdigital and the width sum of an interdigital, adjacent two distance between the annular groove equals the width of annular groove.

According to the utility model discloses an embodiment, the ladder hole has one on the casing, go up the downthehole first piezoelectric patches that is provided with of ladder, it is provided with first spring to hold the intracavity, first piezoelectric patches orientation one side of the slider that floats with the one end of first spring links to each other, the other end of first spring with the slider that floats links to each other.

According to the utility model discloses an embodiment, go up the ladder hole upper cover and be equipped with first closing cap, first closing cap is used for opening or closes go up the ladder hole.

According to the utility model discloses an embodiment, the shoulder hole has on the casing, be provided with the second piezoelectric patches in the shoulder hole down, it is provided with the second spring to hold the intracavity, the second piezoelectric patches orientation one side of the slider that floats with the one end of second spring links to each other, the other end of second spring with the slider that floats links to each other.

According to the utility model discloses an embodiment, lower shoulder hole upper cover is equipped with the second closing cap, the second closing cap is used for opening or closing lower shoulder hole.

According to the utility model discloses an embodiment, the diameter of first spring with the diameter of second spring all is less than the diameter of slider floats, the center pin of first spring the center pin of second spring with the center pin collineation of interdigital electrode group.

According to an embodiment of the present invention, a wireless sensor includes the vibration energy harvesting device described above.

The utility model has the advantages that the utility model has simple structure, the self vibration energy of the equipment environment is utilized to drive the floating slide block and the interdigital electrode group to generate relative motion, the electricity is generated through the friction between the floating slide block and the interdigital electrode group, the wireless sensor is provided with electric energy, the self-energy supply is realized, the battery is not required to be replaced, and the environmental protection requirement is satisfied; the utility model discloses a set up first piezoelectric patches and second piezoelectric patches, the pressure conversion that the slider that will float produced is the electric energy, combines together piezoelectricity effect and friction nanometer electricity generation effect, has improved the generating effect jointly.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments with reference to the accompanying drawings, in which:

fig. 1 is a schematic perspective view of a vibration energy harvesting device according to the present invention;

fig. 2 is a schematic view of a half-section structure of a vibration energy harvesting device according to the present invention;

fig. 3 is a schematic view of the working principle of the vibration energy harvesting device according to the present invention;

reference numerals:

the piezoelectric device comprises a first cover 10, a first piezoelectric sheet 20, a shell 30, a first spring 40, a first interdigital electrode 50, a floating slider 60, a second interdigital electrode 70, a second spring 80, a second piezoelectric sheet 90 and a second cover 100.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The vibration energy harvesting device according to the embodiment of the present invention is described in detail below with reference to the drawings.

As shown in fig. 1 to 3, the vibration energy collecting device according to the embodiment of the present invention includes: the device comprises a shell 30, an interdigital electrode group and a floating sliding block 60, wherein a containing cavity is defined in the shell 30; the interdigital electrode group is arranged on the inner wall of the shell 30 and is of a tubular structure; the floating slider 60 is hung in the accommodating cavity, and when vibrating, the floating slider 60 reciprocates in the direction of the axis of the interdigital electrode group in the interdigital electrode group, so that the floating slider 60 rubs against the interdigital electrode group, thereby generating current.

Further, a gap is formed between the outer peripheral surface of the floating sliding block 60 and the interdigital electrode group, and the ratio of the gap to the radius of the floating sliding block 60 is 0.2% -0.4%. That is, an excessively large gap between the outer peripheral surface of the floating slider 60 and the group of interdigital electrodes causes a reduction in power generation efficiency, and an excessively small gap causes difficulty in moving the floating slider 60.

According to the utility model discloses an embodiment, interdigital electrode group includes: the first interdigital electrode 50 and the second interdigital electrode 70, the first interdigital electrode 50 and the second interdigital electrode 70 are both disposed on the inner wall of the housing 30, and the interdigital of the second interdigital electrode 70 is staggered with the interdigital of the first interdigital electrode 50. In the embodiment, the casing 30 is a round tube, the first interdigital electrode 50 and the second interdigital electrode 70 are attached to the inner wall of the casing 30, the first interdigital electrode 50 and the second interdigital electrode 70 are located in the middle of the casing 30, and the first interdigital electrode 50 and the second interdigital electrode 70 are made of copper material.

Furthermore, a plurality of annular grooves are formed in the outer peripheral surface of the floating slider 60, the plurality of annular grooves are uniformly arranged along the axial direction of the floating slider 60, the width of each annular groove is equal to the sum of the distance between two adjacent fingers and the width of one finger, the distance between two adjacent annular grooves is equal to the width of each annular groove, that is, an annular protrusion is formed between two adjacent annular grooves, and the width of each annular protrusion is equal to the width of each annular groove. The floating slider 60 is made of dielectric material, preferably ceramic; the width of the annular grooves and the distance between two adjacent annular grooves are designed to be matched with the interdigital, so that the floating sliding block 60 can be timely switched between the adjacent interdigital when reciprocating, and the friction power generation efficiency is improved.

According to the utility model discloses an embodiment has an upper ladder hole on the casing 30, and upper ladder downthehole is provided with first piezoelectric patches 20, holds the intracavity and is provided with first spring 40, and first piezoelectric patches 20 links to each other with first spring 40's one end towards one side of slider 60 that floats, and first spring 40's the other end links to each other with slider 60 that floats. Preferably, the upper cover of the upper stepped hole is provided with a first cover 10, and the first cover 10 is used to open or close the upper stepped hole.

That is to say, the upper stepped hole at the upper end of the housing 30 can communicate the accommodating cavity with the outside of the housing 30, the stepped surface of the upper stepped hole can limit the first piezoelectric patch 20, and the first cover 10 is detachably connected to the housing 30, so as to facilitate the installation and the detachment of the first piezoelectric patch 20.

On the basis, the housing 30 has a lower stepped hole, a second piezoelectric plate 90 is disposed in the lower stepped hole, a second spring 80 is disposed in the accommodating chamber, one side of the second piezoelectric plate 90 facing the floating slider 60 is connected to one end of the second spring 80, and the other end of the second spring 80 is connected to the floating slider 60. Preferably, the lower stepped hole upper cover is provided with a second cover 100, and the second cover 100 is used to open or close the lower stepped hole. In this embodiment, the second spring 80, the second piezoelectric patch 90 and the second cover 100 have the same structure as the first spring 40, the first piezoelectric patch 20 and the first cover 10, and are symmetrical with respect to the floating slider 60.

The piezoelectric sheet can be made of light PVDF (polyvinylidene fluoride) and its copolymer (film), polypropylene (pp), etc., with good workability and wide frequency response.

Further, the diameter of the first spring 40 and the diameter of the second spring 60 are both smaller than the diameter of the floating slider 60. Further, the central axis of the first spring 40, the central axis of the second spring 60, and the central axis of the group of interdigitated electrodes are collinear. Design like this and avoided first spring 40 and second spring 60 and interdigital electrode group to produce the contact, when slider 60 floats upward movement in interdigital electrode group simultaneously, first piezoelectric patch 20 pressurized, second piezoelectric patch 90 are drawn, and slider 60 floats when downward movement in interdigital electrode group, first piezoelectric patch 20 is drawn, second piezoelectric patch 90 pressurized, makes the utility model discloses can effectively gather the vibration energy.

As shown in fig. 3, as the floating slider 60 moves up and down after receiving the vibration energy, the annular projection on the outer peripheral surface of the floating slider 60 gradually moves away from the first interdigital electrode 50 and approaches the second interdigital electrode 70. The negative charge on the surface of the floating slider 60 gradually accumulates a positive charge on the second interdigital electrode 70, and a transient current is formed between the adjacent two interdigital electrodes. Next, when the annular projection on the floating slider 60 is aligned with the finger on the second interdigital electrode 70, a new electrostatic balance is again formed, similar to the initial state. Subsequently, the floating slider 60 performs an opposite motion, thereby generating an opposite current. It is apparent that the direction of the current is periodically changed when the floating slider 60 repeatedly vibrates up and down, thereby generating an alternating current between the first interdigital electrode 50 and the second interdigital electrode 70.

The invention also discloses a wireless sensor which comprises the vibration energy collecting device. The wireless sensor is provided with a rectifying circuit, and the rectifying circuit is connected with the first interdigital electrode 50, the second interdigital electrode 70, the first piezoelectric patch 20 and the second piezoelectric patch 90, so that the electric energy converted by the vibration energy can be effectively utilized. The vibration energy collecting device can be arranged at a position with larger vibration, such as a bearing seat of equipment, a truss of a bridge and the like.

The utility model has the advantages that the utility model has simple structure, the self vibration energy of the equipment environment is utilized to drive the floating slide block 60 and the interdigital electrode group to generate relative motion, and electricity is generated through the friction between the floating slide block 60 and the interdigital electrode group, so as to provide electric energy for the wireless sensor, realize self-energy supply, avoid the need of replacing batteries and meet the requirement of environmental protection; the utility model discloses a set up first piezoelectric patches 20 and second piezoelectric patches 90, the pressure conversion that slider 60 produced floats is the electric energy, combines together piezoelectricity effect and friction nanometer electricity generation effect, has improved the generating effect jointly.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vibrational energy harvesting apparatus, comprising:

a housing (30), the housing (30) defining a receiving cavity therein;

the interdigital electrode group is arranged on the inner wall of the shell (30), and is of a tubular structure;

the floating sliding block (60) is hung in the accommodating cavity, and when the floating sliding block (60) vibrates, the floating sliding block (60) reciprocates in the interdigital electrode group along the axial direction of the interdigital electrode group, so that the floating sliding block (60) is rubbed with the interdigital electrode group, and current is generated.

2. A vibrational energy harvesting device according to claim 1, wherein a gap is provided between an outer peripheral surface of said floating slider (60) and said set of interdigital electrodes, and a ratio of said gap to a radius of said floating slider (60) is 0.2% -0.4%.

3. A vibration energy harvester according to claim 2, wherein the set of interdigitated electrodes comprises: the shell comprises a first interdigital electrode (50) and a second interdigital electrode (70), wherein the first interdigital electrode (50) and the second interdigital electrode (70) are arranged on the inner wall of the shell (30), and the interdigital of the second interdigital electrode (70) is arranged in a staggered mode with the interdigital of the first interdigital electrode (50).

4. A vibration energy harvesting device according to claim 3, wherein the peripheral surface of the floating slider (60) is provided with a plurality of annular grooves, the plurality of annular grooves are uniformly arranged along the axial direction of the floating slider (60), the width of each annular groove is equal to the sum of the distance between two adjacent fingers and the width of one finger, and the distance between two adjacent annular grooves is equal to the width of the annular groove.

5. A vibrational energy harvesting device according to claim 1, wherein said housing (30) has an upper stepped hole, a first piezoelectric plate (20) is disposed in said upper stepped hole, a first spring (40) is disposed in said accommodating chamber, one side of said first piezoelectric plate (20) facing said floating slider (60) is connected to one end of said first spring (40), and the other end of said first spring (40) is connected to said floating slider (60).

6. A vibration energy harvesting device according to claim 5, wherein the upper cover of the upper stepped hole is provided with a first cover (10), and the first cover (10) is used for opening or closing the upper stepped hole.

7. A vibrational energy harvesting device according to claim 5, characterized in that said housing (30) has a lower stepped hole, a second piezoelectric plate (90) is disposed in said lower stepped hole, a second spring (80) is disposed in said accommodating chamber, one side of said second piezoelectric plate (90) facing said floating slider (60) is connected to one end of said second spring (80), and the other end of said second spring (80) is connected to said floating slider (60).

8. A vibration energy harvesting device according to claim 7, wherein the lower stepped hole upper cover is provided with a second cover (100), the second cover (100) being used to open or close the lower stepped hole.

9. A vibration energy harvesting device according to claim 7, wherein the diameter of the first spring (40) and the diameter of the second spring (80) are both smaller than the diameter of the floating slider (60), and the central axes of the first spring (40), the second spring (80) and the group of interdigitated electrodes are collinear.

10. A wireless sensor comprising a vibrational energy harvesting device according to any one of claims 1-9.