CN211429213U - Roller type generator, friction roller type generator and piezoelectric roller type generator - Google Patents
Roller type generator, friction roller type generator and piezoelectric roller type generator Download PDFInfo
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- CN211429213U CN211429213U CN202020132625.4U CN202020132625U CN211429213U CN 211429213 U CN211429213 U CN 211429213U CN 202020132625 U CN202020132625 U CN 202020132625U CN 211429213 U CN211429213 U CN 211429213U
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Abstract
The utility model provides a drum type generator, include: the conveyor belt (7) and the friction layer (2) are wound on the at least two rollers (6), and the friction layer (2) is arranged between the conveyor belt (7) and the at least two rollers (6); the surface of the conveyor belt (7) back to the at least two rollers (6) is sequentially provided with the substrate (5) and the piezoelectric film (1) in a contact manner; a first electrode (3) is arranged on the surface of the conveyor belt (7) facing the at least two rollers, and the first electrode (3) is arranged between the conveyor belt (7) and the friction layer (2); a second electrode (4) is arranged on the surface of the friction layer (2) facing the at least two rollers (6); the piezoelectric film (1) forms a piezoelectric power generation part; the friction layer (2) and the conveyor belt (7) form a friction power generation part. Through the utility model provides a roller type generator can reduce the contact wear that sliding friction produced, has improved the life of generator.
Description
Technical Field
The utility model relates to a polytetrafluoroethylene electret and poly-L-lactic acid piezoelectric film, concretely relates to drum type generator.
Background
Polylactic acid (PLA) has biodegradability, excellent thermoplasticity, and high mechanical strength. Therefore, the polylactic acid is widely applied to the fields of clothes, textile, food packaging, medical treatment and the like. Synthetic polylactic acid can be classified into levorotatory polylactic acid (PLLA), dextrorotatory polylactic acid (PDLA), racemic polylactic acid (PDLLA), and meso-polylactic acid (meso-PLA). Wherein, the long chain of the poly-L-lactic acid molecule tends to be arranged in a helical structure because the polymeric unit of the poly-L-lactic acid has a chiral center. The spatial structure of the poly-L-lactic acid molecular chain is a right-handed helix structure, and the spatial structure of the poly-D-lactic acid molecular chain is a left-handed helix structure.
When the polylactic acid molecular chain is subjected to a tangential stress of 45 degrees with the direction of the molecular chain rotating shaft, the helical structure space has chiral asymmetry. Due to the polarity of the carbon-oxygen double bond (C ═ O) and the 120 ° angle with the helix structure, the dipoles in the direction perpendicular to the helix chain will cancel each other out, and a horizontal dipole component will be generated. The phase change of the dipole component under the electric field causes the poly-L-lactic acid material to generate shear deformation. The spiral structure of the polylactic acid molecular chain also determines another characteristic different from the piezoelectric polymer such as PVDF, namely the polylactic acid material with piezoelectric property can be obtained only by stretching treatment. The friction generator widely used at present can cause the abrasion of the contact layer due to the sliding friction, and further the service life of the generator is reduced.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides a pair of drum type generator is used for solving piezoelectric film preparation technology complicacy at least, and the contact layer wearing and tearing scheduling problem that sliding friction leads to.
(II) technical scheme
The utility model provides a drum type generator, include: the piezoelectric film comprises a piezoelectric film 1, a friction layer 2, a first electrode 3, a second electrode 4, a substrate 5, at least two rollers 6 and a conveyor belt 7; the conveyor belt 7 and the friction layer 2 are wound on the at least two rollers 6, and the friction layer 2 is arranged between the conveyor belt 7 and the at least two rollers 6; the surface of the conveyor belt 7 back to the at least two rollers 6 is sequentially provided with the substrate 5 and the piezoelectric film 1 in a contact manner; the surface of the conveyor belt 7 facing the at least two rollers is provided with a first electrode 3, and the first electrode 3 is arranged between the conveyor belt 7 and the friction layer 2; the surface of the friction layer 2 facing the at least two rollers 6 is provided with a second electrode 4; the piezoelectric film 1 constitutes a piezoelectric power generating portion; the friction layer 2 and the conveyor belt 7 constitute a friction power generating portion.
Optionally, the piezoelectric film 1 is a flexible bendable material.
Alternatively, the thickness of the piezoelectric film 1 is in the range of 5 μm to 20 μm.
Optionally, the friction layer 2 is an electret film; the surface of the electret film is made into a nanostructure by plasma cleaning to increase the surface area, and also charge resides by high-voltage arc polarization.
Optionally, the distance between two adjacent first electrodes 3 is half the circumference of the drum 6.
Optionally, the length of the first electrode 3 is one half of the circumference of the drum 6.
Optionally, the distance between the axes of two adjacent rollers 6 is half of the circumference of the roller 6.
Optionally, the generator further comprises: a bearing 8 and a bearing holder 9; the roller 6 is fixed to a bearing frame 9 by a bearing 8.
Optionally, the number of rollers 6 is at least two.
The utility model also provides a friction roller type generator, include: a friction layer 2, a first electrode 3, a second electrode 4, at least two rollers 6 and a conveyor belt 7; the conveyor belt 7 and the friction layer 2 are wound on the at least two rollers 6, and the friction layer 2 is arranged between the conveyor belt 7 and the at least two rollers 6; the first electrode 3 is arranged on the conveyor belt 7 and is also arranged between the conveyor belt 7 and the friction layer 2; the second electrode 4 is disposed on the friction layer 2 and is also disposed between the friction layer 2 and the at least two rollers 6.
The utility model discloses still provide a piezoelectricity cylinder type generator in addition, include: a piezoelectric film 1, a substrate 5, at least two rollers 6, and a conveyor belt 7; the conveyor belt 7 is wound on at least two rollers 6; the surface of the conveyor belt 7 facing away from the at least two rollers 6 is in contact with the substrate 5 and the piezoelectric film 1 in this order.
(III) advantageous effects
1. Through the utility model provides a drum type generator generates piezoelectric induction current through the state replacement of the bending and straightening of the piezoelectric film;
2. through the utility model provides a set up first electrode on the conveyer belt and frictional layer area of contact's change production friction induced-current to the contact loss who produces when having avoided sliding friction to generate electricity.
Drawings
Fig. 1 schematically shows a structural view of a friction-piezoelectric coupled drum type generator according to an embodiment of the present invention;
fig. 2 schematically shows a structure view of a friction roller type generator according to an embodiment of the present invention;
fig. 3 schematically shows a structural view of a piezoelectric drum type generator according to an embodiment of the present invention;
fig. 4 (a) schematically shows a current signal diagram generated by a piezoelectric film in a piezoelectric roller generator according to an embodiment of the present invention, (b) in fig. 4 schematically shows a current signal diagram generated by friction power generation in a friction roller generator according to an embodiment of the present invention, and (c) in fig. 4 schematically shows a current signal diagram generated by a friction-piezoelectric coupled roller generator according to an embodiment of the present invention;
fig. 5 (a) schematically shows a voltage signal diagram of a piezoelectric roller generator according to an embodiment of the present invention, (b) in fig. 5 schematically shows a current signal diagram of a piezoelectric roller generator according to an embodiment of the present invention, (c) in fig. 5 schematically shows a voltage signal diagram of a friction roller generator according to an embodiment of the present invention, and (d) in fig. 5 schematically shows a current signal diagram of a friction roller generator according to an embodiment of the present invention.
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 detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 schematically shows a structural view of a drum type generator according to an embodiment of the present invention. Among them, fig. 1 shows a friction-piezoelectric coupled drum type generator. The friction-piezoelectric coupled drum type generator includes: the piezoelectric film comprises a piezoelectric film 1, a friction layer 2, a first electrode 3, a second electrode 4, a substrate 5, at least two rollers 6 and a conveyor belt 7; the conveyor belt 7 and the friction layer 2 are wound on the at least two rollers 6, and the friction layer 2 is arranged between the conveyor belt 7 and the at least two rollers 6; the surface of the conveyor belt 7 back to the at least two rollers 6 is sequentially provided with the substrate 5 and the piezoelectric film 1 in a contact manner; the surface of the conveyor belt 7 facing the at least two rollers is provided with a first electrode 3, and the first electrode 3 is arranged between the conveyor belt 7 and the friction layer 2; the surface of the friction layer 2 facing the at least two rollers 6 is provided with a second electrode 4; the piezoelectric film 1 constitutes a piezoelectric power generating portion; the friction layer 2 and the conveyor belt 7 form a friction power generation part; moreover, the generator in fig. 1 further comprises a bearing 8 and a bearing frame 9; the roller 6 is fixed to a bearing frame 9 by a bearing 8.
The working principle of the friction-piezoelectric coupling roller type generator is as follows: the rolling 6 drives the conveyor belt 7 to rotate, and in the rotating process of the conveyor belt 7, the contact area between the first electrode 3 arranged on the conveyor belt 7 and the friction layer 2 is changed, and then the first electrode 4 is combined to generate induced current. The principle of induced current generation is described below:
the friction layer 2 is an electret film, and the material of the electret film may be Polytetrafluoroethylene (PTFE), fluorine-containing rubber, and Polydimethylsiloxane (PDMS), for example; the thickness of the electret film may be, for example, 10 to 200 μm; and the surface of the electret membrane is increased by manufacturing a nano structure through plasma cleaning, and friction induced charges are increased by polarizing the resident charges through a high-voltage arc, so that the friction power generation efficiency is improved. Moreover, the distance between two adjacent first electrodes 3 is half of the circumference of the roller, the length of the first electrode 3 is half of the circumference of the roller 6, and the distance between the axes of two adjacent rollers 6 is half of the circumference of the roller, so that when the transmission belt 7 rotates, the contact area between the first electrode 3 arranged on the transmission belt 7 and the friction layer 2 changes, and further induced current is generated, and the purpose of collecting the induced current through a circuit is achieved.
Meanwhile, the piezoelectric film 1 passes through the roller 6 when rotating along with the conveyor belt 7, and the piezoelectric film 1 in the embodiment of the utility model is made of flexible bendable material, so that the piezoelectric film 1 can be bent and straightened along with the rotation of the roller 6; the material of the piezoelectric film 1 in the embodiment of the present invention may be, for example, poly-l-lactic acid (PLLA), and the PLLA is selected so that when a PLLA molecular chain receives a tangential stress of 45 ° with respect to a molecular chain rotation axis, two factors, i.e., a polarity of a carbon-oxygen double bond (C ═ O) in the molecular chain and a 120 ° included angle of a helical structure in the molecular chain, may cause dipoles to cancel each other in a direction perpendicular to the helical chain, and then a horizontal dipole component is generated. The phase change of this dipole component under the electric field causes the PLLA material to deform in shear. The PLLA molecular chain can have piezoelectric performance through deformation generated by bending or stretching actions and the like, and induced charges are further generated. Furthermore, the PLLA piezoelectric coefficient d in the embodiment of the present invention14For 10.1pC/N, the piezoelectric coefficient of the PLLA piezoelectric film obtained through uniaxial tension is far less than that of lead zirconate titanate piezoelectric ceramics, and the piezoelectric coefficient of PVDF is less than 25pC/N, the embodiment of the present invention provides a PLLA piezoelectric coefficient even less than that of piezoelectric polymer polyvinylidene fluoride (PVDF), and the smaller piezoelectric coefficient makes the PLLA have higher piezoelectric performance; and the preparation process of PLLA is simpler than that of PVDF and piezoelectric ceramics, and the piezoelectric film 1 with piezoelectric effect can be obtained without high-voltage electric field polarization treatment, so that the PLLA is used as the piezoelectric film to bring a foundation for large-scale industrial production and commercial application of the poly-L-lactic acid process.
The piezoelectric film 1 in the embodiment of the present invention may also be made of, for example, poly (d-lactic acid), polyvinylidene fluoride, and electron beam irradiation copolymer (P (VDF-TrFE)). The embodiment of the utility model provides an in piezoelectric film 1's thickness scope be 5 mu m-20 mu m, and this thickness can make this piezoelectric film be applied to the utility model provides an in the embodiment later piezoelectric performance be in the highest state.
The utility model discloses the quantity of cylinder 6 of drum generator in the embodiment for example can be at least two for this drum generator's generating performance can increase the power generation unit or reduce the power generation unit along with actual application demand, and then reach the highest practical efficiency.
The material of the substrate 5 in the embodiment of the present invention may be, for example, polyethylene glycol terephthalate (PET), Polyimide (PI), or urethane (PU).
As explained above, the conveyor belt 7 is rotated by the rollers 6, and during the rotation of the conveyor belt 7, the contact area between the first electrode 3 disposed on the conveyor belt 7 and the friction layer 2 is changed, and then the second electrode 4 is combined to generate an induced current. Therefore, the embodiment of the present invention further provides a friction roller type generator, referring to fig. 2, fig. 2 schematically shows a structure diagram of the friction roller type generator in the embodiment of the present invention.
Referring to fig. 2, the friction roller generator according to the embodiment of the present invention includes: a friction layer 2, a first electrode 3, a second electrode 4, at least two rollers 6 and a conveyor belt 7; the conveyor belt 7 and the friction layer 2 are wound on the at least two rollers 6, and the friction layer 2 is arranged between the conveyor belt 7 and the at least two rollers 6; the first electrode 3 is arranged on the conveyor belt 7 and is also arranged between the conveyor belt 7 and the friction layer 2; the second electrode 4 is arranged on the friction layer 2 and is also arranged between the friction layer 2 and the at least two rollers 6; the roller 6 is fixed to a bearing frame 9 by a bearing 8. The embodiment of the utility model provides an in the electricity generation principle of friction roller type generator the same with the friction electricity generation principle among the above-mentioned friction-piezoelectricity coupling roller type generator, no longer give consideration to here.
It has been clarified above that the piezoelectric film 1 can be deformed in bending and straightening along with the rotation of the roller 6, so as to generate induced charges, and therefore, the embodiment of the present invention further provides a piezoelectric roller type generator. Referring to fig. 3, fig. 3 schematically shows a structure diagram of a piezoelectric roller type generator according to an embodiment of the present invention.
Referring to fig. 3, the piezoelectric drum type generator according to the embodiment of the present invention includes: a piezoelectric film 1, a substrate 5, at least two rollers 6, and a conveyor belt 7; the conveyor belt 7 is wound on at least two rollers 6; the surface of the conveyor belt 7 facing away from the at least two rollers 6 is in contact with the substrate 5 and the piezoelectric film 1 in this order. The piezoelectric roller type generator further includes a bearing 8 and a bearing frame 9, wherein the roller 6 is fixed on the bearing frame 9 through the bearing 8. The embodiment of the utility model provides an in piezoelectricity drum type generator's piezoelectricity electricity generation principle is the same with the piezoelectricity electricity generation principle among the above-mentioned friction-piezoelectricity coupling drum type generator, no longer gives unnecessary details here.
Referring to fig. 4, (a) in fig. 4 schematically shows a current signal diagram generated by a piezoelectric film in a piezoelectric roller generator according to an embodiment of the present invention, (b) in fig. 4 schematically shows a current signal diagram generated by friction power generation in a friction roller generator according to an embodiment of the present invention, and (c) in fig. 4 schematically shows a current signal diagram generated by a friction-piezoelectric coupled roller generator according to an embodiment of the present invention; the current signals in fig. 4 (a), (b), and (c) are all current signals with a rectifier bridge inserted therein. In the current signal added to the rectifier bridge in (a) of fig. 4, the current signal is converted from an alternating current signal to a direct current signal under the action of the rectifier bridge; as can be seen from fig. 4 (a), the piezoelectric film 1 generates a dc current of about 8 microamperes, as can be seen from fig. 4 (b), a dc current of about 3 microamperes can be generated by friction, and as can be seen from fig. 4 (c), a dc current of about 11 microamperes can be generated by friction-piezoelectric coupling.
Referring to fig. 5, (a) in fig. 5 schematically shows a voltage signal diagram of a piezoelectric roller generator according to an embodiment of the present invention, (b) in fig. 5 schematically shows a current signal diagram of a piezoelectric roller generator according to an embodiment of the present invention, (c) in fig. 5 schematically shows a voltage signal diagram of a friction roller generator according to an embodiment of the present invention, and (d) in fig. 5 schematically shows a current signal diagram of a friction roller generator according to an embodiment of the present invention. As can be seen from (a) in fig. 5, when the piezoelectric film 1 is a PLLA material, the voltage signal generated by the piezoelectric roller generator is about 30V; as can be seen from (b) in fig. 5, the current signal generated by the PLLA piezoelectric film is about 10 microamperes; as can be seen from (c) of fig. 5, the friction drum type generator generates a voltage signal of about 100V; it can be seen from (d) in fig. 5 that the PLLA piezoelectric film generates a current signal of about 4 microamperes.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A drum type generator, comprising: the device comprises a piezoelectric film (1), a friction layer (2), a first electrode (3), a second electrode (4), a substrate (5), at least two rollers (6) and a conveyor belt (7);
the conveyor belt (7) and the friction layer (2) are wound on the at least two rollers (6), and the friction layer (2) is arranged between the conveyor belt (7) and the at least two rollers (6);
the surface of the conveyor belt (7) back to the at least two rollers (6) is sequentially provided with the substrate (5) and the piezoelectric film (1) in a contact manner; a first electrode (3) is arranged on the surface of the conveyor belt (7) facing the at least two rollers, and the first electrode (3) is arranged between the conveyor belt (7) and the friction layer (2);
a second electrode (4) is arranged on the surface of the friction layer (2) facing the at least two rollers (6);
the piezoelectric film (1) forms a piezoelectric power generation part; the friction layer (2) and the conveyor belt (7) form a friction power generation part.
2. Generator according to claim 1, characterised in that said piezoelectric film (1) is a flexible and bendable material.
3. Generator according to claim 1, characterised in that the thickness of the piezoelectric film (1) ranges from 5 μm to 20 μm.
4. Generator according to claim 1, characterised in that said friction layer (2) is an electret film; the surface of the electret film is plasma cleaned to prepare a nano structure to increase the surface area, and charges are also implanted through high-voltage arc polarization.
5. Generator according to claim 1, characterized in that two adjacent first electrodes (3) are at a distance of half the circumference of said drum (6).
6. Generator according to claim 1, characterized in that said first electrode (3) has a length of half the circumference of said drum (6).
7. Generator according to claim 1, characterized in that the distance between the axes of two adjacent rollers (6) is half the circumference of said rollers (6).
8. The generator of claim 1, further comprising: a bearing (8) and a bearing bracket (9);
the roller (6) is fixed on the bearing frame (9) through the bearing (8).
9. A friction roller type generator, comprising: a friction layer (2), a first electrode (3), a second electrode (4), at least two rollers (6) and a conveyor belt (7);
the conveyor belt (7) and the friction layer (2) are wound on the at least two rollers (6), and the friction layer (2) is arranged between the conveyor belt (7) and the at least two rollers (6);
the first electrode (3) is arranged on the conveyor belt (7) and is also arranged between the conveyor belt (7) and the friction layer (2); the second electrode (4) is arranged on the friction layer (2) and is also arranged between the friction layer (2) and the at least two rollers (6).
10. A piezoelectric roller type generator, comprising: a piezoelectric film (1), a substrate (5), at least two rollers (6) and a conveyor belt (7);
the conveyor belt (7) is wound on the at least two rollers (6);
the surface of the conveyor belt (7) facing away from the at least two rollers (6) is sequentially in contact with the substrate (5) and the piezoelectric film (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020132625.4U CN211429213U (en) | 2020-01-20 | 2020-01-20 | Roller type generator, friction roller type generator and piezoelectric roller type generator |
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| CN202020132625.4U CN211429213U (en) | 2020-01-20 | 2020-01-20 | Roller type generator, friction roller type generator and piezoelectric roller type generator |
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| CN211429213U true CN211429213U (en) | 2020-09-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114257119A (en) * | 2021-11-17 | 2022-03-29 | 煤炭科学研究总院 | Energy collecting device of belt conveyer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114257119A (en) * | 2021-11-17 | 2022-03-29 | 煤炭科学研究总院 | Energy collecting device of belt conveyer |
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