CN112983865A - Multilayer full-symmetry bidirectional alternating-current balance driving piezoelectric fan - Google Patents
Multilayer full-symmetry bidirectional alternating-current balance driving piezoelectric fan Download PDFInfo
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- CN112983865A CN112983865A CN202110361408.1A CN202110361408A CN112983865A CN 112983865 A CN112983865 A CN 112983865A CN 202110361408 A CN202110361408 A CN 202110361408A CN 112983865 A CN112983865 A CN 112983865A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
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- Engineering & Computer Science (AREA)
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a multilayer full-symmetrical bidirectional alternating current balanced driving piezoelectric fan, which comprises a piezoelectric ceramic piece, high-strength fibers and a steel sheet, wherein the piezoelectric ceramic piece is made of a ceramic material; the piezoelectric ceramic piece has two pieces, two surfaces of the ceramic are polarized, one surface of the ceramic is a positive electrode, and the other surface of the ceramic is a negative electrode. Auxiliary electrodes are respectively adhered to the front surface and the back surface of the piezoelectric ceramic piece. After the auxiliary electrodes are adhered, high-strength fibers are respectively adhered to the negative electrode surfaces of the two ceramic sheets, and finally the adhered high-strength fibers are respectively adhered to the left side and the right side of the steel sheet, so that the high-strength fibers are mainly adhered to the steel sheet to form a composite electrode 0 of the piezoelectric fan taking the steel sheet as the center. The bidirectional alternating current balance drive is adopted, firstly, the voltage is slowly increased, so that the piezoelectric ceramics can avoid direct overvoltage impact and damage to the fragile piezoelectric ceramics; and secondly, double-path intermittent driving is adopted, so that the fatigue of the piezoelectric ceramic of single-path uninterrupted operation for a long time is avoided.
Description
Technical Field
The invention relates to the technical field of piezoelectric fans, in particular to a multilayer full-symmetric bidirectional alternating-current balanced driving piezoelectric fan.
Background
The main structural components of the piezoelectric fan comprise a piezoelectric fan and a driving power supply, and the working principle is that the piezoelectric property of piezoelectric ceramics is utilized, when external force is applied to the piezoelectric ceramics, the piezoelectric ceramics can generate charges and have the positive piezoelectric effect of the piezoelectric ceramics; conversely, when the piezoelectric ceramic is electrified, the piezoelectric ceramic generates displacement and vibration, which is the inverse piezoelectric effect of the piezoelectric ceramic. The piezoelectric fan is designed based on the principle of the inverse piezoelectric effect of piezoelectric ceramics.
When the power is applied, the piezoelectric ceramic generates vibration and displacement, and tiny mechanical vibration is amplified to large displacement through the amplification of the steel sheet. And an intelligent circuit is provided for controlling, so that the steel sheet swings, and an ideal heat dissipation effect can be ensured. The traditional fan steel sheet is formed by directly bonding a piezoelectric ceramic sheet and an amplifying sheet, and is continuously driven by double-path alternating current and driven by a single-path direct square wave, so that the impact on the piezoelectric ceramic sheet is very large, the fan steel sheet continuously works at a resonance point for a long time, the ceramic is very fatigue, the piezoelectric ceramic is damaged, the crack is easy to generate, the early failure is caused, the service life is greatly reduced, and the use requirement is difficult to meet.
Disclosure of Invention
The invention provides a multilayer full-symmetrical bidirectional alternating current balanced driving piezoelectric fan, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multilayer full-symmetric bidirectional alternating current balance driving piezoelectric fan comprises a piezoelectric ceramic piece, high-strength fibers and a steel sheet; the piezoelectric ceramic piece has two pieces, two surfaces of the ceramic are polarized, one surface of the ceramic is a positive electrode, and the other surface of the ceramic is a negative electrode. Auxiliary electrodes are respectively adhered to the front surface and the back surface of the piezoelectric ceramic piece. After the auxiliary electrodes are adhered, high-strength fibers are respectively adhered to the negative electrode surfaces of the two pieces of ceramic, and finally the adhered high-strength fibers are respectively adhered to the left side and the right side of the steel sheet, so that the high-strength fibers are mainly adhered to the steel sheet to form a composite electrode 0 with the steel sheet as the center and in a fully symmetrical structure at two sides of the piezoelectric fan.
Furthermore, the piezoelectric ceramic piece has a piezoelectric constant d33High-performance piezoelectric ceramics with the density of more than 800 PC/N.
Furthermore, the cathodes of the two piezoelectric ceramic pieces bonded with the auxiliary electrodes are bonded with high-strength fibers respectively and then are bonded on the steel piece finally to form a composite electrode shared by the two ceramic pieces in a full-symmetrical structure, and the electrode is 0 in the middle of the piezoelectric fan.
Furthermore, the middle electrode of the piezoelectric fan is made of multiple materials (piezoelectric ceramics, high-strength fibers, auxiliary electrodes, steel sheets and the like) and is symmetrical by taking the steel sheets as the center and is composed of a multilayer structure. The bonding of multiple materials is finished, and the multiple layers of bonding are carried out by adopting a high-temperature vacuum constant-pressure process, so that the internal stress of the fan can be reduced, the internal stress can be uniformly distributed, and the materials have a conductive function and become a common composite electrode 0 of the left piezoelectric ceramic piece and the right piezoelectric ceramic piece of the piezoelectric fan.
Furthermore, the middle steel sheet is bonded at the center of the piezoelectric fan, the steel sheet is used as a symmetrical center, the left side and the right side of the steel sheet are symmetrical and balanced, the internal stress of the fan is small and uniform, and the piezoelectric ceramic piece is prevented from being cracked due to overlarge local stress caused by nonuniform stress. Multiple layers and multiple materials are used in order to disperse and reduce the stress in the steel sheet through material change and the increase of the bonding layer. The high-temperature vacuum constant-pressure process is adopted to solve the problems of insecure bonding and large local stress caused by bubbles generated in the curing process of the bonding glue in the bonding process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the bidirectional alternating current balance drive is adopted, firstly, the voltage is slowly increased, so that the piezoelectric ceramics can avoid direct overvoltage impact and damage to the fragile piezoelectric ceramics; and secondly, double-path intermittent driving is adopted, so that the fatigue of the piezoelectric ceramic of single-path uninterrupted operation for a long time is avoided. Thirdly, a good discharging measure is adopted, so that the phenomenon that the ceramic is heated to lose effectiveness at an early stage due to the accumulation of redundant charges in the ceramic caused by incomplete discharging is avoided, and the service life is greatly prolonged;
(2) the middle electrode of the piezoelectric fan is made into a multi-material and multi-layer full-symmetrical structure. By utilizing the principle of mutual stress offset, the problems of large and uneven internal stress of the electrode and easy damage to piezoelectric ceramics are solved. The bonding strength between materials is enhanced, the mechanical strength of piezoelectric ceramics is enhanced, the requirements of a piezoelectric fan steel sheet are met, and the service life of the fan is greatly prolonged;
(3) the steel sheet adopts the anticorrosive stainless steel material of good elasticity, high strength as the amplifier of fan steel sheet vibration, opens the process aperture at the bonding position of steel sheet, reduces stress, improves bonding strength, is the strong resonance of reduction piezoelectric fan inside. Considering that the influence of air resistance on the steel sheet is reduced when the steel sheet swings, two pressure relief holes are formed in the middle of the steel sheet, so that the fan steel sheet swings to have small resistance, large elasticity and larger swing amplitude. In addition, the top end of the steel sheet is in arc transition, so that the noise caused by air friction of the steel sheet is further reduced.
(4) Has good practicability, mass production, and good economic and social benefits.
Drawings
Fig. 1 is a schematic structural diagram of a multilayer full-symmetric bidirectional ac balanced driving piezoelectric fan according to the present invention.
Fig. 2 is a schematic structural diagram of a steel sheet of a multilayer full-symmetric bidirectional alternating-current balanced driving piezoelectric fan.
The labels in the figure are: 1-piezoelectric ceramic piece, 2-high-strength fiber, 3-steel piece, 4-auxiliary electrode, 5-process hole and 6-pressure reducing hole.
Detailed Description
As shown in fig. 1, the multilayer symmetrical bidirectional alternating current balance driving piezoelectric fan comprises two piezoelectric ceramic sheets 1, a high-strength fiber 2, a steel sheet 3 and an auxiliary electrode 4; each piece of piezoelectric ceramic in the two pieces of piezoelectric ceramic pieces 1 is polarized to have two poles, and the positive face and the negative face are respectively a positive pole and a negative pole. The positive electrodes of the two piezoelectric ceramic pieces 1 face outwards, and the negative electrodes of the two piezoelectric ceramic pieces face inwards (towards the steel sheet 3). The front and back surfaces of the piezoelectric ceramic piece 1 are respectively adhered with the auxiliary electrodes 4. After the auxiliary electrode 4 is adhered, the high-strength fibers 2 are respectively adhered to the negative electrode surfaces of the two piezoelectric ceramic pieces 1, and finally the high-strength fibers 2 are respectively adhered to the left side and the right side of the steel piece 3. The piezoelectric ceramic cathode, the high-strength fiber 2 and the steel sheet 3 are mutually bonded to form a composite electrode 0 of the piezoelectric fan taking the steel sheet 3 as the center. Forming a fully symmetrical and complete piezoelectric ceramic fan.
The multilayer full-symmetrical bidirectional alternating current balance driving piezoelectric fan takes a steel sheet 3 as a symmetrical center, high-strength fibers 2 are respectively bonded on the left side and the right side of the steel sheet 3, piezoelectric ceramics 1 with auxiliary electrodes 4 bonded are formed into the piezoelectric fan with a full-symmetrical multilayer cantilever beam structure, and the like, wherein the piezoelectric constants d33 of the piezoelectric ceramics 1 bonded on the two sides are more than 800PC/N and are high-performance piezoelectric ceramics.
The voltage of the middle electrode of the fan is 0 volt, the positive electrode of the piezoelectric fan on the left side of the fan is connected with one path of current Va of the alternating-current double-path power supply, and the positive electrode of the piezoelectric fan on the right side of the fan is connected with the other path of current Vb of the alternating-current double-path power supply. The piezoelectric fan works by utilizing the piezoelectric effect of piezoelectric ceramics to respectively supply two paths of sine wave electricity to the piezoelectric ceramics at two sides of the fan. Two way sine wave electric phase differences 180, when the operation was in first half week, left side piezoceramics piece 1 work, and under piezoelectric effect's effect, pottery can extend to length direction, because the fan structure is the cantilever beam structure, the stiff end embedding is in the fan base, and this makes the length extend only can extend to the free end. Since one end of the fan is already fixed, the free end is deflected to the left. And because the steel sheet 3, the high-strength fiber 2 and the ceramic are bonded together, when the piezoelectric ceramic piece 1 deflects leftwards, the steel sheet 3 is driven to deflect leftwards together.
When the operation is performed to the next half cycle, the left piezoelectric ceramic piece 1 stops working, and the steel piece 3 is restored to the original state by using the memory characteristic. The piezoelectric ceramic plate 1 on the right side of the upper half cycle is in a rest and discharge state. When the fan runs to the lower half cycle, the right piezoelectric ceramic piece 1 works, and under the action of the piezoelectric effect, the piezoelectric ceramic piece 1 extends towards the length direction, and because the fan structure is a cantilever beam structure, the fixed end is embedded in the fan base, so that the length extension can only extend towards the free end. Since one end of the fan is already fixed, the free end is deflected to the right. And because the steel sheet 3, the high-strength fiber 2 and the ceramic are bonded together, when the piezoelectric ceramic piece 1 deflects rightwards, the steel sheet 3 is driven to deflect rightwards together.
When the operation is carried out to the next period, the right piezoelectric ceramic piece 1 stops working, and the steel piece 3 is restored to the original state by utilizing the memory characteristic of the steel piece 3. At the moment, the left piezoelectric ceramic piece 1 starts to work again and is repeatedly arranged in the intelligent control circuit, and the output voltage and frequency of the alternating current signal can be adjusted through the IO port. The amplitude of the swing of the steel sheet 3 becomes larger along with the rise of the driving voltage; the amplitude of oscillation of the steel sheet 3 is maximum at the resonance frequency point of the fan steel sheet 3. The frequency of the fan is always on the resonance point through the adjustment of the power supply frequency, and the optimal swing amplitude is obtained. The steel sheet 3 adopts the anticorrosive stainless steel material with good elasticity and high strength as the amplifier of the vibration of the fan steel sheet 3, the process hole 5 and the pressure reducing hole 6 are arranged at the bonding part of the steel sheet 3, the resistance of air to the steel sheet 3 is reduced, the sharp corner at the top of the steel sheet 3 adopts the arc transition, and the noise of the operation of the steel sheet 3 is reduced. Reduce stress and improve bonding strength. The swinging requirement of the fan steel sheet 3 can be met, and the best fan effect is achieved.
The multilayer full-symmetrical bidirectional alternating current balance driving piezoelectric fan disclosed by the invention is driven by adopting an alternating current bidirectional balance driving mode, is intelligently driven in an alternating current bidirectional balance manner, is slowly pressurized, works discontinuously, and is intelligently controlled, so that the piezoelectric fan is prevented from being impacted by overvoltage and working discontinuously, the piezoelectric fan is prevented from being damaged, and the piezoelectric fan is prevented from being short in long-time continuous working life. Reasonable driving mode and good discharge measure. Through intelligent control, the piezoelectric fan is always in the optimal working state. And the adoption of a full-symmetrical multilayer cantilever beam structure ensures the stress reduction and the stress distribution balance of the bonding layer in the fan. The stress inside the fan is further reduced and the bonding strength is further strengthened by the selection of the steel sheet 3 and the post-treatment and the adoption of the fabrication hole 5, as shown in fig. 2.
Considering that the influence of air resistance on the steel sheet 3 is reduced when the steel sheet 3 swings, two long pressure reducing holes are formed in the middle of the steel sheet 3, so that the resistance of the fan steel sheet 3 is reduced, the elasticity is large, and the swing amplitude is larger. In addition, the top end of the steel sheet 3 is in arc transition, so that the noise caused by air friction of the steel sheet 3 is further reduced. The piezoelectric fan has the advantages of ensuring low-noise, long-term and stable work of the piezoelectric fan, greatly improving the reliability of the fan, reducing noise and meeting the requirement of high-performance heat dissipation. Through the surface treatment to the fan, increase outer protection casing for piezoelectric fan can work in adverse circumstances for a long time, has improved piezoelectric fan's audience face and life greatly.
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 within the scope of the present invention.
Claims (4)
1. The utility model provides a balanced drive piezoelectric fan of two-way interchange of multilayer holohedral symmetry which characterized in that: the piezoelectric ceramic piece comprises piezoelectric ceramic pieces (1), high-strength fibers (2), a steel sheet (3) and auxiliary electrodes (4), wherein the piezoelectric ceramic pieces (1) are divided into a positive pole and a negative pole through polarized two faces, the positive poles of the two piezoelectric ceramic pieces (1) face outwards, the negative poles of the two piezoelectric ceramic pieces (1) face inwards, the auxiliary electrodes (4) are bonded on the positive faces and the negative faces of the two piezoelectric ceramic pieces (1), and the high-strength fibers (2) are bonded on the negative pole faces of the two piezoelectric ceramic pieces (1) respectively; respectively bonding the high-strength fibers (2) to the left side and the right side of the steel sheet (3); the piezoelectric ceramic piece (1), the high-strength fiber (2) and the steel sheet (3) are in a cantilever beam structure.
2. The multilayer full-symmetric bidirectional alternating-current balanced driving piezoelectric fan as claimed in claim 1, wherein: the piezoelectric ceramic piece (1) has a piezoelectric constant d33High-performance piezoelectric ceramics with the density of more than 800 PC/N.
3. The multilayer full-symmetric bidirectional alternating-current balanced driving piezoelectric fan as claimed in claim 1, wherein: the negative electrodes of the two piezoelectric ceramic pieces (1) bonded with the auxiliary electrodes (4) are bonded with the high-strength fibers (2) respectively and then are finally bonded on the steel sheet (3) to form a common electrode of the two pieces of ceramics, the common electrode is arranged in the middle of the piezoelectric fan to form a two-side full-symmetrical structure, and the electrodes are '0'.
4. The multilayer full-symmetric bidirectional alternating-current balanced driving piezoelectric fan as claimed in claim 1, wherein: a plurality of process holes are formed in the corresponding bonding position of the steel sheet (3) and the high-strength fiber (2), two pressure reducing holes (6) are formed in the middle of the steel sheet (3), and the top sharp corner of the steel sheet (3) is in arc transition.
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| CN202110361408.1A CN112983865A (en) | 2021-04-02 | 2021-04-02 | Multilayer full-symmetry bidirectional alternating-current balance driving piezoelectric fan |
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| CN202110361408.1A CN112983865A (en) | 2021-04-02 | 2021-04-02 | Multilayer full-symmetry bidirectional alternating-current balance driving piezoelectric fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115388046A (en) * | 2022-10-27 | 2022-11-25 | 成都汇通西电电子有限公司 | Low-noise combined piezoelectric fan capable of eliminating resonance |
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| CN204928623U (en) * | 2015-08-31 | 2015-12-30 | 江苏联能电子技术有限公司 | Piezoelectric fan of multilayer piezoceramics piece simultaneous working |
| CN110552905A (en) * | 2019-10-09 | 2019-12-10 | 合肥工业大学 | Piezoelectric fan with L-shaped framework film-coated blades |
| CN211397994U (en) * | 2019-12-31 | 2020-09-01 | 杨杰 | Mounting structure for rigidly fixing blades of piezoelectric fan set |
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2021
- 2021-04-02 CN CN202110361408.1A patent/CN112983865A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101354045A (en) * | 2007-07-26 | 2009-01-28 | 英特尔公司 | Piezoelectric fan, method of cooling a microelectronic device using same, and system containing same |
| CN103557188A (en) * | 2013-10-28 | 2014-02-05 | 广州市番禺奥迪威电子有限公司 | Direct-current piezoelectric type fan |
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| CN104506080A (en) * | 2015-01-26 | 2015-04-08 | 哈尔滨工业大学 | Shear type piezoelectric ceramic motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115388046A (en) * | 2022-10-27 | 2022-11-25 | 成都汇通西电电子有限公司 | Low-noise combined piezoelectric fan capable of eliminating resonance |
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