CN117884297B - Composite piezoelectric ceramic microporous atomizing sheet - Google Patents

Composite piezoelectric ceramic microporous atomizing sheet Download PDF

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CN117884297B
CN117884297B CN202410297496.7A CN202410297496A CN117884297B CN 117884297 B CN117884297 B CN 117884297B CN 202410297496 A CN202410297496 A CN 202410297496A CN 117884297 B CN117884297 B CN 117884297B
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piezoelectric ceramic
ceramic ring
ring
metal sheet
outer piezoelectric
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CN117884297A (en
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龚文
吴超峰
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Tongxiang Qingfeng Technology Co ltd
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Tongxiang Qingfeng Technology Co ltd
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Abstract

The invention discloses a composite piezoelectric ceramic microporous atomization sheet, which comprises an inner piezoelectric ceramic ring, an outer piezoelectric ceramic ring and a metal sheet; the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are arranged radially and are adhered by epoxy resin; the piezoelectric ceramic matrixes of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring can be selectively arranged; the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are respectively provided with an electrode, and the positions of the electrodes can be selectively set; the lower surfaces of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are bonded with the metal sheet through glue, and the outer edge of the metal sheet corresponds to the edge of the outer piezoelectric ceramic ring; an atomization area is arranged at the center of the metal sheet corresponding to the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring. According to the invention, the axial vibration of the metal sheet is improved by changing the material and the structure of the piezoelectric ceramic atomizing sheet, so that the atomization amount of a product is improved.

Description

Composite piezoelectric ceramic microporous atomizing sheet
Technical Field
The invention relates to the technical field of functional ceramics and atomization sheets, in particular to a composite piezoelectric ceramic microporous atomization sheet.
Background
An ultrasonic atomizer is a device for converting liquid into mist particles, and is widely applied to the fields of atomization disinfection, air humidification, medical cosmetology, spray drying and the like. The core of the ultrasonic atomizer is an atomizing component, and the working principle of the ultrasonic atomizer is that electric energy is converted into mechanical energy of high-frequency vibration, and the high-frequency vibration can tear liquid into tiny (1-15 mu m) liquid drops to form atomization. Wherein the size and the quantity of the liquid atomized particles are related to the intensity of the resonance frequency and the resonance amplitude of the piezoelectric ceramic sheet, and the larger the resonance frequency is, the smaller the atomized particles are; the stronger the resonance amplitude, the more the amount of atomization. However, the atomizer must have the atomizing sheet immersed in the liquid, and the liquid needs a certain height, so that long-term immersion will affect the atomizing effect and reduce the service life of the atomizing sheet; in addition, the conversion efficiency of the atomizer is low, and the atomization rate is extremely affected.
In recent years, a medical microporous mesh type atomizer is known, which is formed by bonding a piezoelectric ceramic sheet and a metal sheet. The working principle of the microporous net sheet atomizer is that radial vibration can be generated after certain voltage is applied to piezoelectric ceramics, then the metal sheet is driven to generate axial vibration, thousands of micron-level small holes are formed in the center of the metal sheet, and liquid on one side of the metal sheet is sprayed out through the small holes through the axial vibration, so that the atomization effect is achieved. The microporous net type atomization has no direct relation with the resonant frequency, but the maximum vibration force is far smaller than that of the piezoelectric ceramic, and the vibration potential of the piezoelectric ceramic cannot be fully exerted. Furthermore, the axial vibration of the metal sheet is reduced after a period of operation of the atomizer in this manner, resulting in a reduction in the amount and rate of atomization. Therefore, the microporous atomizing sheet is designed and optimized, and the defect problem is overcome.
Disclosure of Invention
The invention mainly aims to provide a composite piezoelectric ceramic microporous atomizing sheet, which is used for solving the problem that the vibration force of the atomizing sheet in the background technology is far smaller than that of piezoelectric ceramic so that the integral atomizing capability is low.
In order to achieve the above purpose, the present invention provides the following technical solutions: a composite piezoelectric ceramic microporous atomization sheet comprises an inner piezoelectric ceramic ring, an outer piezoelectric ceramic ring and a metal sheet; the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are arranged radially and are adhered by epoxy resin; the piezoelectric ceramic matrixes of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring can be selectively arranged; the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are respectively provided with an electrode, and the positions of the electrodes can be selectively set; the lower surfaces of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are bonded with the metal sheet through glue, and the outer edge of the metal sheet corresponds to the edge of the outer piezoelectric ceramic ring; and an atomization area is arranged at the center of the metal sheet corresponding to the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the piezoelectric ceramic matrix of the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring is any one of a PZT base, a KNN base or a BNT base.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the outer piezoelectric ceramic ring is made of a hard material, the piezoelectric constant of the outer piezoelectric ceramic ring is 180-380 pC/N, and the mechanical quality factor is more than 500; the piezoelectric ceramic ring is made of soft materials, the piezoelectric constant of the piezoelectric ceramic ring is 200-500 pC/N, and the mechanical quality factor is more than 100.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring are two concentric rings with different inner and outer diameters; the ratio of the inner diameter to the outer diameter of the outer piezoelectric ceramic ring to the inner piezoelectric ceramic ring is not less than 0.4.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the electrodes of the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring are arranged on the upper surface and the lower surface or the cylindrical surface; the electrode on the cylindrical surface cannot penetrate through the surface where the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are bonded with the metal sheet; the electrodes on the upper and lower surfaces cannot be led to the cylindrical surface of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the polarization directions of the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring are radial. The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: when the electrodes are on the cylindrical surface, the directions of the driving electric fields born by the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are consistent and radial, and the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are in a longitudinal vibration mode (d 33 mode); when the electrodes are arranged on the upper surface and the lower surface, the directions of the driving electric fields born by the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are mutually perpendicular to the polarization direction, and the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are in a shearing vibration mode (d 15 mode).
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the atomization area protrudes towards the directions of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring and consists of 400-3000 micro-sized small holes.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the small hole is of a conical structure and comprises a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are of round structures, and the size of the liquid inlet is larger than that of the liquid outlet; the size of the liquid inlet is 30-50 mu m, and the size of the liquid outlet is 1-5 mu m.
The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the liquid inlet is arranged on one side of the metal sheet depression, and the liquid outlet is arranged on one side of the metal sheet projection; the vibration direction of the central micropore area of the metal sheet is axial vibration.
The beneficial effects of the invention are as follows:
In the atomizing sheet, the composite structure of the inner piezoelectric ceramic ring, the outer piezoelectric ceramic ring and the metal sheet is characterized in that the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are arranged on different piezoelectric ceramic matrixes, namely the outer ring ceramic is made of hard materials with relatively larger mechanical quality factors, larger bandwidth and relatively smaller piezoelectric constants, and the inner ring ceramic is made of soft materials with large piezoelectric constants, so that the atomizing sheet has larger bandwidth and large vibration force, and the comprehensive performance of the atomizing sheet is improved.
Considering that the piezoelectric ceramic matrixes of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are different, the two piezoelectric ceramic matrixes are bonded through epoxy resin, so that the phenomenon that the ceramic rings are mutually extruded and broken due to different vibration frequencies of the two ceramic rings in operation is avoided.
According to the invention, the axial vibration of the metal sheet is improved by changing the material and the structure of the piezoelectric ceramic atomizing sheet, so that the atomization amount of a product is improved.
Drawings
FIG. 1 is a top view of a composite piezoelectric ceramic atomizer plate according to the present invention;
FIG. 2 is a front view of a composite piezoelectric ceramic atomizer plate according to the present invention;
in the figure: a1, an outer piezoelectric ceramic ring; b1, pressing a piezoelectric ceramic ring; c1, a metal sheet; d1, an atomization area; e1, epoxy resin.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the drawings in the embodiments, however, the following detailed description and the embodiments are only for illustrative purposes and not limiting the application.
In the description of the present invention, it should 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1 to 2 of the drawings, a composite piezoelectric ceramic microporous atomization sheet in the present embodiment includes an inner piezoelectric ceramic ring B1, an outer piezoelectric ceramic ring A1, and a metal sheet C1; the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1 are arranged radially and are adhered by epoxy resin E1; the piezoelectric ceramic matrixes of the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1 can be selectively arranged; electrodes are arranged on the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1, and the positions of the electrodes can be selectively set; the inner piezoelectric ceramic ring B1, the lower surface of the outer piezoelectric ceramic ring A1 and the metal sheet C1 are bonded through glue, and the outer edge of the metal sheet C1 corresponds to the edge of the outer piezoelectric ceramic ring A1; an atomization area D1 is arranged at the center of the metal sheet C1 corresponding to the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring.
The inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1 are two concentric rings with different inner and outer diameters, and the two concentric piezoelectric ceramic rings are arranged radially; more specifically, the ratio of the inner and outer diameters of the outer piezoelectric ceramic ring A1 and the inner piezoelectric ceramic ring B1 is not less than 0.4.
Further, the piezoelectric ceramic matrix of the outer piezoelectric ceramic ring A1 can be PZT-based, KNN-based, BNT-based and other system piezoelectric ceramic materials; the piezoelectric ceramic matrix of the piezoelectric ceramic ring B1 can be PZT-based, KNN-based, BNT-based and other system piezoelectric ceramic materials.
Preferably, the properties of the material of the outer piezoelectric ceramic ring A1 should be such that: the hard material has relatively large mechanical quality factor and large bandwidth, relatively small piezoelectric constant, and the piezoelectric constant is 180-380 pC/N, and the mechanical quality factor is more than 500; the performance of the piezoelectric ceramic ring B1 material should satisfy: the soft material has relatively large piezoelectric performance, large amplitude, relatively small mechanical quality factor, piezoelectric constant of 200-500 pC/N and mechanical quality factor of more than 100.
Further, electrodes of the outer piezoelectric ceramic ring A1 and the inner piezoelectric ceramic ring B1 are arranged on the upper surface and the lower surface or the cylindrical surface; the electrode positioned on the cylindrical surface cannot penetrate through the surface where the inner piezoelectric ceramic ring, the outer piezoelectric ceramic ring A1 and the metal sheet C1 are bonded; electrodes on the upper and lower surfaces cannot be led to the cylindrical surfaces of the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1;
Meanwhile, the polarization directions of the outer piezoelectric ceramic ring A1 and the inner piezoelectric ceramic ring B1 are radial.
Specifically, when the electrodes are on the cylindrical surface, the directions of the driving electric fields and the polarization directions of the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1 are consistent and radial, and the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1 are in a longitudinal vibration mode (d 33 mode); compared with the transverse vibration mode (d 31 mode) used by the traditional microporous atomization sheet under the same electric field intensity, the performance of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring can be fully exerted, and the vibration of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring is enhanced to further drive the vibration of the metal sheet.
When the electrodes are arranged on the upper surface and the lower surface, the directions of the driving electric fields received by the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1 are mutually perpendicular to the polarization directions, and the inner piezoelectric ceramic ring B1 and the outer piezoelectric ceramic ring A1 are in a shearing vibration mode (d 15 mode); stronger than d33 mode under the same driving electric field intensity; the inner and outer piezoelectric ceramic rings in this form can enhance the larger vibration force, thereby further enhancing the axial vibration of the metal foil C1 bonded thereto.
Further, an atomization area D1 is arranged in the center of the metal sheet C1, the atomization area D1 protrudes inwards and outwards in the direction of the piezoelectric ceramic ring, and the metal sheet C1 is composed of 400-3000 micron-sized small holes.
Specifically, the micropore of micron level is coniform, mainly falls into inlet and liquid outlet, and the shape of inlet and liquid outlet is circular structure, and the size of inlet is greater than the size of liquid outlet, and the size of inlet is 30~50 mu m, and the size of liquid outlet is 1~5 mu m.
More specifically, the liquid inlet is arranged at one side of the concave part of the metal sheet C1, and the liquid outlet is arranged at one side of the convex part of the metal sheet C1; the vibration direction of the central micropore region of the metal sheet C1 is axial vibration.
The working mode of the invention is a shearing vibration mode, and under the action of an external electric field, the radial vibration of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring is converted into the axial vibration of the metal sheet C1 through shearing deformation.
In the atomizing sheet, the composite structure of the inner piezoelectric ceramic ring, the outer piezoelectric ceramic ring and the metal sheet C1 is characterized in that the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are arranged on different piezoelectric ceramic matrixes, namely the outer ring ceramic is made of hard materials with relatively larger mechanical quality factors, larger bandwidth and relatively smaller piezoelectric constants, and the inner ring ceramic is made of soft materials with large piezoelectric constants, so that the atomizing sheet has larger bandwidth and large vibration force, and the comprehensive performance of the atomizing sheet is improved.
In addition, because the piezoelectric ceramic matrixes of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are different, the two piezoelectric ceramic matrixes are bonded through the epoxy resin E1, so that the ceramic rings are prevented from being crushed due to mutual extrusion caused by different vibration frequencies of the two ceramic rings in operation.
According to the invention, the axial vibration of the metal sheet C1 is improved by changing the material and the structure of the piezoelectric ceramic atomizing sheet, so that the atomization amount of a product is improved.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims (7)

1. A composite piezoelectric ceramic microporous atomizing sheet is characterized in that: comprises an inner piezoelectric ceramic ring, an outer piezoelectric ceramic ring and a metal sheet; the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are arranged radially and are adhered by epoxy resin; the piezoelectric ceramic matrixes of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring can be selectively arranged; the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are respectively provided with an electrode, and the positions of the electrodes can be selectively set; the lower surfaces of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are bonded with the metal sheet through glue, and the outer edge of the metal sheet corresponds to the edge of the outer piezoelectric ceramic ring; an atomization area is arranged at the center of the metal sheet corresponding to the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring;
the piezoelectric ceramic matrix of the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring is any one of a PZT base, a KNN base or a BNT base;
The outer piezoelectric ceramic ring is made of a hard material, the piezoelectric constant of the outer piezoelectric ceramic ring is 180-380 pC/N, and the mechanical quality factor is more than 500; the piezoelectric ceramic ring is made of soft materials, the piezoelectric constant of the piezoelectric ceramic ring is 200-500 pC/N, and the mechanical quality factor is more than 100;
the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring are two concentric rings with different inner and outer diameters; the ratio of the inner diameter to the outer diameter of the outer piezoelectric ceramic ring to the inner piezoelectric ceramic ring is not less than 0.4.
2. The composite piezoelectric ceramic microporous atomization sheet according to claim 1, wherein: the electrodes of the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring are arranged on the upper surface and the lower surface or the cylindrical surface; the electrode on the cylindrical surface cannot penetrate through the surface where the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are bonded with the metal sheet; the electrodes on the upper and lower surfaces cannot be led to the cylindrical surface of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring.
3. The composite piezoelectric ceramic microporous atomization sheet according to claim 2, wherein: the polarization directions of the outer piezoelectric ceramic ring and the inner piezoelectric ceramic ring are radial.
4. A composite piezoelectric ceramic microporous atomizer sheet according to claim 3, wherein: when the electrodes are on the cylindrical surface, the directions of the driving electric fields born by the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are consistent and radial, and the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are in a longitudinal vibration mode; when the electrodes are arranged on the upper surface and the lower surface, the directions of the driving electric fields born by the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are mutually perpendicular to the polarization directions, and the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring are in a shearing vibration mode.
5. The composite piezoelectric ceramic microporous atomization sheet according to claim 1, wherein: the atomization area protrudes towards the directions of the inner piezoelectric ceramic ring and the outer piezoelectric ceramic ring and consists of 400-3000 micro-sized small holes.
6. The composite piezoelectric ceramic microporous atomization sheet according to claim 5, wherein: the small hole is of a conical structure and comprises a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are of round structures, and the size of the liquid inlet is larger than that of the liquid outlet; the size of the liquid inlet is 30-50 mu m, and the size of the liquid outlet is 1-5 mu m.
7. The composite piezoelectric ceramic microporous atomization sheet according to claim 6, wherein: the liquid inlet is arranged on one side of the metal sheet depression, and the liquid outlet is arranged on one side of the metal sheet projection; the vibration direction of the central micropore area of the metal sheet is axial vibration.
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US6140747A (en) * 1997-12-16 2000-10-31 Nec Corporation Piezoelectric transformer element and method of manufacturing the same
CN102130293A (en) * 2010-12-06 2011-07-20 中国船舶重工集团公司第七一五研究所 Method for preparing high temperature resistant double-layer piezoelectric composite material component
CN103769337A (en) * 2014-01-15 2014-05-07 江苏大学 Intermediate-frequency ultrasonic atomizer
CN113262923A (en) * 2020-02-14 2021-08-17 深圳麦克韦尔科技有限公司 Micropore atomization sheet and atomization device
CN117279523A (en) * 2021-03-10 2023-12-22 菲利普莫里斯生产公司 Aerosol generating device using a vibrating transducer and controlled liquid supply
CN220329080U (en) * 2023-06-21 2024-01-12 广东奥迪威传感科技股份有限公司 Microporous atomization sheet for preventing seepage

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CN206587973U (en) * 2016-12-30 2017-10-27 杭州艾新医疗科技有限公司 A kind of Composite atomization piece
US11889861B2 (en) * 2019-09-23 2024-02-06 Rai Strategic Holdings, Inc. Arrangement of atomization assemblies for aerosol delivery device
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Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86206715U (en) * 1986-09-05 1987-06-03 李少夫 Ultrasonic atomized energy converter with packaged vibrator and flexible components
US6140747A (en) * 1997-12-16 2000-10-31 Nec Corporation Piezoelectric transformer element and method of manufacturing the same
CN102130293A (en) * 2010-12-06 2011-07-20 中国船舶重工集团公司第七一五研究所 Method for preparing high temperature resistant double-layer piezoelectric composite material component
CN103769337A (en) * 2014-01-15 2014-05-07 江苏大学 Intermediate-frequency ultrasonic atomizer
CN113262923A (en) * 2020-02-14 2021-08-17 深圳麦克韦尔科技有限公司 Micropore atomization sheet and atomization device
CN117279523A (en) * 2021-03-10 2023-12-22 菲利普莫里斯生产公司 Aerosol generating device using a vibrating transducer and controlled liquid supply
CN220329080U (en) * 2023-06-21 2024-01-12 广东奥迪威传感科技股份有限公司 Microporous atomization sheet for preventing seepage

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