CN111567896A - Circumferential surface acoustic wave heating element - Google Patents

Circumferential surface acoustic wave heating element Download PDF

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Publication number
CN111567896A
CN111567896A CN202010490419.5A CN202010490419A CN111567896A CN 111567896 A CN111567896 A CN 111567896A CN 202010490419 A CN202010490419 A CN 202010490419A CN 111567896 A CN111567896 A CN 111567896A
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China
Prior art keywords
piezoelectric substrate
interdigital electrode
heating element
surface acoustic
electrode structure
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CN202010490419.5A
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CN111567896B (en
Inventor
李廷华
李寿波
巩效伟
朱东来
洪鎏
韩熠
吴俊�
张霞
赵伟
吕茜
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China Tobacco Yunnan Industrial Co Ltd
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China Tobacco Yunnan Industrial Co Ltd
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Publication of CN111567896A publication Critical patent/CN111567896A/en
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    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24FSMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46Shape or structure of electric heating means

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  • Resistance Heating (AREA)

Abstract

The invention discloses a circumferential surface acoustic wave heating element, which mainly comprises: the piezoelectric device comprises a piezoelectric substrate (11), an interdigital electrode structure and a protective base (3); the piezoelectric substrate (11) is cylindrical, and the inner wall of the cylinder at one end of the piezoelectric substrate is provided with a plurality of interdigital electrode structures; the upper end of the protection base (3) is sleeved in a cylinder of the piezoelectric substrate (11) with an interdigital electrode structure end, and an interdigital electrode structure is arranged between the outer wall of the upper end of the protection base (3) and the inner wall of the cylinder of the piezoelectric substrate (11). The circumferential surface acoustic wave heating element has the advantages of high heating efficiency, good thermal uniformity, no contact between a surface acoustic wave excitation source and a cigarette core, high safety coefficient and the like.

Description

Circumferential surface acoustic wave heating element
Technical Field
The invention belongs to the technical field of heating non-burning cigarettes, and particularly relates to a circumferential surface acoustic wave heating element.
Background
In recent years, with the increasingly severe global cigarette control situation and the gradual rise of health consciousness of consumers, the defects of the traditional cigarette become more and more prominent, the cigarette which is not burnt by heating has the remarkable advantage of reducing the release amount of harmful ingredients, so that the cigarette is attracted by the global scope, and becomes the competitive focus of various big tobacco companies at home and abroad.
The heating element is a core component for heating the non-combustible cigarette, and the quality of the heating performance of the heating element directly influences the smoking experience and the safe health condition of a user. In the prior art, the common heating elements for heating the non-burning cigarettes are resistance type heating, which is divided into central resistance type heating and circumferential resistance type heating; the circumferential resistance heating generally utilizes a stainless steel pipe to wrap a flexible circuit board to circumferentially heat the cigarette which is not combusted. Although the technical application of circumferential resistance heating is mature, the following technical defects are generally existed: 1. the cigarette is heated by heat conduction, the heat generated by a heating element is conducted from the periphery of the heated non-combustible cigarette to the inside, the cigarette core close to a heat source part is easy to carbonize due to excessive heating, the cigarette core far away from the heat source part is insufficient in fragrance and effective component release amount due to insufficient heating, and the overall sensory quality is poor; 2. the heating element stainless steel tube is in large-area contact with the cigarette core, tar substances generated in the heating process of heating the non-burning cigarette are easy to sinter and adhere to the inner wall of the stainless steel tube, so that the electric heating performance of the heating element is gradually reduced, and the smoking experience of a user is influenced; 3. when the heating element is triggered to work by mistake under the condition that the cigarette is not heated and not combusted, the heat can be accumulated continuously, the continuous temperature rise can reach 500-600 ℃, and the safety risk is high.
The acoustic surface wave is a mechanical wave propagating along the surface of an elastic medium, and the acoustic surface wave is used by the applicant to actively pump the tobacco juice and perform non-contact atomization on the tobacco juice, so that a good effect is achieved, and the acoustic surface wave is disclosed in patent ZL 2018100769411. The applicant has made elaborate efforts to find that surface wave based heating elements can be used to achieve heating of non-combustible cigarettes.
Disclosure of Invention
The invention provides a circumferential surface acoustic wave heating element for heating a non-combustible cigarette, which realizes heating of the non-combustible cigarette by utilizing a heat effect generated by interaction between surface acoustic waves and polar molecules in the non-combustible cigarette.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a circumferential surface acoustic wave heating element, comprising: the piezoelectric substrate 11, the interdigital electrode structure and the protective base 3;
the piezoelectric substrate 11 is cylindrical, and one or more interdigital electrode structures are arranged on the inner wall of the cylinder at one end of the piezoelectric substrate;
the upper end of the protection base 3 is sleeved in a cylinder of the piezoelectric substrate 11 with an interdigital electrode structure end, an interdigital electrode structure is arranged between the outer wall of the upper end of the protection base 3 and the inner wall of the cylinder of the piezoelectric substrate 11, and the outer wall of the protection base 3 and the inner wall of the cylinder of the piezoelectric substrate 11 form a seal to protect the interdigital electrode structure, but the operation of the interdigital electrode structure is not influenced.
Preferably, the inner wall of the piezoelectric substrate 11 and the surface of the interdigital electrode structure are coated with a protective film layer 14.
Preferably, the material of the piezoelectric substrate 11 includes a piezoelectric single crystal, a piezoelectric ceramic, or a piezoelectric thin film with a non-piezoelectric material as a supporting substrate.
Preferably, the interdigital electrode structure is a metal thin film of aluminum, gold, silver, platinum, or copper having a finger-crossing shape deposited on the surface of the piezoelectric substrate 11.
Compared with the prior art, the invention has the beneficial effects that:
1. the circumferential surface acoustic wave heating element heats the cigarette core through the 'internal friction heat' generated by the interaction between the surface acoustic wave and polar molecules such as water, alcohols, saccharides and the like in the heated non-combustible cigarette, and forms smoke, and the heating mechanism of the circumferential surface acoustic wave heating element is different from that of the conventional circumferential resistance heating element.
2. When the circumferential surface acoustic wave heating element is used, a cigarette which is not burnt and is heated is inserted into the cylinder body of the piezoelectric substrate 11, the surface acoustic waves are simultaneously excited by the plurality of interdigital electrode structures in the cylinder body, sound energy is absorbed in an all-around manner in the circumferential direction of the cigarette which is not burnt and is heated, polar molecules are promoted to move in a high frequency and collide with each other, and then the cigarette which is not burnt and is heated at different depths to generate heat. Therefore, the circumferential surface acoustic wave heating element has the advantages of high energy density, high heating efficiency and good thermal uniformity.
3. After the circumferential surface acoustic wave heating element is assembled, the surface acoustic wave excitation source, namely a plurality of interdigital electrode structures are not in contact with cigarettes for heating non-combustible cigarettes, so that the problem that tar substances are sintered and adhered on the surface acoustic wave excitation source and further the working performance of the heating element is influenced is effectively solved.
4. When the circumferential surface acoustic wave heating element is triggered to work by mistake under the condition that a cigarette is not heated and not burnt, the surface acoustic wave heating element shows a non-absorption normal propagation state on the piezoelectric substrate, the self heating value of the heating element is small, the surface temperature of the heating element is only introduced by the vibration damping loss of the piezoelectric substrate, and the safety risk of high temperature and high heat is avoided. The resistive heating element in the prior art is easy to cause high-temperature and high-heat safety risk due to dry burning.
Drawings
FIG. 1 is a schematic view of a circumferential surface acoustic wave heating element of the present invention.
Description of reference numerals: 1. circumferential surface acoustic wave heating element, 11, piezoelectric substrate, 12, first interdigital electrode structure, 121, first tab, 122, second tab, 13, second interdigital electrode structure, 131, third tab, 132, fourth tab, 14, protective film layer, 151, first lead, 152, second lead, 3, protective base, 31, first electrode pad, 32, second electrode pad.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
A schematic structural diagram of the circumferential surface acoustic wave heating element of the present embodiment is shown in fig. 1, the circumferential surface acoustic wave heating element is cylindrical, and has two interdigital electrode structures, namely a first interdigital electrode structure 12 and a second interdigital electrode structure 13, which are located on the inner wall of the cylinder at one end of the cylindrical piezoelectric substrate 11; the surfaces of the piezoelectric substrate 11, the first interdigital electrode structure 12 and the second interdigital electrode structure 13 are provided with a protective film layer 14, and the protective film material is generally silicon dioxide, teflon, parylene or SU8-2002 photoresist and the like; the piezoelectric substrate 11 is made of piezoelectric single crystals (such as quartz, lithium niobate, lithium tantalate, bismuth germanate, etc.), piezoelectric ceramics (such as lead zirconate titanate ceramics, etc.), or piezoelectric thin films (such as zinc oxide thin films, aluminum nitride thin films, lithium niobate thin films, etc.) using non-piezoelectric materials such as monocrystalline silicon, diamond, etc. as supporting substrates, in the specific embodiment of the invention, the piezoelectric substrate 11 is preferably made of lithium niobate piezoelectric single crystals with Y-cut X128.68 DEG direction, the thickness, the electromechanical coupling coefficient, the temperature coefficient and the sound surface wave propagation speed are respectively 0.495mm, 5.5%, -72X10-6/° C and 3992m/s, the interdigital electrode structure is formed by depositing an aluminum thin film with a finger-crossing shape on the inner wall of the piezoelectric substrate 11 through a micro-nano processing technology, the electrode is led out from bus bars at two sides of the interdigital electrode structure, and the electrode tabs at two sides of the first interdigital electrode structure 12 are first electrode tabs 121, second electrode tabs, The second pole lug 122, the pole lugs on both sides of the second interdigital electrode structure 13 are a third pole lug 131 and a fourth pole lug 132; wherein the first tab 121 and the third tab 131 are connected together to be electrically connected with the first lead 151, and the second tab 122 and the fourth tab 132 are connected together to be electrically connected with the second lead 152; the protection base 3 is cylindrical, the upper end of the protection base is sleeved in a cylinder with an interdigital electrode structure end of the piezoelectric substrate 11, an interdigital electrode structure is arranged between the outer wall of the upper end of the protection base 3 and the inner wall of the cylinder of the piezoelectric substrate 11, the outer wall of the upper end of the protection base 3 and the inner wall of the cylinder of the piezoelectric substrate 11 form sealing to protect the interdigital electrode structure, but the operation of the interdigital electrode structure is not influenced, two electrodes which can be respectively connected with an external signal source are arranged at the bottom end of the protection base 3 and are two electrode pads, namely a first electrode pad 31 and a second electrode pad 32, and the first electrode pad 31 and the second electrode pad 32 are respectively and electrically connected with a first lead 151 and a second lead 152; the sleeve base 3 is made of non-conductive high-temperature resistant materials, such as ceramics, high polymer materials and the like.
The working principle of the circumferential surface acoustic wave heating element for heating the non-combustible cigarette in the embodiment is as follows: inserting a cigarette which is not burnt and is heated into the cylinder body of the piezoelectric substrate 11, wherein the outer wall of the upper end of the protective base 3 and the inner wall of the cylinder of the piezoelectric substrate 11 form a sealed space, and the first interdigital electrode structure 12 and the second interdigital electrode structure 13 are in the sealed space without influencing the work of the first interdigital electrode structure and the second interdigital electrode structure; an external power supply is electrified, the first interdigital electrode structure 12 and the second interdigital electrode structure 13 are electrically connected with an external signal source through a first electrode pad 31 and a second electrode pad 32 at the bottom end of the sleeve base 3, the first interdigital electrode structure 12 and the second interdigital electrode structure 13 are driven by alternating electric signals, the piezoelectric substrate 11 can generate periodic deformation due to the deflection of a charge center, an elastic sound field is excited in the inner wall of the piezoelectric substrate 11 through the inverse piezoelectric effect, the electric signals are converted into acoustic signals, then surface acoustic waves propagating along the inner wall surface of the piezoelectric substrate 11 are formed, when the surface acoustic waves are in contact with polar molecules such as water, alcohols and saccharides in the non-combustible heated cigarette, polar molecules can move violently and rub against each other, the non-combustible heated cigarette can generate heat quickly, and smoke capable of being sucked by a user can be generated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (4)

1. A circumferential surface acoustic wave heating element, comprising: the piezoelectric device comprises a piezoelectric substrate (11), an interdigital electrode structure and a protective base (3);
the piezoelectric substrate (11) is cylindrical, and one or more interdigital electrode structures are arranged on the inner wall of the cylinder at one end of the piezoelectric substrate;
the upper end of the protection base (3) is sleeved in a cylinder of the piezoelectric substrate (11) with an interdigital electrode structure end, and an interdigital electrode structure is arranged between the outer wall of the upper end of the protection base (3) and the inner wall of the cylinder of the piezoelectric substrate (11).
2. A circumferential surface acoustic wave heating element, as set forth in claim 1, characterized in that said piezoelectric substrate (11) inner wall and interdigital electrode structure surface are coated with a protective film layer (14).
3. A circumferential surface acoustic wave heating element according to claim 1, wherein the material of said piezoelectric substrate (11) comprises piezoelectric single crystal, piezoelectric ceramic or piezoelectric thin film with non-piezoelectric material as a supporting substrate.
4. A circumferential surface acoustic wave heating element, as set forth in claim 1, wherein said interdigital electrode structure is a metal thin film of aluminum, gold, silver, platinum or copper having a finger-crossing shape deposited on the inner wall of said piezoelectric substrate (11).
CN202010490419.5A 2020-06-02 Circumferential surface acoustic wave heating element Active CN111567896B (en)

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CN111567896B CN111567896B (en) 2024-11-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113712265A (en) * 2021-10-08 2021-11-30 海南摩尔兄弟科技有限公司 Aerosol raw product, electronic atomizer and atomization system
CN114009838A (en) * 2021-11-25 2022-02-08 云南中烟工业有限责任公司 High-conductivity oil surface acoustic wave atomizer with flexible connection structure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008238058A (en) * 2007-03-27 2008-10-09 Matsushita Electric Works Ltd Elastic surface wave atomizer
JP2008304310A (en) * 2007-06-07 2008-12-18 Toppan Printing Co Ltd Surface acoustic wave device and spherical surface acoustic wave element
CN106174706A (en) * 2016-08-31 2016-12-07 云南中烟工业有限责任公司 A kind of acoustic surface wave atomizer
CN206025223U (en) * 2016-08-31 2017-03-22 云南中烟工业有限责任公司 Oil storage formula surface acoustic wave atomizer
CN107230819A (en) * 2016-03-24 2017-10-03 成都灯岛科技有限公司 It is integrated with the surface acoustic wave force sensors of antenna structure
CN111165896A (en) * 2020-02-26 2020-05-19 云南中烟工业有限责任公司 Surface acoustic wave electron cigarette with adjustable smog particle diameter
CN212414744U (en) * 2020-06-02 2021-01-29 云南中烟工业有限责任公司 Circumferential surface acoustic wave heating element

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008238058A (en) * 2007-03-27 2008-10-09 Matsushita Electric Works Ltd Elastic surface wave atomizer
JP2008304310A (en) * 2007-06-07 2008-12-18 Toppan Printing Co Ltd Surface acoustic wave device and spherical surface acoustic wave element
CN107230819A (en) * 2016-03-24 2017-10-03 成都灯岛科技有限公司 It is integrated with the surface acoustic wave force sensors of antenna structure
CN106174706A (en) * 2016-08-31 2016-12-07 云南中烟工业有限责任公司 A kind of acoustic surface wave atomizer
CN206025223U (en) * 2016-08-31 2017-03-22 云南中烟工业有限责任公司 Oil storage formula surface acoustic wave atomizer
CN111165896A (en) * 2020-02-26 2020-05-19 云南中烟工业有限责任公司 Surface acoustic wave electron cigarette with adjustable smog particle diameter
CN212414744U (en) * 2020-06-02 2021-01-29 云南中烟工业有限责任公司 Circumferential surface acoustic wave heating element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113712265A (en) * 2021-10-08 2021-11-30 海南摩尔兄弟科技有限公司 Aerosol raw product, electronic atomizer and atomization system
CN114009838A (en) * 2021-11-25 2022-02-08 云南中烟工业有限责任公司 High-conductivity oil surface acoustic wave atomizer with flexible connection structure

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