WO2019144659A1 - 一种声表面波电子烟系统 - Google Patents

一种声表面波电子烟系统 Download PDF

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Publication number
WO2019144659A1
WO2019144659A1 PCT/CN2018/111769 CN2018111769W WO2019144659A1 WO 2019144659 A1 WO2019144659 A1 WO 2019144659A1 CN 2018111769 W CN2018111769 W CN 2018111769W WO 2019144659 A1 WO2019144659 A1 WO 2019144659A1
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WIPO (PCT)
Prior art keywords
liquid
acoustic wave
surface acoustic
interdigital transducer
electronic cigarette
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PCT/CN2018/111769
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English (en)
French (fr)
Inventor
李廷华
韩熠
韩俊茏
朱东来
胡泓
陈永宽
吴俊�
李寿波
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云南中烟工业有限责任公司
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Application filed by 云南中烟工业有限责任公司 filed Critical 云南中烟工业有限责任公司
Priority to KR1020197024449A priority Critical patent/KR102152958B1/ko
Priority to JP2019541334A priority patent/JP6779384B2/ja
Priority to US16/479,218 priority patent/US10986865B2/en
Priority to RU2019128306A priority patent/RU2713347C1/ru
Priority to EP18902806.1A priority patent/EP3574778B1/en
Publication of WO2019144659A1 publication Critical patent/WO2019144659A1/zh

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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/05—Devices without heating means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/30—Devices using two or more structurally separated inhalable precursors, e.g. using two liquid precursors in two cartridges
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/10—Chemical features of tobacco products or tobacco substitutes
    • A24B15/16—Chemical features of tobacco products or tobacco substitutes of tobacco substitutes
    • A24B15/167—Chemical features of tobacco products or tobacco substitutes of tobacco substitutes in liquid or vaporisable form, e.g. liquid compositions for electronic cigarettes
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/10—Devices using liquid inhalable precursors
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/42—Cartridges or containers for inhalable precursors
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/48—Fluid transfer means, e.g. pumps
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/50—Control or monitoring
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00—Smokers' requisites not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/022—Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices

Definitions

  • the invention belongs to the technical field of electronic cigarettes, and in particular relates to a surface acoustic wave electronic cigarette system.
  • the electrothermal atomization is based on the principle of heat conduction, and the electronic cigarette is triggered by an air flow sensor, a mechanical button or a touch button, and the conduction circuit supplies power to a heating wire wound from a nickel-chromium alloy, a stainless steel alloy, a nickel 200 alloy or a titanium alloy.
  • the heated liquid is atomized to form an aerosol and is inhaled by the user.
  • the electrothermal atomization electronic cigarette has high thermal conductivity and high atomization efficiency, during the continuous smoking process of the electronic cigarette, the heating wire can continuously heat up to 500-600 ° C, and there is a potential safety risk, and the high temperature pyrolysis of the liquid smoke is released. Harmful components such as aldehydes have great health risks.
  • Ultrasonic atomization uses high-frequency oscillation of the ultrasonic transducer to cause high-frequency resonance of the vibrating piece, and then the ultrasonic directional pressure is generated, so that the surface of the liquid smoke rises, cavitation occurs around the raised liquid surface, and the aerosol is atomized to generate an aerosol. .
  • the non-high thermal characteristics of the ultrasonic atomized electronic cigarette make the safety increase and the release of harmful substances lower than that of the electrothermal atomized electronic cigarette, since the ultrasonic wave is a bulk acoustic wave, the energy is uncontrollably directed during the propagation process. Diffusion around, resulting in high atomization power consumption, slow rate, low efficiency, it is difficult to continuously and stably produce aerosols with uniform particle size distribution, and the effect of atomization of high viscosity smoke liquid is not good.
  • the present invention combines the unique advantages of the surface acoustic wave technology with the functional characteristics and performance requirements of the electronic cigarette, and provides based on the surface acoustic wave acoustic flow effect and the standing wave acoustic surface wave atomization mechanism.
  • An electronic cigarette system for active liquid guiding, surface acoustic wave non-contact atomization, and surface acoustic wave by surface acoustic wave effectively overcoming the potential safety and health risks caused by rapid thermal heating of electrothermal atomization, and high efficiency and inefficiency of ultrasonic atomization
  • the aerosol particle size distribution is not uniform, which is not suitable for the defect of high-viscosity smoke liquid atomization, and the prior art electronic cigarette passive liquid guiding solution is reasonably solved, so that the suction quality is not good, and the contact atomization affects the heating wire or vibration.
  • the problem of film atomization performance or service life is not uniform, which is not suitable for the defect of high-viscosity smoke liquid atomization, and the prior art electronic cigarette passive liquid guiding solution is reasonably solved, so that the suction quality is not good, and the contact atomization affects the heating wire or vibration.
  • the invention discloses a surface acoustic wave electronic cigarette system, which comprises a piezoelectric substrate 1, a liquid guiding chamber 2, an atomizing chamber 3 and a feeding port 4 for loading a high frequency signal.
  • the liquid guiding chamber 2 and the atomizing chamber 3 are disposed on the upper surface of the piezoelectric substrate 1, and the separating plate 13 is disposed between the liquid guiding chamber 2 and the atomizing chamber 3; the feeding port 4
  • An external high frequency signal source is disposed outside the piezoelectric substrate 1;
  • the liquid guiding chamber 2 includes a first interdigital transducer 51, a liquid storage chamber 6 and a micro flow channel 8, and the first interdigital transducer is transduced
  • a microchannel 8 disposed on both sides of the liquid storage chamber 6, the liquid storage chamber 6 is in communication with the micro flow channel 8, and the liquid storage port 6 has a liquid injection port 7 at the top thereof;
  • the bottom of the atomization chamber 3 is provided with a T-type fiber paper 10 embedded in the
  • the first interdigital transducer 51, the reservoir 6, the microchannel 8, the second interdigital transducer 52, the third interdigital transducer 53 and the T-fiber paper 10 are both The surface of the piezoelectric substrate 1 is closely attached.
  • the piezoelectric substrate 1 material is one of quartz, piezoelectric ceramic, lithium niobate or lithium niobate.
  • the piezoelectric substrate 1 is a lithium niobate having a Y-cut X 128.68° direction, and the thickness, electromechanical coupling coefficient, temperature coefficient, and surface acoustic wave propagation velocity are 0.5 mm, 5.5%, and -72 ⁇ 10 -6 / respectively. °C and 3992m/s.
  • the traveling wave mode surface acoustic wave excited by the first interdigital transducer 51 actively pumps the liquid smoke stored in the liquid storage chamber 6 to the liquid outlet 9 of the micro flow channel 8;
  • the standing wave mode surface acoustic wave generated by the cooperation of the second interdigital transducer 52 and the third interdigital transducer 53 atomizes the liquid film of the liquid smoke on the T-fiber paper 10 into an aerosol.
  • the material of the liquid storage chamber 6 and the micro flow channel 8 is borosilicate glass or polydimethylsiloxane; the T-type fiber paper 10 is an organic porous material.
  • the shapes of the first interdigital transducer 51, the second interdigital transducer 52, and the third interdigital transducer 53 are all finger-crossing shapes and are metal thin films.
  • the metal film is a film of aluminum, copper or gold.
  • the surface acoustic wave is a mechanical wave propagating along the surface of the elastic medium.
  • the energy is mainly concentrated on the surface of the medium and exponentially decays with depth.
  • the energy directional concentration characteristic makes the atomization efficiency high, can continuously and stably produce an aerosol with good particle size uniformity, and is more suitable for atomizing high viscosity liquid smoke than ultrasonic waves.
  • the surface acoustic wave excitation frequency is usually 10MHz-500MHz, which is an order of magnitude higher than the ultrasonic 20kHz-3MHz.
  • the relationship between aerosol particle size and frequency (where d is the aerosol particle size, ⁇ is the surface tension of the smoke liquid, ⁇ is the density of the smoke liquid, and f is the excitation frequency).
  • the aerosol particle size is inversely proportional to the excitation frequency of 2/3. Therefore, compared with the ultrasonic atomization, the aerosol generated by the surface acoustic wave atomization has a smaller particle size, is less likely to remain on the oral mucosa or the tongue surface, has a stronger suction comfort, and is more mellow and delicate.
  • the acoustic surface wave is atomized by the acoustic energy of the diffracted liquid into the smoke liquid.
  • the driving power is generally 0.5W-3W, and the calorific value is small.
  • the piezoelectric substrate has a certain heat dissipation effect, even when continuously pumping, the heat is not easy. Accumulation, the temperature does not rise rapidly, greatly reducing the possibility of high temperature pyrolysis. Therefore, the surface acoustic wave atomization safety performance is good, and the release amount of harmful substances is bound to be much lower than the electrothermal atomization.
  • the electronic cigarette system of the present invention integrates a liquid guiding cavity, and based on the acoustic surface wave acoustic flow effect, the traveling wave mode surface acoustic wave generated by the first interdigital transducer provides driving force to realize active pumping of the tobacco liquid.
  • the driving power to precisely control the liquid guiding rate of the smoke liquid, it is matched with the atomization rate to ensure continuous and stable pumping of the liquid smoke and timely full atomization, thereby solving the technical defects of the passive liquid guiding and avoiding The phenomenon of dry burning occurs, which improves the quality of the suction and enhances the user experience.
  • the second interdigital transducer 52 and the third interdigital transducer 53 of the electronic cigarette system of the present invention are not in contact with the T-fiber paper 10, through the second interdigital transducer and the third fork Refers to the standing wave mode surface acoustic wave excited by the transducer to achieve non-contact atomization of the liquid film of the tobacco liquid on the T-fiber paper. Since the liquid smoke is not in direct contact with the transducer, there is no problem that the smoke liquid sinters on the transducer and thus affects the performance or service life of the transducer.
  • the standing wave mode surface acoustic wave has a large energy base and a strong atomization ability to the smoke liquid, and therefore the electronic cigarette system of the present invention can generate a sufficiently large amount of smoke per unit time, and the user can quickly obtain a suction satisfaction.
  • FIG. 1 is a schematic structural view of an electronic cigarette system for realizing active and non-contact atomization by surface acoustic waves according to the present invention
  • FIG. 2 is a partial enlarged view of a liquid guiding chamber of an electronic cigarette system according to the present invention
  • FIG 3 is a partial enlarged view of the atomization chamber of the electronic cigarette system of the present invention.
  • FIG. 1 is a schematic structural view of a surface acoustic wave electronic cigarette system according to an embodiment of the present invention.
  • the system includes a piezoelectric substrate 1, a liquid guiding chamber 2, an atomizing chamber 3, and a feeding port 4.
  • the liquid guiding chamber 2 and the atomizing chamber 3 are disposed above the piezoelectric substrate 1, and the two chambers are placed in close proximity with a partitioning plate 13 in the middle.
  • a partial enlarged view of the liquid guiding chamber and the atomizing chamber are shown in Figures 2 and 3, respectively.
  • the feed port 4 is disposed outside the piezoelectric substrate 1 and is externally connected to a high frequency signal source.
  • the liquid guiding chamber 2 is composed of a first interdigital transducer 51, a liquid storage chamber 6, a liquid filling port 7 provided at the top of the liquid storage chamber 6, and a micro flow path 8 communicating with the liquid storage chamber 6.
  • the bottom of the atomization chamber 3 is provided with a T-shaped fiber paper 10, a second interdigital transducer 52 and a third interdigital transducer 53.
  • the side and the top of the atomization chamber 3 are respectively provided with an air inlet 11 and The nozzle 12 is.
  • the first interdigital transducer 51, the liquid storage chamber 6, the micro flow channel 8, the second interdigital transducer 52, the third interdigital transducer 53 and the T-fiber paper 10 are vertically and closely attached to the pressure.
  • the piezoelectric substrate 1 is composed of a material having piezoelectric characteristics such as quartz, piezoelectric ceramics, lithium niobate or lithium niobate.
  • the lithium niobate of the Y-cut X 128.68° direction has a thickness, an electromechanical coupling coefficient, a temperature coefficient, and a surface acoustic wave propagation velocity of 0.5 mm, 5.5%, -72 x 10 -6 /° C., and 3992 m/s, respectively.
  • the first interdigital transducer 51, the second interdigital transducer 52, and the third interdigital transducer 53 are sputter deposited on a metal film of aluminum, copper or gold having a finger cross shape by a micromachining process.
  • the surface-polished piezoelectric substrate is formed and connected to a high-frequency signal source through a feed port 4 provided outside the piezoelectric substrate.
  • a first interdigital transducer 51 is placed on one side of the reservoir chamber 6, and the other side opposite thereto is in communication with the microchannel 8.
  • the material of the liquid storage chamber 6 and the micro flow path 8 is made of borosilicate glass or polydimethylsiloxane.
  • the first interdigital transducer 51 is configured to excite a traveling wave mode surface acoustic wave, provide a driving force for the liquid smoke stored in the liquid storage chamber 6, and actively pump the liquid liquid to the micro flow path 8.
  • the T-type fiber paper 10 is inserted into the micro-channel 8 through the liquid outlet 9, for uniformly dispersing the liquid smoke and rapidly forming a liquid film, and the material is selected from polyester fiber or other organic porous material.
  • the second interdigital transducer 52 and the third interdigital transducer 53 are placed on opposite sides of the T-type fiber paper to form a certain phase in the distance, and the standing wave mode surface acoustic wave generated by the interaction is the T-shaped fiber.
  • the liquid film of the liquid smoke on the paper is atomized into an aerosol.
  • the liquid smoke is injected into the liquid storage chamber 6 through the liquid injection port 7 until the liquid level of the liquid smoke reaches a certain height.
  • the smoke liquid does not flow.
  • the high frequency signal source is activated, and the first interdigital transducer 51, the second interdigital transducer 52, and the third interdigital transducer 53 are energized by the feed port 4 to apply an alternating current signal, and the transducer utilizes
  • the inverse piezoelectric effect of the piezoelectric substrate itself converts the electrical signal into an acoustic signal, forming a surface acoustic wave that propagates at the same frequency as the applied signal and along the surface of the piezoelectric substrate.
  • the traveling wave mode surface acoustic wave generated by the first interdigital transducer 51 When the traveling wave mode surface acoustic wave generated by the first interdigital transducer 51 is propagated into the liquid storage chamber 6, the acoustic energy is diffracted into the liquid smoke, and the acoustic flow coupling effect occurs, so that the liquid storage chamber 6 and the liquid outlet 9 are The pressure difference is formed, the pressure field balance of the liquid storage tank 6 is broken, and the smoke liquid is actively pumped to the liquid discharge port 9 through the micro flow path 8, and rapidly and evenly dispersed on the T-type fiber paper 10 to form a liquid liquid film of the liquid liquid.
  • the pressure difference By adjusting the driving power, the pressure difference can be changed, and the quantitative control of the liquid guiding rate can be realized to ensure continuous and stable pumping of the liquid smoke and timely full atomization.
  • the traveling wave mode of the traveling wave mode excited by the second interdigital transducer 52 and the third interdigital transducer 53 superimposes to form a standing wave mode surface acoustic wave having a large energy base.
  • the standing wave mode surface acoustic wave is in contact with the liquid liquid film on the T-type fiber paper 10, the energy carried by it will strongly disturb the free surface of the liquid film, so that the surface tension of the liquid film itself is insufficient to maintain the geometric shape stability. And rupture to produce an aerosol.

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Abstract

一种声表面波电子烟系统，包括压电基底(1)、导液腔(2)、雾化腔(3)以及用于加载高频信号的馈电端口(4)。所述导液腔(2)与所述雾化腔(3)设置于所述压电基底(1)上方；所述导液腔(2)与所述雾化腔(3)中间设有隔离板(13)；所述馈电端口(4)设置于所述压电基底(1)外侧。

Description

一种声表面波电子烟系统 技术领域
本发明属于电子烟技术领域，具体涉及一种声表面波电子烟系统。
背景技术
近年来，在全球控烟形势和公众健康舆论的双重压力下，传统卷烟的发展受到越来越多地制约，电子烟作为一种新型低危害卷烟替代品，正日益受到广大消费者的普遍青睐，全球电子烟市场呈现持续发展态势。
现有的电子烟，绝大多数以电热式雾化为主，少部分采用超声波雾化。电热式雾化基于热传导原理，通过气流传感器、机械按键或触控按键触发电子烟工作，导通电路给由镍铬合金、不锈钢合金、镍200合金或钛合金绕制而成的发热丝供电，加热烟液雾化形成气溶胶并供用户吸入。尽管电热式雾化电子烟导热速率快、雾化效率高，但电子烟连续抽吸过程中，发热丝持续升温可高达500-600℃，存在潜在安全风险的同时，烟液高温热解会释放醛类等有害成分，健康隐患大。超声波雾化利用超声换能器的高频震荡引起振动片高频谐振，进而产生超声波定向压强，使烟液表面隆起，在隆起的液面周围发生空化作用，使烟液雾化产生气溶胶。虽然与电热式雾化电子烟相比，超声波雾化电子烟的非高热特性使得安全性提高、有害物质释放量降低，然而由于超声波是一种体声波，能量在传播过程中会不可控地向四周扩散，导致烟液雾化功耗高、速率慢、效率低，难以连续稳定地产生粒径分布均匀的气溶胶，且对于高粘度烟液雾化效果不佳。此外，值得一提的是，基于前述2种雾化方式的电子烟，还普遍存在如下共性问题：(1)通过导液材料毛细作用进行被动导液，导液速率不可控、不稳定，当导液速率小于雾化速率时，容易干烧产生异味，严重影响抽吸品质和感官体验；(2)属于接触式雾化，烟液与发热丝或振动片直接接触，容易烧结粘附，进而影响到发热丝或振动片的雾化性能，甚至缩短其使用寿命。因此，现有技术亟待改进与突破。
发明内容
鉴于上述现有技术的不足，本发明将声表面波技术的独特优势与电子烟的功能特点、性能需求有机结合，并基于声表面波声致流效应和驻波声表面波雾化机理，提供一种通过声表面波实现主动导液、声表面波非接触雾化、以及声表面波 的电子烟系统，有效克服了电热式雾化快速高热引发潜在安全健康风险，超声波雾化高耗低效、气溶胶粒径分布不均匀、不适用于高粘度烟液雾化的缺陷，并合理解决现有技术中的电子烟被动式导液使得抽吸品质不佳、接触式雾化影响发热丝或振动片雾化性能或使用寿命的问题。
本发明公开了一种声表面波电子烟系统，其包括压电基底1、导液腔2、雾化腔3以及用于加载高频信号的馈电端口4。所述导液腔2与所述雾化腔3设置于所述压电基底1上表面，所述导液腔2与所述雾化腔3中间设有隔离板13；所述馈电端口4设置于所述压电基底1外侧，外接高频信号源；所述导液腔2包括第一叉指换能器51、储液仓6和微流道8，所述第一叉指换能器51和微流道8布置在所述储液仓6的两侧，所述储液仓6与所述微流道8相连通，所述储液仓6的顶部有注液口7；所述雾化腔3底部设置有通过出液口9嵌入到微流道8的T型纤维纸10、置于T型纤维纸10两侧且与所述T型纤维纸10不接触的第二叉指换能器52和第三叉指换能器53，所述雾化腔3侧部及顶部分别设置有进气口11和吸嘴12。
优选地，所述第一叉指换能器51、储液仓6、微流道8、第二叉指换能器52、第三叉指换能器53和T型纤维纸10均与所述压电基底1表面紧密贴合。
优选地，所述压电基底1材料为石英、压电陶瓷、钽酸锂或铌酸锂的一种。
优选地，所述压电基底1为Y切X 128.68°方向的铌酸锂，其厚度、机电耦合系数、温度系数和声表面波的传播速度分别为0.5mm、5.5％、-72x10 -6/℃和3992m/s。
优选地，所述第一叉指换能器51激发的行波模式声表面波将所述储液仓6内存放的烟液主动泵送至所述微流道8的出液口9；所述第二叉指换能器52和所述第三叉指换能器53共同作用产生的驻波模式声表面波将所述T型纤维纸10上的烟液液膜雾化成气溶胶。
优选地，所述储液仓6和所述微流道8的材料为高硼硅玻璃或聚二甲基硅氧烷；所述T型纤维纸10为有机多孔材料。
优选地，所述第一叉指换能器51、所述第二叉指换能器52和所述第三叉指换能器53的形状都是手指交叉形状，且为金属薄膜。
优选地，所述金属薄膜为铝、铜或金薄膜。
与现有技术相比，本发明的有益效果是：
(1)声表面波是一种沿弹性介质表面上传播的机械波，能量主要集中在介质表面，且随深度呈指数衰减。其能量定向集中特性使得雾化效率高、能连续稳定地产生粒径均匀性好的气溶胶，且比超声波更适合雾化高粘度的烟液。此外，声表面波的激励频率通常为10MHz-500MHz，比超声波20kHz-3MHz高一个数量级。由气溶胶粒径与频率的关系式
Figure PCTCN2018111769-appb-000001
(其中，d为气溶胶粒径，γ为烟液表面张力，ρ为烟液密度，f为激励频率)得知，气溶胶粒径反比于激励频率的2/3次方。因此，与超声波雾化相比，声表面波雾化产生的气溶胶粒径更小，不易在口腔粘膜或舌面上残留，抽吸舒适性更强，香气也更加醇正细腻。
(2)声表面波通过衍射进入烟液的声能实现雾化，驱动功率一般为0.5W-3W，发热量小，加之压电基底具有一定的散热效果，即便连续抽吸时，热量也不易累积，温度不会快速上升，大大降低了高温热解的可能性。因此，声表面波雾化安全性能好，且有害物质的释放量也势必会比电热式雾化低得多。
(3)本发明的电子烟系统集成有导液腔，基于声表面波声致流效应，利用第一叉指换能器产生的行波模式声表面波提供驱动力来实现烟液主动泵送，并通过调节驱动功率来精确控制烟液导液速率，使其与雾化速率相适配，确保烟液的持续稳定泵送与及时充分雾化，解决了被动式导液存在的技术缺陷，避免了干烧现象发生，从而改善了抽吸品质、提升了用户体验。
(4)本发明的电子烟系统的第二叉指换能器52和第三叉指换能器53与所述T型纤维纸10不接触，通过第二叉指换能器和第三叉指换能器共同作用激发的驻波模式声表面波来实现对T型纤维纸上烟液液膜的非接触雾化。由于烟液与换能器不直接接触，不存在烟液在换能器上烧结粘附并进而影响换能器工作性能或使用寿命的问题。此外，驻波模式声表面波的能量基数大，对烟液的雾化能力强，因此本发明的电子烟系统在单位时间内能够产生足够大的烟雾量，用户能够迅速获得抽吸满足感。
附图说明
图1为本发明通过声表面波实现主动导液与非接触雾化的电子烟系统的结构示意图；
图2为本发明电子烟系统导液腔的局部放大图；
图3为本发明电子烟系统雾化腔的局部放大图。
附图标记说明：1.压电基底，2.导液腔，3.雾化腔，4.馈电端口，51.第一叉指换能器，52.第二叉指换能器，53.第三叉指换能器，6.储液仓，7.注液口，8.微流道，9.出液口，10.T型纤维纸，11.进气口，12.吸嘴，13.隔离板。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下将结合附图及实施例，对本发明作进一步详细说明。
本发明实施例的声表面波电子烟系统的结构示意图如图1所示，该系统包括压电基底1、导液腔2、雾化腔3和馈电端口4。所述导液腔2与所述雾化腔3设置于所述压电基底1上方，两腔体紧邻放置，中间设有隔离板13。导液腔和雾化腔的局部放大图分别见图2和图3。所述馈电端口4设置于所述压电基底1外侧，外接高频信号源。所述导液腔2由第一叉指换能器51、储液仓6、设于储液仓6顶部的注液口7以及与储液仓6连通的微流道8构成。所述雾化腔3底部设置有T型纤维纸10、第二叉指换能器52和第三叉指换能器53，雾化腔3的侧部及顶部分别设置有进气口11和吸嘴12。
所述第一叉指换能器51、储液仓6、微流道8、第二叉指换能器52、第三叉指换能器53和T型纤维纸10垂直紧密贴合于压电基底1表面。所述压电基底1由具有压电特性的材料构成，比如石英、压电陶瓷、钽酸锂或铌酸锂。优选Y切X 128.68°方向的铌酸锂，其厚度、机电耦合系数、温度系数和声表面波传播速度分别为0.5mm、5.5％、-72x10 -6/℃和3992m/s。所述第一叉指换能器51、第二叉指换能器52和第三叉指换能器53采用微加工工艺将具有手指交叉形状的铝、铜或金等金属薄膜溅镀沉积在经表面抛光后的压电基底上形成，并通过设于压电基底外侧的馈电端口4与高频信号源连接。所述储液仓6一侧放置有第一叉指换能器51，与之相对的另一侧与微流道8连通。储液仓6和微流道8的材料选用高硼硅玻璃或聚二甲基硅氧烷。所述第一叉指换能器51用于激发行波模式声表面波，为储液仓6内存放的烟液提供驱动力，并将烟液主动泵送至微流道8。所述T型纤维纸10通过出液口9嵌入到微流道8，用于均匀分散烟液并快速形成液膜，材料选用聚酯纤维或其他有机多孔材料。所述第二叉指换能器52和第三叉指换能器53相向放置于T型纤维纸两侧，在距离上形成一定相位，共同作用 产生的驻波模式声表面波将T型纤维纸上的烟液液膜雾化成气溶胶。
电子烟系统使用前，通过注液口7将烟液注入到储液仓6，直至烟液液面达到一定高度。在标准大气压下，由于烟液的表面张力和储液仓6内壁以及微流道8内壁的粘滞系数恒定，因此烟液不会自流。启动高频信号源，第一叉指换能器51、第二叉指换能器52和第三叉指换能器53通过馈电端口4施以交流电信号而被激励，换能器利用压电基底本身的逆压电效应将电信号转变为声信号，形成与外加信号同频率并沿压电基底表面传播的声表面波。当第一叉指换能器51产生的行波模式声表面波传播至储液仓6内时，声能衍射进入烟液，发生声流耦合效应，使得储液仓6与出液口9处形成压力差，储液仓6的压力场平衡被打破，烟液流经微流道8主动泵送至出液口9，并在T型纤维纸10上快速均匀分散形成烟液液膜。通过调节驱动功率可改变压力差，实现导液速率的量化控制，以确保烟液的持续稳定泵送与及时充分雾化。第二叉指换能器52和第三叉指换能器53激发的行波模式声表面波相向传播干涉叠加后会形成能量基数较大的驻波模式声表面波。当驻波模式声表面波与T型纤维纸10上的烟液液膜相接触时，其携带的能量会对液膜自由表面产生强烈扰动，使得液膜自身表面张力不足以保持几何形态的稳定，并破裂产生气溶胶。
以上所述仅为本发明的优先实施例，并非用于限制本发明。对于本领域的技术人员来说，在不付出创造性劳动的前提下，凡根据本发明揭露的技术方案或技术特征所作的任何修改、等同替换和改进等，皆应属于本发明的保护范围。

Claims (8)

  1. 一种声表面波电子烟系统，其特征在于，其包括压电基底(1)、导液腔(2)、雾化腔(3)以及馈电端口(4)；所述导液腔(2)与所述雾化腔(3)设置于所述压电基底(1)上表面，所述导液腔(2)与所述雾化腔(3)中间设有隔离板(13)；所述馈电端口(4)设置于所述压电基底(1)外侧；所述导液腔(2)包括第一叉指换能器(51)、储液仓(6)和微流道(8)，所述第一叉指换能器(51)和微流道(8)布置在所述储液仓(6)的两侧，所述储液仓(6)与所述微流道(8)相连通，所述储液仓(6)的顶部有注液口(7)；所述雾化腔(3)底部设置有通过出液口(9)嵌入到所述微流道(8)的T型纤维纸(10)、置于T型纤维纸(10)两侧且与所述T型纤维纸(10)不接触的第二叉指换能器(52)和第三叉指换能器(53)，所述雾化腔(3)侧部及顶部分别设置有进气口(11)和吸嘴(12)。
  2. 根据权利要求1所述的声表面波电子烟系统，其特征在于，所述第一叉指换能器(51)、储液仓(6)、微流道(8)、第二叉指换能器(52)、第三叉指换能器(53)和T型纤维纸(10)均与所述压电基底(1)表面紧密贴合。
  3. 根据权利要求1所述的声表面波电子烟系统，其特征在于，所述压电基底(1)材料为石英、压电陶瓷、钽酸锂或铌酸锂的一种。
  4. 根据权利要求3所述的声表面波电子烟系统，其特征在于，所述压电基底(1)材料为Y切X 128.68°方向的铌酸锂，其厚度、机电耦合系数、温度系数和声表面波的传播速度分别为0.5mm、5.5％、-72x10 -6/℃和3992m/s。
  5. 根据权利要求1所述的声表面波电子烟系统，其特征在于，所述第一叉指换能器(51)激发的行波模式声表面波将所述储液仓(6)内存放的烟液主动泵送至所述微流道(8)的出液口(9)；所述第二叉指换能器(52)和所述第三叉指换能器(53)共同作用产生的驻波模式声表面波将所述T型纤维纸(10)上的烟液液膜雾化成气溶胶。
  6. 根据权利要求1所述的声表面波电子烟系统，其特征在于，所述储液仓(6)和所述微流道(8)的材料为高硼硅玻璃或聚二甲基硅氧烷；所述T型纤维纸(10)为有机多孔材料。
  7. 根据权利要求1所述的声表面波电子烟系统，其特征在于，所述第一叉指换能器(51)、所述第二叉指换能器(52)和所述第三叉指换能器(53)的形状都是手指交叉形状，且为金属薄膜。
  8. 根据权利要求7所述的声表面波电子烟系统，其特征在于，所述金属薄膜为铝、铜或金薄膜。
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US20200397034A1 (en) 2020-12-24
JP6779384B2 (ja) 2020-11-04
EP3574778A1 (en) 2019-12-04
CN108030153A (zh) 2018-05-15
EP3574778B1 (en) 2021-07-21
RU2713347C1 (ru) 2020-02-04
KR20190125308A (ko) 2019-11-06
KR102152958B1 (ko) 2020-09-08

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