CN112120293A - Atomizer and contain its electron cigarette - Google Patents

Abstract

The atomizer with high atomization efficiency, low energy consumption and simple structure comprises an atomization area, an interdigital transducer, a liquid guide component and a control circuit; the interdigital transducer comprises a piezoelectric substrate and an interdigital electrode pair, wherein the interdigital electrode pair comprises two interdigital electrodes which are arranged in parallel, and beam areas formed by the interdigital electrodes on the piezoelectric substrate are mutually overlapped; the interdigital transducer at least comprises two interdigital electrode pairs, and overlapped beam areas formed on the piezoelectric substrate by the interdigital electrode pairs can be mutually overlapped to form a dot matrix focal area; the atomization area is positioned in the dot matrix focusing area and is used for atomizing liquid to be atomized; the liquid guide component is communicated with the liquid to be atomized and the atomization area; the control circuit includes a signal source and a signal amplification circuit for generating electromagnetic waves and exciting the interdigital transducer. The application also provides an electron cigarette that contains above-mentioned atomizer.

Description

Atomizer and contain its electron cigarette

Technical Field

The application relates to the field of electronic cigarettes, in particular to an atomizer and an electronic cigarette comprising the same.

Background

Besides being harmful to the health of smokers, smoking produces "second-hand smoke" which directly harms the health of people around, and even fires caused by cigarette ends are frequent. Although the hazards of smoking are well known to society, there are still a large number of smokers. Therefore, in addition to the conventional propaganda and regulation construction, it is very important to develop a technology capable of satisfying the needs of smokers and reducing the smoking harm, which is one of the research focuses in the tobacco industry at present, and the electronic smoking device is an important research direction.

At present, there are many brands of electronic cigarettes on the market, and the electric heating mode is still the main form of electronic cigarette atomized tobacco tar. The principle is that the tobacco tar in the oil storage device is dropped into the heating device through the oil guide pipe, the tobacco tar is evaporated and atomized to form steam through the high temperature generated by the heating device, and the steam is inhaled by a user along with the air. The main disadvantages of this approach are that high temperature can cause a series of complex decomposition, cracking, carbonization and dissolution reactions of the tobacco tar, heating element and oil conduit material, affect the quality of the suction, and present potential health risks. Therefore, normal temperature atomization technologies such as ultrasonic atomization and surface acoustic wave atomization are produced, but the normal temperature atomization technology in the prior art has the defects of complex structure, low energy utilization rate and the like.

Disclosure of Invention

In order to solve the problems, the small atomizer with high atomization efficiency, low energy consumption and simple structure comprises an atomization area, an interdigital transducer, a liquid guide component and a control circuit; the interdigital transducer comprises a piezoelectric substrate and an interdigital electrode pair, wherein the interdigital electrode pair comprises two interdigital electrodes which are arranged in parallel, and beam areas formed by the interdigital electrodes on the piezoelectric substrate are mutually overlapped; the interdigital transducer at least comprises two interdigital electrode pairs, and overlapped beam areas formed on the piezoelectric substrate by the interdigital electrode pairs can be mutually overlapped to form a dot matrix focal area; the atomization area is positioned in the dot matrix focusing area and is used for atomizing liquid to be atomized; the liquid guide component is communicated with the liquid to be atomized and the atomization area; the control circuit includes a signal source and a signal amplification circuit for generating electromagnetic waves and exciting the interdigital transducer.

In the present application, the interdigital electrode refers to a metal pattern shaped like a finger cross of two hands on a piezoelectric substrate as shown in fig. 1 and 2, and functions to convert an electromagnetic wave into a surface acoustic wave; each metal pattern of the interdigital electrode, which is shaped like a finger, is called an interdigital, and the distance between the interdigital electrodes is called an inter-interdigital distance; the interdigital electrode pair is formed by two interdigital electrodes which are parallel to each other, and beam areas formed by the two interdigital electrodes on the piezoelectric substrate are mutually overlapped (also referred to as "overlapped beam areas" hereinafter), the overlapped parts form standing waves (namely, a distribution state that two waves with the same frequency and opposite transmission directions are formed along the transmission line), and the overlapping can be complete overlapping or partial overlapping; the interdigital transducer is a functional whole formed by a piezoelectric substrate and interdigital electrodes arranged on the surface of the piezoelectric substrate.

The number of the piezoelectric substrates is not limited, or all the interdigital electrodes can be formed on different piezoelectric substrates respectively, and finally the purpose of the piezoelectric substrate is achieved through splicing all the piezoelectric substrates; alternatively, a plurality of interdigital transducers as described herein may be provided in a single atomizer, capable of forming multiple spot foci, and which may be used to atomize the same or different liquids. The application is also not limited to the number of interdigital electrode pairs, interdigital electrodes or fingers on the same piezoelectric substrate, that is, the lattice focusing can be formed by overlapping beam areas of a plurality of interdigital electrode pairs. Thus, it can also be seen that the number of pairs of interdigitated electrodes is at least two, but may be more. Moreover, even if the number of the interdigital electrodes is odd, that is, some interdigital electrodes may not have the functions described in the present application, or may be able to interfere with or weaken the above technical solution, the present invention also falls within the protection scope claimed in the present application.

In this solution, the fingers of the interdigital electrode must be "in-line" or "straight" and must not be curved. Although the focusing effect may be enhanced by adopting the arc interdigital electrode, the liquid drop is also gathered to the focus under the driving of the surface acoustic wave, so that the thickness of the liquid drop is increased, the power required by atomization is improved, and the atomization effect of the liquid drop atomization method cannot be achieved under the condition of lower power consumption.

The signal source is used for providing a sine wave signal with a required frequency for the interdigital transducer, and the frequency of the generated signal must be the same as the natural frequency of the interdigital transducer so as to improve the energy conversion rate; the signal amplifying circuit is used for improving the energy of the signal to enable the energy to reach a preset value, so that the acoustic surface wave for atomization is kept at a set strength.

According to the technical scheme, the control circuit generates the electromagnetic waves with the resonant frequency equal to that of the interdigital transducer, the interdigital transducer converts the electromagnetic waves into the surface acoustic waves with the same frequency, the arrangement of the interdigital transducer enables the surface acoustic waves transmitted along the piezoelectric substrate to form a dot matrix focus area in the atomization area, namely, a plurality of points in the atomization area are focused to form a remarkable vibration state, and the focus points are in a uniform dispersion state, so that the liquid film is prevented from moving and gathering. By adopting the technical scheme, the atomization difficulty is improved due to thickening of liquid drops, the vibration power is focused on a discrete dot matrix, the amplitude of the dot matrix focused part is enhanced, and the atomization efficiency is improved.

Further, the width of each finger of the interdigital electrode is 1/4 of the wavelength of the surface acoustic wave, the inter-finger distance is 1/4 of the wavelength of the surface acoustic wave, and the wavelength of the surface acoustic wave corresponds to the natural frequency of the interdigital electrode.

Furthermore, the liquid guiding component comprises a liquid guiding channel and a liquid seepage structure, one end of the liquid guiding channel is communicated with the liquid to be atomized, and the other end of the liquid guiding channel is communicated with the liquid seepage structure; the liquid seepage structure is arranged close to the atomization zone and used for guiding the liquid passing through the liquid guide channel into the atomization zone.

Furthermore, the working frequency of the interdigital transducer is 10 MHz-3 GHz.

Further, the signal source employs an ADF4350 chip.

Further, the signal amplifying circuit adopts PSA4-5043 radio frequency amplifier. By adopting the technical scheme, the energy of the signal is improved to 10dBm (10 decibel-milliwatt) so as to ensure that the surface acoustic wave for atomization is always kept at the set intensity.

Further, the material of the interdigital electrode is selected from one of aluminum, copper, gold and platinum.

Further, the material of the piezoelectric substrate is selected from one of quartz, lithium niobate, lithium tantalate or a silicon wafer.

The application also provides an electronic cigarette, which comprises the atomizer provided by any technical scheme or the atomizer formed by any combination of the technical schemes.

The beneficial effect of this application does:

dot matrix focusing is generated in the atomization area, so that the atomization efficiency is improved, and the energy utilization rate is improved;

the problems of uneven liquid drop distribution and increased power caused by increased liquid drop thickness are solved, so that the energy consumption is reduced;

the interdigital transducer is manufactured by a photoetching process, does not need to be assembled, has a simple structure, and can greatly reduce the volume compared with an ultrasonic atomizer.

Drawings

FIG. 1 shows a schematic view of an atomizer according to an embodiment of the present application;

FIG. 2 shows a schematic diagram of the embodiment shown in FIG. 1 forming a focal region of a lattice.

Description of the component numbering

100 an atomizer;

10 an atomization zone; 11 lattice focusing area; 12 focusing point; 13 overlapping beam zones;

a 20 interdigital transducer; 21 a piezoelectric substrate; 22 pairs of interdigitated electrodes; 22a, 22b interdigitated electrodes;

30 a liquid guiding component; 31 a drainage channel; 32 a liquid-permeable structure;

40 a control circuit; 41 a signal source; 42 signal amplification circuit.

Detailed Description

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. While the description of the present application will be described in conjunction with the preferred embodiments, it is not intended to limit the features of the present invention to that embodiment. Rather, the invention has been described in connection with embodiments for the purpose of covering alternatives and modifications as may be extended based on the claims of the present application. In the following description, numerous specific details are included to provide a thorough understanding of the present application. The present application may be practiced without these particulars. Moreover, some of the specific details have been omitted from the description in order to avoid obscuring or obscuring the focus of the present application. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiments, it should also be noted that the terms "disposed," "connected," and the like are to be construed broadly unless otherwise expressly specified or limited. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 schematically illustrates anebulizer 100 of one embodiment of the application, thenebulizer 100 comprising anebulizing area 10, aninterdigital transducer 20, aliquid directing member 30, and acontrol circuit 40.

Theinterdigital transducer 20 comprises apiezoelectric substrate 21 and aninterdigital electrode pair 22, wherein theinterdigital electrode pair 22 comprises twointerdigital electrodes 22a and 22b which are arranged in parallel, and beam areas formed by theinterdigital electrodes 22a and 22b on thepiezoelectric substrate 21 are mutually overlapped; theinterdigital transducer 20 at least comprises twointerdigital electrode pairs 22, and the overlappingbeam areas 13 formed on thepiezoelectric substrate 21 by theinterdigital electrode pairs 22 can be mutually overlapped to form a dot matrixfocal area 11. Theatomization zone 10 is located in the dot matrixfocal region 11, theinterdigital transducer 20 can convert electromagnetic waves into surface acoustic waves with the same frequency, and the surface acoustic waves are transmitted into theatomization zone 10 along thepiezoelectric substrate 21 to atomize liquid in theatomization zone 10. In any of the embodiments of the present application, the width of each finger of theinterdigital electrode 22 can be set to 1/4 for the surface acoustic wave wavelength, and the inter-finger spacing can be set to 1/4 for the surface acoustic wave wavelength. In this embodiment, each finger has a width of 5 μm and a finger pitch of 5 μm.

The liquid guidingcomponent 30 is communicated with the liquid to be atomized and theatomization area 10. In the embodiment shown in fig. 1, the liquid guidingcomponent 30 comprises a liquid guidingchannel 31 and a liquid permeatingstructure 32, wherein one end of theliquid guiding channel 31 is communicated with the liquid to be atomized, and the other end is communicated with theliquid permeating structure 32; the liquid-permeable structure 32 is disposed closer to the atomizingarea 10 than the liquid-guidingpassage 31 for guiding the liquid passing through the liquid-guidingpassage 31 into the atomizingarea 10. In any embodiment of the present application, the liquid-permeable structure 32 may be embodied as a groove etched on thepiezoelectric substrate 21, which groove is capable of accurately guiding the liquid to be atomized into theatomization region 10 and avoiding the interdigital electrodes. Also, the fluid-directingmember 30 may further include a valve for controlling the amount of fluid entering the weepstructure 32.

Thecontrol circuit 40 includes asignal source 41 and asignal amplifying circuit 42, and thesignal source 41 and thesignal amplifying circuit 42 can simultaneously excite theinterdigital transducer 20, so that the atomization efficiency is further improved through the latticefocal region 11 formed by theinterdigital transducer 20 during operation. In this embodiment, thesignal source 41 employs an ADF4350 chip for supplying theinterdigital transducer 20 with a sine wave signal of a desired frequency, for example, a natural frequency of 200MHz, and thesignal source 41 generates a signal having the same frequency as the natural frequency of theinterdigital transducer 20, so as to improve the energy conversion rate. Thesignal amplification circuit 42 employs a PSA4-5043 radio frequency amplifier whose function is to boost the energy of the signal to about 10dBm to ensure that the surface acoustic wave used for atomization remains at this set intensity at all times.

Referring to fig. 2, thenebulizer 100 provided by the present application generates an electromagnetic wave signal with a preset frequency through thesignal source 41 and thesignal amplifying circuit 42, converts the electromagnetic wave signal into a surface acoustic wave through the arrangement of theinterdigital transducer 20, and the surface acoustic wave propagates along the surface of thepiezoelectric substrate 21 and forms the latticefocal region 11. The liquid to be atomized enters theatomization area 10 through theliquid guide part 30, and a remarkable vibration state is formed at a plurality of focusingpoints 12 of thearray focusing area 11, so that atomization is realized. Because the focusingpoint 12 formed by theatomizer 100 in theatomizing area 10 is in a uniform dispersion state, the movement and aggregation of the liquid film can not be caused, which not only avoids the increase of the atomizing difficulty caused by the thickening of the liquid drops, but also focuses the power to a discrete dot matrix, enhances the amplitude of the dotmatrix focusing area 11 and improves the atomizing efficiency.

In any of the embodiments of the present application, different operating frequencies of the interdigital transducer can be selected according to the properties of the liquid to be atomized, and the operating frequency can range from 10MHz to 3GHz, and further can range from 100MHz to 1 GHz. The material of theinterdigital electrode 22 is selected from one of aluminum, copper, gold and platinum, and the material of thepiezoelectric substrate 21 is selected from one of quartz, lithium niobate, lithium tantalate or a silicon wafer. In this embodiment, the operating frequency of theinterdigital transducer 20 is 200MHz, the material of theinterdigital electrode 22 is aluminum metal, and the material of thepiezoelectric substrate 21 is 36 ° LiTaO₃。

The present application further provides an electronic cigarette, which includes theatomizer 100 formed according to any one of the technical solutions or any combination of the technical solutions of the present application, and in particular, theatomizer 100 provided in the foregoing embodiments and drawings.

While the present application has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the present application, and the present application is not intended to be limited to these details. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the present application.

Claims (7)

Translated fromChinese

1.一种雾化器，其特征在于，包括雾化区、叉指换能器、导液部件，以及控制电路；其中，1. an atomizer, is characterized in that, comprises atomization zone, interdigital transducer, liquid-conducting part, and control circuit; Wherein,所述叉指换能器包括压电基底和叉指电极对，所述叉指电极对包括两个平行设置的叉指电极，且所述叉指电极在压电基底上形成的波束区相互重叠；所述叉指换能器至少包括两个叉指电极对，且各所述叉指电极对在所述压电基底上形成的所述波束区能够相互叠加形成点阵聚焦区；The interdigital transducer includes a piezoelectric substrate and an interdigital electrode pair, the interdigital electrode pair includes two interdigital electrodes arranged in parallel, and the beam areas formed by the interdigital electrodes on the piezoelectric substrate overlap each other The interdigital transducer includes at least two interdigital electrode pairs, and the beam areas formed by each of the interdigital electrode pairs on the piezoelectric substrate can be superimposed on each other to form a lattice focus area;所述雾化区位于所述点阵聚焦区内，用于雾化待雾化液体；The atomization area is located in the lattice focusing area, and is used for atomizing the liquid to be atomized;所述导液部件连通所述待雾化液体以及所述雾化区；The liquid guiding component communicates with the liquid to be atomized and the atomization area;所述控制电路包括信号源和信号放大电路，用于产生电磁波并激发所述叉指换能器。The control circuit includes a signal source and a signal amplification circuit for generating electromagnetic waves and exciting the interdigital transducer.2.如权利要求1所述的雾化器，其特征在于，各所述叉指电极的每个叉指的宽度为声表面波波长的1/4，各所述叉指电极的叉指间距为声表面波波长的1/4，所述声表面波波长是指所述叉指电极的固有频率对应的波长。2. The atomizer according to claim 1, wherein the width of each interdigital electrode of each interdigital electrode is 1/4 of the wavelength of the surface acoustic wave, and the interdigital spacing of each interdigital electrode is is 1/4 of the wavelength of the surface acoustic wave, and the wavelength of the surface acoustic wave refers to the wavelength corresponding to the natural frequency of the interdigital electrode.3.如权利要求1所述的雾化器，其特征在于，所述导液部件包括：3. The atomizer of claim 1, wherein the liquid-guiding component comprises:导液通道，所述导液通道一端与待雾化液体连通，另一端与渗液结构连通；a liquid guiding channel, one end of the liquid guiding channel is communicated with the liquid to be atomized, and the other end is communicated with the liquid seepage structure;所述渗液结构靠近所述雾化区设置，用于将经过所述导液通道的液体导入所述雾化区。The liquid permeation structure is disposed close to the atomization area, and is used for introducing the liquid passing through the liquid guiding channel into the atomization area.4.如权利要求1所述的雾化器，其特征在于，所述叉指换能器的工作频率为10MHz～3GHz。4 . The atomizer according to claim 1 , wherein the operating frequency of the interdigital transducer is 10MHz˜3GHz. 5 .5.如权利要求1所述的雾化器，其特征在于，所述叉指电极的材料选自于铝、铜、金、铂中的一种。5. The atomizer according to claim 1, wherein the material of the interdigital electrode is selected from one of aluminum, copper, gold, and platinum.6.如权利要求1所述的雾化器，其特征在于，所述压电基底的材料选自于石英、铌酸锂、钽酸锂或硅片中的一种。6 . The atomizer according to claim 1 , wherein the material of the piezoelectric substrate is selected from one of quartz, lithium niobate, lithium tantalate or silicon wafer. 7 .7.一种电子烟，其特征在于，包括权利要求1～6任一项所述的雾化器。7. An electronic cigarette, characterized by comprising the atomizer according to any one of claims 1 to 6.

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