CN208354611U - A kind of heating device of electronic cigarette - Google Patents
A kind of heating device of electronic cigarette Download PDFInfo
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- CN208354611U CN208354611U CN201821041934.XU CN201821041934U CN208354611U CN 208354611 U CN208354611 U CN 208354611U CN 201821041934 U CN201821041934 U CN 201821041934U CN 208354611 U CN208354611 U CN 208354611U
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- glass layer
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Abstract
The utility model proposes a kind of heating devices of electronic cigarette, including ceramic substrate, being uniformly provided with first thereon has lead or unleaded amorphous glass layer, have on lead or unleaded amorphous glass layer first, heating resistor band is successively arranged along its length direction, gold electrode and silver electrode, the heating material that heating resistor band uses has constant TCR value, heating resistor band is in preset figure and is uniformly distributed, the both ends of heating resistor band are connected with two gold electrodes respectively, the end of each gold electrode is connected with corresponding silver electrode respectively, silver electrode is connected with power supply circuit, it is also connected with thermometric and temperature control circuit, power supply circuit includes heating power supply and control switch, control switch is controlled by thermometric and temperature control circuit；Second is equipped with above heating resistor band and part gold electrode lead or unleaded amorphous glass layer.Above-mentioned apparatus is able to achieve accurate temperature controlling, uniformly heated function, is avoided that the excessively high caused heating device of temperature destroys, has the function of low-temperature prewarming.
Description
Technical field
The utility model relates to heating device field more particularly to a kind of heating devices of electronic cigarette.
Background technique
With the rapid development of electronic cigarette, tobacco tar type electronic cigarette technology is favored by more and more electronic cigarette businessmans.It adds
Hot mode is varied, but much all there is various deficiencies.Simultaneously without effective temperature control means in heating process, this will cause
All there is potential risk in the damage of heating device high temperature or even electronic cigarette ontology.
Related art is as follows:
Circumferential heated type baking needle and electronic cigarette of the CN201720885413- for electronic cigarette disclose one kind and are coated with iron fluorine
The heated type of dragon toasts needle, and baking needle, which is placed in, to be fixed in support bracket fastened ceramics seat.
A kind of sheet heating electronic cigarette of CN201610729429- discloses a kind of sheet heating electronic cigarette, including device
Tool and cigarette, heating part include insertion supporter, the heating element of sheet.
CN201711420125- electronic cigarette and its heating device disclose a kind of heating device, by electrode by heating electric
Resistance body is connect with the external world, while by setting temperature measuring element, realizing temperature control.
CN201721377734- electronic cigarette heating rod discloses a kind of heating heated in main body to smoke grenade
Stick.
The above-mentioned prior art or have that baking needle is easily broken, and the heating sheet service life is short and uneven heating, without temperature control；Or exists and need
Increase temperature measuring element realize the complex controls means such as temperature control and temperature control not in time, it is inaccurate the disadvantages of.
Utility model content
In order to solve the problems in the existing technology, the utility model proposes a kind of heating devices of electronic cigarette, lead to
The temperature thermal characteristics that the heating resistor of heating device itself has is crossed, so that only passing through the resistance value energy of measurement heating resistor
Judge the current temperature of heating device and carries out temperature control.
To achieve the goals above, the utility model proposes a kind of heating device of electronic cigarette, including ceramic substrate,
First is uniformly provided on the ceramic substrate lead or unleaded amorphous glass layer, has lead or unleaded noncrystalline glass described first
On glass layer, along first have the length direction of lead or unleaded amorphous glass layer be successively arranged heating resistor band, gold electrode and
Silver electrode, wherein the heating material that the heating resistor band uses has constant TCR value, the heating resistor band is in
Preset figure, and be evenly distributed on first and have on lead or unleaded amorphous glass layer, the both ends of the heating resistor band
Be connected respectively with two gold electrodes, the end of each gold electrode is connected with corresponding silver electrode respectively, the silver electrode with
Power supply circuit is connected, and the silver electrode is also connected with thermometric and temperature control circuit, wherein the power supply circuit includes heating electricity
Source and control switch, the control switch are powered for controlling whether for heating resistor band, and the control switch is controlled by
The thermometric and temperature control circuit；Second is equipped with above the heating resistor band and part gold electrode lead or unleaded noncrystalline
Glassy layer, described second, which has the thermal conductivity of lead or unleaded amorphous glass layer to be greater than first, lead or unleaded amorphous glass layer
Thermal conductivity.
Preferably, described first has the thermal conductivity of lead or unleaded amorphous glass layer for 0.2 W/ (mK) ~ 0.8W/
(mK), described second has the thermal conductivity of lead or unleaded amorphous glass layer for 1 W/ (mK) ~ 3W/ (mK).
Preferably, the TCR value is 500 ppm/ DEG C ~ 3000ppm/ DEG C.
Preferably, the heating resistor band is made of platinum group resistance slurry.
Preferably, the thermometric and temperature control circuit include power supply, and the power supply is connected to model through first resistor
The reference pole of the cathode of the voltage-stabiliser tube of TL431, the plus earth of the voltage-stabiliser tube, the voltage-stabiliser tube is connected to its cathode, from institute
Second resistance and the 4th resistance are drawn in the reference pole for stating voltage-stabiliser tube respectively, draw third electricity from the other end of the second resistance
Resistance ground connection, also draws in the two-way operational amplifier that the 6th resistance is connected to model LM158 from the other end of the second resistance
First via operational amplifier 2 pins；Heating resistor ground connection is drawn from the other end of the 4th resistance, from the described 4th
The other end of resistance also draws 3 pins that the 5th resistance is connected to first via operational amplifier；The 2 of the first via operational amplifier
Pin is also connected to its 1 pin through the 7th resistance, and 1 pin of the first via operational amplifier is connected to model through the 8th resistance
For 5 pins of the second road operational amplifier in the two-way operational amplifier of LM158, the 6 of second road operational amplifier are drawn
Foot is also connected to its 7 pin through the tenth resistance through the 9th resistance eutral grounding, 6 pin, and 7 pins of second road operational amplifier connect
It is connected to the ADC pin of the single-chip microcontroller of model C8051F, the GND pin ground connection of the single-chip microcontroller, the VCC pin of the single-chip microcontroller
Power supply is connect, the computer heating control pin output control signal of the single-chip microcontroller controls the control switch in the power supply circuit.
Preferably, the 3rd resistor uses adjustable resistance.
The beneficial effect of the program of the utility model is that the heating device of above-mentioned electronic cigarette is used with positive or negative temperature
The resistance material for spending coefficient makes heating resistor band, can be realized accurate temperature controlling, uniformly heated function, can be avoided temperature
Heating device caused by excessively high, which destroys, even causes open fire etc. to endanger, while having the function of low-temperature prewarming, can make electronics
The service life of cigarette extends.
Detailed description of the invention
Fig. 1 shows the structural schematic diagram of the heating device of electronic cigarette involved in the utility model.
Fig. 2 shows the schematic perspective views of the heating device of electronic cigarette involved in the utility model.
Fig. 3 shows thermometric involved in the utility model and temperature control circuit schematic diagram.
Fig. 4 shows the structural schematic diagram of the electronic cigarette comprising heating device involved in the utility model.
Appended drawing reference: 1- ceramic substrate, 2- first have lead or unleaded amorphous glass layer, 3- heating resistor band, 4- gold
Electrode, 5- silver electrode, 6- second have lead or a unleaded amorphous glass layer, 7- electronic cigarette ontology, 8- control circuit, 9- heating sheet,
The dedicated cigarette of 10-.
Specific embodiment
Specific embodiment of the present utility model is further described with reference to the accompanying drawing.
As shown in Figure 1, 2, the heating device of electronic cigarette involved in the utility model includes heating sheet and corresponding control
Circuit processed, wherein the control circuit includes power supply circuit and thermometric and temperature control circuit, the heating sheet includes ceramic substrate 1,
The ceramic substrate 1 uses zirconium oxide material, with a thickness of 0.2mm ~ 0.5mm, in order to keep dedicated cigarette insertion more convenient, heat transfer
Also more efficient, in the present embodiment, one end that the ceramic substrate 1 is in contact with dedicated cigarette is in cusp-shaped；In the ceramics
First is uniformly provided on substrate 1 lead or a unleaded amorphous glass layer 2, and described first has lead or unleaded amorphous glass layer 2
Thermal conductivity is 0.2 W/ (mK) ~ 0.8W/ (mK), is had on lead or unleaded amorphous glass layer 2 described first, along first
There is the length direction of lead or unleaded amorphous glass layer 2 to be successively arranged heating resistor band 3, gold electrode 4 and silver electrode 5, wherein
The heating material that the heating resistor band 3 uses has constant TCR(temperature-coefficient of electrical resistance) value, in the present embodiment,
The TCR value is 500 ppm/ DEG C ~ 3000ppm/ DEG C, and the heating resistor band 3 is made of platinum group resistance slurry, or is adopted
It is made of other resistance materials with similar thermal characteristics, that is, resistance and temperature are in positive or negative temperature coefficient relationship.
The heating resistor band 3 is in preset figure, and is evenly distributed on first and has on lead or unleaded amorphous glass layer 2, with
Just it realizes and is evenly heated.The both ends of the heating resistor band 3 are connected with two gold electrodes 4 respectively, the end of each gold electrode 4
End be connected respectively with corresponding silver electrode 5, the silver electrode 5 is connected with power supply circuit, the silver electrode 5 also with thermometric and
Temperature control circuit is connected, wherein the power supply circuit includes heating power supply and control switch, the control switch is for controlling
It whether is that heating resistor band 3 is powered, the control switch is controlled by the thermometric and temperature control circuit.In the heating resistor
Second is equipped with above band 3 and part gold electrode 4 lead or unleaded amorphous glass layer 6, and described second has lead or unleaded noncrystalline
The thermal conductivity of glassy layer 6 is 1 W/ (mK) ~ 3W/ (mK).
The circuit diagram of the specific thermometric and temperature control circuit is as shown in figure 3, the thermometric and temperature control circuit include power supply
VCC, the power supply VCC are connected to the cathode of the voltage-stabiliser tube Z1 of model TL431, the sun of the voltage-stabiliser tube Z1 through first resistor R1
Pole is grounded GND, and the reference pole of the voltage-stabiliser tube Z1 is connected to its cathode, draws second respectively from the reference pole of the voltage-stabiliser tube Z1
Resistance R2 and the 4th resistance R4 draws 3rd resistor R3 ground connection from the other end of the second resistance R2, from second electricity
The other end of resistance R2 also draws the first via operation amplifier that the 6th resistance R6 is connected in the two-way operational amplifier of model LM158
2 pins of device A1；Heating resistor Rt ground connection is drawn from the other end of the 4th resistance R4, from the another of the 4th resistance R4
Also draw 3 pins that the 5th resistance R5 is connected to first via operational amplifier A1 in one end；Draw the 2 of the first via operational amplifier A1
Foot is also connected to its 1 pin through the 7th resistance R7, and 1 pin of the first via operational amplifier A1 is connected to through the 8th resistance R8
5 pins of the second road operational amplifier A2 in the two-way operational amplifier of model LM158, second road operational amplifier
6 pins of A2 are grounded GND through the 9th resistance R9, which is also connected to its 7 pin through the tenth resistance R10, and second road transport is calculated
7 pins of amplifier A2 are connected to the ADC pin of the single-chip microcontroller IC1 of model C8051F, the GND pin of the single-chip microcontroller IC1
It is grounded GND, the VCC pin of the single-chip microcontroller IC1 connects power supply VCC, the computer heating control pin output control letter of the single-chip microcontroller IC1
Control switch in number control power supply circuit.
Second resistance R2,3rd resistor R3, the 4th resistance R4 and heating resistor in the thermometric and temperature control circuit
Rt constitutes measuring bridge, and in order to guarantee the stability of bridge output voltage signal, the input voltage of electric bridge passes through voltage-stabiliser tube Z1
Pressure stabilizing, the differential signal obtained from electric bridge are input to single-chip microcontroller IC1 after amplifying by two stage amplifer.The 3rd resistor R3 institute of electric bridge
Bridge arm use adjustable resistance, pass through the size for adjusting the adjustable differential voltage signal for being input to amplifier of 3rd resistor R3.
In the present embodiment, amplifying circuit uses LM158 two-way operational amplifier, and the excessively high bring of single-stage amplification factor is non-thread in order to prevent
Property error, amplifying circuit exports the voltage of about 0.48V or so to single-chip microcontroller IC1, the monolithic after amplifying 30 times using two-stage
Machine IC1 is first AD converted input voltage, and whether the value after judging conversion later is more than preset threshold value, is tied according to judgement
The corresponding control signal of computer heating control pin output of fruit, the single-chip microcontroller IC1 controls the control switch in the power supply circuit.
In the present embodiment, the heating resistor band 3 is made of platinum group resistance slurry, and platinum group resistance temperature reaches
Corresponding resistance value is about in 1.92 Ω or so at 250 DEG C, by the thermometric and temperature control circuit, by AD conversion in single-chip microcontroller IC1
Value afterwards is compared with threshold value, if the value after AD conversion is greater than threshold value, illustrates that the resistance value of heating resistor Rt is greater than 1.92
Ω, the temperature for further relating to heating resistor band 3 at this time is more than 250 DEG C, the computer heating control pin output of the single-chip microcontroller IC1
The control signal for stopping heating controlling the control switch in the power supply circuit.If the value after AD conversion is less than threshold value, illustrate
The resistance value of heating resistor Rt further relates to the temperature of heating resistor band 3 at this time lower than 250 DEG C less than 1.92 Ω, described
The computer heating control pin of single-chip microcontroller IC1 exports control signal for continuing heating and controls control switch in the power supply circuit.
The heating device of electronic cigarette involved in the utility model uses the resistance material system with positive or negative temperature coefficient
Make heating resistor band, can be realized accurate temperature controlling, uniformly heated function, can be avoided the excessively high caused heating device of temperature
It destroys and open fire etc. is even caused to endanger, while having the function of low-temperature prewarming, the service life of electronic cigarette can be made to extend.
Position and application of the heating device in electronic cigarette involved in specific the utility model are as shown in figure 4, described
Heating sheet 9 is arranged in the front end of electronic cigarette ontology 7 and is connected with control circuit 8, and the length of the heating sheet 9 is generally on the left side 19mm
The dedicated insertion of cigarette 10 of electronic cigarette is equipped in the electronic cigarette ontology 7 of heating sheet 9, when specifically used wherein described special by the right side
With the length of cigarette 10 probably in 45mm or so, the dedicated cigarette 10 is inserted into the depth about 25mm in electronic cigarette ontology 7
Left and right, the depth contacted with heating sheet 9 are 15mm or so, when in use, not be rotated at random dedicated cigarette 10, in order to avoid cause to add
The strain of backing 9.
Claims (6)
1. a kind of heating device of electronic cigarette, it is characterised in that: including ceramic substrate, is uniformly provided on the ceramic substrate
One has lead or unleaded amorphous glass layer, has on lead or unleaded amorphous glass layer described first, has lead or nothing along first
The length direction of lead amorphous glass layer is successively arranged heating resistor band, gold electrode and silver electrode, wherein the heating resistor
The heating material that body band uses has constant TCR value, and the heating resistor band is in preset figure, and is uniformly distributed
Having on lead or unleaded amorphous glass layer first, the both ends of the heating resistor band are connected with two gold electrodes respectively,
The end of each gold electrode is connected with corresponding silver electrode respectively, and the silver electrode is connected with power supply circuit, the silver electricity
Pole is also connected with thermometric and temperature control circuit, wherein the power supply circuit includes heating power supply and control switch, the control
Switch is powered for controlling whether for heating resistor band, and the control switch is controlled by the thermometric and temperature control circuit；Institute
Stating above heating resistor band and part gold electrode has lead or unleaded amorphous glass layer equipped with second, and described second has lead or nothing
The thermal conductivity of lead amorphous glass layer is greater than the first thermal conductivity for having lead or unleaded amorphous glass layer.
2. the heating device of electronic cigarette according to claim 1, it is characterised in that: described first has lead or unleaded noncrystalline
The thermal conductivity of glassy layer is 0.2 W/ (mK) ~ 0.8W/ (mK), and described second has the thermal conductivity of lead or unleaded amorphous glass layer
Rate is 1 W/ (mK) ~ 3W/ (mK).
3. the heating device of electronic cigarette according to claim 1, it is characterised in that: the TCR value is 500 ppm/ DEG C ~
3000ppm/℃。
4. the heating device of electronic cigarette according to claim 1, it is characterised in that: the heating resistor band uses platinum group
Resistance slurry is made.
5. the heating device of electronic cigarette according to claim 1, it is characterised in that: the thermometric and temperature control circuit include electricity
Source, the power supply are connected to the cathode of the voltage-stabiliser tube of model TL431, the plus earth of the voltage-stabiliser tube, institute through first resistor
The reference pole for stating voltage-stabiliser tube is connected to its cathode, draws second resistance and the 4th electricity respectively from the reference pole of the voltage-stabiliser tube
Resistance, draws 3rd resistor ground connection from the other end of the second resistance, also draws the 6th electricity from the other end of the second resistance
Hinder 2 pins of the first via operational amplifier being connected in the two-way operational amplifier of model LM158；From the 4th resistance
The other end draws heating resistor ground connection, also draws the 5th resistance from the other end of the 4th resistance and is connected to first via operation and puts
3 pins of big device；2 pins of the first via operational amplifier are also connected to its 1 pin, first road transport through the 7th resistance
1 pin for calculating amplifier is connected to the second road operation amplifier in the two-way operational amplifier of model LM158 through the 8th resistance
5 pins of device, for 6 pins of second road operational amplifier through the 9th resistance eutral grounding, which is also connected to it through the tenth resistance
7 pins, 7 pins of second road operational amplifier are connected to the ADC pin of the single-chip microcontroller of model C8051F, the monolithic
The GND pin of machine is grounded, and the VCC pin of the single-chip microcontroller connects power supply, the computer heating control pin output control letter of the single-chip microcontroller
Control switch in number control power supply circuit.
6. the heating device of electronic cigarette according to claim 5, it is characterised in that: the 3rd resistor uses adjustable electric
Resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821041934.XU CN208354611U (en) | 2018-07-03 | 2018-07-03 | A kind of heating device of electronic cigarette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821041934.XU CN208354611U (en) | 2018-07-03 | 2018-07-03 | A kind of heating device of electronic cigarette |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208354611U true CN208354611U (en) | 2019-01-11 |
Family
ID=64924142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821041934.XU Active CN208354611U (en) | 2018-07-03 | 2018-07-03 | A kind of heating device of electronic cigarette |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208354611U (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109600867A (en) * | 2019-01-16 | 2019-04-09 | 安克创新科技股份有限公司 | A kind of ceramic heating element and the device including the ceramic heating element |
| CN110495641A (en) * | 2019-07-03 | 2019-11-26 | 筑思有限公司 | Heater and apparatus for baking |
| JP6728509B1 (en) * | 2020-03-05 | 2020-07-22 | 日本たばこ産業株式会社 | Power supply unit for aerosol inhalers |
| JP6785391B1 (en) * | 2020-04-02 | 2020-11-18 | 日本たばこ産業株式会社 | Power supply unit for aerosol aspirators and aerosol aspirators |
| EP3744190A1 (en) * | 2019-05-31 | 2020-12-02 | Japan Tobacco Inc. | Control device for aerosol inhalation device |
| EP3811799A1 (en) * | 2019-10-24 | 2021-04-28 | Japan Tobacco Inc. | Power supply unit for aerosol inhaler |
| CN112790441A (en) * | 2020-12-30 | 2021-05-14 | 深圳市基克纳科技有限公司 | Heating assembly of atomizing device |
| WO2021098408A1 (en) * | 2019-11-18 | 2021-05-27 | 深圳麦克韦尔科技有限公司 | Modification layer on surface of ceramic substrate and preparation method therefor, ceramic heating body and electronic atomization device |
| CN113100482A (en) * | 2021-05-19 | 2021-07-13 | 王静怡 | Heating device of electronic cigarette |
| CN113349464A (en) * | 2020-03-05 | 2021-09-07 | 日本烟草产业株式会社 | Power supply unit for aerosol inhaler |
| CN113466563A (en) * | 2021-07-30 | 2021-10-01 | 深圳市汇创达科技股份有限公司 | Device for testing resistance of multi-path resistor |
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| CN109600867A (en) * | 2019-01-16 | 2019-04-09 | 安克创新科技股份有限公司 | A kind of ceramic heating element and the device including the ceramic heating element |
| US11166493B2 (en) | 2019-05-31 | 2021-11-09 | Japan Tobacco Inc. | Control device for aerosol inhalation device and aerosol inhalation device |
| US11969023B2 (en) | 2019-05-31 | 2024-04-30 | Japan Tobacco Inc. | Control device for aerosol inhalation device and aerosol inhalation device |
| EP3744190A1 (en) * | 2019-05-31 | 2020-12-02 | Japan Tobacco Inc. | Control device for aerosol inhalation device |
| US11490661B2 (en) | 2019-05-31 | 2022-11-08 | Japan Tabacco Inc. | Control device for aerosol inhalation device and aerosol inhalation device |
| CN110495641A (en) * | 2019-07-03 | 2019-11-26 | 筑思有限公司 | Heater and apparatus for baking |
| US11213072B2 (en) | 2019-10-24 | 2022-01-04 | Japan Tobacco Inc. | Power supply unit for aerosol inhaler |
| EP3811799A1 (en) * | 2019-10-24 | 2021-04-28 | Japan Tobacco Inc. | Power supply unit for aerosol inhaler |
| WO2021098408A1 (en) * | 2019-11-18 | 2021-05-27 | 深圳麦克韦尔科技有限公司 | Modification layer on surface of ceramic substrate and preparation method therefor, ceramic heating body and electronic atomization device |
| US11311053B2 (en) | 2020-03-05 | 2022-04-26 | Japan Tobacco Inc. | Power supply unit for aerosol inhaler |
| CN113349465A (en) * | 2020-03-05 | 2021-09-07 | 日本烟草产业株式会社 | Power supply unit for aerosol inhaler |
| EP3876666A1 (en) * | 2020-03-05 | 2021-09-08 | Japan Tobacco Inc. | Power supply unit for aerosol inhaler |
| EP3874974A1 (en) * | 2020-03-05 | 2021-09-08 | Japan Tobacco Inc. | Power supply unit for aerosol inhaler |
| JP2021136941A (en) * | 2020-03-05 | 2021-09-16 | 日本たばこ産業株式会社 | Power supply unit of aerosol suction device |
| JP2021136942A (en) * | 2020-03-05 | 2021-09-16 | 日本たばこ産業株式会社 | Power supply unit for aerosol inhaler |
| CN113349464A (en) * | 2020-03-05 | 2021-09-07 | 日本烟草产业株式会社 | Power supply unit for aerosol inhaler |
| US11134721B2 (en) | 2020-03-05 | 2021-10-05 | Japan Tobacco Inc. | Power supply unit for aerosol inhaler |
| JP6728509B1 (en) * | 2020-03-05 | 2020-07-22 | 日本たばこ産業株式会社 | Power supply unit for aerosol inhalers |
| CN113508933A (en) * | 2020-04-02 | 2021-10-19 | 日本烟草产业株式会社 | Aerosol inhaler and power supply unit for aerosol inhaler |
| US11160313B2 (en) | 2020-04-02 | 2021-11-02 | Japan Tobacco Inc. | Aerosol inhaler and power supply unit of aerosol inhaler |
| EP3890433A1 (en) * | 2020-04-02 | 2021-10-06 | Japan Tobacco Inc. | Aerosol inhaler and power supply unit of aerosol inhaler |
| RU2760406C1 (en) * | 2020-04-02 | 2021-11-24 | Джапан Тобакко Инк. | Aerosol inhaler and aerosol inhaler power supply |
| JP6785391B1 (en) * | 2020-04-02 | 2020-11-18 | 日本たばこ産業株式会社 | Power supply unit for aerosol aspirators and aerosol aspirators |
| CN112790441A (en) * | 2020-12-30 | 2021-05-14 | 深圳市基克纳科技有限公司 | Heating assembly of atomizing device |
| CN113100482A (en) * | 2021-05-19 | 2021-07-13 | 王静怡 | Heating device of electronic cigarette |
| CN113466563A (en) * | 2021-07-30 | 2021-10-01 | 深圳市汇创达科技股份有限公司 | Device for testing resistance of multi-path resistor |
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