EP4349192A1 - Aerosolerzeugungsvorrichtung, heizer dafür und herstellungsverfahren - Google Patents

Aerosolerzeugungsvorrichtung, heizer dafür und herstellungsverfahren Download PDF

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Publication number
EP4349192A1
EP4349192A1 EP22815362.3A EP22815362A EP4349192A1 EP 4349192 A1 EP4349192 A1 EP 4349192A1 EP 22815362 A EP22815362 A EP 22815362A EP 4349192 A1 EP4349192 A1 EP 4349192A1
Authority
EP
European Patent Office
Prior art keywords
resistor heating
shell
heating element
generation device
heater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22815362.3A
Other languages
English (en)
French (fr)
Inventor
Jian Wu
Zhongli XU
Yonghai LI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen FirstUnion Technology Co Ltd
Original Assignee
Shenzhen FirstUnion Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen FirstUnion Technology Co Ltd filed Critical Shenzhen FirstUnion Technology Co Ltd
Publication of EP4349192A1 publication Critical patent/EP4349192A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/04—Waterproof or air-tight seals for heaters
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/145—Carbon only, e.g. carbon black, graphite
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/52—Apparatus or processes for filling or compressing insulating material in tubes
    • 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
    • A24F40/20—Devices using solid inhalable precursors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • Embodiments of this application relate to the field of heat-not-burn cigarette device technologies, and in particular, to a vapor generation device, a heater for a vapor generation device, and a manufacturing method.
  • Tobacco products (such as cigarettes, cigars, and the like) burn tobacco during use to produce tobacco smoke. Attempts are made to replace these tobacco-burning products by making products that release compounds without burning.
  • Patent No. 202010054217.6 proposes encapsulation of a heater with a spiral heating wire in a metal outer sleeve tube to heat a tobacco product to generate an aerosol.
  • insulation between the spiral heating wire and the metal outer sleeve tube is usually implemented by filling an inorganic insulating adhesive or filling an inorganic powder material in the metal outer sleeve tube.
  • a large number of pores affect transfer of heat between the heating wire and the outer sleeve tube.
  • An embodiment of this application provides a vapor generation device, configured to heat an aerosol-forming article to generate an aerosol, and including:
  • the shell includes a metal or an alloy.
  • a melting point of the precursor material forming the insulator ranges from 400°C to 1500°C.
  • the melting point of the precursor material is lower than a melting point of the shell.
  • the insulator includes glaze or glass or silicon dioxide.
  • the resistor heating element is configured into a form of a spiral coil extending in the axial direction of the hollow; and a cross section of a wire material of the spiral coil is configured into a flat shape.
  • the cross section of the wire material of the spiral coil is configured with a length extending in an axial direction of the spiral coil being greater than a length extending in a radial direction.
  • the insulator is configured to keep the resistor heating element in the hollow.
  • the resistor heating element is wrapped in the insulator.
  • the resistor heating element has a metal oxide layer formed through surface oxidation.
  • the insulator includes at least one of aluminum oxide or a precursor thereof, silicon dioxide or a precursor thereof, aluminate, aluminosilicate, aluminum nitride, aluminum carbide, zirconium dioxide, silicon carbide, silicon boride, silicon nitride, titanium dioxide, titanium carbide, boron carbide, boron oxide, borosilicate, silicate, rare earth oxide, soda lime, barium titanate, lead zirconate titanate, aluminum titanate, barium ferrite, strontium ferrite, or this type of inorganic materials.
  • Still another embodiment of this application further provides a heater for a vapor generation device.
  • the heater includes:
  • Still another embodiment of this application further provides a manufacturing method of a heater for a vapor generation device, including the following steps:
  • the step of solidifying or curing a molten precursor material in the hollow includes:
  • the method before the immersing the resistor heating element in the precursor in the molten state, the method further includes: forming a metal oxide layer on a surface of the resistor heating element.
  • power is supplied to the resistor heating element in an air or oxygen atmosphere to enable the resistor heating coil to generate heat, to form the metal oxide layer the surface of the resistor heating element.
  • the resistor heating element is heated in an air or oxygen atmosphere, to form the metal oxide layer the surface of the resistor heating element.
  • an insulating material layer is sprayed or deposited or formed on the surface of the resistor heating element.
  • the insulating material layer is a glaze layer.
  • the insulator is formed through solidification after melting, and the insulator can be completely permeated to a gap or an interval between an inner wall of the shell of the heater and the resistor heating element, so that basically complete insulation is achieved between the shell and the resistor heating element.
  • the consistency and yield of insulation in mass production and manufacturing can be improved.
  • FIG. 1 An embodiment of this application provides a vapor generation device.
  • the device includes:
  • the heater 30 generally has a pin or needle shape, which facilitates insertion into the aerosol-forming article A.
  • the heater 30 may have a length of approximately 12 millimeters to 19 millimeters, and an outer diameter of approximately millimeters 2 to 4 millimeters.
  • the aerosol-forming article A is preferably a tobacco-containing material that releases a volatile compound from a substrate during heating; or may be a non-tobacco material that can be appropriate for electrical heating and smoke generation after heating.
  • the aerosol-forming article A is preferably a solid substrate, and may include one or more of powder, particles, shreds, strips, or sheets of one or more of herb leaves, tobacco leaves, homogeneous tobacco, and expanded tobacco; or, the solid substrate may include additional tobacco or non-tobacco volatile aroma compound, which is to be released when the substrate is heated.
  • the heater 30 may usually include a resistor heating element and an auxiliary base material that assists fixing, manufacturing, or the like of the resistor heating element.
  • the resistor heating element has a spiral coil shape or form.
  • the resistor heating element is in a form of a conductive trajectory combined with a substrate.
  • the resistor heating element has a shape of a thin-sheet base material.
  • FIG. 2 to FIG. 4 are schematic diagrams of a cross section of the heater 30 and some members in an embodiment, including:
  • the first conductive pin 321 penetrates the resistor heating coil 320 from the upper end of the resistor heating coil 320 to the lower end, to facilitate a connection.
  • the resistor heating coil 320 is completely assembled and kept in the hollow 311 of the shell 31, and after assembly, the resistor heating coil 320 and the shell 31 conduct heat to each other.
  • a material of the resistor heating coil 320 is a metal material, a metal alloy, graphite, carbon, a conductive ceramic or another composite material of a ceramic material and a metal material that has appropriate impedance.
  • An appropriate metal or alloy material includes at least one of nickel, cobalt, zirconium, titanium, a nickel alloy, a cobalt alloy, a zirconium alloy, a titanium alloy, a nickel-chromium alloy, a nickel-iron alloy, an iron-chromium alloy, an iron-chromium-aluminum alloy, a titanium alloy, an iron-manganese-aluminum-base alloy, stainless steel, and the like.
  • the shell 31 is made of a thermally conductive metal or alloy material, for example, stainless steel. Certainly, after assembly, the resistor heating coil 320 and an inner wall of the hollow 311 of the shell 31 abut to conduct heat to each other, and at the same time the shell 31 and the resistor heating coil 320 are insulated from each other.
  • FIG. 5 is a schematic cross-sectional view of the resistor heating coil 320 shown in FIG. 4 from a viewing angle.
  • a shape of a cross section of a wire material of the resistor heating coil 320 is a wide or flat shape different from a conventional circle.
  • a size of the cross section of the wire material of the resistor heating coil 320 extending in a vertical direction is greater than a size extending in a radial direction perpendicular to the vertical direction, to make the resistor heating coil 320 a flat rectangular shape.
  • the resistor heating coil 320 with the foregoing structure, compared with a conventional spiral heating coil formed by wires with a circular cross section, a form of the wire material is completely or at least flattened. Therefore, the wire material extends in the radial direction to a small degree. Through this approach, an energy loss in the resistor heating coil 320 can be reduced. Particularly, the transfer of heat can be facilitated.
  • the first conductive pin 321 and the second conductive pin 322 is made of a material with a low resistance temperature coefficient.
  • the resistor heating coil 320 is made of a material with a relatively large forward or backward resistance temperature coefficient, so that in use, the circuit 20 may detect a resistance temperature coefficient of the resistor heating coil 320 to obtain a temperature of the resistor heating coil 320.
  • the first conductive pin 321 and the second conductive pin 322 are respectively made of two different materials of couple materials such as nickel, nickel-chromium alloy, nickel-silicon alloy, nickelchrome-Kao copper, constantan bronze, and ferrochrome.
  • a thermal couple configured to detect the temperature of the resistor heating coil 320 may be formed between the first conductive pin 321 and the second conductive pin 322, to obtain the temperature of the resistor heating coil 320.
  • the resistor heating coil 320 may be made of a conventional wire material with a circular cross section.
  • a resistor heating coil 320a with a spiral coil that is made or constructed using a circular wire material is used in a resistor heating element 32a shown in FIG. 6 .
  • two ends of the resistor heating coil 320a are respectively connected to a first conductive pin 321a and a second conductive pin 322a for power supply or temperature measurement.
  • an insulator 33 is filled or encapsulated in the hollow 311 of the shell 31, and the insulator 33 provide insulation between the resistor heating coil 320/320a and the shell 31.
  • the insulator 33 further provide support for the resistor heating coil 320/320a.
  • the resistor heating coil 320/320a is basically completely wrapped or embedded in the insulator 33.
  • Still another embodiment of this application further provides a manufacturing method of the foregoing heater 30.
  • the method includes the following steps.
  • the shell 31 is a pin or needle having an axial hollow 311.
  • a material is preferably a metal or an alloy, for example, 430 grade stainless steel (SS 430).
  • S20 Fill or pour a precursor 33a forming the insulator 33 into the hollow 311 of the shell 31, and heat the precursor 33a to make the precursor form a molten state, as shown in FIG. 8 .
  • S30 Obtain a resistor heating coil 320/320a made of a resistive metal or alloy material, and supply power to the resistor heating coil 320/320a in an air or oxygen atmosphere to make the resistor heating coil 320/320a generate heat, to produce thermal oxidation on a surface of the resistor heating coil 320/320a, so as to form a metal oxide layer located on the surface.
  • the oxide layer on the surface formed through surface oxidation on the resistor heating coil 320/320a made of a metal or material an alloy material in the foregoing step S30 approximately has a thickness of 10 nm to 100 nm.
  • power is supplied to the resistor heating coil 320/320a to make the resistor heating coil generate heat and dry-burn to 300°C to 500°C for approximately 10 min.
  • steps S30 thermal oxidation is caused on the surface of the resistor heating coil 320/320a by heating the resistor heating coil 320/320a in an air or oxygen atmosphere, to form the metal oxide layer located on the surface.
  • the method may further include the following steps.
  • S31 Further form an insulating material layer on the surface of the resistor heating coil 320/320a through spraying, deposition, sintering, or the like.
  • the insulating material layer is, for example, a glaze layer, a ceramic layer, or the like. This is conducive to further improving insulation effect.
  • the foregoing precursor 33a of the insulator 33 is preferably a material with a melting point lower than that of the shell 31.
  • the precursor 33a of the insulator 33 is made of an insulating material with a lower melting point.
  • the insulator 33 is made of glass or silicon dioxide or glaze. In a manufacturing process, the powder precursor 33a of the insulator is poured into the shell 31 and is heated to 650°C, so that the precursor is molten.
  • the precursor 33a of the insulator 33 may be made of bismuth oxide with a melting point of approximately 860°C, or boron oxide with a melting point of approximately 450°C, or boron, silicon, or aluminum oxide-containing mixed glass with a melting point of approximately 680°C.
  • the shell 31 when the shell 31 is made of a metal/an alloy or a ceramic with a melting point higher than that of stainless steel, there may be more options for the precursor 33a.
  • the precursor 33a of the insulator 33 is preferably made of inorganic oxide, carbide, nitride, or an inorganic salt, or the like with a melting point lower than 1500°C.
  • the precursor 33a is made of at least one of aluminum oxide or a precursor thereof, silicon dioxide or a precursor thereof, aluminate, aluminosilicate, aluminum nitride, aluminum carbide, zirconium dioxide, silicon carbide, silicon boride, silicon nitride, titanium dioxide, titanium carbide, boron carbide, boron oxide, borosilicate, silicate, rare earth oxide, soda lime, barium titanate, lead zirconate titanate, aluminum titanate, barium ferrite, strontium ferrite, or this type of inorganic materials, and is relatively easy to obtain and manufacture.
  • the precursor 33a of the insulator 33 is preferably made of, doped with or added with a material having a high thermal conduction coefficient, for example, silicon carbide, to enable heat of the resistor heating coil 320/320a to be transferred to the shell 31 more quickly.
  • a melting point of the precursor 33a of the insulator 33 is higher than 400°C, to keep the insulator 33 from melting when the heater 30 heats the aerosol-forming article A at a temperature of approximately 400°C.
  • the melting point of the precursor 33a of the insulator 33 approximately ranges from 600°C to 1500°C, and preferably may range from 600°C to 800°C.
  • the insulator 33 that is cooled and solidified after melting is tightly combined with the shell 31 and/or the resistor heating coil 320/320a.
  • another support or fixing structure is not required in the heater 30 to provide support or fixing for the resistor heating coil 320/320a and/or the insulator 33.
  • an opening of the hollow 311 of the shell 31 needs to be closed or blocked, to avoid a case such as powder leakage or adhesive leakage from an opening of the heater in use.
  • the insulator 33 is obtained through melting and curing and is combined inside a tubular cavity of the shell 31, and there is no problem such as powder leakage or adhesive leakage.
  • the opening of the hollow 311 of the shell 31 may be kept open or non-closed.
  • the insulator 33 is formed through curing from a molten state.
  • the precursor 33a can completely permeate into a gap or an interval between an inner wall of the shell 31 and the resistor heating coil 320/320a.
  • the insulator 33 basically can safely keep the inner wall of the shell 31 and the resistor heating coil 320/320a in a non-contact state, to further implement basically complete insulation between the shell and the resistor heating coil.
  • high-temperature melting at a higher temperature and sintering at a lower temperature are used.
  • the substance of the precursor 33a is changed from a crystal phase into a liquid phase, which is a first-order phase transition.
  • a first-order phase transition does not occur in common sintering.
  • a phase transition using melting can basically completely eliminate internal intervals or pores, which is conducive to improving the thermal capacity of the heater 30 and reducing temperature fluctuations in the heating process. In addition, this further can help to improve the structural strength inside the heater, and reduce powder leakage.
  • FIG. 10 is a temperature change curve of a heater that is cooled and manufactured in a shell 31 of SS 430 stainless steel after a precursor 33a of glass glaze is molten at 800°C in a use process in an embodiment.
  • FIG. 11 is a temperature change curve of a heater in a use process in a comparative example. The heater is formed through sintering at a temperature of 800°C after an insulator of a conventional aluminum oxide ceramic slurry is filled in the shell 31 of SS 430 stainless steel.
  • FIG. 12 is a temperature change curve of a heater in a use process in another comparative example. The heater is obtained through manufacturing after diamond powder is filled as the insulator in the shell 31 of SS 430 stainless steel.
  • high precision PID software controls the power of power supply, and further fluctuations at an actual working temperature of the heater are sampled.
  • FIG. 12 is a temperature curve of a conventional heater filled with diamond insulation powder. Temperature feedbacks during operation and temperature jump amplitudes in a heating process are relatively large, which approximately range from 30°C to 50°C.
  • FIG. 11 is a temperature curve of a heater obtained through sintering of an aluminum oxide ceramic slurry. In a heating process, temperature jump amplitudes approximately range from 10°C to 20°C.
  • FIG. 10 is a temperature curve of a heater using a molten and solidified glaze material as an insulator. In a heating process, temperature jumps are relatively small, and jump amplitudes approximately range from 3°C to 5°C. In a constant-temperature heating process, the curve is relatively flat.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
EP22815362.3A 2021-06-04 2022-06-02 Aerosolerzeugungsvorrichtung, heizer dafür und herstellungsverfahren Pending EP4349192A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110626465.8A CN115428987A (zh) 2021-06-04 2021-06-04 气雾生成装置、用于气雾生成装置的加热器及制备方法
PCT/CN2022/096910 WO2022253323A1 (zh) 2021-06-04 2022-06-02 气雾生成装置、用于气雾生成装置的加热器及制备方法

Publications (1)

Publication Number Publication Date
EP4349192A1 true EP4349192A1 (de) 2024-04-10

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Application Number Title Priority Date Filing Date
EP22815362.3A Pending EP4349192A1 (de) 2021-06-04 2022-06-02 Aerosolerzeugungsvorrichtung, heizer dafür und herstellungsverfahren

Country Status (3)

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EP (1) EP4349192A1 (de)
CN (1) CN115428987A (de)
WO (1) WO2022253323A1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034330A (en) * 1974-09-19 1977-07-05 Tokyo Shibaura Electric Co., Ltd. Sheath heater
JPS5227598A (en) * 1975-08-28 1977-03-01 Hitachi Heating Appliance Co Ltd Carged material for a heating unit
JP2007059061A (ja) * 2005-07-29 2007-03-08 Kanken Techno Co Ltd 電気ヒータおよび該ヒータを用いた半導体排ガス処理装置
CN210630648U (zh) * 2019-07-12 2020-05-29 深圳市新宜康科技股份有限公司 基于平衡强度与发热功率的加热不燃烧器件
CN111657557A (zh) * 2020-05-19 2020-09-15 深圳市华诚达精密工业有限公司 加热装置及其制造方法、加热不燃烧烟具

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CN115428987A (zh) 2022-12-06

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