EP4000433B1 - Smoke generating device for induction heating in folding air channel - Google Patents
Smoke generating device for induction heating in folding air channel Download PDFInfo
- Publication number
- EP4000433B1 EP4000433B1 EP20928055.1A EP20928055A EP4000433B1 EP 4000433 B1 EP4000433 B1 EP 4000433B1 EP 20928055 A EP20928055 A EP 20928055A EP 4000433 B1 EP4000433 B1 EP 4000433B1
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- EP
- European Patent Office
- Prior art keywords
- cigarette
- generating device
- heat
- smoke generating
- heating
- Prior art date
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- 238000010438 heat treatment Methods 0.000 title claims description 129
- 239000000779 smoke Substances 0.000 title claims description 57
- 230000006698 induction Effects 0.000 title claims description 43
- 235000019504 cigarettes Nutrition 0.000 claims description 140
- 230000005291 magnetic effect Effects 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 38
- 238000002955 isolation Methods 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 13
- 230000005294 ferromagnetic effect Effects 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 241000208125 Nicotiana Species 0.000 description 32
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 32
- 239000010410 layer Substances 0.000 description 30
- 230000000391 smoking effect Effects 0.000 description 18
- 238000005485 electric heating Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000004323 axial length Effects 0.000 description 6
- 239000003302 ferromagnetic material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 3
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000002241 glass-ceramic Substances 0.000 description 3
- 229920002530 polyetherether ketone Polymers 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000002679 ablation Methods 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
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- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
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- 229960002715 nicotine Drugs 0.000 description 1
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Images
Classifications
-
- 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
- A24F40/465—Shape or structure of electric heating means specially adapted for induction heating
-
- 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
- A24F40/485—Valves; Apertures
-
- 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
- A24F40/51—Arrangement of sensors
-
- 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
- H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
-
- 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D1/00—Cigars; Cigarettes
- A24D1/20—Cigarettes specially adapted for simulated smoking devices
-
- 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
Definitions
- the present invention relates to the field of novel cigarette smoking utensil, and in particular, to a smoke generating device with induction heating in a folded airway.
- heat-not-burn cigarettes are gaining increasing popularity among smokers since they are less harmful than traditional burning cigarettes.
- heating methods of heat-not-burn cigarettes include: contact electric heating, non-contact electric heating, charcoal heating, etc.
- Contact electric heating refers to obtaining flue gas through direct contact heating of cigarettes, which uses electric heating pipes, needles or plates and other forms of heating devices to directly contact the cigarettes or tobacco shreds, with direct contact and baking of cigarettes or tobacco at a temperature lower than the ignition point of the cigarette, so that the aroma and smoking components of the tobacco are volatilized, to meet smokers' requirements.
- charcoal-heated cigarette has the characteristics of less harm than the existing ordinary cigarettes, as the front end of the cigarette is attached with a carbon rod, which increases the difficulty of cigarette manufacturing, thereby affecting production efficiency; there are also weaknesses such as it takes a long time for consumers to ignite the carbon rod, the carbon rod may have a certain peculiar smell in case of burning, or that carbon monoxide and other unsafe factors exist due to poor ventilation of the smoking environment. Besides, the carbon rod is difficult to control after igniting, tobacco shreds are still burning when not smoking, and the end of the carbon rod is in direct contact with or relatively close to the tobacco; thus, the following problem exists: at the end of the burning carbon rod, there may be direct baking or critical baking of a small amount of residual tobacco shreds.
- the existing non-contact electric heating method uses a smoking utensil that electrically heats the input air, a ring-shaped metal heater, a flat-layer metal heater, or a combined flat-layer metal heater is directly energized and heated, so that the air flowing through the surface is heated, which is introduced into the cigarette for omnidirectional heating.
- Existing heating cigarettes consist of two parts: a tobacco section and a filter rod.
- Most of filter rods are composed of a supporting section close to the tobacco section, a cooling section in the middle, and the end in contact with the consumer's lips.
- the heating cigarette is inserted into the existing smoke generating device to heat the cigarette, as the tobacco section of the cigarette is relatively short, most of which is only 10 ⁇ 15mm, with the maximum of 20mm.
- Most cigarettes need to be inserted into the heating cavity of the smoke generating device together with the tobacco section and/or the supporting section of the filter rod.
- the end of the heating element may be less than 2mm away from the supporting section of the cigarette filter rod, even penetrating into the head of the supporting section of the filter rod.
- the supporting-section material cannot withstand the high temperature of the heating body with the occurrence of heat shrinkage or collapse. This not only affects smoking of the second half of the cigarette (the cigarette deforms or softens due to heat shrinkage or collapse of the supporting section), but also directly affects the smoking taste of the cigarette.
- CN209965242U discloses a circumferential heating vape.
- the vape has an air guide tube, a heat insulation tube and a heating tube.
- An air chamber is formed between the air guide tube and the heat insulation tube to isolate the heat emitted by the heating tube and to avoid excessive temperatures in the housing of the smoking device.
- the contact surface between the smoking device and the supporting section of the cigarette is still circular and has a large contact surface. The heat from the heating tube is transferred directly to the filter section of the cigarette, which can easily cause heat shrinkage of the filter section.
- the present invention provides a smoke generating device with induction heating in a folded airway.
- the smoke generating device includes: a cigarette introduction pipe 1, an induction coil 3, a heating cup 5, a heating element 6 and a magnetic sealing element 7;
- the cigarette introduction pipe 1 is disposed at the upper end of the smoke generating device, with a hollow tubular structure, its internal cavity is an air-mixing cavity 1D, the center of the upper end of the cigarette introduction pipe 1 is the first introduction hole 1B, and the center of the lower end is the second introduction hole 1E, the outer ring of the first introduction hole 1B is provided with a plurality of air-guiding grooves 1C, and the diameter of the air-mixing cavity 1D is larger than that of the first introduction hole 1B, the second introduction hole 1E and the first introduction hole 1B have the same diameter and are co-axial, the lower end of the cigarette introduction pipe 1 has at least one air inlet channel 1A;
- the first introduction hole 1B and the second introduction hole 1E are co-axial with the same diameter, which are slightly smaller than the nominal diameter of the cigarette, so as to snap-fit the inserted cigarette and prevent the cigarette from being accidentally taken out by the lips during smoking.
- the first introduction hole 1B and the second introduction hole 1E are preferably provided with chamfers to facilitate insertion of the cigarette in the direction in which the cigarette is inserted.
- the second introduction hole 1E is a cigarette guiding hole that assists in guiding and fixing the cigarette filter.
- the heating cup 5 is disposed below the cigarette introduction pipe 1, with a hollow cup-shaped structure as a whole, it has a cigarette accommodating cavity 8 inside, with at least one air inlet hole 9 at the bottom of the cup;
- the magnetic sealing element 7 surrounds the periphery of the heating cup 5, with a hollow cup-shaped structure as a whole, the bottom of the cup is relatively sealed (only two wiring pins of the temperature measuring element 12 need to pass under the magnetic sealing element 7), and there is an airflow channel between the inner wall of the magnetic sealing element 7 and the outer wall of the heating cup 5;
- the heating element 6 is disposed in the airflow channel, and the heating element 6 is made of a ferromagnetic metal with a structure that the air can pass through;
- the heating element 6 is clustered ferromagnetic metal wires, a clustered ferromagnetic metal mesh, or a ferromagnetic porous metal, and its interior and/or surface has/forms numerous dense airflow passages;
- the induction coil 3 is disposed on the periphery of the magnetic sealing element 7 and is connected to a power source;
- Airflow is in communication between the air-guiding groove 1C, the air-mixing cavity 1D, the air inlet channel 1A, the airflow channel, the air inlet hole 9 and the cigarette accommodating cavity 8.
- Airflow is in communication between numerous dense airflow passages that are on/ formed inside and/or on the surface of the heating element and the aforementioned airflow channels.
- the magnetic sealing element 7 is composed of high-temperature resistant materials such as glass-ceramics or ceramics that the magnetic field can penetrate through.
- the working principle of the air-mixing cavity 1D is that, when the cigarette to be smoked is inserted, the tobacco section of the cigarette is inserted into the cigarette accommodating cavity 8, and the cigarette filter rod is inserted into the cigarette introduction pipe 1.
- Outside air enters the air-mixing cavity 1D from the air-guiding groove 1C.
- the air at room temperature surrounding the cigarette filter rod heated through conduction and radiation separate the relatively high-temperature cigarette introduction pipe 1 from the cigarette filter rod, so that the existing cigarette introduction pipe 1 with a large area in contact with the cigarette filter rod becomes only in contact with the partial bore wall of the first introduction hole 1B and the short cylindrical inner bole wall of the second introduction hole 1E.
- the contact area between the two holes and the cigarette filter rod is small.
- the upper end of the second introduction hole 1E also has an orifice chamfer, which not only facilitates the introduction of cigarettes, but also further reduces the contact area with the cigarette filter rod.
- the axial length of the contact part of the second introduction hole 1E bore wall and the cigarette filter rod is preferably 0.3-0.8mm, basically in a linear contact.
- the temperature of the cigarette introduction pipe 1 is high, it is not easy to cause heat shrinkage of the material in the supporting section of the cigarette filter rod or generating peculiar smell; meanwhile, the relatively high temperature of the cooling section on the inner wall of the air-mixing cavity 1D of the cigarette introduction pipe 1 and the cigarette nozzle inserted into the center can properly pre-heat the inhaled air at room temperature, so as to achieve the purpose of reducing power consumption of the smoking utensil and improving heating efficiency.
- the induction coil 3 applies high-power, medium- and high-frequency currents when the smoking utensil is working, which can perform electromagnetic induction heating on the heating element 6 made of a ferromagnetic material.
- the induction coil 3 is disposed on the periphery of the magnetic sealing element 7.
- the heating element 6 includes a ferromagnetic metal fiber tow, a ferromagnetic metal fiber composite mesh, or ferromagnetic porous and foamed metal blocks.
- the smoke generating device further includes: an electromagnetic isolation ring 2 with a hollow tubular structure, which is disposed on the periphery of the induction coil 3.
- the induction coil 3 has a high-temperature insulation layer.
- the smoke generating device further includes:
- the high-temperature resistance means that the material does not significantly deform at 300 degrees Celsius.
- the insulation and heat isolation layer 7A is a made of a high-temperature resistant material, so as to protect the insulation layer on the surface of the induction coil 3 wound on it from ablation due to the high temperature of the magnetic sealing element 7. In this way, when the induction coil 3 passes medium- to high-frequency current, the high-frequency varying magnetic field acting on the heating element 6 can generate numerous small-range induced eddy currents in the heating element 6 made of a ferromagnetic material, which makes the heating element 6 quickly heat up.
- the insulating and high-temperature resistant wrapping layer 7B is a high-temperature resistant, insulating protective-film wrapping layer that is added to the outer layer of the induction coil 3 to protect against high temperature and assist in fixing the induction coil 3, it is used to protect the induction coil 3 and fix it on the outside of the magnetic sealing element 7.
- the electromagnetic isolation ring 2 is made of a non-ferromagnetic material including copper or aluminum alloy, the inner wall of the electromagnetic isolation ring 2 is 0.1-1mm or more from the insulating and high-temperature resistant wrapping layer 7B wrapped outside the induction coil 3; in this case, it minimizes the radially outward heat transfer of the entire smoke generating device on one hand, on the other hand, it prevents electromagnetic signals from radiating to the radially external radiation of the smoke generating device, thereby ensuring that there is a relatively good external electromagnetic environment around the smoke generating device, while reducing the transmission of electromagnetic power from useless directions.
- the smoke generating device further includes: a first temperature measuring element 4 and a second temperature measuring element 12; wherein, the first temperature measuring element 4 is implanted in the heating element 6, and the second temperature measuring element 12 is disposed in the heat-equalizing cavity 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 inside and facing the air inlet hole 9.
- the working processes of the first temperature measuring element 4 and the second temperature measuring element 12 are as follows: in the control circuit attached to the smoke generating device, the temperature of the heating element 6 is measured by the first temperature measuring element 4 and sent to the control circuit to control the electrical parameters loaded on the induction coil 3 in a timely manner.
- the heating element 6 exchanges the heat thereon with the inlet gas, they are sucked into the heat-equalizing cavity 11 and mixed evenly, and sucked into the cigarette from the air inlet hole 9 at the bottom of the heating cup 5 of the second temperature measuring element 12 in the center to heat the tobacco shreds of the cigarette.
- the second temperature measuring element 12 measures the air temperature in the heat-equalizing cavity 11 again and sends the information to the control circuit to get feedback and control of the heating power, rate and other parameters of the heating element 6.
- the smoke generating device further includes: a heat-insulating pipe 10, a heat-insulating seat 13, and a base 14; wherein, the heat-insulating pipe 10 is disposed on the periphery of the electromagnetic isolation ring 2 and is snap-fitted between the cigarette introduction pipe 1 and the base 14;
- the electromagnetic isolation ring 2 is snap-fitted between the cigarette introduction pipe 1 and the heat-insulating seat 13;
- the heat-insulating seat 13 is disposed under the magnetic sealing element 7, the base 14 is disposed under the heat-insulating seat 13.
- the heat-insulating pipe 10 is a vacuum double-layer insulating pipe.
- the heat-insulating seat 13 is made of heat-resistant silica gel.
- the base 14 is made of high-temperature resistant PEEK plastic, etc.
- the induction coil 3 is connected to a power source through a connecting wire 15, and the connecting wire 15 passes through the heat-insulating seat 13 and the base 14.
- an electromagnetic isolation layer is disposed in the smoke generating device, and the electromagnetic isolation layer includes: an electromagnetic isolation layer affixed to the inside of the air-mixing cavity 1D, and an electromagnetic isolation layer affixed to the upper or lower part of the heat-insulating seat 13.
- the upper part of the axial direction can be pasted with an aluminum foil layer of 0.01-0.1mm on the surrounding inner walls and upper and lower inner walls of the air-mixing cavity 1D; the lower end of the cigarette introduction pipe 1 has an inner boss protruding radially inward (the inner boss is formed inside the second introduction hole 1E), and the lower end surface of the inner boss must be pasted with 0.01-0.1mm aluminum foil.
- an aluminum washer of 0.01-0.1mm can also be attached to the upper or lower part of the heat-insulating seat 13, which can also prevent electromagnetic interference from being generated in the axial lower part.
- the surface of this layer of aluminum washer facing the direction of the cigarette accommodating cavity 8 is preferably silver-plated or polished to be high-gloss, so as to reflect back the heat radiated from the heat-equalizing cavity 11 for heat preservation inside the smoke generating device.
- the air inlet holes 9 are distributed annularly at the bottom of the heating cup 5.
- the diameter of the first introduction hole 1B and the second introduction hole 1E is slightly smaller than the nominal diameter of the cigarette to be smoked, which is equal to or smaller than the diameter of the cigarette accommodating cavity 8.
- the lower end of the cigarette introduction pipe 1 has an inner boss extending radially inward and has a lower boss extending axially downward, at least one air inlet channel 1A is annularly distributed on and penetrates the lower boss
- the upper end of the heating cup 5 abuts against the lower surface of the inner boss and is disposed inside the lower boss; the upper end of the magnetic sealing element 7 is disposed outside the lower boss.
- Cigarette introduction pipe 1A. Air inlet channel, 1B. First introduction hole, 1C. Air-guiding groove, 1D. Air-mixing cavity, 1E. Second introduction hole, 2. Electromagnetic isolation ring, 3. Induction coil, 4. First temperature measuring element, 5. Heating cup, 6. Heating element, 7. Magnetic sealing element, 7A. Insulation and heat-solation layer, 7B. Insulating and high-temperature resistant wrapping layer, 8. Cigarette accommodating cavity, 9. Air inlet hole, 10. Heat-insulating cavity, 11. Heat-equalizing cavity, 12. Second temperature measuring element, 13. Heat-insulating seat, 14. Base, 15. Connecting wire.
- a smoke generating device with induction heating in a folded airway includes: a cigarette introduction pipe 1, an isolation ring 2, an induction coil 3, a first temperature measuring element 4, a heating cup 5, a heating element 6, a magnetic sealing element 7, an insulation and heat isolation layer 7A, an insulating and high-temperature resistant wrapping layer 7B, a cigarette accommodating cavity 8, an air inlet hole 9, a heat-insulating cavity 10, a heat-equalizing cavity 11, a second temperature measuring element 12, a heat-insulating seat 13, a base 14, and connecting wire 15.
- the cigarette introduction pipe 1 is disposed at the upper end of the smoke generating device, with a hollow tubular structure, its internal cavity is an air-mixing cavity 1D, the center of the upper end of the cigarette introduction pipe 1 is the first introduction hole 1B, and the center of the lower end is the second introduction hole 1E, the outer ring of the first introduction hole 1B is provided with a plurality of air-guiding grooves 1C, and the diameter of the air-mixing cavity 1D is larger than that of the first introduction hole 1B, the second introduction hole 1E and the first introduction hole 1B have the same diameter and are co-axial, the lower end of the cigarette introduction pipe 1 has at least one air inlet channel 1A;
- the diameter of the first introduction hole 1B is equal to that of the second introduction hole 1E, which is slightly smaller than that of the cigarette accommodating cavity 8, and also equal to or slightly smaller than the outer diameter of the inserted cigarette;
- the outside of the cigarette introduction pipe 1 is designed with a plurality of stepped structures to fix the electromagnetic isolation ring 2, the heating cup 5, the magnetic sealing element 7, and the heat-insulating cavity 10 below through snap-fitting.
- the specific design is as follows:
- the lower part of the first introduction hole 1B of the cigarette introduction pipe 1 has a three-stage stepped truncated cone that extends downward along the axial direction of the first introduction hole 1B and contracts in the radial direction;
- the first-stage cone has the largest outer diameter, containing the air-mixing cavity 1D inside, its outside is connected to the heat-insulating cavity 10;
- the second-stage cone shrinks inward, which may be connected to the electromagnetic isolation ring 2, while ensuring that there is at least a space of 0.3mm with the inner wall of the heat-insulating cavity 10, its lower end face abuts against or parallels with the upper edge of the induction coil 3;
- the diameter of the third-stage cone is further reduced, its outer circle is directly inscribed with the inner
- the heating cup 5 is disposed below the cigarette introduction pipe 1, with a hollow cup-shaped structure as a whole, it has a cigarette accommodating cavity 8 inside, the diameter of the cigarette accommodating cavity 8 is equal to or slightly greater than that of the first introduction hole 1B, both are equal to or slightly greater than the outer diameter of the cigarette inserted into it, and the center of the cup bottom has one or a plurality of air inlet hole(s) 9;
- the magnetic sealing element 7 surrounds the periphery of the heating cup 5, with a hollow cup-shaped structure as a whole, the bottom of the cup is sealed, and there is an airflow channel between the inner wall of the magnetic sealing element 7 and the outer wall of the heating cup 5;
- the heating element 6 is disposed in the airflow channel between the magnetic sealing element 7 and the heating cup 5.
- the heating element 6 is a ferromagnetic metal fiber bundle disposed in a ring shape radially distributed along the center line, and a plurality of airflow passages are formed inside.
- the induction coil 3 is disposed on the periphery of the magnetic sealing element 7 and is connected to a power source, the induction coil 3 can inductively heat the heating element 6 made of a ferromagnetic material.
- the inhaled airflow passes through: the air-guiding groove 1C, the air-mixing cavity 1D, the air inlet channel 1A, the airflow channel, the air inlet hole 9, and the cigarette accommodating cavity 8.
- the material of the cigarette introduction pipe 1 is made of a high-temperature resistant PEEK synthetic material with relatively poor heat conductivity.
- the heating cup 5 is made of glass-ceramics or ceramics.
- the magnetic sealing element 7 is made of glass-ceramic.
- the electromagnetic isolation ring 2 has a hollow tubular structure and is disposed on the periphery of the induction coil 3.
- the electromagnetic isolation ring 2 is made of a non-ferromagnetic material including copper or aluminum alloy.
- the insulating and high-temperature resistant wrapping layer 7B is a high-temperature resistant, insulating protective film coating layer that is added to the outer layer of the induction coil 3 to protect and assist in fixing the induction coil 3, which is used to protect the induction coil 3 and fix it on the outer side of the heating cup 5.
- the insulation and heat isolation layer 7A is a made of a high-temperature resistant material that is wrapped on the periphery of the magnetic sealing element 7, so as to protect the insulation layer on the surface of the induction coil 3 wound on it from ablation due to the high temperature of the magnetic sealing element 7.
- the high-frequency varying magnetic field acting on the heating element 6 can generate numerous small-range induced eddy currents in the heating element 6 made of a ferromagnetic material, which makes the heating element 6 quickly heat up.
- the first temperature measuring element 4 is disposed inside the heating element 6, and the second temperature measuring element 12 is disposed in the heat-equalizing cavity 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 and is opposite to the air inlet hole 9 in the center.
- the smoke generating device is attached with a control circuit (not shown in the figures of the present disclosure).
- the working process of the control circuit is as follows: The temperature of the heating element 6 is measured by the first temperature measuring element 4 and sent to the control circuit to control the electrical parameters loaded on the induction coil 3 in a timely manner.
- the heating element 6 exchanges the heat thereon with the inlet gas, the gas is sucked into the heat-equalizing cavity 11 formed below the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 to be uniformly mixed, the temperature becomes consistent, and the gas is inhaled from the center, with the heating cup 5 of the second temperature measuring element 12 at the bottom of the air inlet hole 9, into the cigarette, to heat and bake the tobacco shreds of the cigarette.
- the second temperature measuring element 12 measures the air temperature in the heat-equalizing cavity 11 again, and sends the information to the control circuit to get feedback and control of the heating power, rate and other parameters of the heating element 6.
- the heat-insulating pipe 10 is disposed on the periphery of the electromagnetic isolation ring 2 and is snap-fitted between the cigarette introduction pipe 1 and the base 14; the electromagnetic isolation ring 2 is snap-fitted between the cigarette introduction pipe 1 and the heat-insulating seat 13; the heat-insulating seat 13 made of heat-resistant silica gel is disposed below the magnetic sealing element 7, and the base 14 made of a high-temperature resistant material PEEK plastic is disposed under the heat-insulating seat 13.
- the heat-insulating pipe 10 is a vacuum double-layered and heat-insulation pipe.
- the heat-insulating seat 13 and the base 14 cooperate with the above-mentioned components to complete the axial positioning of the entire smoke generating device.
- the connecting wire 15 of the induction coil 3 also passes through the heat-insulating seat 13 and the base 14.
- the upper part of the axial direction can be pasted with an aluminum foil layer of 0.01-0.1mm on the surrounding inner walls and upper and lower inner walls of the air-mixing cavity 1D (not shown in FIG.1 ); similarly, at the axial lower part of the smoke generating device, an aluminum washer of 0.01-0.1mm can also be attached to the upper or lower part of the heat-insulating seat 13 (not shown in FIG. 1 ), which can also prevent electromagnetic interference from being generated in the axial lower part.
- FIG.2 shows the positions of each part of the cigarette, sucking of airflow, and the direction of the airflow.
- I is the tobacco section of the cigarette, the length of which is greater than the height at which the heating cup 5 can be inserted.
- II is the filter rod of the cigarette, which is composed of the filter rod supporting section III inserted into the air-mixing cavity 1D, the flue gas cooling section IV exposed in the air, and the lip-end filter section V.
- the air at room temperature surrounding the cigarette filter rod separates the high-temperature cigarette introduction pipe 1, the cigarette filter rod II only touches the partial wall of the first introduction hole 1B and that of the second introduction hole 1E.
- the bore wall of the second introduction hole 1E that is indirectly heated is only in line contact with the tobacco section of the cigarette, which can effectively prevent heat shrinkage and deformation of the cigarette filter rod as it does not directly contact the cigarette filter rod.
- the temperature of the cigarette introduction pipe 1 is relatively high after being sucked, thus it is not easy to cause heat shrinkage of the material in the supporting section III on the cigarette filter rod.
- the high temperature of the inner wall of the air-mixing cavity 1D of the cigarette introduction pipe 1 can also appropriately increase the temperature of the inhaled air, so as to improve heat efficiency.
- the airflow path in the smoke generating device is as follows: outside air enters the air-mixing cavity 1D from the first introduction hole 1B and the air-guiding groove 1C for mixing, the inner wall of the air-mixing cavity 1D pre-heats the air inside, the air enters the airflow channel through the air inlet channel 1A, and is heated by the heating element 6 inside, it enters the heat-equalizing cavity 11 after the heat and pressure are homogenized, then enters the cigarette in the cigarette accommodating cavity 8 through the air inlet hole 9 to heat the tobacco section of the cigarette to generate aerosol, and it is mixed with the aerosol to form smoke and sucked out of the cigarette by users.
- the bottom of the heating cup 5 has a plurality of air inlet holes 9 distributed annularly, and the schematic longitudinal sectional view of the smoke generating device is shown in FIG.3 .
- the second temperature measuring element 12 is disposed in the heat-equalizing cavity 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 and is opposite to or biases toward any air inlet hole 9 (demonstrated by the air inlet hole 9 on the far right in the figures).
- the heated air enters the cigarette accommodating cavity 8 from the heat-equalizing cavity 11 through a plurality of annularly distributed air inlet holes 9, the degree of dispersion of the air is higher, and the heating effect of the cigarette is even.
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- General Induction Heating (AREA)
Description
- The present invention relates to the field of novel cigarette smoking utensil, and in particular, to a smoke generating device with induction heating in a folded airway.
- With the improvement of health awareness of the public, heat-not-burn cigarettes are gaining increasing popularity among smokers since they are less harmful than traditional burning cigarettes. At present, heating methods of heat-not-burn cigarettes include: contact electric heating, non-contact electric heating, charcoal heating, etc.
- Contact electric heating refers to obtaining flue gas through direct contact heating of cigarettes, which uses electric heating pipes, needles or plates and other forms of heating devices to directly contact the cigarettes or tobacco shreds, with direct contact and baking of cigarettes or tobacco at a temperature lower than the ignition point of the cigarette, so that the aroma and smoking components of the tobacco are volatilized, to meet smokers' requirements.
- The problems with the above-mentioned methods of heating cigarettes or tobacco shreds are as follows:
- 1. The tobacco shreds in direct contact with the cigarette or tobacco can be fully baked, while those at a distance from the heating element cannot be fully baked, thereby the baking effect has a certain degree of unevenness on the cross section of the circumference of the cigarette;
- 2. As the heating device itself has a small volume and its heat capacity is not high, smokers need to wait for a certain amount of heating time before smoking. As the heating element is in direct contact with tobacco shreds, in order to ensure the heating effect of the tobacco shreds away from the heating element, the surface of the heating element is usually increased by 10-20 degrees than the optimal heating temperature to ensure heating adequacy. Meanwhile, the problem is that after the tobacco shreds in contact with the heating element are heated for several times, the baked tobacco substances may stick to the heating element, bringing peculiar smell or heating difficulties to the subsequent cigarette smoking.
- Existing charcoal-heated cigarettes are ignited by a carbon rod attached to the front end of the tobacco, and the air flowing through the carbon rod is rapidly heated. When the hot air continues to flow through tobacco shreds at the end of the cigarette under negative pressure during the smoker's suction, tobacco shreds are baked and heated to achieve non-combustion heating of tobacco shreds. Thus, such heating method can obtain tobacco aroma and avoid harmful substances such as tar and nicotine produced in large quantities due to ignition. However, although such charcoal-heated cigarette has the characteristics of less harm than the existing ordinary cigarettes, as the front end of the cigarette is attached with a carbon rod, which increases the difficulty of cigarette manufacturing, thereby affecting production efficiency; there are also weaknesses such as it takes a long time for consumers to ignite the carbon rod, the carbon rod may have a certain peculiar smell in case of burning, or that carbon monoxide and other unsafe factors exist due to poor ventilation of the smoking environment. Besides, the carbon rod is difficult to control after igniting, tobacco shreds are still burning when not smoking, and the end of the carbon rod is in direct contact with or relatively close to the tobacco; thus, the following problem exists: at the end of the burning carbon rod, there may be direct baking or critical baking of a small amount of residual tobacco shreds.
- The existing non-contact electric heating method uses a smoking utensil that electrically heats the input air, a ring-shaped metal heater, a flat-layer metal heater, or a combined flat-layer metal heater is directly energized and heated, so that the air flowing through the surface is heated, which is introduced into the cigarette for omnidirectional heating.
- However, non-contact electric heating method mentioned above has the following problems:
- 1. Due to energization of adjacent surfaces of the heating element, sufficient space is required for mutual insulation to prevent short circuits; thus, there is a problem that only the air flowing through the surface layer of the heating element can be sufficiently heated;
- 2. The problem of inconvenience in temperature measurement and control of the heating element: as the temperature sensor cannot be directly installed on the heating element that requires intervals; besides, inconvenience of installation and wiring on the airflow channel exists, there are large temperature differences in the flowing and static status of the airflow when sucking or not, and that the airflow is not easy to control.
- Existing heating cigarettes consist of two parts: a tobacco section and a filter rod. Most of filter rods are composed of a supporting section close to the tobacco section, a cooling section in the middle, and the end in contact with the consumer's lips. When the heating cigarette is inserted into the existing smoke generating device to heat the cigarette, as the tobacco section of the cigarette is relatively short, most of which is only 10~15mm, with the maximum of 20mm. Most cigarettes need to be inserted into the heating cavity of the smoke generating device together with the tobacco section and/or the supporting section of the filter rod. Besides, in case consumers use general-purpose smoking utensils that are not produced for a certain variety (or brand) of cigarettes, the end of the heating element may be less than 2mm away from the supporting section of the cigarette filter rod, even penetrating into the head of the supporting section of the filter rod. Under the above circumstances, once the cigarette is normally heated and sucked, there is a high probability that the supporting-section material cannot withstand the high temperature of the heating body with the occurrence of heat shrinkage or collapse. This not only affects smoking of the second half of the cigarette (the cigarette deforms or softens due to heat shrinkage or collapse of the supporting section), but also directly affects the smoking taste of the cigarette.
- In order to solve the above-mentioned problems, the present disclosure is proposed.
-
CN209965242U discloses a circumferential heating vape. The vape has an air guide tube, a heat insulation tube and a heating tube. An air chamber is formed between the air guide tube and the heat insulation tube to isolate the heat emitted by the heating tube and to avoid excessive temperatures in the housing of the smoking device. However, the contact surface between the smoking device and the supporting section of the cigarette is still circular and has a large contact surface. The heat from the heating tube is transferred directly to the filter section of the cigarette, which can easily cause heat shrinkage of the filter section. - The problem is solved by smoke generating device with the features of
claim 1. Preferred embodiments are described in the dependent claims. - The present invention provides a smoke generating device with induction heating in a folded airway. The smoke generating device includes: a
cigarette introduction pipe 1, aninduction coil 3, aheating cup 5, aheating element 6 and a magnetic sealing element 7; - Wherein, the
cigarette introduction pipe 1 is disposed at the upper end of the smoke generating device, with a hollow tubular structure, its internal cavity is an air-mixing cavity 1D, the center of the upper end of thecigarette introduction pipe 1 is thefirst introduction hole 1B, and the center of the lower end is thesecond introduction hole 1E, the outer ring of thefirst introduction hole 1B is provided with a plurality of air-guidinggrooves 1C, and the diameter of the air-mixing cavity 1D is larger than that of thefirst introduction hole 1B, thesecond introduction hole 1E and thefirst introduction hole 1B have the same diameter and are co-axial, the lower end of thecigarette introduction pipe 1 has at least oneair inlet channel 1A; - The
first introduction hole 1B and thesecond introduction hole 1E are co-axial with the same diameter, which are slightly smaller than the nominal diameter of the cigarette, so as to snap-fit the inserted cigarette and prevent the cigarette from being accidentally taken out by the lips during smoking. Thefirst introduction hole 1B and thesecond introduction hole 1E are preferably provided with chamfers to facilitate insertion of the cigarette in the direction in which the cigarette is inserted. - The
second introduction hole 1E is a cigarette guiding hole that assists in guiding and fixing the cigarette filter. - The
heating cup 5 is disposed below thecigarette introduction pipe 1, with a hollow cup-shaped structure as a whole, it has a cigarette accommodatingcavity 8 inside, with at least oneair inlet hole 9 at the bottom of the cup; - The magnetic sealing element 7 surrounds the periphery of the
heating cup 5, with a hollow cup-shaped structure as a whole, the bottom of the cup is relatively sealed (only two wiring pins of thetemperature measuring element 12 need to pass under the magnetic sealing element 7), and there is an airflow channel between the inner wall of the magnetic sealing element 7 and the outer wall of theheating cup 5; - The
heating element 6 is disposed in the airflow channel, and theheating element 6 is made of a ferromagnetic metal with a structure that the air can pass through; - For example, the
heating element 6 is clustered ferromagnetic metal wires, a clustered ferromagnetic metal mesh, or a ferromagnetic porous metal, and its interior and/or surface has/forms numerous dense airflow passages; - The
induction coil 3 is disposed on the periphery of the magnetic sealing element 7 and is connected to a power source; - Airflow is in communication between the air-guiding
groove 1C, the air-mixing cavity 1D, theair inlet channel 1A, the airflow channel, theair inlet hole 9 and the cigarette accommodatingcavity 8. - Airflow is in communication between numerous dense airflow passages that are on/ formed inside and/or on the surface of the heating element and the aforementioned airflow channels.
- The magnetic sealing element 7 is composed of high-temperature resistant materials such as glass-ceramics or ceramics that the magnetic field can penetrate through.
- The working principle of the air-
mixing cavity 1D is that, when the cigarette to be smoked is inserted, the tobacco section of the cigarette is inserted into the cigarette accommodatingcavity 8, and the cigarette filter rod is inserted into thecigarette introduction pipe 1. Outside air enters the air-mixingcavity 1D from the air-guidinggroove 1C. In this cavity, the air at room temperature surrounding the cigarette filter rod heated through conduction and radiation separate the relatively high-temperaturecigarette introduction pipe 1 from the cigarette filter rod, so that the existingcigarette introduction pipe 1 with a large area in contact with the cigarette filter rod becomes only in contact with the partial bore wall of thefirst introduction hole 1B and the short cylindrical inner bole wall of thesecond introduction hole 1E. As the axial lengths of the wall of the two holes are relatively short, the contact area between the two holes and the cigarette filter rod is small. - Preferably, the upper end of the
second introduction hole 1E also has an orifice chamfer, which not only facilitates the introduction of cigarettes, but also further reduces the contact area with the cigarette filter rod. The axial length of the contact part of thesecond introduction hole 1E bore wall and the cigarette filter rod is preferably 0.3-0.8mm, basically in a linear contact. In this case, even if affected by the heating part, the temperature of thecigarette introduction pipe 1 is high, it is not easy to cause heat shrinkage of the material in the supporting section of the cigarette filter rod or generating peculiar smell; meanwhile, the relatively high temperature of the cooling section on the inner wall of the air-mixingcavity 1D of thecigarette introduction pipe 1 and the cigarette nozzle inserted into the center can properly pre-heat the inhaled air at room temperature, so as to achieve the purpose of reducing power consumption of the smoking utensil and improving heating efficiency. - The
induction coil 3 applies high-power, medium- and high-frequency currents when the smoking utensil is working, which can perform electromagnetic induction heating on theheating element 6 made of a ferromagnetic material. - Preferably, the
induction coil 3 is disposed on the periphery of the magnetic sealing element 7. - Preferably, the
heating element 6 includes a ferromagnetic metal fiber tow, a ferromagnetic metal fiber composite mesh, or ferromagnetic porous and foamed metal blocks. - Preferably, the smoke generating device further includes: an
electromagnetic isolation ring 2 with a hollow tubular structure, which is disposed on the periphery of theinduction coil 3. Theinduction coil 3 has a high-temperature insulation layer. - Preferably, the smoke generating device further includes:
- An insulation and
heat isolation layer 7A is wrapped around the periphery of the magnetic sealing element 7; - An insulating and high-temperature
resistant wrapping layer 7B is wrapped around the periphery of theinduction coil 3, and there is a gap between the insulating and high-temperatureresistant wrapping layer 7B and the inner wall of theelectromagnetic isolation ring 2 to further insulate heat. - In the present disclosure, the high-temperature resistance means that the material does not significantly deform at 300 degrees Celsius.
- The insulation and
heat isolation layer 7A is a made of a high-temperature resistant material, so as to protect the insulation layer on the surface of theinduction coil 3 wound on it from ablation due to the high temperature of the magnetic sealing element 7. In this way, when theinduction coil 3 passes medium- to high-frequency current, the high-frequency varying magnetic field acting on theheating element 6 can generate numerous small-range induced eddy currents in theheating element 6 made of a ferromagnetic material, which makes theheating element 6 quickly heat up. - The insulating and high-temperature
resistant wrapping layer 7B is a high-temperature resistant, insulating protective-film wrapping layer that is added to the outer layer of theinduction coil 3 to protect against high temperature and assist in fixing theinduction coil 3, it is used to protect theinduction coil 3 and fix it on the outside of the magnetic sealing element 7. - The
electromagnetic isolation ring 2 is made of a non-ferromagnetic material including copper or aluminum alloy, the inner wall of theelectromagnetic isolation ring 2 is 0.1-1mm or more from the insulating and high-temperatureresistant wrapping layer 7B wrapped outside theinduction coil 3; in this case, it minimizes the radially outward heat transfer of the entire smoke generating device on one hand, on the other hand, it prevents electromagnetic signals from radiating to the radially external radiation of the smoke generating device, thereby ensuring that there is a relatively good external electromagnetic environment around the smoke generating device, while reducing the transmission of electromagnetic power from useless directions. - Preferably, the smoke generating device further includes: a first
temperature measuring element 4 and a secondtemperature measuring element 12; wherein, the firsttemperature measuring element 4 is implanted in theheating element 6, and the secondtemperature measuring element 12 is disposed in the heat-equalizingcavity 11 formed between the bottom of theheating cup 5 and the bottom of the magnetic sealing element 7 inside and facing theair inlet hole 9. - The working processes of the first
temperature measuring element 4 and the secondtemperature measuring element 12 are as follows: in the control circuit attached to the smoke generating device, the temperature of theheating element 6 is measured by the firsttemperature measuring element 4 and sent to the control circuit to control the electrical parameters loaded on theinduction coil 3 in a timely manner. - When the gas sucked in from the air-mixing
cavity 1D passes through the gap of theheating element 6, theheating element 6 exchanges the heat thereon with the inlet gas, they are sucked into the heat-equalizingcavity 11 and mixed evenly, and sucked into the cigarette from theair inlet hole 9 at the bottom of theheating cup 5 of the secondtemperature measuring element 12 in the center to heat the tobacco shreds of the cigarette. At this time, the secondtemperature measuring element 12 measures the air temperature in the heat-equalizingcavity 11 again and sends the information to the control circuit to get feedback and control of the heating power, rate and other parameters of theheating element 6. - Preferably, the smoke generating device further includes: a heat-insulating
pipe 10, a heat-insulatingseat 13, and abase 14; wherein, the heat-insulatingpipe 10 is disposed on the periphery of theelectromagnetic isolation ring 2 and is snap-fitted between thecigarette introduction pipe 1 and thebase 14; - The
electromagnetic isolation ring 2 is snap-fitted between thecigarette introduction pipe 1 and the heat-insulatingseat 13; - The heat-insulating
seat 13 is disposed under the magnetic sealing element 7, thebase 14 is disposed under the heat-insulatingseat 13. - The heat-insulating
pipe 10 is a vacuum double-layer insulating pipe. The heat-insulatingseat 13 is made of heat-resistant silica gel. Thebase 14 is made of high-temperature resistant PEEK plastic, etc. - The
induction coil 3 is connected to a power source through a connectingwire 15, and the connectingwire 15 passes through the heat-insulatingseat 13 and thebase 14. - Preferably, an electromagnetic isolation layer is disposed in the smoke generating device, and the electromagnetic isolation layer includes: an electromagnetic isolation layer affixed to the inside of the air-mixing
cavity 1D, and an electromagnetic isolation layer affixed to the upper or lower part of the heat-insulatingseat 13. - More specifically, when electromagnetic isolation requires maximum sealing at both axial ends of the smoke generating device, the upper part of the axial direction can be pasted with an aluminum foil layer of 0.01-0.1mm on the surrounding inner walls and upper and lower inner walls of the air-mixing
cavity 1D; the lower end of thecigarette introduction pipe 1 has an inner boss protruding radially inward (the inner boss is formed inside thesecond introduction hole 1E), and the lower end surface of the inner boss must be pasted with 0.01-0.1mm aluminum foil. Similarly, at the axial lower part of the smoke generating device, an aluminum washer of 0.01-0.1mm can also be attached to the upper or lower part of the heat-insulatingseat 13, which can also prevent electromagnetic interference from being generated in the axial lower part. Certainly, there should be holes of appropriate size where the aluminum washer, the heat-insulatingseat 13 and the place where the two connectingwires 15 lead out to prevent short circuits. The surface of this layer of aluminum washer facing the direction of the cigaretteaccommodating cavity 8 is preferably silver-plated or polished to be high-gloss, so as to reflect back the heat radiated from the heat-equalizingcavity 11 for heat preservation inside the smoke generating device. - Preferably, the air inlet holes 9 are distributed annularly at the bottom of the
heating cup 5. - Preferably, the diameter of the
first introduction hole 1B and thesecond introduction hole 1E is slightly smaller than the nominal diameter of the cigarette to be smoked, which is equal to or smaller than the diameter of the cigaretteaccommodating cavity 8. - Preferably, the lower end of the
cigarette introduction pipe 1 has an inner boss extending radially inward and has a lower boss extending axially downward, at least oneair inlet channel 1A is annularly distributed on and penetrates the lower boss - The upper end of the
heating cup 5 abuts against the lower surface of the inner boss and is disposed inside the lower boss; the upper end of the magnetic sealing element 7 is disposed outside the lower boss. - The above technical solutions can be freely combined under the premise of no contradiction.
- The present disclosure has the following beneficial effects:
- 1. The present disclosure designs for the first time an electric heating smoke generating device with induction heating in a folded airway, the heating principle is induction heating, a plurality of airflow channels that are on/formed inside/on the surface of the heating element can quickly and fully heat the air flowing through the surface and inside of the heating element, with the use of the heated air to heat the cigarettes, the problems of uneven heating of electric-heated cigarettes, flammable, uncontrollable charcoal-heated cigarettes with insufficient aroma components and poor smoking sensation can be effectively solved. Compared with the existing contact electric heating, non-contact electric heating, and charcoal heating methods, the smoke generating device of the present disclosure can bake the tobacco more evenly and fully, while avoiding problems such as adhesion of tobacco substances after baking and retention of tobacco section in the smoking utensil of contact electric heating.
- 2. The simple tandem "heating body + cigarettes" in the existing solutions may lengthen the axial length of the cigarette heating part, as well as that of the smoking device. To overcome such shortcomings and take advantage of induction heating, the present disclosure folds the original "heating body + cigarettes" with a reduced space axial length, so as to reduce the axial length of the heating part of the smoke generating device. The
heating element 6 of the present disclosure is disposed in the airway in a folded reciprocating form, which not only increases the length of the airflow channel, but also reduces the axial length of the smoke generating device. - 3. What's the most important is that the design of the air-mixing
cavity 1D inside thecigarette introduction pipe 1 and the air-guidinggroove 1C above it has the following effects: to reduce the contact area with the cigarette filter rod, so as to avoid heat shrinkage of the material in the supporting section of the cigarette filter rod; to pre-heat the inhaled air. - 4. A heat-equalizing
cavity 11 is formed between the bottom of theheating cup 5 and the bottom of the magnetic sealing element 7 of the smoke generating device. The heat-equalizingcavity 11 has the following functions: pressure differences generate in the heat-equalizingcavity 11 during users' sucking, under the action of pressure difference, the heat-equalizingcavity 11 inside produces multi-regional, micro-flow and homogenized heat and pressure difference to theair inlet hole 9, after receiving the negative pressure generated by suction, the relatively homogenized gas with a certain temperature drop is sucked into the cigarette inserted in the cigaretteaccommodating cavity 8, the homogenized high-temperature gas is used to bake and heat tobacco shreds in the cigarette. - 5. In the preferred technical solutions, the air inlet holes 9 are distributed annularly at the bottom of the
heating cup 5. When the air in the heat-equalizingcavity 11 enters the cigaretteaccommodating cavity 8, its degree of dispersion is higher, thus the heating effect of the cigarette is even. -
-
FIG.1 is a schematic longitudinal cross-sectional view of a smoke generating device with induction heating in a folded airway ofEmbodiment 1. -
FIG.2 is a schematic longitudinal cross-sectional view of the smoke generating device after inserting into a cigarette ofEmbodiment 1. -
FIG.3 is a schematic longitudinal cross-sectional view of a smoke generating device with induction heating in a folded airway ofEmbodiment 2. - 1. Cigarette introduction pipe, 1A. Air inlet channel, 1B. First introduction hole, 1C. Air-guiding groove, 1D. Air-mixing cavity, 1E. Second introduction hole, 2. Electromagnetic isolation ring, 3. Induction coil, 4. First temperature measuring element, 5. Heating cup, 6. Heating element, 7. Magnetic sealing element, 7A. Insulation and heat-solation layer, 7B. Insulating and high-temperature resistant wrapping layer, 8. Cigarette accommodating cavity, 9. Air inlet hole, 10. Heat-insulating cavity, 11. Heat-equalizing cavity, 12. Second temperature measuring element, 13. Heat-insulating seat, 14. Base, 15. Connecting wire.
- The present disclosure will be further explained below through specific embodiments.
- As shown in
FIG. 1 , a smoke generating device with induction heating in a folded airway includes: acigarette introduction pipe 1, anisolation ring 2, aninduction coil 3, a firsttemperature measuring element 4, aheating cup 5, aheating element 6, a magnetic sealing element 7, an insulation andheat isolation layer 7A, an insulating and high-temperatureresistant wrapping layer 7B, a cigaretteaccommodating cavity 8, anair inlet hole 9, a heat-insulatingcavity 10, a heat-equalizingcavity 11, a secondtemperature measuring element 12, a heat-insulatingseat 13, abase 14, and connectingwire 15. - Wherein, the
cigarette introduction pipe 1 is disposed at the upper end of the smoke generating device, with a hollow tubular structure, its internal cavity is an air-mixingcavity 1D, the center of the upper end of thecigarette introduction pipe 1 is thefirst introduction hole 1B, and the center of the lower end is thesecond introduction hole 1E, the outer ring of thefirst introduction hole 1B is provided with a plurality of air-guidinggrooves 1C, and the diameter of the air-mixingcavity 1D is larger than that of thefirst introduction hole 1B, thesecond introduction hole 1E and thefirst introduction hole 1B have the same diameter and are co-axial, the lower end of thecigarette introduction pipe 1 has at least oneair inlet channel 1A; - The diameter of the
first introduction hole 1B is equal to that of thesecond introduction hole 1E, which is slightly smaller than that of the cigaretteaccommodating cavity 8, and also equal to or slightly smaller than the outer diameter of the inserted cigarette; - Wherein, the outside of the
cigarette introduction pipe 1 is designed with a plurality of stepped structures to fix theelectromagnetic isolation ring 2, theheating cup 5, the magnetic sealing element 7, and the heat-insulatingcavity 10 below through snap-fitting. The specific design is as follows:
The lower part of thefirst introduction hole 1B of thecigarette introduction pipe 1 has a three-stage stepped truncated cone that extends downward along the axial direction of thefirst introduction hole 1B and contracts in the radial direction; the first-stage cone has the largest outer diameter, containing the air-mixingcavity 1D inside, its outside is connected to the heat-insulatingcavity 10; the second-stage cone shrinks inward, which may be connected to theelectromagnetic isolation ring 2, while ensuring that there is at least a space of 0.3mm with the inner wall of the heat-insulatingcavity 10, its lower end face abuts against or parallels with the upper edge of theinduction coil 3; the diameter of the third-stage cone is further reduced, its outer circle is directly inscribed with the inner wall of the magnetic sealed cavity 7, its lower end surface is distributed with a plurality ofinlets 1A orifices connected with the air-mixing cavity1D, and it abuts against the upper edge of theheating element 6, its inner circle is inscribed with the outer wall of theheating cup 5. - The
heating cup 5 is disposed below thecigarette introduction pipe 1, with a hollow cup-shaped structure as a whole, it has a cigaretteaccommodating cavity 8 inside, the diameter of the cigaretteaccommodating cavity 8 is equal to or slightly greater than that of thefirst introduction hole 1B, both are equal to or slightly greater than the outer diameter of the cigarette inserted into it, and the center of the cup bottom has one or a plurality of air inlet hole(s) 9; - The magnetic sealing element 7 surrounds the periphery of the
heating cup 5, with a hollow cup-shaped structure as a whole, the bottom of the cup is sealed, and there is an airflow channel between the inner wall of the magnetic sealing element 7 and the outer wall of theheating cup 5; - The
heating element 6 is disposed in the airflow channel between the magnetic sealing element 7 and theheating cup 5. Theheating element 6 is a ferromagnetic metal fiber bundle disposed in a ring shape radially distributed along the center line, and a plurality of airflow passages are formed inside. - The
induction coil 3 is disposed on the periphery of the magnetic sealing element 7 and is connected to a power source, theinduction coil 3 can inductively heat theheating element 6 made of a ferromagnetic material. - In the order of sequence, the inhaled airflow passes through: the air-guiding
groove 1C, the air-mixingcavity 1D, theair inlet channel 1A, the airflow channel, theair inlet hole 9, and the cigaretteaccommodating cavity 8. - The material of the
cigarette introduction pipe 1 is made of a high-temperature resistant PEEK synthetic material with relatively poor heat conductivity. Theheating cup 5 is made of glass-ceramics or ceramics. The magnetic sealing element 7 is made of glass-ceramic. - The
electromagnetic isolation ring 2 has a hollow tubular structure and is disposed on the periphery of theinduction coil 3. Theelectromagnetic isolation ring 2 is made of a non-ferromagnetic material including copper or aluminum alloy. - The insulating and high-temperature
resistant wrapping layer 7B is a high-temperature resistant, insulating protective film coating layer that is added to the outer layer of theinduction coil 3 to protect and assist in fixing theinduction coil 3, which is used to protect theinduction coil 3 and fix it on the outer side of theheating cup 5. There is at least a gap of 0.1-1mm between the inner wall of theelectromagnetic isolation ring 2 and the insulating and high-temperatureresistant wrapping layer 7B wrapped outside theinduction coil 3; in this case, it minimizes radially outward heat transfer of the entire smoke generating device on one hand, on the other hand, it prevents electromagnetic signals from radiating to the radially external radiation of the smoke generating device, thereby ensuring that there is a relatively good external electromagnetic environment around the smoke utensil, while reducing the transmission of electromagnetic power from useless directions. - The insulation and
heat isolation layer 7A is a made of a high-temperature resistant material that is wrapped on the periphery of the magnetic sealing element 7, so as to protect the insulation layer on the surface of theinduction coil 3 wound on it from ablation due to the high temperature of the magnetic sealing element 7. In this way, when theinduction coil 3 passes medium- to high-frequency current, the high-frequency varying magnetic field acting on theheating element 6 can generate numerous small-range induced eddy currents in theheating element 6 made of a ferromagnetic material, which makes theheating element 6 quickly heat up. - The first
temperature measuring element 4 is disposed inside theheating element 6, and the secondtemperature measuring element 12 is disposed in the heat-equalizingcavity 11 formed between the bottom of theheating cup 5 and the bottom of the magnetic sealing element 7 and is opposite to theair inlet hole 9 in the center. The smoke generating device is attached with a control circuit (not shown in the figures of the present disclosure). - The working process of the control circuit is as follows:
The temperature of theheating element 6 is measured by the firsttemperature measuring element 4 and sent to the control circuit to control the electrical parameters loaded on theinduction coil 3 in a timely manner. When the gas sucked in from the air-mixingcavity 1D passes through the pores of theheating element 6, theheating element 6 exchanges the heat thereon with the inlet gas, the gas is sucked into the heat-equalizingcavity 11 formed below the bottom of theheating cup 5 and the bottom of the magnetic sealing element 7 to be uniformly mixed, the temperature becomes consistent, and the gas is inhaled from the center, with theheating cup 5 of the secondtemperature measuring element 12 at the bottom of theair inlet hole 9, into the cigarette, to heat and bake the tobacco shreds of the cigarette. At this time, the secondtemperature measuring element 12 measures the air temperature in the heat-equalizingcavity 11 again, and sends the information to the control circuit to get feedback and control of the heating power, rate and other parameters of theheating element 6. - The heat-insulating
pipe 10 is disposed on the periphery of theelectromagnetic isolation ring 2 and is snap-fitted between thecigarette introduction pipe 1 and thebase 14; theelectromagnetic isolation ring 2 is snap-fitted between thecigarette introduction pipe 1 and the heat-insulatingseat 13; the heat-insulatingseat 13 made of heat-resistant silica gel is disposed below the magnetic sealing element 7, and the base 14 made of a high-temperature resistant material PEEK plastic is disposed under the heat-insulatingseat 13. - The heat-insulating
pipe 10 is a vacuum double-layered and heat-insulation pipe. The heat-insulatingseat 13 and the base 14 cooperate with the above-mentioned components to complete the axial positioning of the entire smoke generating device. The connectingwire 15 of theinduction coil 3 also passes through the heat-insulatingseat 13 and thebase 14. - When electromagnetic isolation requires maximum sealing at both axial ends of the smoke generating device, the upper part of the axial direction can be pasted with an aluminum foil layer of 0.01-0.1mm on the surrounding inner walls and upper and lower inner walls of the air-mixing
cavity 1D (not shown inFIG.1 ); similarly, at the axial lower part of the smoke generating device, an aluminum washer of 0.01-0.1mm can also be attached to the upper or lower part of the heat-insulating seat 13 (not shown inFIG. 1 ), which can also prevent electromagnetic interference from being generated in the axial lower part. Certainly, there should be holes of appropriate size where the aluminum washer, the heat-insulatingseat 13 and the place where the two connectingwires 15 lead out to prevent short circuits. - The schematic view after the cigarette is inserted into the smoke generating device of
Embodiment 1 is shown inFIG. 2. FIG.2 shows the positions of each part of the cigarette, sucking of airflow, and the direction of the airflow. - Wherein, I is the tobacco section of the cigarette, the length of which is greater than the height at which the
heating cup 5 can be inserted. II is the filter rod of the cigarette, which is composed of the filter rod supporting section III inserted into the air-mixingcavity 1D, the flue gas cooling section IV exposed in the air, and the lip-end filter section V. - The air entering from the outside enters the air-mixing
cavity 1D from the air-guidinggroove 1C. In this cavity, the air at room temperature surrounding the cigarette filter rod separates the high-temperaturecigarette introduction pipe 1, the cigarette filter rod II only touches the partial wall of thefirst introduction hole 1B and that of thesecond introduction hole 1E. In this way, the bore wall of thesecond introduction hole 1E that is indirectly heated is only in line contact with the tobacco section of the cigarette, which can effectively prevent heat shrinkage and deformation of the cigarette filter rod as it does not directly contact the cigarette filter rod. Even if affected by the heating part, the temperature of thecigarette introduction pipe 1 is relatively high after being sucked, thus it is not easy to cause heat shrinkage of the material in the supporting section III on the cigarette filter rod. Meanwhile, the high temperature of the inner wall of the air-mixingcavity 1D of thecigarette introduction pipe 1 can also appropriately increase the temperature of the inhaled air, so as to improve heat efficiency. - The airflow path in the smoke generating device is as follows: outside air enters the air-mixing
cavity 1D from thefirst introduction hole 1B and the air-guidinggroove 1C for mixing, the inner wall of the air-mixingcavity 1D pre-heats the air inside, the air enters the airflow channel through theair inlet channel 1A, and is heated by theheating element 6 inside, it enters the heat-equalizingcavity 11 after the heat and pressure are homogenized, then enters the cigarette in the cigaretteaccommodating cavity 8 through theair inlet hole 9 to heat the tobacco section of the cigarette to generate aerosol, and it is mixed with the aerosol to form smoke and sucked out of the cigarette by users. - The difference between the two embodiments is that the bottom of the
heating cup 5 has a plurality of air inlet holes 9 distributed annularly, and the schematic longitudinal sectional view of the smoke generating device is shown inFIG.3 . The secondtemperature measuring element 12 is disposed in the heat-equalizingcavity 11 formed between the bottom of theheating cup 5 and the bottom of the magnetic sealing element 7 and is opposite to or biases toward any air inlet hole 9 (demonstrated by theair inlet hole 9 on the far right in the figures). At this time, in the airway, the heated air enters the cigaretteaccommodating cavity 8 from the heat-equalizingcavity 11 through a plurality of annularly distributed air inlet holes 9, the degree of dispersion of the air is higher, and the heating effect of the cigarette is even. - The above are only specific embodiments of the present disclosure, the protection scope of the present disclosure is not limited thereto, any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present disclosure. The protection scope of the present invention is determined by the appended claims.
Claims (10)
- A smoke generating device with induction heating in a folded airway, wherein the smoke generating device comprises: a cigarette introduction pipe (1), an induction coil (3), a heating cup (5), a heating element (6) and a magnetic sealing element (7);wherein, the cigarette introduction pipe (1) is disposed at the upper end of the smoke generating device, with a hollow tubular structure, an internal cavity of the hollow tubular structure is an air-mixing cavity (1D), the center of the upper end of the cigarette introduction pipe (1) is a first introduction hole (1B), and the center of the lower end is a second introduction hole (1E), the outer ring of the first introduction hole (1B) is provided with a plurality of air-guiding grooves (1C), and a diameter of the air-mixing cavity (1D) is larger than that of the first introduction hole (1B), the second introduction hole (1E) and the first introduction hole (1B) have the same diameter and are co-axial, the lower end of the cigarette introduction pipe (1) has at least one air inlet channel (1A);the heating cup (5) is disposed under the cigarette introduction pipe (1), it has a hollow cup-shaped structure as a whole, with a cigarette accommodating cavity (8) inside, with at least one air inlet hole (9) at the bottom of the cup;the magnetic sealing element (7) surrounds the periphery of the heating cup (5), it has a hollow cup-shaped structure as a whole, the bottom of the cup is sealed, there is an airflow channel between the inner wall of the magnetic sealing element (7) and the outer wall of the heating cup (5);the heating element (6) is disposed in the airflow channel, and the heating element (6) is made of a ferromagnetic metal with a structure that the air can pass through;the induction coil (3) is disposed on the periphery of the magnetic sealing element (7) and is connected to a power source;airflow is in communication between the air-guiding groove (1C), the air-mixing cavity (1D), the air inlet channel (1A), the airflow channel, the air inlet hole (9), and the cigarette accommodating cavity (8).
- The smoke generating device of claim 1, wherein the heating element (6) comprises ferromagnetic metal fibers, a ferromagnetic metal fiber composite mesh, or ferromagnetic porous and foamed metal blocks.
- The smoke generating device of claim 1, wherein the smoke generating device further comprises: an electromagnetic isolation ring (2) with a hollow tubular structure, which is disposed on the periphery of the induction coil (3).
- The smoke generating device of claim 3, wherein the smoke generating device further comprises: an insulation and heat isolation layer (7A) wrapped around the periphery of the magnetic sealing element (7);
An insulating and high-temperature resistant wrapping layer (7B) is wrapped around the periphery of the induction coil (3), and there is a gap between the insulating and high-temperature resistant wrapping layer (7B) and the inner wall of the electromagnetic isolation ring (2). - The smoke generating device of claim 1, wherein the smoke generating device further comprises: a first temperature measuring element (4) and a second temperature measuring element (12); wherein the first temperature measuring element (4) is implanted inside the heating element (6), the second temperature measuring element (12) is disposed in a heat-equalizing cavity (11) formed between the bottom of the heating cup (5) and the bottom of the magnetic sealing element (7), and is facing the air inlet hole (9).
- The smoke generating device of claim 3, wherein the smoke generating device further comprises: a heat-insulating pipe (10), a heat-insulating seat (13), and a base (14); wherein the heat-insulating pipe (10) is disposed on the periphery of the electromagnetic isolation ring (2) and is snap-fitted between the cigarette introduction pipe (1) and the base (14);The electromagnetic isolation ring (2) is snap-fitted between the cigarette introduction pipe (1) and the heat-insulating seat (13);The heat-insulating seat (13) is disposed below the magnetic sealing element (7), the base (14) is disposed below the heat-insulating seat (13).
- The smoke generating device of claim 1, wherein the air inlet holes (9) are distributed annularly at the bottom of the heating cup (5).
- The smoke generating device of claim 1, wherein the diameter of the first introduction hole (1B) and the second introduction hole (1E) is slightly smaller than the nominal diameter of the cigarette, which is equal to or smaller than the diameter of the cigarette accommodating cavity (8).
- The smoke generating device of claim 1, wherein the lower end of the cigarette introduction pipe (1) has an inner boss extending radially inward and has a lower boss extending axially downward, at least one air inlet channel (1A) is annularly distributed on and penetrates the lower boss;
The upper end of the heating cup (5) abuts against the lower surface of the inner boss and is disposed inside the lower boss; the upper end of the magnetic sealing element (7) is disposed outside the lower boss. - The smoke generating device of claim 6, wherein an electromagnetic isolation layer is disposed inside, and the electromagnetic isolation layer comprises: an electromagnetic isolation layer attached to the inside of the air-mixing cavity (1D), and an electromagnetic isolation layer attached to the upper or lower part of the heat-insulating seat (13).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2020/118484 WO2022061911A1 (en) | 2020-09-28 | 2020-09-28 | Smoke generating device for induction heating in folding air channel |
Publications (3)
Publication Number | Publication Date |
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EP4000433A1 EP4000433A1 (en) | 2022-05-25 |
EP4000433A4 EP4000433A4 (en) | 2022-09-21 |
EP4000433B1 true EP4000433B1 (en) | 2023-11-01 |
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Application Number | Title | Priority Date | Filing Date |
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EP20928055.1A Active EP4000433B1 (en) | 2020-09-28 | 2020-09-28 | Smoke generating device for induction heating in folding air channel |
Country Status (4)
Country | Link |
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EP (1) | EP4000433B1 (en) |
JP (1) | JP7285333B2 (en) |
KR (1) | KR102573417B1 (en) |
WO (1) | WO2022061911A1 (en) |
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CN112021678A (en) * | 2020-09-28 | 2020-12-04 | 云南中烟工业有限责任公司 | Fuming device in folding air flue induction heating |
Family Cites Families (13)
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TWI669072B (en) * | 2014-05-21 | 2019-08-21 | 瑞士商菲利浦莫里斯製品股份有限公司 | Electrically heated aerosol-generating system and cartridge for use in such a system |
CN106307622B (en) * | 2016-11-11 | 2018-10-23 | 云南拓宝科技有限公司 | A kind of heating of thermal current is not burnt smoking set |
CN107594624A (en) * | 2017-10-20 | 2018-01-19 | 刘础齐 | A kind of compound apparatus for baking of electric heating type two-stage for being used to heat the cigarette that do not burn |
CN109892700B (en) * | 2017-12-11 | 2024-01-23 | 湖南中烟工业有限责任公司 | Low-temperature smoking set module and low-temperature smoking set based on electromagnetic heating |
EP3732938B1 (en) * | 2017-12-28 | 2023-04-26 | JT International SA | Induction heating assembly for a vapour generating device |
US11191298B2 (en) * | 2018-06-22 | 2021-12-07 | Rai Strategic Holdings, Inc. | Aerosol source member having combined susceptor and aerosol precursor material |
CN208523782U (en) * | 2018-07-05 | 2019-02-22 | 湖南中烟工业有限责任公司 | A kind of Novel heating low temperature smoking set |
CN209628627U (en) * | 2018-11-08 | 2019-11-15 | 深圳市合元科技有限公司 | Cigarette heater, electrically heated cigarette smoking device and insulating assembly |
US20200237018A1 (en) * | 2019-01-29 | 2020-07-30 | Rai Strategic Holdings, Inc. | Susceptor arrangement for induction-heated aerosol delivery device |
AU2020235037A1 (en) * | 2019-03-11 | 2021-09-23 | Nicoventures Trading Limited | Aerosol provision device |
CN210008531U (en) * | 2019-04-01 | 2020-02-04 | 常州市派腾电子技术服务有限公司 | Heating element, atomizer and electron cigarette |
CN209965242U (en) * | 2019-04-16 | 2020-01-21 | 深圳市康柏特科技开发有限公司 | Circumferential heating type non-combustible smoking set heating device and smoking set |
CN211510581U (en) * | 2019-09-19 | 2020-09-18 | 深圳麦克韦尔科技有限公司 | Smoking set |
-
2020
- 2020-09-28 KR KR1020217031226A patent/KR102573417B1/en active IP Right Grant
- 2020-09-28 WO PCT/CN2020/118484 patent/WO2022061911A1/en unknown
- 2020-09-28 JP JP2021560253A patent/JP7285333B2/en active Active
- 2020-09-28 EP EP20928055.1A patent/EP4000433B1/en active Active
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KR20220044159A (en) | 2022-04-06 |
EP4000433A4 (en) | 2022-09-21 |
JP7285333B2 (en) | 2023-06-01 |
KR102573417B1 (en) | 2023-09-01 |
JP2022553472A (en) | 2022-12-23 |
WO2022061911A1 (en) | 2022-03-31 |
EP4000433A1 (en) | 2022-05-25 |
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