Aerosol generating device and heater for aerosol generating device

Abstract

The utility model provides an aerosol generating device and a heater for the aerosol generating device. Wherein the aerosol generating device comprises: a chamber having an opening; the aerosol-generating article is at least partially receivable within or removable from the chamber through the opening; a heating body surrounding or defining at least a portion of the chamber; the heating body comprises a first end close to the opening and a second end deviating from the first end; the first electrode and the second electrode are arranged at intervals in the circumferential direction of the heating body; a first distance between the first electrode and / or the second electrode and the first end is smaller than a second distance between the first electrode and the second end; the battery cell is used for supplying power; and the first electrode and the second electrode are respectively connected with the positive electrode and the negative electrode of the battery cell through the circuit, so that current is guided on the heating body. According to the aerial fog generating device, the current density of the portion, close to the first end, of the heating body is larger than the current density of the portion, close to the second end, of the heating body through arrangement of the electrodes, and it is beneficial for forming temperature difference in the axial direction of the heating body.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of heat-not-burn aerosol generation, and in particular to an aerosol generating device and a heater for the aerosol generating device. Background Art

[0002] Smoking articles (eg, cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. People have attempted to replace these tobacco-burning articles by creating products that release compounds without combustion.

[0003] An example of such a product is a heating device that releases a compound by heating rather than burning a material. For example, the material may be an aerosol-generating article containing tobacco or other non-tobacco products that may or may not contain nicotine. A known heating device contains and heats the aerosol-generating article by a tubular heater made of a conductive ceramic material, and by arranging electrodes at opposite ends of the conductive ceramic tubular heater in the axial direction, thereby directing current in the axial direction of the tubular heater to generate Joule heat. Utility Model Content

[0004] One embodiment of the present application provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0005] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0006] a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first end proximate to the opening and a second end facing away from the first end;

[0007] The first electrode and the second electrode are arranged at intervals along the circumference of the heating body; a first distance between the first electrode and / or the second electrode and the first end is smaller than a second distance between the first electrode and / or the second electrode and the second end;

[0008] Battery cells, used for power supply;

[0009] A circuit is arranged to conduct current on the heating body by connecting one of the first electrode and the second electrode to the positive terminal of the battery cell and the other to the negative terminal of the battery cell.

[0010] In some embodiments, the second spacing is greater than or equal to 1 / 2 of the axial length of the heating body.

[0011] In some embodiments, the heating body is made of a conductive ceramic material by molding and then sintering, or the heating body is a conductive ceramic body, or the heating body only includes a conductive ceramic body.

[0012] In some embodiments, the thermal conductivity of the heater is greater than 20 W / mk.

[0013] In some embodiments, the thermal conductivity of the heater is between 25 and 40 W / mk.

[0014] In some embodiments, the heating body is arranged to be tubular;

[0015] The circumference of the heating body is greater than the axial length of the heating body; and / or the axial length of the heating body does not exceed 15 mm.

[0016] In some embodiments, the first spacing is between 0.5 and 2.0 mm.

[0017] In some embodiments, the first electrode and the second electrode are arranged opposite to each other in a radial direction of the heating body.

[0018] In some embodiments, when current is conducted on the heater through the first electrode and the second electrode, the resistance of the heater is between 0.5 and 5Ω.

[0019] In some embodiments, the first electrode and / or the second electrode has a first dimension along the axial direction of the heating body, and a second dimension along the circumferential direction of the heating body;

[0020] The first size is smaller than the second size.

[0021] In some embodiments, the first size is between 1 and 4 mm; and / or the second size is between 5 and 11 mm.

[0022] In some embodiments, the heating body comprises:

[0023] a first portion close to or defining the first end; a second portion close to or defining the second end; the first electrode and / or the second electrode are arranged on the first portion and avoid the second portion;

[0024] When current is conducted on the heating body through the first electrode and the second electrode, the first portion can generate heat by resistive Joule heat, and the second portion generates heat by receiving heat transferred from the first portion.

[0025] In some embodiments, the first electrode and / or the second electrode has a second dimension along the circumferential direction of the heating body;

[0026] The second dimension varies in the axial direction of the heating body.

[0027] In some embodiments, the first electrode and / or the second electrode comprises a first segment near the first end, and a second segment near the second end;

[0028] The size of the first section in the circumferential direction of the heating body is greater than the size of the second section in the circumferential direction of the heating body.

[0029] In some embodiments, the heating body comprises:

[0030] a first portion proximate to or defining the first end; a second portion proximate to or defining the second end; an inner diameter of the first portion being smaller than an inner diameter of the second portion;

[0031] When the aerosol generating article is received in the chamber, the inner surface of the first part contacts and abuts against the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by contact heat conduction; the inner surface of the second part forms or defines a gap with the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by radiating heat or radiating infrared.

[0032] In some embodiments, the inner diameter of the first portion is 0.5 to 3.0 mm larger than the inner diameter of the second portion.

[0033] In some embodiments, the inner diameter of the heating body gradually decreases along a direction approaching the first end.

[0034] In some embodiments, the heating body comprises:

[0035] a first portion proximate to or defining said first end;

[0036] a second portion proximate to or defining said second end;

[0037] At least one or more thermal barriers are formed between the first portion and the second portion to reduce the transfer of heat from the first portion to the second portion.

[0038] Another embodiment of the present application further provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0039] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0040] a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first end proximate to the opening and a second end facing away from the first end;

[0041] The first electrode and the second electrode are arranged at intervals along the circumference of the heating body for conducting current on the heating body; the first electrode and / or the second electrode include a first segment close to the first end and a second segment close to the second end; the size of the first segment in the circumference of the heating body is larger than the size of the second segment in the circumference of the heating body.

[0042] Or in some other embodiments, the first electrode and the second electrode are arranged at intervals along the circumference of the heating body, and are used to guide the current on the heating body; the first electrode and / or the second electrode include a first section close to the first end, and a second section close to the second end; the size of the first section in the circumference of the heating body is smaller than the size of the second section in the circumference of the heating body. In use, it is advantageous to partially offset the current or temperature field of the first electrode and the second electrode in the axial direction of the heating body away from the second end compared with the previous embodiment. In this embodiment, the size of the first electrode and / or the second electrode in the circumference of the heating body gradually decreases in the direction close to the first end; or, the size of the first electrode and / or the second electrode in the circumference of the heating body gradually increases in the direction away from the first end. Alternatively, the first electrode and / or the second electrode is in a stepped shape with a width increasing in the direction away from the first end.

[0043] Another embodiment of the present application further provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0044] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0045] a heating body made of a conductive ceramic material, surrounding or defining at least a portion of the chamber and used to heat the aerosol generating article; a first electrode and a second electrode are arranged on the heating body at intervals, and are used to conduct current on the heating body so that the heating body generates heat through resistive Joule heating;

[0046] The heating body comprises a first portion close to the opening and a second portion away from the opening; the inner diameter of the first portion is smaller than the inner diameter of the second portion;

[0047] When the aerosol generating article is received in the chamber, the inner surface of the first part contacts and abuts against the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by contact heat conduction; the inner surface of the second part forms or defines a gap with the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by radiating heat or radiating infrared.

[0048] Another embodiment of the present application further provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0049] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0050] a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first portion proximal to the opening and a second portion facing away from the opening;

[0051] The first electrode and the second electrode are arranged on the first part and avoid the second part; when the current is guided on the heating body through the first electrode and the second electrode, the first part can generate heat through resistive Joule heat, and the second part generates heat by receiving the heat transferred by the first part.

[0052] Another embodiment of the present application further provides an aerosol generating device, which is configured to heat an aerosol generating article to generate an aerosol; comprising:

[0053] a chamber having an opening through which an aerosol-generating article can be at least partially received in or removed from the chamber in use;

[0054] a heating body made of an electrically conductive ceramic material, surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article;

[0055] A first electrode and a second electrode are arranged at intervals along the circumference of the heating body and are used to guide current on the heating body;

[0056] The heating body includes a first portion close to the opening and a second portion away from the opening; at least one or more thermal barriers are formed between the first portion and the second portion to reduce the transfer of heat from the first portion to the second portion.

[0057] Another embodiment of the present application further provides a heater for an aerosol generating device, comprising:

[0058] A first end and a second end opposite to each other;

[0059] a tubular heating body made of conductive ceramic material, extending from the first end to the second end;

[0060] A first electrode and a second electrode are arranged at intervals along the circumference of the heating body to guide current in the circumference of the heating body;

[0061] The first electrode and the second electrode are arranged at intervals along the circumference of the heating body for conducting current on the heating body; the first electrode and / or the second electrode include a first segment close to the first end and a second segment close to the second end; the size of the first segment in the circumference of the heating body is larger than the size of the second segment in the circumference of the heating body.

[0062] Another embodiment of the present application further provides a heater for an aerosol generating device, comprising:

[0063] A first end and a second end opposite to each other;

[0064] A tubular heating body made of a conductive ceramic material, extending from the first end to the second end; the heating body comprises a first portion close to or defining the first end, and a second portion close to or defining the second end; the inner diameter of the first portion is smaller than the inner diameter of the second portion;

[0065] The first electrode and the second electrode are arranged on the first portion at intervals along the circumferential direction of the heating body and avoid the second portion.

[0066] Another embodiment of the present application further provides a heater for an aerosol generating device, comprising:

[0067] A first end and a second end opposite to each other;

[0068] A tubular heating body made of an electrically conductive ceramic material, extending from the first end to the second end; the heating body comprises a first portion close to or defining the first end, and a second portion close to or defining the second end;

[0069] A first electrode and a second electrode are arranged on the first portion at intervals along the circumference of the heating body and avoid the second portion;

[0070] At least one or more thermal barriers are formed between the first portion and the second portion to reduce the transfer of heat from the first portion to the second portion.

[0071] Another embodiment of the present application further provides a heater for an aerosol generating device, comprising:

[0072] A first end and a second end opposite to each other;

[0073] a tubular heating body extending from the first end to the second end;

[0074] A first electrode and a second electrode are arranged at intervals along the circumference of the heating body to guide current in the circumference of the heating body; a first distance between the first electrode and / or the second electrode and the first end is smaller than a second distance between the first electrode and the second end;

[0075] The second interval is greater than or equal to 1 / 2 of the axial length of the heating body.

[0076] In the above aerosol generating device, the current density of the portion of the electrode arranged on the heating body close to the first end is greater than the current density close to the second end, which is beneficial for forming a temperature difference in the axial direction of the heating body. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0078] Figure 1 is a schematic diagram of an aerosol generating device provided by an embodiment;

[0079] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle heater from one perspective;

[0080] Figure 3 yes Figure 2 Schematic diagram of the working current of the central heater from the circumferential perspective;

[0081] Figure 4 is a schematic diagram of the operating current of a heater from a circumferential perspective according to yet another embodiment;

[0082] Figure 5 is a structural schematic diagram of a heater of yet another embodiment from one perspective;

[0083] Figure 6 is a structural schematic diagram of a heater of yet another embodiment from one perspective;

[0084] Figure 7 is a cross-sectional schematic diagram of a heater according to another embodiment from one viewing angle;

[0085] Figure 8 is a cross-sectional schematic diagram of a heater according to another embodiment from one viewing angle;

[0086] Fig. 9 is a structural schematic diagram of a heater from one perspective of yet another embodiment;

[0087] Fig.10 is temperature sampling data at different positions during the heating process of the heater in one embodiment;

[0088] Fig.11 This is temperature sampling data at different positions during the heating process of the heater in another embodiment. DETAILED DESCRIPTION

[0089] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific implementation methods.

[0090] One embodiment of the present application provides an aerosol generating device 100 that heats, rather than burns, an aerosol generating product 1000, such as a cigarette, so that at least one component of the aerosol generating product 1000 is volatilized or released to form an aerosol for inhalation, for example Figure 1 shown.

[0091] In an optional implementation, the aerosol generating article 1000 preferably uses a tobacco-containing material that releases volatile compounds from the substrate when heated; or it can also be a non-tobacco material that can be heated and suitable for electric heating and smoking. The aerosol generating article 1000 preferably uses a solid substrate, which can include one or more of powder, particles, fragments, strips or flakes of one or more of herb leaves, tobacco leaves, homogenized tobacco, expanded tobacco, dried flowers, tea leaves, etc.; or, the solid substrate can contain additional tobacco or non-tobacco volatile flavor compounds to be released when the substrate is heated.

[0092] according to Figure 1 As shown, when the aerosol generating article 1000 is received in the aerosol generating device 100, a portion thereof is exposed outside the aerosol generating device 100, such as a filter tip, which is advantageous for a user to inhale.

[0093] The structure of the aerosol generating device 100 according to one embodiment of the present application can be seen in Figure 1 As shown, the overall appearance of the device is generally constructed in a longitudinal shape, and the aerosol generating device 100 includes:

[0094] a chamber having an opening 40; in use, an aerosol-generating article 1000 can be removably received in the chamber through the opening 40 of the chamber;

[0095] A heater 30 is arranged at least partially around or bounding the chamber; when the aerosol generating article 1000 is received in the chamber, the heater 30 surrounds the aerosol generating article 1000 from the outside and heats the aerosol generating article 1000, so that the aerosol generating article 1000 releases a plurality of volatile compounds, and these volatile compounds are formed only by the heating process;

[0096] A battery cell 10 for supplying power; more preferably, the battery cell 10 is a rechargeable DC battery cell 10 and can be charged by connecting to an external power source;

[0097] The circuit board 20 , such as a PCB board or an FPC board, is provided with a circuit for conducting current between the battery cell 10 and the heater 30 .

[0098] exist Figure 1 and Figure 2 In the illustrated embodiment, the heater 30 is arranged to be tubular in shape, and a chamber for receiving the aerosol-generating article 1000 is formed or defined by at least a portion of the tubular hollowness of the heater 30. When the aerosol-generating article 1000 is received in the housing 10, the heater 30 at least partially surrounds or encloses the aerosol-generating article 1000 and heats the aerosol-generating article 1000 from the periphery. Also, when the aerosol-generating article 1000 is received in the housing 10, it is at least partially contained and held in the heater 30.

[0099] In some embodiments, the heater 30 may have an inner diameter dimension d11 of about 5.8 mm to 10 mm. In some embodiments, the heater 30 may have a length d12 of about 10 mm to 15 mm. In an embodiment, the circumferential length or circumference of the heater 30 is greater than the length d12 of the heater 30 in the axial direction. In some embodiments, the axial length d12 of the heater 30 does not exceed 15 mm or is less than 15 mm; preferably, the axial length d12 of the heater 30 is between 9 and 15 mm. In some specific embodiments, the heater 30 may have an inner diameter d11 of 7.6 mm; the heater 30 may have a length d12 of 11 mm.

[0100] exist Figure 2 and Figure 3 In the illustrated embodiment, the heater 30 comprises:

[0101] a tubular heating body 31 made of a conductive ceramic material; and,

[0102] The first electrode 321 and the second electrode 322 are formed on the outer surface of the heating body 31 .

[0103] In some embodiments, the heating body 31 is dense. In some specific embodiments, the porosity of the heating body 31 is less than 5%; more preferably, the porosity of the heating body 31 is less than 3%.

[0104] In some embodiments, the thickness of the tube wall of the heating body 31 is between 0.3 mm and 2.0 mm. In some specific embodiments, the thickness of the tube wall of the heating body 31 is 0.6 mm.

[0105] In some embodiments, the tubular heating body 31 made of conductive ceramic material is prepared by injection molding the raw material of the conductive ceramic material in a mold, and then sintering and curing it. For example, the preparation process may include: mixing the raw material of the conductive ceramic material with a liquid solvent to form an injectable slurry; then injecting the slurry into the mold cavity of the mold to form a tubular green embryo, demolding the green embryo, and sintering and curing it to obtain the heating body 31.

[0106] In some embodiments, the heating body 31 is formed by independently molding a conductive ceramic material. In an embodiment, the tubular heating body 31 made of a conductive ceramic material only includes or has a single heating body, rather than a composite heating body formed by combining multiple functional elements of different materials. For example, the composite heating body includes a heating body formed by an electrically insulating substrate (such as an electrically insulating ceramic or surface insulating metal, etc.) providing support, a resistive heating track or coating or etching mesh that is printed, deposited, wrapped, or mounted on the surface of the electrically insulating substrate. In some embodiments, the heating body 31 is or only includes a conductive ceramic body.

[0107] In some embodiments, the thermal conductivity of the heating body 31 is designed to be higher than that of conventional ordinary glass or ceramics; generally, the thermal conductivity of glass is about 1 W / mk, and generally, the thermal conductivity of ceramics is less than 20 W / mk or lower, less than 10 W / mk. In an embodiment, the thermal conductivity of the heating body 31 is greater than 20 W / mk; more preferably, the thermal conductivity of the heating body 31 is between 20 and 50 W / mk.

[0108] In an embodiment, the thermal conductivity of the heating body 31 is greater than 25 W / mk; in some specific embodiments, the thermal conductivity of the heating body 31 made of a conductive ceramic material is between 25 and 40 W / mk. Or in some other specific embodiments, the thermal conductivity of the heating body 31 is about 30 W / mk. In an embodiment, by making the thermal conductivity of the heating body 31 have the above range, it is beneficial to form Joule heat and temperature field difference in heating on a partial area by arranging the first electrode 321 and the second electrode 322.

[0109] In some embodiments, the relatively improved thermal conductivity of the heating body 31 is achieved by adding a metal oxide component as a ceramic phase with a relatively high thermal conductivity, such as aluminum oxide, titanium oxide, etc., so that the heating body 31 reaches the above thermal conductivity. In some embodiments, the relatively improved thermal conductivity of the heating body 31 is achieved by adding a conductive metal such as gold, silver, copper, etc. that improves the thermal conductivity to the conductive ceramic material, so that the heating body 31 reaches the above thermal conductivity.

[0110] In some embodiments, the resistivity of the heating element 31 made of conductive ceramic material is between 1×10 -4 Ω·cm~1.3×10-1 Ω·cm. Figure 2 and Figure 3 In the embodiment, when the current is guided in the heating body 31 through the first electrode 321 and the second electrode 322, the resistance value of the heating body 31 measured by the first electrode 321 and the second electrode 322 is between 0.5 and 5Ω. In some preferred embodiments, the resistance value of the heating body 31 measured by the first electrode 321 and the second electrode 322 is between 0.8 and 1.5Ω. In a specific embodiment, the resistance value of the heating body 31 measured by the first electrode 321 and the second electrode 322 is approximately 1.0Ω.

[0111] In some embodiments, the battery cell 10 has an output voltage of about 3.7 to 4.5 V; when the circuit board 20 supplies power to the heater 31 through the first electrode 321 and the second electrode 322 during use, the operating power of the heater 31 is about 10 to 40 W.

[0112] In some embodiments, the conductive ceramic material of the heating body 31 includes a main component and a doping component. In some embodiments, the main component accounts for more than 80% and less than or equal to 98% of the conductive ceramic by mass; the doping component accounts for more than 1% and less than or equal to 20% of the conductive ceramic by mass.

[0113] In some embodiments, the main component includes a first metal oxide, and the doping component includes a second metal oxide; the valence of the metal in the first metal oxide is different from the valence of the metal in the second metal oxide. In some embodiments, the valence of the metal in the first metal oxide is less than the valence of the metal in the second metal oxide; or in some embodiments, the valence of the metal in the first metal oxide is greater than the valence of the metal in the second metal oxide. In some embodiments, the valence of the metal in the second metal oxide is higher than 3.

[0114] In some embodiments, the main component includes zinc oxide; the doping component includes at least one of aluminum oxide, zirconium dioxide, titanium dioxide, or niobium pentoxide. In some embodiments, the mass percentage of zinc oxide in the conductive ceramic is between 94% and 97%. In some embodiments, the doping component includes aluminum oxide, and the mass percentage of aluminum oxide in the conductive ceramic is between 0.5% and 5%.

[0115] In some embodiments, the main component includes titanium dioxide, and the doping component includes at least niobium pentoxide. In some embodiments, the mass percentage of titanium dioxide in the conductive ceramic is between 85% and 95%, and the mass percentage of niobium pentoxide in the conductive ceramic is between 5% and 20%.

[0116] In some embodiments, the host component includes tantalum pentoxide; and the doping component includes at least one of titanium dioxide or zirconium dioxide.

[0117] In some embodiments, the main component includes at least one of a conductive metal boride, a metal nitride, or a metal carbide; and the doping component includes at least one of a non-conductive metal oxide or a metal nitride.

[0118] In some embodiments, the host component includes at least one of titanium boride, titanium nitride, or titanium carbide. In some embodiments, the doping component includes at least one of silicon dioxide and zirconium dioxide.

[0119] In some embodiments, the main component accounts for 20% to 80% of the conductive ceramic by weight. In some embodiments, the doping component accounts for 30% to 80% of the conductive ceramic by weight.

[0120] In some embodiments, the conductive ceramic material of the heating body 31 further includes a conductive resistivity / thermal conductivity regulating component for controlling the resistivity or thermal conductivity of the conductive ceramic within a target range. In some embodiments, the conductive resistivity / thermal conductivity regulating component includes at least one of a conductive metal carbide, a metal boride, carbon powder, or a conductive metal powder. In some embodiments, the metal carbide includes silicon carbide; and / or the metal boride includes titanium boride. In some embodiments, the conductive metal powder includes at least one of gold powder, silver powder, or copper powder.

[0121] In some embodiments, the conductive resistivity / thermal conductivity adjusting component accounts for 10% to 50% by weight of the conductive ceramic.

[0122] In some optional embodiments, the conductive ceramic material of the heating body 31 includes 94-97% by mass of zinc oxide, 0.8-5% by mass of aluminum oxide, 0-1% by mass of titanium dioxide, and 0-0.5 by mass of zirconium dioxide.

[0123] In some optional embodiments, the conductive ceramic material of the heating body 31 includes 85% to 95% by mass of titanium dioxide and 5% to 20% by mass of niobium pentoxide.

[0124] In some optional embodiments, the conductive ceramic material of the heating body 31 includes 5-10% by mass of titanium boride, 80-90% by mass of zinc oxide, and 1-5% by mass of aluminum oxide.

[0125] In some optional embodiments, the conductive ceramic material of the heating body 31 includes 50-80% by mass of titanium boride, 20-50% by mass of silicon carbide, and 0.1-2% by mass of silicon dioxide.

[0126] In some optional embodiments, the conductive ceramic material of the heating body 31 includes 40-70% by mass of titanium boride, 30-60% by mass of zirconium dioxide, and 0.1-5% by mass of silicon dioxide.

[0127] In some optional embodiments, the conductive ceramic material of the heating body 31 includes 20-50% by mass of titanium boride, 30-50% by mass of zirconium dioxide, and 10-30% by mass of copper powder, silver powder, or gold powder.

[0128] according to Figure 2 and Figure 3 As shown, the heating body 31 includes:

[0129] A first end 310 and a second end 320 facing each other in an axial direction; the first end 310 is arranged toward the opening 40; in use, the aerosol generating article 1000 can be received in the heating body 31 or removed from the heating body 31 from the first end 310;

[0130] The first portion 311 and the second portion 312 are arranged in the axial direction; wherein the first portion 311 is close to or defines the first end 310, and the second portion 312 is close to and defines the second end 320. In an embodiment, the first portion 311 and the second portion 312 are continuous; there is no separation or separation boundary between the first portion 311 and the second portion 312.

[0131] according to Figure 2 and Figure 3 As shown, the first electrode 321 and the second electrode 322 are bonded to the outer surface of the heating body 31 and are arranged opposite to each other in the radial direction of the heating body 31 .

[0132] In some embodiments, the first electrode 321 and / or the second electrode 322 include at least one of an electrode ring, an electrode cap, an electrode sheet, a track electrode or an electrode coating. In some embodiments, the first electrode 321 and / or the second electrode 322 are made of a metal or alloy with low resistivity. For example, the first electrode 321 and / or the second electrode 322 include gold, silver, copper or an alloy containing at least one of them. In some embodiments, the first electrode 321 and / or the second electrode 322 are obtained by printing or spraying or depositing a conductive paste containing the above metal or alloy with low resistivity on the outer surface of the heating body 31 and then curing it. For example, the first electrode 321 and / or the second electrode 322 are obtained by printing a conductive silver paste on the outer surface of the heating body 31 and then curing it.

[0133] according to Figure 2 and Figure 3As shown, the first electrode 321 and / or the second electrode 322 are arranged close to the first end 310; and the first electrode 321 and / or the second electrode 322 are far away from the second end 320. In some embodiments, the first electrode 321 and / or the second electrode 322 are located at the first portion 311 of the heating body 31 and avoid the second portion 312. There is no electrode on the second portion 312 for guiding current thereon.

[0134] In some embodiments, the first electrode 321 and / or the second electrode 322 has a first distance d21 from the first end 310. Also, the first distance d21 is smaller than a second distance d23 between the first electrode 321 and / or the second electrode 322 and the second end 320. Figure 2 and Figure 3 In some embodiments, the first electrode 321 and / or the second electrode 322 have a first dimension or height dimension d22 along the axial direction of the heater 30. In some embodiments, the first spacing d21 is smaller than the first dimension or height dimension d22. In some embodiments, the first spacing d21 is between 0.5 and 2.0 mm; the first dimension or height dimension d22 is between 1 and 4 mm. In some optional embodiments, the first spacing d21 is approximately 1 mm; the first dimension or height dimension d22 is approximately 2 mm.

[0135] according to Figure 2 and Figure 3 As shown, the first electrode 321 and / or the second electrode 322 has a second dimension or width dimension d24 along the circumferential direction of the heater 30. The second dimension or width dimension d24 is greater than the first dimension or height dimension d22. In some optional embodiments, the second dimension or width dimension d24 is approximately between 5 and 11 mm.

[0136] In an embodiment, the first electrode 321 and the second electrode 322 are electrically connected to the circuit board 20 by welding conductive leads, etc.; thus, in use, the circuit board 20 can operably connect the first electrode 321 and the second electrode 322 to the positive / negative poles of the battery cell 10, respectively, thereby guiding current on the heating body 31.

[0137] according to Figure 3 As shown in FIG. 1 , when the heating body 31 is powered by the first electrode 321 and the second electrode 322, a current i1 flowing from the first electrode 321 to the second electrode 322 is formed on the heating body 31. In operation, the current i1 is basically a current in the circumferential direction of the heating body 31. In an embodiment, the current i1 is mainly located or formed in the first portion 311 of the heating body 31, and the second portion 312 is basically free of current.

[0138] In some embodiments, the first dimension or height dimension d22 is smaller than ¼ of the axial length of the heating body 31 , which is beneficial for increasing or expanding the temperature difference between the first portion 311 and the second portion 312 .

[0139] In use, when the heating body 31 is powered by the first electrode 321 and the second electrode 322, the first portion 311 of the heating body 31 generates heat by resistive Joule heat. The second portion 312 itself does not generate heat substantially; Figure 3 As shown by the middle arrow R1 , heat is generated by receiving the heat transferred by the first part 311 .

[0140] In some embodiments, the circuit on the circuit board 20 is configured to control the power provided to the heater 31 according to a predetermined heating curve, so that the heater 31 heats the aerosol generating article 1000 according to the predetermined heating curve. For example, the applicant provides a variety of details about the heating curve of the predetermined time in Chinese patent CN112335940A, etc., and the above documents are fully incorporated herein by reference.

[0141] In the heating process of supplying power to the heating body 31 through the first electrode 321 and the second electrode 322, the temperature changes of the first part 311 and the second part 312 include:

[0142] In the first time stage or preheating stage, the first part 311 is heated from room temperature to a predetermined temperature; in the first time stage, since the second part 312 can only generate heat by receiving heat transferred by the first part 311, the temperature of the first part 311 is greater than the temperature of the second part 312;

[0143] In the second time stage or heating stage, the first part 311 is kept heated within a predetermined temperature range; in the second time stage, since the heating body 31 has the above-mentioned improved thermal conductivity, the second part 312 receives the conducted heat more quickly and thus the temperature is basically the same or similar to that of the first part 311.

[0144] according to Figure 2 and Figure 3 As shown in FIG. 1 , the first electrode 321 and the second electrode 322 are arranged in a trapezoidal shape rather than a conventional circular or square shape. In the axial direction of the heater 30 , the second dimension or width dimension d24 of the first electrode 321 and / or the second electrode 322 varies. For example, Figure 2 and Figure 3In the embodiment, the second size or width d24 of the first electrode 321 and / or the second electrode 322 gradually increases in a direction close to the first end 310. The width of the first section of the first electrode 321 and / or the second electrode 322 close to the first end 310 is greater than the width of the second section close to the second end 320.

[0145] In an embodiment, the spacing between the first electrode 321 and the second electrode 322 varies, specifically, the spacing therebetween gradually decreases in a direction approaching the first end 310; thereby, the current density on the first portion 311 of the heating body 31 increases in a direction approaching the first end 310, which is beneficial for forming a temperature difference on the heating body 31.

[0146] For example Fig.10 In one embodiment, Figure 2 and Figure 3 When the 12 mm long heater 30 shown in the figure is powered with 25 W of power, the temperature data of the four temperature sampling points (point A1 / point B1 / point C1 / point D1) in the axial direction of the heating body 31 in the first 11 seconds are collected in sequence; wherein the interval between the four adjacent temperature sampling points is 2.5 mm, wherein point A1 is close to the first end 310 and is spaced 2.0 mm from the first end 310, and point D1 is close to the second end 320 and is spaced 2.0 mm from the second end 320. In the heating process of the first 11 seconds, point A1 / point B1 close to the first end 310 heats up relatively faster.

[0147] or Figure 4 FIG. 4 is a schematic diagram showing a circumferentially expanded view of a heater 30a of another embodiment; in this embodiment, the heater 30a comprises:

[0148] A tubular heating body 31a extending between a first end 310a and a second end 320a; the heating body 31a includes a first portion 311a and a second portion 312a which are arranged continuously in the axial direction;

[0149] The first electrode 321a and the second electrode 322a are formed or combined on the outer surface of the heating body 31a and are arranged opposite to each other in the radial direction of the heating body 31a;

[0150] The first electrode 321a and the second electrode 322a are combined on the first portion 311a, relatively close to the first end 310a; the first electrode 321a and the second electrode 322a are electrically connected to the circuit board 20 by welding conductive wires, so that the circuit board 20 guides the current on the first portion 311a of the heating body 31a through the first electrode 321a and the second electrode 322a. Figure 4In operation, the first portion 311a generates heat through the Joule heat of the resistor; the second portion 312a generates heat mainly by receiving the heat transferred by the first portion 311a, as shown in FIG. Figure 4 As shown by the arrow R2.

[0151] In this embodiment, the first electrode 321a and the second electrode 322a are stepped; Figure 4 In the embodiment, the first electrode 321a and the second electrode 322a include two segments with different widths; specifically, the width of the first segment of the first electrode 321a and / or the second electrode 322a close to the first end 310a is greater than the width of the second segment away from the first end 310a; thereby, the current density on the first part 311a of the heating body 31a is greater on the side close to the first end 310a.

[0152] or Figure 5 A schematic diagram of a heater 30b of yet another embodiment is shown; in this embodiment, the heater 30b comprises:

[0153] A tubular heating body 31b extending between a first end 310b and a second end 320b; the heating body 31b includes a first portion 311b and a second portion 312b which are arranged continuously in the axial direction;

[0154] The first electrode 321b and the second electrode 322b are formed or combined on the outer surface of the heating body 31b and are arranged opposite to each other in the radial direction of the heating body 31b;

[0155] In this embodiment, the first electrode 321b and the second electrode 322b have a longer extension length on the heating body 31b; the first electrode 321b and the second electrode 322b extend from the first portion 311b to the second portion 312b.

[0156] In this embodiment, there is a first distance d31 between the first electrode 321b and / or the second electrode 322b and the first end 310b, and there is a second distance d33 between the first electrode 321b and / or the second electrode 322b and the second end 320b; the first distance d31 is smaller than the second distance d33. For example, in some specific embodiments, the first distance d31 is about 1 mm, and the second distance d33 is about 2 to 4 mm.

[0157] In this embodiment, the first electrode 321b and / or the second electrode 322b has a first dimension or height dimension d32 extending along the axial direction of the heating body 31b. In this embodiment, the first dimension or height dimension d32 is greater than 1 / 2 of the axial length of the heating body 31b. For example, in some specific embodiments, the first dimension or height dimension d32 is approximately 7 to 9 mm.

[0158] In this embodiment, the first electrode 321b and / or the second electrode 322b are in a trapezoidal shape and have a variable width dimension, so that the heating body 31b has a different current density in the axial direction, thereby having a temperature difference in the axial direction in the first time period. Or in some other variant embodiments, the first electrode 321b and / or the second electrode 322b are in a stepped shape; the first electrode 321b and / or the second electrode 322b include a first section located on the first portion 311a, and a second section located on the second portion 312a; the first section and the second section are both constant, and the width of the first section is greater than the width of the second section.

[0159] or Figure 6 , a schematic diagram of a heater 30c of another embodiment is shown in FIG. 1 ; in this embodiment, the first electrode 321c and the second electrode 322c extend from the first end 310c of the heating body 31c to the second end 320c; in this embodiment, the first electrode 321c and the second electrode 322c can simultaneously guide current on the first part 311c and the second part 312c of the heating body 31c, so that they generate heat through resistive Joule heat. In addition, the first electrode 321c and the second electrode 322c are trapezoidal in shape and have varying widths; so that the current density of the first part 311c is greater than the current density on the second part 312c, so that the temperature rises faster in the first time period.

[0160] Figure 7 A schematic diagram of a heater 30d of yet another embodiment is shown; in this embodiment, the heater 30d comprises:

[0161] A tubular heating body 31d extending between a first end 310d and a second end 320d; the heating body 31d includes a first portion 311d and a second portion 312d which are arranged continuously in the axial direction;

[0162] The first electrode 321d and the second electrode 322d are formed or bonded on the outer surface of the heating body 31d and are arranged opposite to each other in the radial direction of the heating body 31d.

[0163] In this embodiment, the first electrode 321d and the second electrode 322d are located on the first portion 311d, thereby directing current only on the first portion 311d.

[0164] In this embodiment, the outer diameter of the heating body 31d is constant; the first part 311d and the second part 312d have different inner diameters. Specifically, the wall thickness of the first part 311d and the wall thickness of the second part 312d are constant, and the wall thickness of the first part 311d is greater than the wall thickness of the second part 312d, so that the inner diameter of the second part 312d is greater than the inner diameter of the first part 311d. When the aerosol generating article 1000 is received in the heating body 31d and heated, the outer surface of the aerosol generating article 1000 is against or combined with the inner surface of the first part 311d, so that the first part 311d can heat the aerosol generating article 1000 mainly by contact heat conduction; while the inner surface of the second part 312d is not in contact with the outer surface of the aerosol generating article 1000, and a gap or clearance d41 is formed, so that the second part 312d mainly heats the aerosol generating article 1000 by radiating heat or infrared radiation from the ceramic material itself, rather than by contact heat conduction. In this type of heating method, the heating body 31d heats different parts of the aerosol generating article 1000 in different ways, which is beneficial for differentially or hierarchically exciting volatile components. In some embodiments, the gap or clearance d41 is between 0.25 and 1.5 mm. Alternatively, the inner diameter of the first portion 311d is 0.5 to 3.0 mm larger than the inner diameter of the second portion 312d.

[0165] For example Fig.11 In one embodiment, Figure 7 When the 12mm long heater 30d shown in the figure is powered by 25W, the temperature data of the four temperature sampling points (point A2 / point B2 / point C2 / point D2) in the axial direction of the heating body 31d in the first 11 seconds are collected in sequence; wherein, the interval between the four adjacent temperature sampling points is 2.5mm, wherein point A2 is close to the first end 310a and is 2.0mm away from the first end 310a, and point D2 is close to the second end 320a and is 2.0mm away from the second end 320a. Fig.11 It can be seen that compared with Fig.10 In the heater 30 with a constant inner diameter, the wall thickness of the second portion 312d is thinner so that the heat is quickly conducted between the points C2 and D2, thereby reducing the temperature difference therebetween.

[0166] or Figure 8 A schematic diagram of a heater 30e of yet another embodiment is shown; in this embodiment, the heater 30e comprises:

[0167] A tubular heating body 31e extending between a first end 310e and a second end 320e; the heating body 31e includes a first portion 311e and a second portion 312e which are continuously arranged in the axial direction;

[0168] The first electrode 321e and the second electrode 322e are formed or combined on the outer surface of the heating body 31e and are arranged opposite to each other in the radial direction of the heating body 31e. In this embodiment, the first electrode 321e and the second electrode 322e are located on the first part 311e, thereby guiding current only on the first part 311e.

[0169] In this embodiment, the outer diameter of the heating body 31e is constant and the inner diameter is gradually changed. Specifically, the inner diameter of the heating body 31e gradually decreases in the direction close to the first end 310e, so that the inner surface of the heating body 31e is inclined. Therefore, the inner diameter of the first portion 311e is greater than the inner diameter of the second portion 312e. When the aerosol generating article 1000 is received in the heating body 31e and heated, the first portion 311e heats the aerosol generating article 1000 partially by contact heat conduction and partially by radiation.

[0170] Fig. 9 A schematic diagram of a heater 30f of yet another embodiment is shown, in which the heater 30e comprises:

[0171] A tubular heating body 31f extending between a first end 310f and a second end 320f; the heating body 31f includes a first portion 311f and a second portion 312f which are continuously arranged in the axial direction;

[0172] The first electrode 321f and the second electrode 322f are formed or bonded on the outer surface of the heating body 31f and are arranged opposite to each other in the radial direction of the heating body 31f.

[0173] In this embodiment, at least one or more thermal barriers 313f are arranged on the heating body 31f between the first part 311f and the second part 312f; the thermal barriers 313f are used to reduce the transfer of heat from the first part 311f to the second part 312f. In use, since the heating body 31f has a relatively high thermal conductivity, the temperature on the first part 311f is greater than the temperature on the second part 312f, and the temperature fields of the first part 311f and the second part 312f are substantially uniform or the same.

[0174] In some embodiments, the thermal barrier 313f may be a groove or hollow formed on the outer surface of the heating body 31f to reduce heat transfer.

[0175] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but are not limited to the embodiments described in the specification. Furthermore, it is possible for a person of ordinary skill in the art to make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present application.

Claims

1. An aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; characterized in that: include: a chamber having an open opening; In use, an aerosol-generating article can be at least partially received in or removed from the chamber through the opening; a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first end proximate to the opening and a second end facing away from the first end; The first electrode and the second electrode are arranged at intervals along the circumference of the heating body; a first distance between the first electrode and / or the second electrode and the first end is smaller than a second distance between the first electrode and / or the second electrode and the second end; Battery cells, used for power supply; A circuit is arranged to conduct current on the heating body by connecting one of the first electrode and the second electrode to the positive terminal of the battery cell and the other to the negative terminal of the battery cell.

2. The aerosol generating device according to claim 1, characterized in that The second interval is greater than or equal to 1 / 2 of the axial length of the heating body.

3. The aerosol generating device according to claim 1 or 2, characterized in that: The thermal conductivity of the heating body is greater than 20 W / mk.

4. The aerosol generating device according to claim 3, characterized in that The thermal conductivity of the heating body is between 25 and 40 W / mk.

5. The aerosol generating device according to claim 1 or 2, characterized in that: The heating body is arranged in a tubular shape; The circumference of the heating body is greater than the axial length of the heating body; and / or the axial length of the heating body does not exceed 15 mm.

6. The aerosol generating device according to claim 1 or 2, characterized in that: The first spacing is between 0.5 and 2.0 mm.

7. The aerosol generating device according to claim 1 or 2, characterized in that: The first electrode and the second electrode are arranged opposite to each other in a radial direction of the heating body.

8. The aerosol generating device according to claim 2, characterized in that When current is conducted to the heating body through the first electrode and the second electrode, the resistance value of the heating body is between 0.5 and 5Ω.

9. The aerosol generating device according to claim 1 or 2, characterized in that: The first electrode and / or the second electrode has a first dimension along the axial direction of the heating body and a second dimension along the circumferential direction of the heating body; The first size is smaller than the second size.

10. The aerosol generating device according to claim 9, characterized in that The first size is between 1 and 4 mm; and / or the second size is between 5 and 11 mm.

11. The aerosol generating device according to claim 1 or 2, characterized in that: The heating body comprises: a first portion close to or defining the first end; a second portion close to or defining the second end; the first electrode and / or the second electrode are arranged on the first portion and avoid the second portion; When current is conducted on the heating body through the first electrode and the second electrode, the first portion can generate heat by resistive Joule heat, and the second portion generates heat by receiving heat transferred from the first portion.

12. The aerosol generating device according to claim 1 or 2, characterized in that: The first electrode and / or the second electrode has a second dimension along the circumferential direction of the heating body; The second dimension varies in the axial direction of the heating body.

13. The aerosol generating device according to claim 1 or 2, characterized in that: The first electrode and / or the second electrode comprises a first section close to the first end and a second section close to the second end; The size of the first section in the circumferential direction of the heating body is greater than the size of the second section in the circumferential direction of the heating body.

14. The aerosol generating device according to claim 1 or 2, characterized in that: The heating body comprises: a first portion proximate to or defining the first end; a second portion proximate to or defining the second end; an inner diameter of the first portion being smaller than an inner diameter of the second portion; When the aerosol generating article is received in the chamber, the inner surface of the first part contacts and abuts against the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by contact heat conduction; the inner surface of the second part forms or defines a gap with the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by radiating heat or radiating infrared.

15. The aerosol generating device according to claim 14, characterized in that The inner diameter of the first part is 0.5 to 3.0 mm larger than the inner diameter of the second part.

16. The aerosol generating device according to claim 1 or 2, characterized in that: The inner diameter of the heating body gradually decreases in a direction approaching the first end.

17. The aerosol generating device according to claim 1 or 2, characterized in that: The heating body comprises: a first portion proximate to or defining said first end; a second portion proximate to or defining said second end; At least one or more thermal barriers are formed between the first portion and the second portion to reduce the transfer of heat from the first portion to the second portion.

18. An aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; characterized in that: include: a chamber having an open opening; In use, an aerosol-generating article can be at least partially received in or removed from the chamber through the opening; a heating body surrounding or defining at least a portion of the chamber and configured to heat the aerosol-generating article; the heating body comprising a first end proximate to the opening and a second end facing away from the first end; The first electrode and the second electrode are arranged at intervals along the circumference of the heating body for conducting current on the heating body; the first electrode and / or the second electrode include a first segment close to the first end and a second segment close to the second end; the size of the first segment in the circumference of the heating body is larger than the size of the second segment in the circumference of the heating body.

19. An aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; characterized in that: include: a chamber having an open opening; In use, an aerosol-generating article can be at least partially received in or removed from the chamber through the opening; a heating body made of a conductive ceramic material, surrounding or defining at least a portion of the chamber and used to heat the aerosol generating article; a first electrode and a second electrode are arranged on the heating body at intervals, and are used to conduct current on the heating body so that the heating body generates heat through resistive Joule heating; The heating body comprises a first portion close to the opening and a second portion away from the opening; the inner diameter of the first portion is smaller than the inner diameter of the second portion; When the aerosol generating article is received in the chamber, the inner surface of the first part contacts and abuts against the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by contact heat conduction; the inner surface of the second part forms or defines a gap with the outer surface of the aerosol generating article, thereby heating the aerosol generating article mainly by radiating heat or radiating infrared.

20. A heater for an aerosol generating device, characterized in that: include: A first end and a second end opposite to each other; a tubular heating body extending from the first end to the second end; A first electrode and a second electrode are arranged at intervals along the circumference of the heating body to guide current in the circumference of the heating body; a first distance between the first electrode and / or the second electrode and the first end is smaller than a second distance between the first electrode and the second end; The second interval is greater than or equal to 1 / 2 of the axial length of the heating body.

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