Heating device, aerosol generating device, and aerosol generating system

Abstract

A heating device, an aerosol generating device, and an aerosol generating system are provided. The heating device includes a heat preservation assembly and an airflow heating assembly. The heat preservation assembly is internally provided with a receiving cavity. The receiving cavity is configured to accommodate an aerosol generation article. The airflow heating assembly is arranged in the receiving cavity. The airflow heating assembly is configured to heat gas flowing through the airflow heating assembly, so that the heated gas can heat the aerosol generation article placed in the receiving cavity. When the aerosol generation article is placed in the receiving cavity, heat of an inner wall surface of the heat preservation assembly can be transferred to a circumferential outer surface of the aerosol generation article for auxiliary heating.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a National Stage Entry under 35 U.S.C. § 371 of PCT International Application No. PCT / CN2023 / 106156 filed on Jul. 6, 2023, which claims priority to Chinese Patent Application No. 202210800951.1, filed with the China National Intellectual Property Administration on Jul. 8, 2022 and entitled “HEATING DEVICE, AEROSOL GENERATING DEVICE, AND AEROSOL GENERATING SYSTEM”, and claims priority to Chinese Patent Application No. 202320733081.0, filed with the China National Intellectual Property Administration on Mar. 24, 2023 and entitled “HEATING MECHANISM AND AEROSOL GENERATING DEVICE”, the entire contents of each of which are incorporated herein by reference for all purposes.TECHNICAL FIELD

[0002] Embodiments of this application relate to the technical field of aerosol generating devices, and in particular, to a heating device, an aerosol generating device, and an aerosol generating system.BACKGROUND

[0003] With the development and promotion of heat-not-burn technology, aerosol generating devices are increasingly more widely applied. The most important component in the aerosol generating device is a heating device, and an aerosol generation article is heated through the heating device, so that the aerosol generation article can generate smoke. In an existing product, a heating assembly is generally arranged at an air inlet end of the aerosol generation article for heating.

[0004] In the process of implementing embodiments of this application, the inventor found that such a design manner of arranging the heating assembly only at the air inlet end of the aerosol generation article may lead to a problem of uneven circumferential heating of the aerosol generation article.SUMMARY

[0005] Embodiments of this application are intended to provide a heating device, an aerosol generating device, and an aerosol generating system. A heat preservation assembly is attached to an aerosol generation article, so that heat of the heat preservation assembly heated by a heating assembly can be transferred to a circumferential outer surface of the aerosol generation article, so that the heat of the heat preservation assembly is effectively used, and parts and components of the heating device are reduced.

[0006] To resolve the above technical problem, a technical solution adopted by the embodiments of this application is to provide a heating device for heating an aerosol generation article, including a heat preservation assembly and an airflow heating assembly. The heat preservation assembly includes an inner tube portion and an outer tube portion. The inner tube portion is internally provided with a receiving cavity. The outer tube portion is arranged around the inner tube portion. The outer tube portion and the inner tube portion jointly define a cavity. An interior of the cavity is vacuum or filled with a medium with low thermal conductivity. The receiving cavity is configured to accommodate the aerosol generation article. The airflow heating assembly is arranged in the receiving cavity. The airflow heating assembly is configured to heat a gas flowing through the airflow heating assembly, so that the heated gas heats the aerosol generation article placed in the receiving cavity.

[0007] To resolve the above technical problem, another technical solution adopted by the embodiments of this application is to provide an aerosol generating device, including a housing, a circuit device, a sheath, and the heating device as described above. The housing is provided with a receiving space and a first socket. The first socket is communication with the receiving cavity. The receiving space is configured to accommodate the circuit device, the sheath, and the heating device. The sheath is sleeved outside the heating device. The sheath is configured to accommodate and support the heating device. The first socket is configured to allow insertion or removal of an external aerosol generation article into or from the sheath and the heating device. The circuit device is electrically connected to the heating device. The circuit device is configured to provide electric energy for the heating device.

[0008] To resolve the above technical problem, still another technical solution adopted by the embodiments of this application is to provide an aerosol generating system, including an aerosol generation article and the aerosol generating device as described above. The aerosol generating device is configured to allow insertion of the aerosol generation article. The aerosol generating device is configured to heat the aerosol generation article inserted into the receiving cavity. The aerosol generation article includes at least a tobacco section, a cooling section, and a mouthpiece section. The tobacco section, the cooling section, and the mouthpiece section are connected in sequence. When the aerosol generation article is inserted into the receiving cavity, an axial length of the tobacco section is equal to or slightly greater than a length of the tobacco section inserted into the receiving cavity.

[0009] The heating device in the embodiments of this application includes a heat preservation assembly and an airflow heating assembly. The heat preservation assembly is internally provided with a receiving cavity. The receiving cavity is configured to accommodate an aerosol generation article. The airflow heating assembly is arranged in the receiving cavity. The airflow heating assembly is configured to heat a gas flowing through the airflow heating assembly, so that the heated gas can heat the aerosol generation article placed in the receiving cavity. When the aerosol generation article is placed in the receiving cavity, an inner surface of the heat preservation assembly is substantially attached to a circumferential outer surface of the aerosol generation article, and heat of an inner wall surface of the heat preservation assembly can be transferred to the circumferential outer surface of the aerosol generation article for auxiliary heating, so that the heat of the heat preservation assembly is effectively used, and parts and components of the heating device are reduced.BRIEF DESCRIPTION OF THE DRAWINGS

[0010] One or more embodiments are exemplarily described with reference to the accompanying drawings corresponding to the embodiments, and the exemplary descriptions do not constitute a limitation on the embodiments. Elements in the accompanying drawings that have a same reference numeral are represented as similar elements, and unless otherwise particularly stated, the figures in the accompanying drawings are not drawn to scale.

[0011] FIG. 1 is a cross-sectional view of a viewing angle of a heating device according to an embodiment of this application.

[0012] FIG. 2 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to an embodiment of this application.

[0013] FIG. 3 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to another embodiment of this application.

[0014] FIG. 4 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to yet another embodiment of this application.

[0015] FIG. 5 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to still another embodiment of this application.

[0016] FIG. 6 is an exploded view of a viewing angle of a heating device according to an embodiment of this application.

[0017] FIG. 7 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a heating member.

[0018] FIG. 8 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a metal heating mesh.

[0019] FIG. 9 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a flexible printed circuit (FPC) heating film.

[0020] FIG. 10 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a resistive heating element.

[0021] FIG. 11 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is an induction coil.

[0022] FIG. 12 is a cross-sectional view of another viewing angle of a heating device according to an embodiment of this application.

[0023] FIG. 13 is a cross-sectional view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a heating circuit coating.

[0024] FIG. 14 is a cross-sectional view of a viewing angle of an aerosol generating system according to an embodiment of this application.

[0025] FIG. 15 is a cross-sectional view of a viewing angle of a housing and a sheath of an aerosol generating device according to an embodiment of this application.

[0026] FIG. 16 is an exploded view of a viewing angle of a sheath of an aerosol generating device according to an embodiment of this application.

[0027] FIG. 17 is an enlarged view of a portion A in FIG. 12.

[0028] FIG. 18 is a schematic diagram of a viewing angle of an end cap of an aerosol generating device according to an embodiment of this application.

[0029] FIG. 19 is a schematic diagram of a viewing angle of a second thermal insulation member of an aerosol generating device according to an embodiment of this application.

[0030] FIG. 20 is an enlarged view of a portion B in FIG. 12.

[0031] FIG. 21 is a cross-sectional view of a heating device according to Embodiment II of this application.

[0032] FIG. 22 is a cross-sectional view of a heat preservation assembly in a heating device according to Embodiment II of this application.

[0033] FIG. 23 is a cross-sectional view of a heat preservation assembly in another heating device according to Embodiment II of this application.

[0034] FIG. 24 is a cross-sectional view of another heating device according to Embodiment II of this application.DETAILED DESCRIPTION

[0035] For ease of understanding of this application, this application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described to be “fixed to” / “fixedly connected to” / “mounted to” another element, the element may be directly fixed to the another element, or one or more intermediate elements may exist therebetween. When one element is described to be “connected to” another element, the element may be directly connected to the another element, or one or more intermediate elements may exist therebetween. Terms “vertical”, “horizontal”, “left”, “right”, “inner”, “outside”, and similar expressions used in this specification are for illustrative purposes only.

[0036] Unless otherwise defined, meanings of all technical and scientific terms used in this specification are the same as that usually understood by a person skilled in the technical field to which this application belongs. Terms used in the specification of this application are merely intended to describe objectives of the specific embodiments, but are not intended to limit this application. A term “and / or” used in this specification includes any or all combinations of one or more related listed items.

[0037] In addition, the technical features involved in the different embodiments of this application described below may be combined with each other so long as they do not constitute a conflict with each other.

[0038] In this specification, the “mounting” includes fixing or limiting an element or a device to a specific position or place in a manner such as welding, screwing, snapping, or bonding. The element or the device may keep still at the specific position or place or move within a limited range. The element or the device may or may not be disassembled after being fixed or limited to the specific position or place, which is not limited in the embodiments of this application.Embodiment I

[0039] Referring to FIG. 1, a heating device 100 includes a heat preservation assembly 10 and an airflow heating assembly 20. An interior of the heat preservation assembly 10 is provided with a receiving cavity 11 in communication with an outside environment. The airflow heating assembly 20 is arranged at one end of the receiving cavity 11, and an other end of the receiving cavity 11 is configured to accommodate an aerosol generation article 2000. When the aerosol generation article 2000 is placed in the receiving cavity 11, an air inlet end of the aerosol generation article 2000 is close to the airflow heating assembly 20, and an inner surface of the heat preservation assembly 10 is substantially attached to a circumferential outer surface of the aerosol generation article 2000. The substantial attachment means that a distance L1 between the inner surface of the heat preservation assembly 10 and the circumferential outer surface of the aerosol generation article 2000 placed in the receiving cavity 11 is in a range of 0 mm≤L1≤2 mm. In some embodiments, the distance L1 satisfies 0.2 mm≤L1≤0.7 mm. In some embodiments, the distance L1 is 0.5 mm. The airflow heating assembly 20 is configured to heat a gas flowing through the airflow heating assembly 20, so that the heated gas heats the aerosol generation article 2000 placed in the receiving cavity 11. In addition, heat of the inner surface of the heat preservation assembly 10 heated by the airflow heating assembly 20 can be directly or indirectly transferred to an outer surface of the aerosol generation article 2000, so as to perform auxiliary heating on the aerosol generation article 2000 and make full use of the heat of the heat preservation assembly 10.

[0040] In some embodiments, still referring to FIG. 1, the heating device 100 further includes a temperature measurement element 30. The temperature measurement element 30 is arranged inside the airflow heating assembly 20. The temperature measurement element 30 is configured to measure a temperature of the airflow heating assembly 20, so as to facilitate real-time monitoring and control of the temperature of the airflow heating assembly 20.

[0041] For the heat preservation assembly 10 described above, referring to FIG. 2, the heat preservation assembly 10 includes an inner tube portion 12 and an outer tube portion 13. The inner tube portion 12 is provided with a receiving cavity 11. The outer tube portion 13 is arranged around the inner tube portion 12. A closed cavity 14 is jointly defined by the outer tube portion 13 and the inner tube portion 12. An interior of the closed cavity 14 is in a vacuum state, or filled with an inert gas with low thermal conductivity, so that a temperature of the outer tube portion 13 of the heat preservation assembly 10 is lower than a temperature of the inner tube portion 12, so as to play a role in thermal insulation. It is worth noting that when the interior of the closed cavity 14 is in the vacuum state, it does not mean that the interior of the closed cavity 14 is completely vacuum, but it should be understood that an air pressure in the closed cavity 14 is lower than the standard atmospheric pressure. To be specific, the closed cavity 14 is in a negative pressure state, and a degree of gas rarefaction in the closed cavity 14 is measured by a vacuum degree.

[0042] It may be understood that in some embodiments, referring to FIG. 3, a cavity 14 communicating with an outside environment is formed jointly by the outer tube portion 13 and the inner tube portion 12. The cavity 14 is filled with a medium with low thermal conductivity, for example, thermal insulation materials such as glass fiber, asbestos, rock wool, and silicate.

[0043] In some embodiments, referring to FIG. 4, the heat preservation assembly 10 may further include an abutting member 15. The abutting member 15 is arranged on an inner surface of the inner tube portion 12, and the abutting member 15 is located between a first chamber 111 and a second chamber 112. The abutting member 15 is configured to connect to the airflow heating assembly 20 to fix the airflow heating assembly 20 in the first chamber 111. In addition, the abutting member 15 further has a limiting effect on the airflow heating assembly 20 to prevent the airflow heating assembly 20 from entering the second chamber 112 beyond the first chamber 111 during mounting. In some embodiments, the abutting member 15 may be a convex rib, an engagement tooth, or the like.

[0044] In some embodiments, when the heating device 100 is in a normal operating state, the heat preservation assembly 10 meets at least one of the following conditions: the temperature of the inner tube portion 12 is in a range of 100° C. to 150° C., and the temperature of the outer tube portion 13 is in a range of 40° C. to 80° C.

[0045] In some embodiments, when the aerosol generation article 2000 is placed in the receiving cavity 11 and the heating device 100 is in normal operation, the inner tube portion 12 meets at least one of the following conditions: the temperature of an end of the inner tube portion 12 close to the aerosol generation article 2000 is in a range of 100° C. to 120° C., and the temperature of an end of the inner tube portion 12 close to the airflow heating assembly 20 is in a range of 120° C. to 150° C.

[0046] For the above receiving cavity 11, still referring to FIG. 2, the receiving cavity 11 is provided with a first chamber 111 and a second chamber 112, and the first chamber 111 and the second chamber 112 are in communication with each other along a first direction X. The first direction X is parallel to a center line of the heat preservation assembly 10. The first chamber 111 is configured to allow mounting of the airflow heating assembly 20, and the second chamber 112 is configured to allow mounting of the aerosol generation article 2000. When the aerosol generation article 2000 is mounted in the second chamber 112, and a user sucks an air outlet end of the aerosol generation article 2000 (the air inlet end and the air outlet end are respectively arranged on two ends of the aerosol generation article 2000), a negative pressure is generated inside the aerosol, and an external gas flows through the airflow heating assembly 20 and is heated by the airflow heating assembly 20, and then enters the aerosol generation article 2000 from the air inlet end to complete heating of the aerosol generation article 2000.

[0047] In some embodiments, still referring to FIG. 2, a cross-sectional area of the first chamber 111 is greater than a cross-sectional area of the second chamber 112, so that the receiving cavity 11 is in a shape of a step, which may be beneficial to ensure that an inner wall surface of the second chamber 112 is substantially attached to the circumferential outer surface of the aerosol generation article 2000 when an outer contour of the airflow heating assembly 20 along the first direction X is larger than an outer contour of the aerosol generation article 2000 along the first direction X. In addition, it is convenient for the airflow heating assembly 20 to be mounted in the first chamber 111. A cross section of the first chamber 111 and a cross section of the second chamber 112 are both perpendicular to the first direction X. It may be understood that in some embodiments, an inner diameter of the receiving cavity 11 along the first direction X may also be the same.

[0048] In the embodiment of this application, the receiving cavity 11 extends through the inner tube portion 12 along the first direction X, that is, openings at both ends of the receiving cavity 11 in communication with the outside environment are respectively located at both ends of the heat preservation assembly 10. It may be understood that in some other embodiments, referring to FIG. 4, an arrow represents an airflow direction. The heat preservation assembly 10 further includes a peripheral plate 16. The peripheral plate 16 is arranged on an outer side of the outer tube portion 13, so that the openings of the receiving cavity 11 in communication with the outside environment may be both located at the same end of the heat preservation assembly 10. An air inlet channel is formed between the peripheral plate 16 and the outer tube portion 13. A gas absorbs heat from the outer tube portion 13 while flowing through the air inlet channel, so that the gas is preheated before entering the air guide channel 211.

[0049] For the above airflow heating assembly 20, referring to FIG. 6, the airflow heating assembly 20 includes an air guide element 21 and a heating element 22. The air guide element 21 is configured to allow gas flow, and the heating element 22 is configured to heat the air guide element 21, or the air guide element 21 spontaneously generates heat under the action of the heating element 22, thereby heating the gas flowing through the air guide element 21.

[0050] In the embodiment of this application, the air guide element 21 is made of graphite, and the air guide element 21 has good thermal conductivity, which is beneficial to improve heating efficiency. In some embodiments, the air guide element 21 is made of a graphite alloy. The graphite alloy has good magnetic conductivity and relatively high thermal conductivity. The good magnetic conductivity causes the heating element 22 to adopt an electromagnetic heating mode in addition to a resistive heating mode, so that the air guide element 21 can also generate heat, which increases an optional heating solution. The relatively high thermal conductivity can effectively reduce time required for the heating element 22 to heat the air guide element 21 to a predetermined temperature, so as to improve heating efficiency of the airflow heating assembly 20.

[0051] Referring to FIG. 7, the air guide element 21 is provided with a second mounting groove 212 and at least one air guide channel 211 extending through the air guide element, and the air guide channel 211 enables an external gas to flow from one end of the air guide element 21 to an other end of the air guide element 21. In the embodiment of this application, the air guide channel 211 extends through the air guide element 21 along the first direction X, and a plurality of air guide channels 211 are provided. In some other embodiments, a shape of the air guide channel 211 may be an irregular shape. For example, the air guide channel 211 may be inclined, spiral, or winding in shape inside the air guide element 21, as long as the external gas flows through the air guide channel 211 from one end of the air guide element 21 to the other end of the air guide element 21. The second mounting groove 212 is located in the center of a cross section of the air guide element 21. The second mounting groove 212 is configured to allow mounting of the temperature measurement element 30. The cross section of the air guide element 21 is perpendicular to the first direction X. The second mounting groove 212 is arranged in a central position of the cross section of the air guide element 21, so that temperature data measured by the temperature measurement element 30 may be closer to a temperature at which air is heated, thereby improving accuracy of temperature control of the airflow heating assembly 20. Certainly, in some embodiments, the second mounting groove 212 is an air guide channel 211 located in the center of the cross section of the air guide element 21, and the temperature measurement element 30 is arranged in the air guide channel 211.

[0052] The plurality of air guide channels 211 are in a shape of a cylinder, and a diameter D1 of each of the air guide channels 211 satisfies 0<D1≤0.5 mm. By adopting a scheme of small-diameter air guide channels 211, on the one hand, the number of air guide channels 211 may be increased, and on the other hand, the heating efficiency of the gas flowing through the air guide channels 211 may be improved, to prevent a gas flow from being large and a poor gas heating effect as a result of an excessively large diameter of the air guide channel 211.

[0053] A ratio of a sum of the areas of the cross sections of the plurality of air guide channels 211 to the area of the cross section of the air guide element 21 is greater than or equal to 1 / 5. The cross section of the air guide channel 211 is within the cross section of the air guide element 21, and the cross sections of the air guide channel 211 and the air guide element 21 are both perpendicular to the center line of the air guide element 21. On the premise of satisfying structural stability of the air guide element 21, when the ratio of the area of the cross section of the air guide channel 211 to the area of the cross section of the air guide element 21 is closer to 1, it indicates a larger effective area of the air guide channel 211 and a larger available gas flow area. When the area of the cross section of a single air guide channel 211 is fixed, a larger quantity of air guide channels 211 may be provided on the air guide element 21.

[0054] A plurality of air guide channels 211 are arranged around the center of the air guide element 21, and a ratio of a quantity of air guide channels 211 located in an inner rim to a quantity of air guide channels 211 located in an outer rim is equal to a ratio of a radius of the inner rim to a radius of the outer rim. Along a direction that the center of the cross section of the air guide element 21 points to an edge of the cross section of the air guide element 21, a growing quantity of air guide channels 211 that may be provided leads to an increase in flow channels of gas. In some embodiments, the plurality of air guide channels 211 are arranged in a circumferential array, that is, a distance between two adjacent air guide channels 211 located in the same rim is equal.

[0055] The air guide element 21 satisfies at least one of the following conditions: (1) a diameter D3 of the air guide element 21 is in a range of 4 mm≤D3≤8 mm; (2) the diameter D3 of the air guide element 21 is in a range of 6 mm≤D3≤7 mm; (3) a cross-sectional area S1 of the air guide element 21 is in a range of 10 mm≤S1≤50 mm2; (4) the cross-sectional area S1 of the air guide element 21 is in a range of 25 mm≤S1≤35 mm2; (5) an axial length L1 of the air guide element 21 is in a range of 5 mm≤L1≤10 mm; and (6) the axial length L1 of the air guide element 21 is in a range of 7 mm≤L1≤9 mm.

[0056] In the embodiment of this application, the cross-sectional area of the air guide element 21 is the same as the cross-sectional area of the second chamber 112, so that the air guide element 21 covers the air inlet end of the aerosol generation article 2000 accommodated in the second chamber 112 as much as possible, to ensure that the air heated by the air guide element 21 has a larger heating area for the aerosol generation article 2000. Since the cross-sectional area of the first chamber 111 is greater than the cross-sectional area of the second chamber 112, the heating element 22 may be arranged on a circumferential outer side of the air guide element 21. Certainly, in some embodiments, the heating element 22 may be mounted by reducing part of the outer diameter of the air guide element 21, so that a gap is defined between the air guide element 21 and the heat preservation assembly 10, causing the cross-sectional area of the first chamber 111 to be consistent with the cross-sectional area of the second chamber 112, which is convenient for processing and manufacturing of the heat preservation assembly 10.

[0057] In some embodiments, still referring to FIG. 7, the air guide element 21 includes a first air guide block 213 and a second air guide block 214. The first air guide block 213 is provided with a first groove 2131, and the second air guide block 214 is provided with a second groove 2141. When the first air guide block 213 and the second air guide block 214 are spliced, the first groove 2131 and the second groove 2141 jointly define the above second mounting groove 212. The air guide element 21 adopts a split design, which may help the temperature measurement element 30 to be mounted in the second mounting groove 212 more easily, and improve assembly efficiency of the heating device 100.

[0058] In some embodiments, still referring to FIG. 7, the air guide element 21 is provided with a first mounting groove 215. The first mounting groove 215 is configured to allow mounting of the heating element 22. At least one first mounting groove 215 is provided. When one first mounting groove 215 is provided, the first mounting groove 215 is provided in the center of the air guide element 21. The heating element 22 is arranged in the center of the air guide element 21, so that a characteristic that the heating element 22 transfers heat in bursts may be fully utilized, and heat loss of the heating element 22 may be reduced. When a quantity of first mounting grooves 215 is two or more, two or more first mounting grooves 215 are arranged around the center of the air guide element 21. To be specific, the first mounting grooves 215 are located between the center of the air guide element 21 and the edge of the air guide element 21, and the heating element 22 may be mounted in each of the first mounting grooves 215. The first mounting groove 215 is provided between the center and the edge of the air guide element 21, so that the heating element 22 can quickly heat the air guide element 21, and a degree of heating between the center and the edge of the air guide element 21 is relatively uniform. Certainly, the first mounting groove 215 may be provided as a through groove or a blind groove based on an actual situation.

[0059] A diameter D2 of the first mounting groove 215 satisfies the following requirements: 0 mm<D2≤1.7 mm. On the premise that the heating member 20 can be mounted in the first mounting groove 215, a smaller diameter of the first mounting groove 215 leads to a more favorable increase in the quantity of air guide channels 211.

[0060] In some embodiments, still referring to FIG. 7, a circumferential outer surface of the air guide element 21 is provided with a first mounting region 216 and a second mounting region 217. The first mounting region 216 is configured to connect to the inner surface of the inner tube portion 12 of the heat preservation assembly 10 through interference fit, and the air guide element 21 is fixed to the inner tube portion 12 under the action of friction. In some embodiments, the first mounting region 216 is provided with a first protrusion 2161. The first protrusion 2161 abuts against the inner surface of the inner tube portion 12 of the heat preservation assembly 10 to form line contact or point contact. Certainly, in some other embodiments, the first mounting region 216 may be connected to the inner tube portion 12 in another connection manner, such as bonding.

[0061] The second mounting region 217 does not abut against the inner surface of the inner tube portion 12 of the heat preservation assembly 10. A gap is formed between the second mounting region 217 and the inner tube portion 12, which may reduce a contact area between the air guide element 21 and the inner tube portion 12, and prevent the heat of the air guide element 21 from being transferred to the inner tube portion 12 of the heat preservation assembly 10 excessively fast. In some embodiments, the second mounting region 217 may be configured to allow mounting of the heating element 22, and the heating element 22 is sleeved on an outer surface of the second mounting region 217 to heat the air guide element 21 from outside to inside. The heating element 22 is arranged in the second mounting region 217, so that a structural layout among the heating element 22, the air guide element 21, and the heat preservation assembly 10 can be more compact on the premise that the heating element 22 meets a heating function.

[0062] For the above heating element 22, in some embodiments, referring to FIG. 8 and FIG. 9, the heating element 22 includes a metal heating mesh 221 or a flexible printed circuit (FPC) heating film 222. The metal heating mesh 221 or the FPC heating film 222 is at least partially arranged around an outer peripheral surface of the air guide element 21, and both the metal heating mesh 221 and the FPC heating film 222 are electrically connected to an external power supply. When the external power supply supplies power to the metal heating mesh 221 or the FPC heating film 222, the metal heating mesh 221 or the FPC heating film 222 can generate heat, thereby heating the air guide element 21. Surfaces of the metal heating mesh 221 and the FPC heating film 222 are both subjected to oxidation treatment or electrical insulation treatment, so that the metal heating mesh 221 or the FPC heating film 222 only conducts heat to the outside but does not conduct electricity.

[0063] In some embodiments, referring to FIG. 10, the heating element 22 includes a resistive heating element 223, a first insulating layer 224, and a second insulating layer 225. The resistive heating element 223 is at least partially arranged on the outer peripheral surface of the air guide element 21, the first insulating layer 224 is arranged between the air guide element 21 and the resistive heating element 223, and the second insulating layer 225 is arranged between the resistive heating element 223 and the inner surface of the inner tube portion 12 of the heat preservation assembly 10. The resistive heating element 223 is electrically connected to the external power supply. When the external power supply supplies power to the resistive heating element 223, the resistive heating element 223 can generate heat, thereby heating the air guide element 21. The first insulating layer 224 and the second insulating layer 225 are both configured to electrically insulate the resistive heating element 223, so as to prevent a situation of electric leakage as a result of the electric energy from the external power supply being conducted to the air guide element 21 or the heat preservation assembly 10, thereby improving safety of the heating device 100.

[0064] In some embodiments, the first insulating layer 224 and the second insulating layer 225 are also adhesive to fix the resistive heating element 223 and the air guide element 21 in the first chamber 111 of the receiving cavity 11. Specifically, the first insulating layer 224 fixes the air guide element 21 to the resistive heating element 223, and the second insulating layer 225 fixes the resistive heating element 223 to the inner tube portion 12 of the heat preservation assembly 10.

[0065] In some embodiments, referring to FIG. 11, the heating element 22 includes an induction coil 226. The induction coil 226 is sleeved on a circumferential outer surface of the air guide element 21, and the induction coil 226 is electrically connected to an external power supply. When the external power supply supplies power to the induction coil 226, the induction coil 226 generates an alternating magnetic field. When the air guide element 21 with good magnetic conductivity is located in the alternating magnetic field, the air guide element can generate heat, thereby heating air flowing through the air guide element 21.

[0066] In some embodiments, still referring to FIG. 11, the heating element 22 further includes a bracket 227. The bracket 227 is in a shape of a cylinder. The induction coil 226 is wound around the bracket 227. The bracket 227 is sleeved on an outer side of the air guide element 21. The bracket 227 is configured to support the induction coil 226 to prevent the induction coil 226 from being deformed.

[0067] In some embodiments, still referring to FIG. 11, the heating element 22 further includes a magnetic field shielding layer 228. The magnetic field shielding layer 228 is arranged between the induction coil 226 and the inner tube portion 12 of the heat preservation assembly 10. The magnetic field shielding layer 228 is configured to shield influence of the alternating magnetic field generated by the energized induction coil 226 on the inner tube portion 12, to reduce heat generated in the inner tube portion 12.

[0068] In some embodiments, referring to FIG. 7, the heating element 22 includes a heating member 229. The heating member 229 is arranged in the first mounting groove 215. The heating member 229 is a columnar body of resistive heating type. The heating member 229 is electrically connected to an external power supply. When the heating member 229 is arranged in the first mounting groove 215, the heating member 229 transfers heat outward in bursts. Compared with the heating mode from outside to inside, the heating member 229 has less energy consumption loss and a high heat utilization rate.

[0069] In some embodiments, the heating member 229 is spirally formed by a resistive heating wire, or the heating member 229 is cylindrical with a vent air gap, and a hollow state of the heating member 229 may facilitate flow of the gas in the first mounting groove 215 and increase the contact area between the air and the air guide element 21.

[0070] The heating member 229 satisfies at least one of the following conditions: (1) a diameter D4 of the heating member 229 satisfies 1 mm≤D4≤2 mm; (2) the diameter D4 of the heating member 229 satisfies 1.4 mm≤D4≤1.7 mm; (3) an area S2 defined by an outer contour of a cross section of the heating member 229 is in a range of 0.7 mm≤S2≤3.5 mm2, where the cross section of the air guide element 21 is perpendicular to the center line of the air guide element 21; and (4) an axial length L2 of the heating member 229 is in a range of 4 mm≤L2≤9 mm.

[0071] It is worth noting that in some embodiments, when the first mounting groove 215 provided with the heating member 229 and the second mounting groove 212 provided with the temperature measurement element 30 are both located in the center of the air guide element 21, the first mounting groove 215 and the second mounting groove 212 are the same mounting groove. The heating member 229 and the temperature measurement element 30 are both located in the mounting groove. In this case, the temperature measurement element 30 performs temperature measurement by using a temperature coefficient of resistance (TCR). Certainly, in some other embodiments, the temperature measurement element 30 may further perform temperature measurement by using a negative temperature coefficient (NTC), a thermistor, and a thermocouple.

[0072] In some embodiments, referring to FIG. 12 and FIG. 13, the heating element 22 is a heating circuit coating 230. The heating circuit coating 230 is applied onto an inner wall surface of the inner tube portion 12, and the heating circuit coating 230 is electrically connected to an external power supply through a wire. When the air guide element 21 is mounted to the first chamber 111, the outer peripheral surface of the air guide element 21 at least partially abuts against the heating circuit coating 230. The heating circuit coating 230 is configured to heat the air guide element 21. The heating circuit coating 230 has characteristics of a thin coating and high heating efficiency, which may reduce a volume of the airflow heating assembly 20. In addition, the heating circuit coating 230 is directly applied onto the inner surface of the inner tube portion 12 and integrated with the heat preservation assembly 10, so that a quantity of parts may be reduced, and the mounting is more convenient.

[0073] It is worth noting that, in order to save power consumption of the heating element 22, in the embodiment of this application, only the above heating circuit coating 230 is applied onto the inner wall surface of the first chamber 111, and the above heating circuit coating 230 is not applied onto the inner wall surface of the second chamber 112. Due to the high thermal conductivity of the air guide element 21, the heating circuit coating 230 applied onto the inner wall surface of the first chamber 111 may lead to a relatively high thermal conductivity, less heat loss, and short heating time. However, if the heating circuit coating 230 is arranged on the inner wall surface of the second chamber 112, the thermal conductivity of the circumferential outer surface of the aerosol generation article is relatively low, and the heat loss of the heating element 22 is relatively high, which helps to heat the aerosol generation article, but increases the power consumption of the heating element 22.

[0074] In some embodiments, referring to FIG. 7, the airflow heating assembly 20 further includes a first thermal insulation member 23. The first thermal insulation member 23 is arranged in the first mounting region 216. When the air guide element 21 with the first thermal insulation member 23 sleeved thereon is mounted to the inner tube portion 12 of the heat preservation assembly 10, an inner side and an outer side of the first thermal insulation member 23 respectively abut against an inner surface of the air guide element 21 and the inner surface of the inner tube portion 12. The air guide element 21 is fixed to the inner tube portion 12 under the action of friction between the first thermal insulation member 23 and the inner tube portion 12.

[0075] In the embodiment of this application, the first thermal insulation member 23 is made of ZrO2 (zirconium dioxide) and a compound thereof, and the first thermal insulation member 23 has at least characteristics of high temperature resistance, low thermal conductivity, and corrosion resistance. In some other embodiments, the first thermal insulation member 23 may also be made of a thermal insulation material such as metal and / or non-metal and a compound thereof.

[0076] When only the first mounting region 216 is provided with the first protrusion 2161, the first mounting region 216 of the air guide element 21 abuts against the inner surface of the first thermal insulation member 23 to form line contact or point contact, thereby reducing the contact area. In this case, heat transferred directly from the air guide element 21 to the first thermal insulation member 23 is less than heat transferred when the first mounting region 216 directly contacts the inner surface of the first thermal insulation member 23, which may effectively reduce the heat loss of the air guide element 21 and improve thermal efficiency.

[0077] In some embodiments, an outer surface of the first thermal insulation member 23 may also be provided with a first protrusion 2161, so that when the outer surface of the first thermal insulation member 23 abuts against the inner surface of the inner tube portion 12, the line contact or the point contact is formed, thereby reducing the contact area. Compared with the solution of only providing the first protrusion 2161 in the first mounting region 216, the solution of providing the first protrusion 2161 on the outer surface of the first thermal insulation member 23 further reduces the heat loss of the air guide element 21. Certainly, the solution of only providing the first protrusion 2161 on the outer surface of the first thermal insulation member 23 is also within the protection scope of this application. In some embodiments, the first protrusion 2161 may be directly arranged on the inner surface and the outer surface of the first thermal insulation member 23 to facilitate manufacturing of the first thermal insulation member 23.

[0078] In the embodiment of this application, the first thermal insulation member 23 includes a first split member 231 and a second split member 232. The first split member 231 covers part of the first mounting region 216, and the second split member 232 covers part of the first mounting region 216. The first split member 231 and the second split member 232 are spliced to form a cavity for allowing mounting of the air guide element 21. Certainly, the first split member 231 and the second split member 232 may not completely cover the first mounting region 216 after being spliced, and may partially cover the first mounting region 216. A main purpose of arranging the first split member 231 and the second split member 232 is to facilitate the mounting and removal of the first thermal insulation member 23 and the air guide element 21. It is worth noting that in some other embodiments, the first thermal insulation member 23 may be divided into three or more separate members.

[0079] In order to help readers more easily understand the technical effects brought about by the technical solutions of the embodiments of this application, the operating principle of the heating device 100 is briefly described below.

[0080] When the aerosol generation article 2000 is accommodated in the receiving cavity 11 of the heat preservation assembly 10, part of the circumferential outer surface of the aerosol generation article 2000 is substantially attached to the inner surface of the inner tube portion 12. When the external power supply supplies power to the heating element 22, the heating element 22 heats the air guide element 21 or the air guide element 21 generates heat by self-heating under the action of the heating element 22, air flowing through a channel of the air guide element 21 is heated, and the heated air enters the interior of the aerosol generation article 2000 from the air inlet end of the aerosol generation article 2000 for heating. In addition, the inner tube portion 12 of the heat preservation assembly 10 is heated by the heating assembly and has a certain amount of heat. Since part of the circumferential outer surface of the aerosol generation article 2000 is substantially attached to the inner surface of the inner tube portion 12, the heat of the inner tube portion 12 can be transferred to part of the circumferential outer surface of the aerosol generation article 2000, to perform auxiliary heating on the aerosol generation article 2000, so that the aerosol generation article 2000 is heated more evenly.

[0081] The heating device 100 in the embodiments of this application includes a heat preservation assembly 10 and an airflow heating assembly 20. The heat preservation assembly 10 is internally provided with a receiving cavity 11. The receiving cavity 11 is configured to accommodate an aerosol generation article 2000. The airflow heating assembly 20 is arranged in the receiving cavity 11. The airflow heating assembly 20 is configured to heat a gas flowing through the airflow heating assembly 20, so that the heated gas heats the aerosol generation article 2000 placed in the receiving cavity 11. When the aerosol generation article 2000 is placed in the receiving cavity 11, an inner surface of the heat preservation assembly 10 is substantially attached to a circumferential outer surface of the aerosol generation article 2000, and heat of an inner wall surface of the heat preservation assembly 10 can be transferred to the circumferential outer surface of the aerosol generation article 2000 for auxiliary heating, so that the heat of the heat preservation assembly 10 is effectively used to heat the circumferential outer surface of the aerosol generation article 2000, and parts and components of the heating device 100 are reduced.

[0082] Based on the same inventive concept, referring to FIG. 14, this application further provides an aerosol generating device 1000, including a housing 200, a circuit device 300, a sheath 400, and the above heating device 100. The sheath 400 is sleeved on an outer side of the heating device 100, and the sheath 400 is configured to accommodate and support the heating device 100. The circuit device 300, the sheath 400, and the heating device 100 are all accommodated in the housing 200, and the circuit device 300 is electrically connected to the heating device 100. The circuit device 300 is configured to provide electric energy for the heating device 100, so that the heating device 100 can heat the aerosol generation article 2000. The housing 200 is configured to accommodate and fix the circuit device 300 and the sheath 400.

[0083] For the above housing 200, referring to FIG. 15, the housing 200 is provided with a receiving space 201, a first socket 202, a separating plate 203, and a fourth through hole 204. The separating plate 203 is arranged in the receiving space 201, and the separating plate 203 separates the receiving space 201 into a first accommodating cavity 2011 and a second accommodating cavity 2012 arranged in a top-to-bottom direction. The first accommodating cavity 2011 is configured to accommodate the sheath 400, the heating device 100, and part of the circuit device 300. The second accommodating cavity 2012 is configured to accommodate part of the circuit device 300. The first socket 202 is arranged on a side wall of the housing 200, and the first socket 202 brings the first accommodating cavity 2011 into communication with an outside environment. In addition, the first socket 202 is in communication with the receiving cavity 11 of the heat preservation assembly 10 in the heating device 100. The first socket 202 is configured to allow insertion or removal of the aerosol generation article 2000 into or from the receiving cavity 11 of the heat preservation assembly 10 in the heating device 100. In some embodiments, the first accommodating cavity 2011 and the second accommodating cavity 2012 are sealed to improve airtightness of the second accommodating cavity 2012 and reduce a possibility that operating performance of the circuit device 300 accommodated in the second accommodating cavity 2012 is affected by the outside environment or the gas in the heating device 100. The fourth through hole 204 is provided on the side wall of the housing 200. The fourth through hole 204 brings the first accommodating cavity 2011 into communication with the outside environment. The fourth through hole 204 is configured for exposure of part of the circuit device 300, so that the external power supply can be electrically connected to the circuit device 300. The fourth through hole 204 is further configured to allow an external gas to enter the first accommodating cavity 2011, so as to enter the heating device 100 to be heated.

[0084] For the foregoing circuit device 300, referring to FIG. 14 and FIG. 15, the circuit device 300 includes a printed circuit board (PCB) 301, a battery module 302, and a charging interface 303. The PCB 301 and the charging interface 303 are both arranged in the first accommodating cavity 2011, and the charging interface 303 is exposed at the fourth through hole 204. The battery module 302 is disposed in the second accommodating cavity 2012. The PCB 301 is electrically connected to the heating element 22, the temperature measurement element 30, the battery module 302, and the charging interface 303 in the heating device 100. The PCB 301 is configured to perform parameter control and data acquisition on the heating element 22 and the temperature measurement element 30. The battery module 302 is configured to supply electric energy to the heating element 22 and the temperature measurement element 30, and the charging interface 303 is configured for insertion of an external power connector to realize charging of the battery module 302 or directly supply electric energy to the heating element 22 and the temperature measurement element 30 by using the external power supply.

[0085] In some embodiments, the charging interface 303 may not be provided, and the battery module 302 may use a detachable lithium battery, or the like. In some embodiments, two or more PCB 301 are arranged. The two or more PCB 301 are stacked in parallel in the first accommodating cavity 2011, and the PCB 301 and the sheath 400 are arranged in the first accommodating cavity 2011 in a left-to-right direction, so that a layout of the PCB 301 and the sheath 400 is more reasonable.

[0086] In some embodiments, sealing treatment may be performed between the first accommodating cavity 2011 and the second accommodating cavity 2012 based on actual requirements, to prevent a gas generated by the air guide element 21 in the first accommodating cavity 2011 heating the aerosol generation article 2000 from entering the second accommodating cavity 2012 and affecting the operating performance of the battery module 302.

[0087] For the above sheath 400, referring to FIG. 14 to FIG. 16, the sheath 400 includes an upper shell 402 and a lower shell 403. The upper shell 402 and the lower shell 403 jointly define a first mounting cavity 401. The first mounting cavity 401 is configured to accommodate the heating device 100 and allow insertion of an aerosol generation article 2000. An end of the upper shell 402 facing away from the lower shell 403 is further provided with a second socket 4021. The second socket 4021 brings the first mounting cavity 401 into communication with the outside environment. The second socket 4021 is in direct communication with the first socket 202, so that the external aerosol generation article 2000 can enter the first mounting cavity 401 through the first socket 202 and the second socket 4021, and then enter the receiving cavity 11 of the heat preservation assembly 10 in the heating device 100.

[0088] An inner surface of the first mounting cavity 401 is provided with a first convex rib 4011, a step surface 4012, and a second convex rib 4013. At least one first convex rib 4011 is arranged. The at least one first convex rib 4011 extends from the second socket 4021 toward a cavity bottom of the first mounting cavity 401. The first convex rib 4011 is configured to abut against the outer surface of the aerosol generation article 2000 inserted into the first mounting cavity 401. The first convex rib 4011 supports the aerosol generation article 2000 relative to the inner surface of the first mounting cavity 401 to form an air guide groove. The air guide groove is configured to allow an external gas to enter the first mounting cavity 401. The first convex rib 4011 is further configured to abut against the outer surface of the outer tube portion 13 of the heat preservation assembly 10. The first convex rib 4011 supports the heat preservation assembly 10 relative to the inner surface of the first mounting cavity 401 to form the air guide groove, so that the external gas can smoothly enter the cavity bottom of the first mounting cavity 401.

[0089] The step surface 4012 is arranged on the inner surface of the first mounting cavity 401. The step surface 4012 is configured to abut against one end of the heat preservation assembly 10 in the heating device 100. The step surface 4012 and the cavity bottom of the first mounting cavity 401 jointly fix the heat preservation assembly 10 in the first mounting cavity 401. Certainly, an air guide groove is still formed at a position where one end of the heat preservation assembly 10 abuts against the step surface 4012. The second convex rib 4013 is arranged at the cavity bottom of the first mounting cavity 401, and the second convex rib 4013 supports an other end of the heat preservation assembly 10 relative to the cavity bottom to form an air guide groove, so that the gas entering the cavity bottom of the first mounting cavity 401 can enter the air guide element 21 to be heated.

[0090] The lower shell 403 is provided with a second mounting cavity 4031 and a first through hole 4032. The second mounting cavity 4031 is provided on an outer side of the lower shell 403, and the first through hole 4032 extends through a side wall of the lower shell 403 to extend through the first mounting cavity 401 and the second mounting cavity 4031. The second mounting cavity 4031 is configured to accommodate the PCB 301. The first through hole 4032 is configured to allow a cable connecting the PCB 301 to the heating element 22 and the temperature measurement element 30 in the heating device 100 to pass through, and / or for the external gas to enter the second mounting cavity 4031 from the fourth through hole 204 and then enter the cavity bottom of the first mounting cavity 401 from the second mounting cavity 4031 to be heated in the air guide element 21.

[0091] In some embodiments, the upper shell 402 and the lower shell 403 may be integrally formed. In some embodiments, referring to FIG. 17 and FIG. 18, the aerosol generating device 1000 further includes an end cap 500. The end cap 500 is arranged at the cavity bottom of the first mounting cavity 401. Two ends of the end cap 500 respectively abut against the air guide element 21 of the heating device 100 and the second convex rib 4013. The end cap 500 is made of a material with low thermal conductivity, and the end cap 500 is configured to prevent the air guide element 21 from directly contacting the cavity bottom of the first mounting cavity 401 and transferring heat to the lower shell 403 excessively fast. The end cap 500 is provided with a second through hole 501 and a third convex rib 502. The second through hole 501 is configured to allow the gas at the cavity bottom of the cavity to flow to the air guide element 21 and allowing the cable connecting the PCB 301 to the heating element 22 and the temperature measurement element 30 in the heating device 100 to pass through.

[0092] In some embodiments, referring to FIG. 17 and FIG. 19, the aerosol generating device 1000 further includes a second thermal insulation member 600. The second thermal insulation member 600 is arranged on a side of the end cap 500 facing the heating device 100, that is, the second thermal insulation member 600 is located between the air guide element 21 and the end cap 500. The second thermal insulation member 600 is made of a material with low thermal conductivity. The second thermal insulation member 600 is configured to reduce heat transferred from the air guide element 21 to the end cap 500. The second thermal insulation member 600 is provided with a third through hole 601 and a fourth convex rib 602. The third through hole 601 is configured to allow a gas to flow and for allowing the cable connecting the PCB 301 to the heating element 22 and the temperature measurement element 30 in the heating device 100 to pass through. The third convex rib 502 forms point contact with the second thermal insulation member 600, and the fourth convex rib 602 is arranged at an end of the second thermal insulation member 600 close to the air guide element 21. The fourth convex rib 602 is configured to form point contact with the air guide element 21.

[0093] In the embodiment of this application, the second thermal insulation member 600 and the end cap 500 are arranged between the air guide element 21 and the cavity bottom of the first mounting cavity 401 for double thermal insulation, and the second thermal insulation member 600 is connected to the air guide element 21 and the end cap 500, and the end cap 500 is connected to the cavity bottom both in a manner of point contact, thereby effectively reducing the heat directly transferred by the air guide element 21 to the lower shell 403. On the one hand, the sheath 400 can operate in a relatively low temperature environment, thereby effectively prolonging a service life of the sheath 400. On the other hand, the heat loss of the air guide element 21 can be effectively reduced, and the thermal efficiency of the air guide element 21 is improved. It may be understood that, in some embodiments, the second thermal insulation member 600 and the end cap 500 may be integrally formed.

[0094] In the embodiment of this application, the second thermal insulation member 600 and the end cap 500 are made of ZrO2 (zirconium dioxide) and a compound thereof, and the second thermal insulation member 600 and the end cap 500 have at least characteristics of high temperature resistance, low thermal conductivity, and corrosion resistance. In some other embodiments, the second thermal insulation member 600 and / or the end cap 500 may also be made of a thermal insulation material such as metal and / or non-metal and a compound thereof, to reduce production costs.

[0095] Based on the same inventive concept, this application further provides an embodiment of an aerosol generating system 10000. Referring to FIG. 14 and FIG. 20, the aerosol generating system 10000 includes an aerosol generation article 2000 and the above aerosol generating device 1000. The aerosol generating device 1000 is configured for insertion of the aerosol generation article 2000, and the aerosol generating device 1000 heats the aerosol generation article 2000 to generate smoke for a user to inhale. The aerosol generation article 2000 includes at least a tobacco section 2001, a cooling section 2002, and a mouthpiece section 2003. The tobacco section 2001, the cooling section 2002, and the mouthpiece section 2003 are connected in sequence, and when the aerosol generation article 2000 is inserted into the receiving cavity 11 of the heat preservation assembly 10, an axial length L2 of the tobacco section 2001 is equal to or slightly greater than a length L3 of the tobacco section 2001 inserted into the receiving cavity 11, to ensure that the cooling section 2002 is not heated by the inner tube portion 12 of the heat preservation assembly 10, thereby affecting cooling performance of the cooling section 2002. The axial length L2 of the tobacco section 2001 being slightly greater than the length L3 of the tobacco section 2001 inserted into the receiving cavity 11 means that a difference between the axial length L2 of the tobacco segment 2001 and the length L3 of the tobacco section 2001 inserted into the receiving cavity 11 is in a range of 0.5 mm≤L2−L3≤2 mm. It may be understood that the aerosol generation article 2000 may further include another section, for example, a filter section, an essential oil section, a filter tip section, or the like.Embodiment II

[0096] Mainly referring to FIG. 21, a heating device 100a includes a tubular body 10a, an airflow channel 30a, and an airflow heating assembly 20a. The tubular body 10a has a containing cavity inside. The containing cavity is configured to receive at least part of an aerosol generation article 2000. The airflow channel 30a is in fluid communication with the containing cavity, and air enters the containing cavity through the airflow channel.

[0097] In an example, as shown in FIG. 21, the air enters the containing cavity from a distal end of the containing cavity. It may be understood that in another example, the air may further enter the containing cavity from a middle region of the containing cavity.

[0098] In an example, at least part of the airflow channel 30a is located inside the tubular body 10a, and the airflow heating assembly 20a is arranged in the airflow channel 30a. The air flowing through the airflow channel 30a flows through the airflow heating assembly 20a, so that the airflow heating assembly 20a can heat the air flowing through the airflow channel 30a. In another example, the airflow channel is located outside the tubular body, at least part of the airflow channel may be defined by an air channel tube, the airflow heating assembly may be located in the airflow channel, or the airflow heating assembly may be arranged around the air channel tube.

[0099] The airflow heating assembly 20a is configured to heat the air flowing through the airflow channel 30a into hot air, and the hot air may flow into an interior of the aerosol generation article 2000 from a distal end of the aerosol generation article 2000 to heat a tobacco section in the aerosol generation article 2000 to generate an aerosol. Certainly, it is not excluded that in another embodiment, the hot air may flow into the interior of the aerosol generation article 2000 from a side wall of the aerosol generation article 2000.

[0100] An end of the tubular body 10a is provided with a first opening 111a, and at least part of the aerosol generation article 2000 is inserted into the containing cavity for accommodation through the first opening 111a. The end with the first opening in the tubular body is defined as a proximal end m1 of the heating device, and a distal end m2 of the heating device is arranged opposite to the proximal end m1. It may be understood that for other parts and components such as the airflow heating assembly and the proximal end m1 and the distal end m2 of the airflow channel, reference may also be made to the above definition.

[0101] For the above tubular body 10a, the containing cavity therein includes a first containing cavity 114a and a second containing cavity 115a. Along a flow direction of the air in the containing cavity, the first containing cavity 114a is located downstream of the second containing cavity 115a. With a proximal end of the tubular body 10a as a reference point, the second containing cavity 115a is provided adjacent to a distal end of the first containing cavity 114a. The first containing cavity 114a and the second containing cavity 115a are both configured to contain a portion of the aerosol generation article 2000. An inner containing diameter of the second containing cavity 115a is greater than a containing radius of the first containing cavity 114a. Since the second containing cavity 115a is located upstream of the first containing cavity 114a, the hot air flows through the aerosol generation article 2000 located in the second containing cavity 115a and then flows into the aerosol generation article 2000 located in the first containing cavity 114a, so that a temperature of a wall defining the second containing cavity 115a in the tubular body 10a is higher than a temperature of a wall defining the first containing cavity 114a in the tubular body 10a.

[0102] In an example, the tubular body is not an integrally formed tube, and the wall defining the first containing cavity and the wall defining the second containing cavity in the tubular body are connected by assembly. In an example, the wall defining the first containing cavity and the wall defining the second containing cavity in the tubular body are made of different materials.

[0103] In the embodiments shown in FIG. 21 and FIG. 22, the tubular body 10a includes a first tubular body 11a.

[0104] In an example, the first tubular body 11a contains a thermal insulation material, so that the first tubular body 11a has a thermal insulation function. The thermal insulation material means that a thermal conductivity of a material is less than 100 W / m·K, preferably less than 40 W / m·K or less than 10 W / m·K at 23° C. and a relative humidity of 50%. For example, the thermal insulation material may be made of at least one of a PAEK-based material, a PI material, or a PBI material. The PAEK-based material includes a material such as glass fiber, glass felt, ceramics, silica, alumina, PEEK, PEKK, PEKEKK, or PEK. The PAEK-based material includes a material such as PEEK, PEKK, PEKEKK, or PEK.

[0105] In an example, the first tubular body 11a includes a thermal insulation material surrounding a periphery of the first tubular body 11a.

[0106] In an example, mainly referring to FIG. 21 and FIG. 22, the tubular body 10a further includes a second tubular body 12a. The second tubular body 12a is arranged on a periphery of the first tubular body 11a, and a cavity 13a is formed between the first tubular body 11a and the second tubular body 12a. The first tubular body 11a is configured to receive and fix at least part of the aerosol generation article, and the cavity 13a is configured to reduce heat transferred from the first tubular body 11a to the second tubular body 12a. The cavity 13a may form a negative pressure thermal insulation layer or a gas thermal insulation layer, that is, an interior of the cavity 13a is in a vacuum negative pressure state or filled with a gas. In other words, an air pressure in the cavity 13a may be less than or equal to an outside atmospheric pressure, or may be less than or equal to a standard atmospheric pressure. The gas filled in the cavity 13a may be a certain gas, which may be for example pure carbon dioxide, pure nitrogen, or pure argon. The gas filled in the cavity 13a may be a mixed gas composed of a plurality of gases. The gas filled in the cavity 13a may be air. Certainly, in another embodiment, the cavity 13a may further be filled with a thermal insulation material. In this example, the first tubular body 11a may include metal.

[0107] The first tubular body 11a includes a first portion 112a and a second portion 113a. The first portion 112a defines a first containing cavity 114a, and the first portion 112a is further provided with a first opening 111a. The first opening 111a brings the first containing cavity 114a into communication with an outside environment. The second portion 113a defines a second containing cavity 115a, and the first containing cavity 114a and the second containing cavity 115a are in air communication. The aerosol generation article is inserted into the first containing cavity 114a and the second containing cavity 115a through the first opening 111a. Since the second containing cavity 115a is located upstream of the first containing cavity 114a based on the flow direction of the hot air, a temperature of the second portion 113a may be higher than a temperature of the first portion 112a. An inner diameter of the second portion 113a is greater than an inner diameter of the first portion 112a, so that a gap is defined between an outer peripheral surface of the aerosol generation article 2000 and the second portion 113a. The second portion 113a is prevented from transferring heat to the aerosol generation article 2000 through the gap, which helps increase thermal resistance between the second portion 113a and the aerosol generation article 2000, and prevents the aerosol generation article 2000 contained in the second containing cavity 115a from being carbonized or burned due to overheating. The first portion 112a may be attached to the outer peripheral surface of the aerosol generation article 2000 to clamp the aerosol generation article 2000, thereby helping to keep the aerosol generation article 2000 inside the tubular body 10a.

[0108] In addition, the gap between the aerosol generation article and the second portion 113a may be filled with the hot air entering the second containing cavity 115a, which is helpful to make the aerosol generation article 2000 located in the second containing cavity 115a heated more evenly and improve quality of the generated aerosol.

[0109] In an embodiment, the tubular body 10a or the first tubular body 11a includes a heating portion. The heating portion may be an electric heating portion. For example, the heating portion includes a resistive material. The resistive material can generate Joule heat when energized, or for example, the heating portion includes an infrared coating. The infrared coating can radiate infrared rays to the containing cavity when energized. The heating portion enables the tubular body 10a or the first tubular body 11a to generate heat, so that the tubular body 10a or the first tubular body 11a can cooperate with the airflow heating assembly 20a to jointly heat the aerosol generation article 2000 contained in the containing cavity. Under the action of hot air, a temperature of the second containing cavity 115a is higher than a temperature of the first containing cavity 114a. Therefore, to prevent the aerosol generation article 2000 located in the second containing cavity 115a from being overheated, the inner containing diameter of the second containing cavity 115a is designed to be greater than the inner containing diameter of the first containing cavity 114a, which may prevent the aerosol generation article 2000 from contacting with a cavity wall of the second containing cavity 115a and prevent local overheating of the aerosol generation article 2000.

[0110] Mainly referring to FIG. 22, along a length direction of the tubular body 10a, an extension length L4 of the second containing cavity 115a satisfies 2 mm≤L4≤3 mm. For example, the extension length L4 of the second containing cavity 115a may be 2.3 mm, 2.5 mm, 2.8 mm, or the like. A difference between an inner diameter D2 of the second portion 113a and an inner diameter D1 of the first portion 112a satisfies 0.6 mm≤D2-D1≤1 mm.

[0111] In some embodiments, mainly referring to FIG. 22 and FIG. 23, the first portion 112a and the second portion 113a have the same outer diameter. To be specific, the first tubular body 11a has different wall thicknesses at the first portion 112a and the second portion 113a. The second portion 113a having a smaller wall thickness than the first portion 112a may be formed by forming a groove on an inner wall of the first tubular body 11a.

[0112] In another embodiment, the first portion 112a and the second portion 113a have the same wall thickness, and a part of the first tubular body 11a may be formed by using a shaping process, to form a second portion 113a that arches outward relative to the first portion 112a along a radial direction of the first tubular body 11a, or form a first portion 112a that tightens inward relative to the second portion 113a along the radial direction of the first tubular body 11a. In this example, the first tubular body 11a may be made of metal, so that it is convenient to perform stamping processing on the first tubular body 11a, for example, stamping outward to form the outwardly arched second portion 113a, or stamping inward to form the inwardly tightened first portion 112a.

[0113] It should be noted that the first tubular body 11a and the second tubular body 12a may further be formed by using another suitable process such as injection molding or casting.

[0114] It should be noted that the second tubular body 12a may also be made of metal, so that a proximal end of the first tubular body 11a and a proximal end of the second tubular body 12a may be connected by welding, and a distal end of the first tubular body 11a and a distal end of the second tubular body 12a may also be connected by welding, which helps to form a sealed cavity 13a between the first tubular body 11a and the second tubular body 12a.

[0115] In some embodiments, mainly referring to FIG. 21 and FIG. 22, an inner wall surface of the tubular body 10a is further provided with a second protrusion 14a. The second protrusion 14a is located between the airflow heating assembly 20a and the second containing cavity 115a, and a proximal end of the airflow heating assembly 20a abuts against the second protrusion 14a, so as to fixedly mount the airflow heating assembly 20a inside the tubular body 10a. A minimum inner diameter of the second protrusion 14a is greater than or equal to the inner containing diameter of the first containing cavity 114a. Since the second protrusion 14a may be a continuous annular second protrusion 14a or may be bumps annularly arranged at intervals, it is only necessary that the minimum inner diameter of the second protrusion 14a is greater than or equal to the inner containing diameter of the first containing cavity 114a. When the minimum inner diameter of the second protrusion 14a is equal to the inner containing diameter of the first containing cavity 114a, the second protrusion 14a forms line contact with an outer peripheral surface of an end portion of the aerosol generation article. Compared with surface contact, the line contact design may effectively reduce heat transferred directly from the second protrusion 14a to the end portion of the aerosol generation article. When the minimum inner diameter of the second protrusion 14a is greater than the inner containing diameter of the first containing cavity 114a, the second protrusion 14a does not come into contact with the end portion of the aerosol generation article, so that the heat directly transferred from the second protrusion 14a to the end portion of the aerosol generation article may be further reduced.

[0116] For the above airflow heating assembly 20a, mainly referring to FIG. 21, the airflow heating assembly 20a includes a third thermal insulation member 21a and an airflow heating member 22a. The third thermal insulation member 21a is arranged at a proximal end of the airflow heating member 22a, and a proximal end of the third thermal insulation member 21a abuts against the second protrusion 14a. The airflow heating member 22a is configured to heat air in the airflow channel 30a to form hot air, and the third thermal insulation member 21a is configured to reduce heat directly transferred from the airflow heating member 22a to the tubular body 10a.

[0117] In some embodiments, mainly referring to FIG. 24, to better support the end portion of the aerosol generation article so that the end portion of the aerosol generation article is located in the second containing cavity 115a, the proximal end of the third thermal insulation member 21a is further provided with a support portion 211a. One or more support portions 211a may be arranged. A plurality of support portions 211a are arranged at intervals, so that hot air can flow to the end portion of the aerosol generation article through a gap between the support portions 211a for heating. It may be understood that the third thermal insulation member 21a may be made of a thermal insulation material. For example, the third thermal insulation member 21a may be made of ceramics.

[0118] The heating device 100a of this application includes a tubular body 10a, an airflow channel 30a, and an airflow heating assembly 20a. A proximal end of the tubular body 10a is provided with a first opening 111a for allowing insertion of the aerosol generation article 2000 therein. A first containing cavity 114a and a second containing cavity 115a for containing part of the aerosol generation article 2000 are successively defined in the tubular body 10a from near to far. An inner containing diameter of the second containing cavity 115a is greater than an inner containing diameter of the first containing cavity 114a. The airflow channel 30a is configured to allow air to enter the second containing cavity 115a, and the airflow heating assembly 20a is configured to heat the air in the airflow channel 30a. Through structure arrangement with the inner containing diameter of the second containing cavity 115a being greater than the inner containing diameter of the first containing cavity 114a, the end portion of the aerosol generation article 2000 inserted into the second containing cavity 115a may be caused not to directly contact the tubular body 10a, and the end portion of the aerosol generation article 2000 is directly heated through hot air, so that an effect of more uniform heating is achieved, to avoid a situation that the end portion of the aerosol generation article 2000 generates smoke as a result of burning due to local overheating, thereby effectively improving the quality of the generated aerosol.

[0119] This application further provides an embodiment of an aerosol generating device. The aerosol generating device includes the above heating device 100a, and further includes a power supply assembly. For a specific structure and functions of the heating device 100a, reference may be made to the above embodiments, and details are not described herein again. The power supply assembly may include any power supply that can provide electric energy for heat generation of the heating device 100a. The power supply may be any suitable battery. The power supply assembly may further include a control panel. The power supply may be electrically connected to the heating device 100a through the control panel. The control panel may control an operation of the aerosol generating device, including but not limited to controlling a heating power, a heating current, a heating voltage, or the like of the heating device 100a.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit this application. Under the idea of this application, the technical features of the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and many other variations of different aspects of this application as described above exist, which are not provided in detail for the sake of simplicity. Although this application has been described in detail with reference to the foregoing embodiments, it should be understood by a person skilled in the art that modifications may still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made to some of the technical features. However, these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of various embodiments of this application.

Examples

embodiment i

[0039]Referring to FIG. 1, a heating device 100 includes a heat preservation assembly 10 and an airflow heating assembly 20. An interior of the heat preservation assembly 10 is provided with a receiving cavity 11 in communication with an outside environment. The airflow heating assembly 20 is arranged at one end of the receiving cavity 11, and an other end of the receiving cavity 11 is configured to accommodate an aerosol generation article 2000. When the aerosol generation article 2000 is placed in the receiving cavity 11, an air inlet end of the aerosol generation article 2000 is close to the airflow heating assembly 20, and an inner surface of the heat preservation assembly 10 is substantially attached to a circumferential outer surface of the aerosol generation article 2000. The substantial attachment means that a distance L1 between the inner surface of the heat preservation assembly 10 and the circumferential outer surface of the aerosol generation article 2000 placed in the r...

embodiment ii

[0096]Mainly referring to FIG. 21, a heating device 100a includes a tubular body 10a, an airflow channel 30a, and an airflow heating assembly 20a. The tubular body 10a has a containing cavity inside. The containing cavity is configured to receive at least part of an aerosol generation article 2000. The airflow channel 30a is in fluid communication with the containing cavity, and air enters the containing cavity through the airflow channel.

[0097]In an example, as shown in FIG. 21, the air enters the containing cavity from a distal end of the containing cavity. It may be understood that in another example, the air may further enter the containing cavity from a middle region of the containing cavity.

[0098]In an example, at least part of the airflow channel 30a is located inside the tubular body 10a, and the airflow heating assembly 20a is arranged in the airflow channel 30a. The air flowing through the airflow channel 30a flows through the airflow heating assembly 20a, so that the airf...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a National Stage Entry under 35 U.S.C. § 371 of PCT International Application No. PCT / CN2023 / 106156 filed on Jul. 6, 2023, which claims priority to Chinese Patent Application No. 202210800951.1, filed with the China National Intellectual Property Administration on Jul. 8, 2022 and entitled “HEATING DEVICE, AEROSOL GENERATING DEVICE, AND AEROSOL GENERATING SYSTEM”, and claims priority to Chinese Patent Application No. 202320733081.0, filed with the China National Intellectual Property Administration on Mar. 24, 2023 and entitled “HEATING MECHANISM AND AEROSOL GENERATING DEVICE”, the entire contents of each of which are incorporated herein by reference for all purposes.TECHNICAL FIELD

[0002] Embodiments of this application relate to the technical field of aerosol generating devices, and in particular, to a heating device, an aerosol generating device, and an aerosol generating system.BACKGROUND

[0003] With the development and promotion of heat-not-burn technology, aerosol generating devices are increasingly more widely applied. The most important component in the aerosol generating device is a heating device, and an aerosol generation article is heated through the heating device, so that the aerosol generation article can generate smoke. In an existing product, a heating assembly is generally arranged at an air inlet end of the aerosol generation article for heating.

[0004] In the process of implementing embodiments of this application, the inventor found that such a design manner of arranging the heating assembly only at the air inlet end of the aerosol generation article may lead to a problem of uneven circumferential heating of the aerosol generation article.SUMMARY

[0005] Embodiments of this application are intended to provide a heating device, an aerosol generating device, and an aerosol generating system. A heat preservation assembly is attached to an aerosol generation article, so that heat of the heat preservation assembly heated by a heating assembly can be transferred to a circumferential outer surface of the aerosol generation article, so that the heat of the heat preservation assembly is effectively used, and parts and components of the heating device are reduced.

[0006] To resolve the above technical problem, a technical solution adopted by the embodiments of this application is to provide a heating device for heating an aerosol generation article, including a heat preservation assembly and an airflow heating assembly. The heat preservation assembly includes an inner tube portion and an outer tube portion. The inner tube portion is internally provided with a receiving cavity. The outer tube portion is arranged around the inner tube portion. The outer tube portion and the inner tube portion jointly define a cavity. An interior of the cavity is vacuum or filled with a medium with low thermal conductivity. The receiving cavity is configured to accommodate the aerosol generation article. The airflow heating assembly is arranged in the receiving cavity. The airflow heating assembly is configured to heat a gas flowing through the airflow heating assembly, so that the heated gas heats the aerosol generation article placed in the receiving cavity.

[0007] To resolve the above technical problem, another technical solution adopted by the embodiments of this application is to provide an aerosol generating device, including a housing, a circuit device, a sheath, and the heating device as described above. The housing is provided with a receiving space and a first socket. The first socket is communication with the receiving cavity. The receiving space is configured to accommodate the circuit device, the sheath, and the heating device. The sheath is sleeved outside the heating device. The sheath is configured to accommodate and support the heating device. The first socket is configured to allow insertion or removal of an external aerosol generation article into or from the sheath and the heating device. The circuit device is electrically connected to the heating device. The circuit device is configured to provide electric energy for the heating device.

[0008] To resolve the above technical problem, still another technical solution adopted by the embodiments of this application is to provide an aerosol generating system, including an aerosol generation article and the aerosol generating device as described above. The aerosol generating device is configured to allow insertion of the aerosol generation article. The aerosol generating device is configured to heat the aerosol generation article inserted into the receiving cavity. The aerosol generation article includes at least a tobacco section, a cooling section, and a mouthpiece section. The tobacco section, the cooling section, and the mouthpiece section are connected in sequence. When the aerosol generation article is inserted into the receiving cavity, an axial length of the tobacco section is equal to or slightly greater than a length of the tobacco section inserted into the receiving cavity.

[0009] The heating device in the embodiments of this application includes a heat preservation assembly and an airflow heating assembly. The heat preservation assembly is internally provided with a receiving cavity. The receiving cavity is configured to accommodate an aerosol generation article. The airflow heating assembly is arranged in the receiving cavity. The airflow heating assembly is configured to heat a gas flowing through the airflow heating assembly, so that the heated gas can heat the aerosol generation article placed in the receiving cavity. When the aerosol generation article is placed in the receiving cavity, an inner surface of the heat preservation assembly is substantially attached to a circumferential outer surface of the aerosol generation article, and heat of an inner wall surface of the heat preservation assembly can be transferred to the circumferential outer surface of the aerosol generation article for auxiliary heating, so that the heat of the heat preservation assembly is effectively used, and parts and components of the heating device are reduced.BRIEF DESCRIPTION OF THE DRAWINGS

[0010] One or more embodiments are exemplarily described with reference to the accompanying drawings corresponding to the embodiments, and the exemplary descriptions do not constitute a limitation on the embodiments. Elements in the accompanying drawings that have a same reference numeral are represented as similar elements, and unless otherwise particularly stated, the figures in the accompanying drawings are not drawn to scale.

[0011] FIG. 1 is a cross-sectional view of a viewing angle of a heating device according to an embodiment of this application.

[0012] FIG. 2 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to an embodiment of this application.

[0013] FIG. 3 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to another embodiment of this application.

[0014] FIG. 4 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to yet another embodiment of this application.

[0015] FIG. 5 is a cross-sectional view of a viewing angle of a heat preservation assembly of a heating device according to still another embodiment of this application.

[0016] FIG. 6 is an exploded view of a viewing angle of a heating device according to an embodiment of this application.

[0017] FIG. 7 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a heating member.

[0018] FIG. 8 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a metal heating mesh.

[0019] FIG. 9 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a flexible printed circuit (FPC) heating film.

[0020] FIG. 10 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a resistive heating element.

[0021] FIG. 11 is an exploded view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is an induction coil.

[0022] FIG. 12 is a cross-sectional view of another viewing angle of a heating device according to an embodiment of this application.

[0023] FIG. 13 is a cross-sectional view of a viewing angle from which a heating element in a heating device according to an embodiment of this application is a heating circuit coating.

[0024] FIG. 14 is a cross-sectional view of a viewing angle of an aerosol generating system according to an embodiment of this application.

[0025] FIG. 15 is a cross-sectional view of a viewing angle of a housing and a sheath of an aerosol generating device according to an embodiment of this application.

[0026] FIG. 16 is an exploded view of a viewing angle of a sheath of an aerosol generating device according to an embodiment of this application.

[0027] FIG. 17 is an enlarged view of a portion A in FIG. 12.

[0028] FIG. 18 is a schematic diagram of a viewing angle of an end cap of an aerosol generating device according to an embodiment of this application.

[0029] FIG. 19 is a schematic diagram of a viewing angle of a second thermal insulation member of an aerosol generating device according to an embodiment of this application.

[0030] FIG. 20 is an enlarged view of a portion B in FIG. 12.

[0031] FIG. 21 is a cross-sectional view of a heating device according to Embodiment II of this application.

[0032] FIG. 22 is a cross-sectional view of a heat preservation assembly in a heating device according to Embodiment II of this application.

[0033] FIG. 23 is a cross-sectional view of a heat preservation assembly in another heating device according to Embodiment II of this application.

[0034] FIG. 24 is a cross-sectional view of another heating device according to Embodiment II of this application.DETAILED DESCRIPTION

[0035] For ease of understanding of this application, this application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described to be “fixed to” / “fixedly connected to” / “mounted to” another element, the element may be directly fixed to the another element, or one or more intermediate elements may exist therebetween. When one element is described to be “connected to” another element, the element may be directly connected to the another element, or one or more intermediate elements may exist therebetween. Terms “vertical”, “horizontal”, “left”, “right”, “inner”, “outside”, and similar expressions used in this specification are for illustrative purposes only.

[0036] Unless otherwise defined, meanings of all technical and scientific terms used in this specification are the same as that usually understood by a person skilled in the technical field to which this application belongs. Terms used in the specification of this application are merely intended to describe objectives of the specific embodiments, but are not intended to limit this application. A term “and / or” used in this specification includes any or all combinations of one or more related listed items.

[0037] In addition, the technical features involved in the different embodiments of this application described below may be combined with each other so long as they do not constitute a conflict with each other.

[0038] In this specification, the “mounting” includes fixing or limiting an element or a device to a specific position or place in a manner such as welding, screwing, snapping, or bonding. The element or the device may keep still at the specific position or place or move within a limited range. The element or the device may or may not be disassembled after being fixed or limited to the specific position or place, which is not limited in the embodiments of this application.Embodiment I

[0039] Referring to FIG. 1, a heating device 100 includes a heat preservation assembly 10 and an airflow heating assembly 20. An interior of the heat preservation assembly 10 is provided with a receiving cavity 11 in communication with an outside environment. The airflow heating assembly 20 is arranged at one end of the receiving cavity 11, and an other end of the receiving cavity 11 is configured to accommodate an aerosol generation article 2000. When the aerosol generation article 2000 is placed in the receiving cavity 11, an air inlet end of the aerosol generation article 2000 is close to the airflow heating assembly 20, and an inner surface of the heat preservation assembly 10 is substantially attached to a circumferential outer surface of the aerosol generation article 2000. The substantial attachment means that a distance L1 between the inner surface of the heat preservation assembly 10 and the circumferential outer surface of the aerosol generation article 2000 placed in the receiving cavity 11 is in a range of 0 mm≤L1≤2 mm. In some embodiments, the distance L1 satisfies 0.2 mm≤L1≤0.7 mm. In some embodiments, the distance L1 is 0.5 mm. The airflow heating assembly 20 is configured to heat a gas flowing through the airflow heating assembly 20, so that the heated gas heats the aerosol generation article 2000 placed in the receiving cavity 11. In addition, heat of the inner surface of the heat preservation assembly 10 heated by the airflow heating assembly 20 can be directly or indirectly transferred to an outer surface of the aerosol generation article 2000, so as to perform auxiliary heating on the aerosol generation article 2000 and make full use of the heat of the heat preservation assembly 10.

[0040] In some embodiments, still referring to FIG. 1, the heating device 100 further includes a temperature measurement element 30. The temperature measurement element 30 is arranged inside the airflow heating assembly 20. The temperature measurement element 30 is configured to measure a temperature of the airflow heating assembly 20, so as to facilitate real-time monitoring and control of the temperature of the airflow heating assembly 20.

[0041] For the heat preservation assembly 10 described above, referring to FIG. 2, the heat preservation assembly 10 includes an inner tube portion 12 and an outer tube portion 13. The inner tube portion 12 is provided with a receiving cavity 11. The outer tube portion 13 is arranged around the inner tube portion 12. A closed cavity 14 is jointly defined by the outer tube portion 13 and the inner tube portion 12. An interior of the closed cavity 14 is in a vacuum state, or filled with an inert gas with low thermal conductivity, so that a temperature of the outer tube portion 13 of the heat preservation assembly 10 is lower than a temperature of the inner tube portion 12, so as to play a role in thermal insulation. It is worth noting that when the interior of the closed cavity 14 is in the vacuum state, it does not mean that the interior of the closed cavity 14 is completely vacuum, but it should be understood that an air pressure in the closed cavity 14 is lower than the standard atmospheric pressure. To be specific, the closed cavity 14 is in a negative pressure state, and a degree of gas rarefaction in the closed cavity 14 is measured by a vacuum degree.

[0042] It may be understood that in some embodiments, referring to FIG. 3, a cavity 14 communicating with an outside environment is formed jointly by the outer tube portion 13 and the inner tube portion 12. The cavity 14 is filled with a medium with low thermal conductivity, for example, thermal insulation materials such as glass fiber, asbestos, rock wool, and silicate.

[0043] In some embodiments, referring to FIG. 4, the heat preservation assembly 10 may further include an abutting member 15. The abutting member 15 is arranged on an inner surface of the inner tube portion 12, and the abutting member 15 is located between a first chamber 111 and a second chamber 112. The abutting member 15 is configured to connect to the airflow heating assembly 20 to fix the airflow heating assembly 20 in the first chamber 111. In addition, the abutting member 15 further has a limiting effect on the airflow heating assembly 20 to prevent the airflow heating assembly 20 from entering the second chamber 112 beyond the first chamber 111 during mounting. In some embodiments, the abutting member 15 may be a convex rib, an engagement tooth, or the like.

[0044] In some embodiments, when the heating device 100 is in a normal operating state, the heat preservation assembly 10 meets at least one of the following conditions: the temperature of the inner tube portion 12 is in a range of 100° C. to 150° C., and the temperature of the outer tube portion 13 is in a range of 40° C. to 80° C.

[0045] In some embodiments, when the aerosol generation article 2000 is placed in the receiving cavity 11 and the heating device 100 is in normal operation, the inner tube portion 12 meets at least one of the following conditions: the temperature of an end of the inner tube portion 12 close to the aerosol generation article 2000 is in a range of 100° C. to 120° C., and the temperature of an end of the inner tube portion 12 close to the airflow heating assembly 20 is in a range of 120° C. to 150° C.

[0046] For the above receiving cavity 11, still referring to FIG. 2, the receiving cavity 11 is provided with a first chamber 111 and a second chamber 112, and the first chamber 111 and the second chamber 112 are in communication with each other along a first direction X. The first direction X is parallel to a center line of the heat preservation assembly 10. The first chamber 111 is configured to allow mounting of the airflow heating assembly 20, and the second chamber 112 is configured to allow mounting of the aerosol generation article 2000. When the aerosol generation article 2000 is mounted in the second chamber 112, and a user sucks an air outlet end of the aerosol generation article 2000 (the air inlet end and the air outlet end are respectively arranged on two ends of the aerosol generation article 2000), a negative pressure is generated inside the aerosol, and an external gas flows through the airflow heating assembly 20 and is heated by the airflow heating assembly 20, and then enters the aerosol generation article 2000 from the air inlet end to complete heating of the aerosol generation article 2000.

[0047] In some embodiments, still referring to FIG. 2, a cross-sectional area of the first chamber 111 is greater than a cross-sectional area of the second chamber 112, so that the receiving cavity 11 is in a shape of a step, which may be beneficial to ensure that an inner wall surface of the second chamber 112 is substantially attached to the circumferential outer surface of the aerosol generation article 2000 when an outer contour of the airflow heating assembly 20 along the first direction X is larger than an outer contour of the aerosol generation article 2000 along the first direction X. In addition, it is convenient for the airflow heating assembly 20 to be mounted in the first chamber 111. A cross section of the first chamber 111 and a cross section of the second chamber 112 are both perpendicular to the first direction X. It may be understood that in some embodiments, an inner diameter of the receiving cavity 11 along the first direction X may also be the same.

[0048] In the embodiment of this application, the receiving cavity 11 extends through the inner tube portion 12 along the first direction X, that is, openings at both ends of the receiving cavity 11 in communication with the outside environment are respectively located at both ends of the heat preservation assembly 10. It may be understood that in some other embodiments, referring to FIG. 4, an arrow represents an airflow direction. The heat preservation assembly 10 further includes a peripheral plate 16. The peripheral plate 16 is arranged on an outer side of the outer tube portion 13, so that the openings of the receiving cavity 11 in communication with the outside environment may be both located at the same end of the heat preservation assembly 10. An air inlet channel is formed between the peripheral plate 16 and the outer tube portion 13. A gas absorbs heat from the outer tube portion 13 while flowing through the air inlet channel, so that the gas is preheated before entering the air guide channel 211.

[0049] For the above airflow heating assembly 20, referring to FIG. 6, the airflow heating assembly 20 includes an air guide element 21 and a heating element 22. The air guide element 21 is configured to allow gas flow, and the heating element 22 is configured to heat the air guide element 21, or the air guide element 21 spontaneously generates heat under the action of the heating element 22, thereby heating the gas flowing through the air guide element 21.

[0050] In the embodiment of this application, the air guide element 21 is made of graphite, and the air guide element 21 has good thermal conductivity, which is beneficial to improve heating efficiency. In some embodiments, the air guide element 21 is made of a graphite alloy. The graphite alloy has good magnetic conductivity and relatively high thermal conductivity. The good magnetic conductivity causes the heating element 22 to adopt an electromagnetic heating mode in addition to a resistive heating mode, so that the air guide element 21 can also generate heat, which increases an optional heating solution. The relatively high thermal conductivity can effectively reduce time required for the heating element 22 to heat the air guide element 21 to a predetermined temperature, so as to improve heating efficiency of the airflow heating assembly 20.

[0051] Referring to FIG. 7, the air guide element 21 is provided with a second mounting groove 212 and at least one air guide channel 211 extending through the air guide element, and the air guide channel 211 enables an external gas to flow from one end of the air guide element 21 to an other end of the air guide element 21. In the embodiment of this application, the air guide channel 211 extends through the air guide element 21 along the first direction X, and a plurality of air guide channels 211 are provided. In some other embodiments, a shape of the air guide channel 211 may be an irregular shape. For example, the air guide channel 211 may be inclined, spiral, or winding in shape inside the air guide element 21, as long as the external gas flows through the air guide channel 211 from one end of the air guide element 21 to the other end of the air guide element 21. The second mounting groove 212 is located in the center of a cross section of the air guide element 21. The second mounting groove 212 is configured to allow mounting of the temperature measurement element 30. The cross section of the air guide element 21 is perpendicular to the first direction X. The second mounting groove 212 is arranged in a central position of the cross section of the air guide element 21, so that temperature data measured by the temperature measurement element 30 may be closer to a temperature at which air is heated, thereby improving accuracy of temperature control of the airflow heating assembly 20. Certainly, in some embodiments, the second mounting groove 212 is an air guide channel 211 located in the center of the cross section of the air guide element 21, and the temperature measurement element 30 is arranged in the air guide channel 211.

[0052] The plurality of air guide channels 211 are in a shape of a cylinder, and a diameter D1 of each of the air guide channels 211 satisfies 0<D1≤0.5 mm. By adopting a scheme of small-diameter air guide channels 211, on the one hand, the number of air guide channels 211 may be increased, and on the other hand, the heating efficiency of the gas flowing through the air guide channels 211 may be improved, to prevent a gas flow from being large and a poor gas heating effect as a result of an excessively large diameter of the air guide channel 211.

[0053] A ratio of a sum of the areas of the cross sections of the plurality of air guide channels 211 to the area of the cross section of the air guide element 21 is greater than or equal to 1 / 5. The cross section of the air guide channel 211 is within the cross section of the air guide element 21, and the cross sections of the air guide channel 211 and the air guide element 21 are both perpendicular to the center line of the air guide element 21. On the premise of satisfying structural stability of the air guide element 21, when the ratio of the area of the cross section of the air guide channel 211 to the area of the cross section of the air guide element 21 is closer to 1, it indicates a larger effective area of the air guide channel 211 and a larger available gas flow area. When the area of the cross section of a single air guide channel 211 is fixed, a larger quantity of air guide channels 211 may be provided on the air guide element 21.

[0054] A plurality of air guide channels 211 are arranged around the center of the air guide element 21, and a ratio of a quantity of air guide channels 211 located in an inner rim to a quantity of air guide channels 211 located in an outer rim is equal to a ratio of a radius of the inner rim to a radius of the outer rim. Along a direction that the center of the cross section of the air guide element 21 points to an edge of the cross section of the air guide element 21, a growing quantity of air guide channels 211 that may be provided leads to an increase in flow channels of gas. In some embodiments, the plurality of air guide channels 211 are arranged in a circumferential array, that is, a distance between two adjacent air guide channels 211 located in the same rim is equal.

[0055] The air guide element 21 satisfies at least one of the following conditions: (1) a diameter D3 of the air guide element 21 is in a range of 4 mm≤D3≤8 mm; (2) the diameter D3 of the air guide element 21 is in a range of 6 mm≤D3≤7 mm; (3) a cross-sectional area S1 of the air guide element 21 is in a range of 10 mm≤S1≤50 mm2; (4) the cross-sectional area S1 of the air guide element 21 is in a range of 25 mm≤S1≤35 mm2; (5) an axial length L1 of the air guide element 21 is in a range of 5 mm≤L1≤10 mm; and (6) the axial length L1 of the air guide element 21 is in a range of 7 mm≤L1≤9 mm.

[0056] In the embodiment of this application, the cross-sectional area of the air guide element 21 is the same as the cross-sectional area of the second chamber 112, so that the air guide element 21 covers the air inlet end of the aerosol generation article 2000 accommodated in the second chamber 112 as much as possible, to ensure that the air heated by the air guide element 21 has a larger heating area for the aerosol generation article 2000. Since the cross-sectional area of the first chamber 111 is greater than the cross-sectional area of the second chamber 112, the heating element 22 may be arranged on a circumferential outer side of the air guide element 21. Certainly, in some embodiments, the heating element 22 may be mounted by reducing part of the outer diameter of the air guide element 21, so that a gap is defined between the air guide element 21 and the heat preservation assembly 10, causing the cross-sectional area of the first chamber 111 to be consistent with the cross-sectional area of the second chamber 112, which is convenient for processing and manufacturing of the heat preservation assembly 10.

[0057] In some embodiments, still referring to FIG. 7, the air guide element 21 includes a first air guide block 213 and a second air guide block 214. The first air guide block 213 is provided with a first groove 2131, and the second air guide block 214 is provided with a second groove 2141. When the first air guide block 213 and the second air guide block 214 are spliced, the first groove 2131 and the second groove 2141 jointly define the above second mounting groove 212. The air guide element 21 adopts a split design, which may help the temperature measurement element 30 to be mounted in the second mounting groove 212 more easily, and improve assembly efficiency of the heating device 100.

[0058] In some embodiments, still referring to FIG. 7, the air guide element 21 is provided with a first mounting groove 215. The first mounting groove 215 is configured to allow mounting of the heating element 22. At least one first mounting groove 215 is provided. When one first mounting groove 215 is provided, the first mounting groove 215 is provided in the center of the air guide element 21. The heating element 22 is arranged in the center of the air guide element 21, so that a characteristic that the heating element 22 transfers heat in bursts may be fully utilized, and heat loss of the heating element 22 may be reduced. When a quantity of first mounting grooves 215 is two or more, two or more first mounting grooves 215 are arranged around the center of the air guide element 21. To be specific, the first mounting grooves 215 are located between the center of the air guide element 21 and the edge of the air guide element 21, and the heating element 22 may be mounted in each of the first mounting grooves 215. The first mounting groove 215 is provided between the center and the edge of the air guide element 21, so that the heating element 22 can quickly heat the air guide element 21, and a degree of heating between the center and the edge of the air guide element 21 is relatively uniform. Certainly, the first mounting groove 215 may be provided as a through groove or a blind groove based on an actual situation.

[0059] A diameter D2 of the first mounting groove 215 satisfies the following requirements: 0 mm<D2≤1.7 mm. On the premise that the heating member 20 can be mounted in the first mounting groove 215, a smaller diameter of the first mounting groove 215 leads to a more favorable increase in the quantity of air guide channels 211.

[0060] In some embodiments, still referring to FIG. 7, a circumferential outer surface of the air guide element 21 is provided with a first mounting region 216 and a second mounting region 217. The first mounting region 216 is configured to connect to the inner surface of the inner tube portion 12 of the heat preservation assembly 10 through interference fit, and the air guide element 21 is fixed to the inner tube portion 12 under the action of friction. In some embodiments, the first mounting region 216 is provided with a first protrusion 2161. The first protrusion 2161 abuts against the inner surface of the inner tube portion 12 of the heat preservation assembly 10 to form line contact or point contact. Certainly, in some other embodiments, the first mounting region 216 may be connected to the inner tube portion 12 in another connection manner, such as bonding.

[0061] The second mounting region 217 does not abut against the inner surface of the inner tube portion 12 of the heat preservation assembly 10. A gap is formed between the second mounting region 217 and the inner tube portion 12, which may reduce a contact area between the air guide element 21 and the inner tube portion 12, and prevent the heat of the air guide element 21 from being transferred to the inner tube portion 12 of the heat preservation assembly 10 excessively fast. In some embodiments, the second mounting region 217 may be configured to allow mounting of the heating element 22, and the heating element 22 is sleeved on an outer surface of the second mounting region 217 to heat the air guide element 21 from outside to inside. The heating element 22 is arranged in the second mounting region 217, so that a structural layout among the heating element 22, the air guide element 21, and the heat preservation assembly 10 can be more compact on the premise that the heating element 22 meets a heating function.

[0062] For the above heating element 22, in some embodiments, referring to FIG. 8 and FIG. 9, the heating element 22 includes a metal heating mesh 221 or a flexible printed circuit (FPC) heating film 222. The metal heating mesh 221 or the FPC heating film 222 is at least partially arranged around an outer peripheral surface of the air guide element 21, and both the metal heating mesh 221 and the FPC heating film 222 are electrically connected to an external power supply. When the external power supply supplies power to the metal heating mesh 221 or the FPC heating film 222, the metal heating mesh 221 or the FPC heating film 222 can generate heat, thereby heating the air guide element 21. Surfaces of the metal heating mesh 221 and the FPC heating film 222 are both subjected to oxidation treatment or electrical insulation treatment, so that the metal heating mesh 221 or the FPC heating film 222 only conducts heat to the outside but does not conduct electricity.

[0063] In some embodiments, referring to FIG. 10, the heating element 22 includes a resistive heating element 223, a first insulating layer 224, and a second insulating layer 225. The resistive heating element 223 is at least partially arranged on the outer peripheral surface of the air guide element 21, the first insulating layer 224 is arranged between the air guide element 21 and the resistive heating element 223, and the second insulating layer 225 is arranged between the resistive heating element 223 and the inner surface of the inner tube portion 12 of the heat preservation assembly 10. The resistive heating element 223 is electrically connected to the external power supply. When the external power supply supplies power to the resistive heating element 223, the resistive heating element 223 can generate heat, thereby heating the air guide element 21. The first insulating layer 224 and the second insulating layer 225 are both configured to electrically insulate the resistive heating element 223, so as to prevent a situation of electric leakage as a result of the electric energy from the external power supply being conducted to the air guide element 21 or the heat preservation assembly 10, thereby improving safety of the heating device 100.

[0064] In some embodiments, the first insulating layer 224 and the second insulating layer 225 are also adhesive to fix the resistive heating element 223 and the air guide element 21 in the first chamber 111 of the receiving cavity 11. Specifically, the first insulating layer 224 fixes the air guide element 21 to the resistive heating element 223, and the second insulating layer 225 fixes the resistive heating element 223 to the inner tube portion 12 of the heat preservation assembly 10.

[0065] In some embodiments, referring to FIG. 11, the heating element 22 includes an induction coil 226. The induction coil 226 is sleeved on a circumferential outer surface of the air guide element 21, and the induction coil 226 is electrically connected to an external power supply. When the external power supply supplies power to the induction coil 226, the induction coil 226 generates an alternating magnetic field. When the air guide element 21 with good magnetic conductivity is located in the alternating magnetic field, the air guide element can generate heat, thereby heating air flowing through the air guide element 21.

[0066] In some embodiments, still referring to FIG. 11, the heating element 22 further includes a bracket 227. The bracket 227 is in a shape of a cylinder. The induction coil 226 is wound around the bracket 227. The bracket 227 is sleeved on an outer side of the air guide element 21. The bracket 227 is configured to support the induction coil 226 to prevent the induction coil 226 from being deformed.

[0067] In some embodiments, still referring to FIG. 11, the heating element 22 further includes a magnetic field shielding layer 228. The magnetic field shielding layer 228 is arranged between the induction coil 226 and the inner tube portion 12 of the heat preservation assembly 10. The magnetic field shielding layer 228 is configured to shield influence of the alternating magnetic field generated by the energized induction coil 226 on the inner tube portion 12, to reduce heat generated in the inner tube portion 12.

[0068] In some embodiments, referring to FIG. 7, the heating element 22 includes a heating member 229. The heating member 229 is arranged in the first mounting groove 215. The heating member 229 is a columnar body of resistive heating type. The heating member 229 is electrically connected to an external power supply. When the heating member 229 is arranged in the first mounting groove 215, the heating member 229 transfers heat outward in bursts. Compared with the heating mode from outside to inside, the heating member 229 has less energy consumption loss and a high heat utilization rate.

[0069] In some embodiments, the heating member 229 is spirally formed by a resistive heating wire, or the heating member 229 is cylindrical with a vent air gap, and a hollow state of the heating member 229 may facilitate flow of the gas in the first mounting groove 215 and increase the contact area between the air and the air guide element 21.

[0070] The heating member 229 satisfies at least one of the following conditions: (1) a diameter D4 of the heating member 229 satisfies 1 mm≤D4≤2 mm; (2) the diameter D4 of the heating member 229 satisfies 1.4 mm≤D4≤1.7 mm; (3) an area S2 defined by an outer contour of a cross section of the heating member 229 is in a range of 0.7 mm≤S2≤3.5 mm2, where the cross section of the air guide element 21 is perpendicular to the center line of the air guide element 21; and (4) an axial length L2 of the heating member 229 is in a range of 4 mm≤L2≤9 mm.

[0071] It is worth noting that in some embodiments, when the first mounting groove 215 provided with the heating member 229 and the second mounting groove 212 provided with the temperature measurement element 30 are both located in the center of the air guide element 21, the first mounting groove 215 and the second mounting groove 212 are the same mounting groove. The heating member 229 and the temperature measurement element 30 are both located in the mounting groove. In this case, the temperature measurement element 30 performs temperature measurement by using a temperature coefficient of resistance (TCR). Certainly, in some other embodiments, the temperature measurement element 30 may further perform temperature measurement by using a negative temperature coefficient (NTC), a thermistor, and a thermocouple.

[0072] In some embodiments, referring to FIG. 12 and FIG. 13, the heating element 22 is a heating circuit coating 230. The heating circuit coating 230 is applied onto an inner wall surface of the inner tube portion 12, and the heating circuit coating 230 is electrically connected to an external power supply through a wire. When the air guide element 21 is mounted to the first chamber 111, the outer peripheral surface of the air guide element 21 at least partially abuts against the heating circuit coating 230. The heating circuit coating 230 is configured to heat the air guide element 21. The heating circuit coating 230 has characteristics of a thin coating and high heating efficiency, which may reduce a volume of the airflow heating assembly 20. In addition, the heating circuit coating 230 is directly applied onto the inner surface of the inner tube portion 12 and integrated with the heat preservation assembly 10, so that a quantity of parts may be reduced, and the mounting is more convenient.

[0073] It is worth noting that, in order to save power consumption of the heating element 22, in the embodiment of this application, only the above heating circuit coating 230 is applied onto the inner wall surface of the first chamber 111, and the above heating circuit coating 230 is not applied onto the inner wall surface of the second chamber 112. Due to the high thermal conductivity of the air guide element 21, the heating circuit coating 230 applied onto the inner wall surface of the first chamber 111 may lead to a relatively high thermal conductivity, less heat loss, and short heating time. However, if the heating circuit coating 230 is arranged on the inner wall surface of the second chamber 112, the thermal conductivity of the circumferential outer surface of the aerosol generation article is relatively low, and the heat loss of the heating element 22 is relatively high, which helps to heat the aerosol generation article, but increases the power consumption of the heating element 22.

[0074] In some embodiments, referring to FIG. 7, the airflow heating assembly 20 further includes a first thermal insulation member 23. The first thermal insulation member 23 is arranged in the first mounting region 216. When the air guide element 21 with the first thermal insulation member 23 sleeved thereon is mounted to the inner tube portion 12 of the heat preservation assembly 10, an inner side and an outer side of the first thermal insulation member 23 respectively abut against an inner surface of the air guide element 21 and the inner surface of the inner tube portion 12. The air guide element 21 is fixed to the inner tube portion 12 under the action of friction between the first thermal insulation member 23 and the inner tube portion 12.

[0075] In the embodiment of this application, the first thermal insulation member 23 is made of ZrO2 (zirconium dioxide) and a compound thereof, and the first thermal insulation member 23 has at least characteristics of high temperature resistance, low thermal conductivity, and corrosion resistance. In some other embodiments, the first thermal insulation member 23 may also be made of a thermal insulation material such as metal and / or non-metal and a compound thereof.

[0076] When only the first mounting region 216 is provided with the first protrusion 2161, the first mounting region 216 of the air guide element 21 abuts against the inner surface of the first thermal insulation member 23 to form line contact or point contact, thereby reducing the contact area. In this case, heat transferred directly from the air guide element 21 to the first thermal insulation member 23 is less than heat transferred when the first mounting region 216 directly contacts the inner surface of the first thermal insulation member 23, which may effectively reduce the heat loss of the air guide element 21 and improve thermal efficiency.

[0077] In some embodiments, an outer surface of the first thermal insulation member 23 may also be provided with a first protrusion 2161, so that when the outer surface of the first thermal insulation member 23 abuts against the inner surface of the inner tube portion 12, the line contact or the point contact is formed, thereby reducing the contact area. Compared with the solution of only providing the first protrusion 2161 in the first mounting region 216, the solution of providing the first protrusion 2161 on the outer surface of the first thermal insulation member 23 further reduces the heat loss of the air guide element 21. Certainly, the solution of only providing the first protrusion 2161 on the outer surface of the first thermal insulation member 23 is also within the protection scope of this application. In some embodiments, the first protrusion 2161 may be directly arranged on the inner surface and the outer surface of the first thermal insulation member 23 to facilitate manufacturing of the first thermal insulation member 23.

[0078] In the embodiment of this application, the first thermal insulation member 23 includes a first split member 231 and a second split member 232. The first split member 231 covers part of the first mounting region 216, and the second split member 232 covers part of the first mounting region 216. The first split member 231 and the second split member 232 are spliced to form a cavity for allowing mounting of the air guide element 21. Certainly, the first split member 231 and the second split member 232 may not completely cover the first mounting region 216 after being spliced, and may partially cover the first mounting region 216. A main purpose of arranging the first split member 231 and the second split member 232 is to facilitate the mounting and removal of the first thermal insulation member 23 and the air guide element 21. It is worth noting that in some other embodiments, the first thermal insulation member 23 may be divided into three or more separate members.

[0079] In order to help readers more easily understand the technical effects brought about by the technical solutions of the embodiments of this application, the operating principle of the heating device 100 is briefly described below.

[0080] When the aerosol generation article 2000 is accommodated in the receiving cavity 11 of the heat preservation assembly 10, part of the circumferential outer surface of the aerosol generation article 2000 is substantially attached to the inner surface of the inner tube portion 12. When the external power supply supplies power to the heating element 22, the heating element 22 heats the air guide element 21 or the air guide element 21 generates heat by self-heating under the action of the heating element 22, air flowing through a channel of the air guide element 21 is heated, and the heated air enters the interior of the aerosol generation article 2000 from the air inlet end of the aerosol generation article 2000 for heating. In addition, the inner tube portion 12 of the heat preservation assembly 10 is heated by the heating assembly and has a certain amount of heat. Since part of the circumferential outer surface of the aerosol generation article 2000 is substantially attached to the inner surface of the inner tube portion 12, the heat of the inner tube portion 12 can be transferred to part of the circumferential outer surface of the aerosol generation article 2000, to perform auxiliary heating on the aerosol generation article 2000, so that the aerosol generation article 2000 is heated more evenly.

[0081] The heating device 100 in the embodiments of this application includes a heat preservation assembly 10 and an airflow heating assembly 20. The heat preservation assembly 10 is internally provided with a receiving cavity 11. The receiving cavity 11 is configured to accommodate an aerosol generation article 2000. The airflow heating assembly 20 is arranged in the receiving cavity 11. The airflow heating assembly 20 is configured to heat a gas flowing through the airflow heating assembly 20, so that the heated gas heats the aerosol generation article 2000 placed in the receiving cavity 11. When the aerosol generation article 2000 is placed in the receiving cavity 11, an inner surface of the heat preservation assembly 10 is substantially attached to a circumferential outer surface of the aerosol generation article 2000, and heat of an inner wall surface of the heat preservation assembly 10 can be transferred to the circumferential outer surface of the aerosol generation article 2000 for auxiliary heating, so that the heat of the heat preservation assembly 10 is effectively used to heat the circumferential outer surface of the aerosol generation article 2000, and parts and components of the heating device 100 are reduced.

[0082] Based on the same inventive concept, referring to FIG. 14, this application further provides an aerosol generating device 1000, including a housing 200, a circuit device 300, a sheath 400, and the above heating device 100. The sheath 400 is sleeved on an outer side of the heating device 100, and the sheath 400 is configured to accommodate and support the heating device 100. The circuit device 300, the sheath 400, and the heating device 100 are all accommodated in the housing 200, and the circuit device 300 is electrically connected to the heating device 100. The circuit device 300 is configured to provide electric energy for the heating device 100, so that the heating device 100 can heat the aerosol generation article 2000. The housing 200 is configured to accommodate and fix the circuit device 300 and the sheath 400.

[0083] For the above housing 200, referring to FIG. 15, the housing 200 is provided with a receiving space 201, a first socket 202, a separating plate 203, and a fourth through hole 204. The separating plate 203 is arranged in the receiving space 201, and the separating plate 203 separates the receiving space 201 into a first accommodating cavity 2011 and a second accommodating cavity 2012 arranged in a top-to-bottom direction. The first accommodating cavity 2011 is configured to accommodate the sheath 400, the heating device 100, and part of the circuit device 300. The second accommodating cavity 2012 is configured to accommodate part of the circuit device 300. The first socket 202 is arranged on a side wall of the housing 200, and the first socket 202 brings the first accommodating cavity 2011 into communication with an outside environment. In addition, the first socket 202 is in communication with the receiving cavity 11 of the heat preservation assembly 10 in the heating device 100. The first socket 202 is configured to allow insertion or removal of the aerosol generation article 2000 into or from the receiving cavity 11 of the heat preservation assembly 10 in the heating device 100. In some embodiments, the first accommodating cavity 2011 and the second accommodating cavity 2012 are sealed to improve airtightness of the second accommodating cavity 2012 and reduce a possibility that operating performance of the circuit device 300 accommodated in the second accommodating cavity 2012 is affected by the outside environment or the gas in the heating device 100. The fourth through hole 204 is provided on the side wall of the housing 200. The fourth through hole 204 brings the first accommodating cavity 2011 into communication with the outside environment. The fourth through hole 204 is configured for exposure of part of the circuit device 300, so that the external power supply can be electrically connected to the circuit device 300. The fourth through hole 204 is further configured to allow an external gas to enter the first accommodating cavity 2011, so as to enter the heating device 100 to be heated.

[0084] For the foregoing circuit device 300, referring to FIG. 14 and FIG. 15, the circuit device 300 includes a printed circuit board (PCB) 301, a battery module 302, and a charging interface 303. The PCB 301 and the charging interface 303 are both arranged in the first accommodating cavity 2011, and the charging interface 303 is exposed at the fourth through hole 204. The battery module 302 is disposed in the second accommodating cavity 2012. The PCB 301 is electrically connected to the heating element 22, the temperature measurement element 30, the battery module 302, and the charging interface 303 in the heating device 100. The PCB 301 is configured to perform parameter control and data acquisition on the heating element 22 and the temperature measurement element 30. The battery module 302 is configured to supply electric energy to the heating element 22 and the temperature measurement element 30, and the charging interface 303 is configured for insertion of an external power connector to realize charging of the battery module 302 or directly supply electric energy to the heating element 22 and the temperature measurement element 30 by using the external power supply.

[0085] In some embodiments, the charging interface 303 may not be provided, and the battery module 302 may use a detachable lithium battery, or the like. In some embodiments, two or more PCB 301 are arranged. The two or more PCB 301 are stacked in parallel in the first accommodating cavity 2011, and the PCB 301 and the sheath 400 are arranged in the first accommodating cavity 2011 in a left-to-right direction, so that a layout of the PCB 301 and the sheath 400 is more reasonable.

[0086] In some embodiments, sealing treatment may be performed between the first accommodating cavity 2011 and the second accommodating cavity 2012 based on actual requirements, to prevent a gas generated by the air guide element 21 in the first accommodating cavity 2011 heating the aerosol generation article 2000 from entering the second accommodating cavity 2012 and affecting the operating performance of the battery module 302.

[0087] For the above sheath 400, referring to FIG. 14 to FIG. 16, the sheath 400 includes an upper shell 402 and a lower shell 403. The upper shell 402 and the lower shell 403 jointly define a first mounting cavity 401. The first mounting cavity 401 is configured to accommodate the heating device 100 and allow insertion of an aerosol generation article 2000. An end of the upper shell 402 facing away from the lower shell 403 is further provided with a second socket 4021. The second socket 4021 brings the first mounting cavity 401 into communication with the outside environment. The second socket 4021 is in direct communication with the first socket 202, so that the external aerosol generation article 2000 can enter the first mounting cavity 401 through the first socket 202 and the second socket 4021, and then enter the receiving cavity 11 of the heat preservation assembly 10 in the heating device 100.

[0088] An inner surface of the first mounting cavity 401 is provided with a first convex rib 4011, a step surface 4012, and a second convex rib 4013. At least one first convex rib 4011 is arranged. The at least one first convex rib 4011 extends from the second socket 4021 toward a cavity bottom of the first mounting cavity 401. The first convex rib 4011 is configured to abut against the outer surface of the aerosol generation article 2000 inserted into the first mounting cavity 401. The first convex rib 4011 supports the aerosol generation article 2000 relative to the inner surface of the first mounting cavity 401 to form an air guide groove. The air guide groove is configured to allow an external gas to enter the first mounting cavity 401. The first convex rib 4011 is further configured to abut against the outer surface of the outer tube portion 13 of the heat preservation assembly 10. The first convex rib 4011 supports the heat preservation assembly 10 relative to the inner surface of the first mounting cavity 401 to form the air guide groove, so that the external gas can smoothly enter the cavity bottom of the first mounting cavity 401.

[0089] The step surface 4012 is arranged on the inner surface of the first mounting cavity 401. The step surface 4012 is configured to abut against one end of the heat preservation assembly 10 in the heating device 100. The step surface 4012 and the cavity bottom of the first mounting cavity 401 jointly fix the heat preservation assembly 10 in the first mounting cavity 401. Certainly, an air guide groove is still formed at a position where one end of the heat preservation assembly 10 abuts against the step surface 4012. The second convex rib 4013 is arranged at the cavity bottom of the first mounting cavity 401, and the second convex rib 4013 supports an other end of the heat preservation assembly 10 relative to the cavity bottom to form an air guide groove, so that the gas entering the cavity bottom of the first mounting cavity 401 can enter the air guide element 21 to be heated.

[0090] The lower shell 403 is provided with a second mounting cavity 4031 and a first through hole 4032. The second mounting cavity 4031 is provided on an outer side of the lower shell 403, and the first through hole 4032 extends through a side wall of the lower shell 403 to extend through the first mounting cavity 401 and the second mounting cavity 4031. The second mounting cavity 4031 is configured to accommodate the PCB 301. The first through hole 4032 is configured to allow a cable connecting the PCB 301 to the heating element 22 and the temperature measurement element 30 in the heating device 100 to pass through, and / or for the external gas to enter the second mounting cavity 4031 from the fourth through hole 204 and then enter the cavity bottom of the first mounting cavity 401 from the second mounting cavity 4031 to be heated in the air guide element 21.

[0091] In some embodiments, the upper shell 402 and the lower shell 403 may be integrally formed. In some embodiments, referring to FIG. 17 and FIG. 18, the aerosol generating device 1000 further includes an end cap 500. The end cap 500 is arranged at the cavity bottom of the first mounting cavity 401. Two ends of the end cap 500 respectively abut against the air guide element 21 of the heating device 100 and the second convex rib 4013. The end cap 500 is made of a material with low thermal conductivity, and the end cap 500 is configured to prevent the air guide element 21 from directly contacting the cavity bottom of the first mounting cavity 401 and transferring heat to the lower shell 403 excessively fast. The end cap 500 is provided with a second through hole 501 and a third convex rib 502. The second through hole 501 is configured to allow the gas at the cavity bottom of the cavity to flow to the air guide element 21 and allowing the cable connecting the PCB 301 to the heating element 22 and the temperature measurement element 30 in the heating device 100 to pass through.

[0092] In some embodiments, referring to FIG. 17 and FIG. 19, the aerosol generating device 1000 further includes a second thermal insulation member 600. The second thermal insulation member 600 is arranged on a side of the end cap 500 facing the heating device 100, that is, the second thermal insulation member 600 is located between the air guide element 21 and the end cap 500. The second thermal insulation member 600 is made of a material with low thermal conductivity. The second thermal insulation member 600 is configured to reduce heat transferred from the air guide element 21 to the end cap 500. The second thermal insulation member 600 is provided with a third through hole 601 and a fourth convex rib 602. The third through hole 601 is configured to allow a gas to flow and for allowing the cable connecting the PCB 301 to the heating element 22 and the temperature measurement element 30 in the heating device 100 to pass through. The third convex rib 502 forms point contact with the second thermal insulation member 600, and the fourth convex rib 602 is arranged at an end of the second thermal insulation member 600 close to the air guide element 21. The fourth convex rib 602 is configured to form point contact with the air guide element 21.

[0093] In the embodiment of this application, the second thermal insulation member 600 and the end cap 500 are arranged between the air guide element 21 and the cavity bottom of the first mounting cavity 401 for double thermal insulation, and the second thermal insulation member 600 is connected to the air guide element 21 and the end cap 500, and the end cap 500 is connected to the cavity bottom both in a manner of point contact, thereby effectively reducing the heat directly transferred by the air guide element 21 to the lower shell 403. On the one hand, the sheath 400 can operate in a relatively low temperature environment, thereby effectively prolonging a service life of the sheath 400. On the other hand, the heat loss of the air guide element 21 can be effectively reduced, and the thermal efficiency of the air guide element 21 is improved. It may be understood that, in some embodiments, the second thermal insulation member 600 and the end cap 500 may be integrally formed.

[0094] In the embodiment of this application, the second thermal insulation member 600 and the end cap 500 are made of ZrO2 (zirconium dioxide) and a compound thereof, and the second thermal insulation member 600 and the end cap 500 have at least characteristics of high temperature resistance, low thermal conductivity, and corrosion resistance. In some other embodiments, the second thermal insulation member 600 and / or the end cap 500 may also be made of a thermal insulation material such as metal and / or non-metal and a compound thereof, to reduce production costs.

[0095] Based on the same inventive concept, this application further provides an embodiment of an aerosol generating system 10000. Referring to FIG. 14 and FIG. 20, the aerosol generating system 10000 includes an aerosol generation article 2000 and the above aerosol generating device 1000. The aerosol generating device 1000 is configured for insertion of the aerosol generation article 2000, and the aerosol generating device 1000 heats the aerosol generation article 2000 to generate smoke for a user to inhale. The aerosol generation article 2000 includes at least a tobacco section 2001, a cooling section 2002, and a mouthpiece section 2003. The tobacco section 2001, the cooling section 2002, and the mouthpiece section 2003 are connected in sequence, and when the aerosol generation article 2000 is inserted into the receiving cavity 11 of the heat preservation assembly 10, an axial length L2 of the tobacco section 2001 is equal to or slightly greater than a length L3 of the tobacco section 2001 inserted into the receiving cavity 11, to ensure that the cooling section 2002 is not heated by the inner tube portion 12 of the heat preservation assembly 10, thereby affecting cooling performance of the cooling section 2002. The axial length L2 of the tobacco section 2001 being slightly greater than the length L3 of the tobacco section 2001 inserted into the receiving cavity 11 means that a difference between the axial length L2 of the tobacco segment 2001 and the length L3 of the tobacco section 2001 inserted into the receiving cavity 11 is in a range of 0.5 mm≤L2−L3≤2 mm. It may be understood that the aerosol generation article 2000 may further include another section, for example, a filter section, an essential oil section, a filter tip section, or the like.Embodiment II

[0096] Mainly referring to FIG. 21, a heating device 100a includes a tubular body 10a, an airflow channel 30a, and an airflow heating assembly 20a. The tubular body 10a has a containing cavity inside. The containing cavity is configured to receive at least part of an aerosol generation article 2000. The airflow channel 30a is in fluid communication with the containing cavity, and air enters the containing cavity through the airflow channel.

[0097] In an example, as shown in FIG. 21, the air enters the containing cavity from a distal end of the containing cavity. It may be understood that in another example, the air may further enter the containing cavity from a middle region of the containing cavity.

[0098] In an example, at least part of the airflow channel 30a is located inside the tubular body 10a, and the airflow heating assembly 20a is arranged in the airflow channel 30a. The air flowing through the airflow channel 30a flows through the airflow heating assembly 20a, so that the airflow heating assembly 20a can heat the air flowing through the airflow channel 30a. In another example, the airflow channel is located outside the tubular body, at least part of the airflow channel may be defined by an air channel tube, the airflow heating assembly may be located in the airflow channel, or the airflow heating assembly may be arranged around the air channel tube.

[0099] The airflow heating assembly 20a is configured to heat the air flowing through the airflow channel 30a into hot air, and the hot air may flow into an interior of the aerosol generation article 2000 from a distal end of the aerosol generation article 2000 to heat a tobacco section in the aerosol generation article 2000 to generate an aerosol. Certainly, it is not excluded that in another embodiment, the hot air may flow into the interior of the aerosol generation article 2000 from a side wall of the aerosol generation article 2000.

[0100] An end of the tubular body 10a is provided with a first opening 111a, and at least part of the aerosol generation article 2000 is inserted into the containing cavity for accommodation through the first opening 111a. The end with the first opening in the tubular body is defined as a proximal end m1 of the heating device, and a distal end m2 of the heating device is arranged opposite to the proximal end m1. It may be understood that for other parts and components such as the airflow heating assembly and the proximal end m1 and the distal end m2 of the airflow channel, reference may also be made to the above definition.

[0101] For the above tubular body 10a, the containing cavity therein includes a first containing cavity 114a and a second containing cavity 115a. Along a flow direction of the air in the containing cavity, the first containing cavity 114a is located downstream of the second containing cavity 115a. With a proximal end of the tubular body 10a as a reference point, the second containing cavity 115a is provided adjacent to a distal end of the first containing cavity 114a. The first containing cavity 114a and the second containing cavity 115a are both configured to contain a portion of the aerosol generation article 2000. An inner containing diameter of the second containing cavity 115a is greater than a containing radius of the first containing cavity 114a. Since the second containing cavity 115a is located upstream of the first containing cavity 114a, the hot air flows through the aerosol generation article 2000 located in the second containing cavity 115a and then flows into the aerosol generation article 2000 located in the first containing cavity 114a, so that a temperature of a wall defining the second containing cavity 115a in the tubular body 10a is higher than a temperature of a wall defining the first containing cavity 114a in the tubular body 10a.

[0102] In an example, the tubular body is not an integrally formed tube, and the wall defining the first containing cavity and the wall defining the second containing cavity in the tubular body are connected by assembly. In an example, the wall defining the first containing cavity and the wall defining the second containing cavity in the tubular body are made of different materials.

[0103] In the embodiments shown in FIG. 21 and FIG. 22, the tubular body 10a includes a first tubular body 11a.

[0104] In an example, the first tubular body 11a contains a thermal insulation material, so that the first tubular body 11a has a thermal insulation function. The thermal insulation material means that a thermal conductivity of a material is less than 100 W / m·K, preferably less than 40 W / m·K or less than 10 W / m·K at 23° C. and a relative humidity of 50%. For example, the thermal insulation material may be made of at least one of a PAEK-based material, a PI material, or a PBI material. The PAEK-based material includes a material such as glass fiber, glass felt, ceramics, silica, alumina, PEEK, PEKK, PEKEKK, or PEK. The PAEK-based material includes a material such as PEEK, PEKK, PEKEKK, or PEK.

[0105] In an example, the first tubular body 11a includes a thermal insulation material surrounding a periphery of the first tubular body 11a.

[0106] In an example, mainly referring to FIG. 21 and FIG. 22, the tubular body 10a further includes a second tubular body 12a. The second tubular body 12a is arranged on a periphery of the first tubular body 11a, and a cavity 13a is formed between the first tubular body 11a and the second tubular body 12a. The first tubular body 11a is configured to receive and fix at least part of the aerosol generation article, and the cavity 13a is configured to reduce heat transferred from the first tubular body 11a to the second tubular body 12a. The cavity 13a may form a negative pressure thermal insulation layer or a gas thermal insulation layer, that is, an interior of the cavity 13a is in a vacuum negative pressure state or filled with a gas. In other words, an air pressure in the cavity 13a may be less than or equal to an outside atmospheric pressure, or may be less than or equal to a standard atmospheric pressure. The gas filled in the cavity 13a may be a certain gas, which may be for example pure carbon dioxide, pure nitrogen, or pure argon. The gas filled in the cavity 13a may be a mixed gas composed of a plurality of gases. The gas filled in the cavity 13a may be air. Certainly, in another embodiment, the cavity 13a may further be filled with a thermal insulation material. In this example, the first tubular body 11a may include metal.

[0107] The first tubular body 11a includes a first portion 112a and a second portion 113a. The first portion 112a defines a first containing cavity 114a, and the first portion 112a is further provided with a first opening 111a. The first opening 111a brings the first containing cavity 114a into communication with an outside environment. The second portion 113a defines a second containing cavity 115a, and the first containing cavity 114a and the second containing cavity 115a are in air communication. The aerosol generation article is inserted into the first containing cavity 114a and the second containing cavity 115a through the first opening 111a. Since the second containing cavity 115a is located upstream of the first containing cavity 114a based on the flow direction of the hot air, a temperature of the second portion 113a may be higher than a temperature of the first portion 112a. An inner diameter of the second portion 113a is greater than an inner diameter of the first portion 112a, so that a gap is defined between an outer peripheral surface of the aerosol generation article 2000 and the second portion 113a. The second portion 113a is prevented from transferring heat to the aerosol generation article 2000 through the gap, which helps increase thermal resistance between the second portion 113a and the aerosol generation article 2000, and prevents the aerosol generation article 2000 contained in the second containing cavity 115a from being carbonized or burned due to overheating. The first portion 112a may be attached to the outer peripheral surface of the aerosol generation article 2000 to clamp the aerosol generation article 2000, thereby helping to keep the aerosol generation article 2000 inside the tubular body 10a.

[0108] In addition, the gap between the aerosol generation article and the second portion 113a may be filled with the hot air entering the second containing cavity 115a, which is helpful to make the aerosol generation article 2000 located in the second containing cavity 115a heated more evenly and improve quality of the generated aerosol.

[0109] In an embodiment, the tubular body 10a or the first tubular body 11a includes a heating portion. The heating portion may be an electric heating portion. For example, the heating portion includes a resistive material. The resistive material can generate Joule heat when energized, or for example, the heating portion includes an infrared coating. The infrared coating can radiate infrared rays to the containing cavity when energized. The heating portion enables the tubular body 10a or the first tubular body 11a to generate heat, so that the tubular body 10a or the first tubular body 11a can cooperate with the airflow heating assembly 20a to jointly heat the aerosol generation article 2000 contained in the containing cavity. Under the action of hot air, a temperature of the second containing cavity 115a is higher than a temperature of the first containing cavity 114a. Therefore, to prevent the aerosol generation article 2000 located in the second containing cavity 115a from being overheated, the inner containing diameter of the second containing cavity 115a is designed to be greater than the inner containing diameter of the first containing cavity 114a, which may prevent the aerosol generation article 2000 from contacting with a cavity wall of the second containing cavity 115a and prevent local overheating of the aerosol generation article 2000.

[0110] Mainly referring to FIG. 22, along a length direction of the tubular body 10a, an extension length L4 of the second containing cavity 115a satisfies 2 mm≤L4≤3 mm. For example, the extension length L4 of the second containing cavity 115a may be 2.3 mm, 2.5 mm, 2.8 mm, or the like. A difference between an inner diameter D2 of the second portion 113a and an inner diameter D1 of the first portion 112a satisfies 0.6 mm≤D2-D1≤1 mm.

[0111] In some embodiments, mainly referring to FIG. 22 and FIG. 23, the first portion 112a and the second portion 113a have the same outer diameter. To be specific, the first tubular body 11a has different wall thicknesses at the first portion 112a and the second portion 113a. The second portion 113a having a smaller wall thickness than the first portion 112a may be formed by forming a groove on an inner wall of the first tubular body 11a.

[0112] In another embodiment, the first portion 112a and the second portion 113a have the same wall thickness, and a part of the first tubular body 11a may be formed by using a shaping process, to form a second portion 113a that arches outward relative to the first portion 112a along a radial direction of the first tubular body 11a, or form a first portion 112a that tightens inward relative to the second portion 113a along the radial direction of the first tubular body 11a. In this example, the first tubular body 11a may be made of metal, so that it is convenient to perform stamping processing on the first tubular body 11a, for example, stamping outward to form the outwardly arched second portion 113a, or stamping inward to form the inwardly tightened first portion 112a.

[0113] It should be noted that the first tubular body 11a and the second tubular body 12a may further be formed by using another suitable process such as injection molding or casting.

[0114] It should be noted that the second tubular body 12a may also be made of metal, so that a proximal end of the first tubular body 11a and a proximal end of the second tubular body 12a may be connected by welding, and a distal end of the first tubular body 11a and a distal end of the second tubular body 12a may also be connected by welding, which helps to form a sealed cavity 13a between the first tubular body 11a and the second tubular body 12a.

[0115] In some embodiments, mainly referring to FIG. 21 and FIG. 22, an inner wall surface of the tubular body 10a is further provided with a second protrusion 14a. The second protrusion 14a is located between the airflow heating assembly 20a and the second containing cavity 115a, and a proximal end of the airflow heating assembly 20a abuts against the second protrusion 14a, so as to fixedly mount the airflow heating assembly 20a inside the tubular body 10a. A minimum inner diameter of the second protrusion 14a is greater than or equal to the inner containing diameter of the first containing cavity 114a. Since the second protrusion 14a may be a continuous annular second protrusion 14a or may be bumps annularly arranged at intervals, it is only necessary that the minimum inner diameter of the second protrusion 14a is greater than or equal to the inner containing diameter of the first containing cavity 114a. When the minimum inner diameter of the second protrusion 14a is equal to the inner containing diameter of the first containing cavity 114a, the second protrusion 14a forms line contact with an outer peripheral surface of an end portion of the aerosol generation article. Compared with surface contact, the line contact design may effectively reduce heat transferred directly from the second protrusion 14a to the end portion of the aerosol generation article. When the minimum inner diameter of the second protrusion 14a is greater than the inner containing diameter of the first containing cavity 114a, the second protrusion 14a does not come into contact with the end portion of the aerosol generation article, so that the heat directly transferred from the second protrusion 14a to the end portion of the aerosol generation article may be further reduced.

[0116] For the above airflow heating assembly 20a, mainly referring to FIG. 21, the airflow heating assembly 20a includes a third thermal insulation member 21a and an airflow heating member 22a. The third thermal insulation member 21a is arranged at a proximal end of the airflow heating member 22a, and a proximal end of the third thermal insulation member 21a abuts against the second protrusion 14a. The airflow heating member 22a is configured to heat air in the airflow channel 30a to form hot air, and the third thermal insulation member 21a is configured to reduce heat directly transferred from the airflow heating member 22a to the tubular body 10a.

[0117] In some embodiments, mainly referring to FIG. 24, to better support the end portion of the aerosol generation article so that the end portion of the aerosol generation article is located in the second containing cavity 115a, the proximal end of the third thermal insulation member 21a is further provided with a support portion 211a. One or more support portions 211a may be arranged. A plurality of support portions 211a are arranged at intervals, so that hot air can flow to the end portion of the aerosol generation article through a gap between the support portions 211a for heating. It may be understood that the third thermal insulation member 21a may be made of a thermal insulation material. For example, the third thermal insulation member 21a may be made of ceramics.

[0118] The heating device 100a of this application includes a tubular body 10a, an airflow channel 30a, and an airflow heating assembly 20a. A proximal end of the tubular body 10a is provided with a first opening 111a for allowing insertion of the aerosol generation article 2000 therein. A first containing cavity 114a and a second containing cavity 115a for containing part of the aerosol generation article 2000 are successively defined in the tubular body 10a from near to far. An inner containing diameter of the second containing cavity 115a is greater than an inner containing diameter of the first containing cavity 114a. The airflow channel 30a is configured to allow air to enter the second containing cavity 115a, and the airflow heating assembly 20a is configured to heat the air in the airflow channel 30a. Through structure arrangement with the inner containing diameter of the second containing cavity 115a being greater than the inner containing diameter of the first containing cavity 114a, the end portion of the aerosol generation article 2000 inserted into the second containing cavity 115a may be caused not to directly contact the tubular body 10a, and the end portion of the aerosol generation article 2000 is directly heated through hot air, so that an effect of more uniform heating is achieved, to avoid a situation that the end portion of the aerosol generation article 2000 generates smoke as a result of burning due to local overheating, thereby effectively improving the quality of the generated aerosol.

[0119] This application further provides an embodiment of an aerosol generating device. The aerosol generating device includes the above heating device 100a, and further includes a power supply assembly. For a specific structure and functions of the heating device 100a, reference may be made to the above embodiments, and details are not described herein again. The power supply assembly may include any power supply that can provide electric energy for heat generation of the heating device 100a. The power supply may be any suitable battery. The power supply assembly may further include a control panel. The power supply may be electrically connected to the heating device 100a through the control panel. The control panel may control an operation of the aerosol generating device, including but not limited to controlling a heating power, a heating current, a heating voltage, or the like of the heating device 100a.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit this application. Under the idea of this application, the technical features of the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and many other variations of different aspects of this application as described above exist, which are not provided in detail for the sake of simplicity. Although this application has been described in detail with reference to the foregoing embodiments, it should be understood by a person skilled in the art that modifications may still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made to some of the technical features. However, these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of various embodiments of this application.

Examples

embodiment i

[0039]Referring to FIG. 1, a heating device 100 includes a heat preservation assembly 10 and an airflow heating assembly 20. An interior of the heat preservation assembly 10 is provided with a receiving cavity 11 in communication with an outside environment. The airflow heating assembly 20 is arranged at one end of the receiving cavity 11, and an other end of the receiving cavity 11 is configured to accommodate an aerosol generation article 2000. When the aerosol generation article 2000 is placed in the receiving cavity 11, an air inlet end of the aerosol generation article 2000 is close to the airflow heating assembly 20, and an inner surface of the heat preservation assembly 10 is substantially attached to a circumferential outer surface of the aerosol generation article 2000. The substantial attachment means that a distance L1 between the inner surface of the heat preservation assembly 10 and the circumferential outer surface of the aerosol generation article 2000 placed in the r...

embodiment ii

[0096]Mainly referring to FIG. 21, a heating device 100a includes a tubular body 10a, an airflow channel 30a, and an airflow heating assembly 20a. The tubular body 10a has a containing cavity inside. The containing cavity is configured to receive at least part of an aerosol generation article 2000. The airflow channel 30a is in fluid communication with the containing cavity, and air enters the containing cavity through the airflow channel.

[0097]In an example, as shown in FIG. 21, the air enters the containing cavity from a distal end of the containing cavity. It may be understood that in another example, the air may further enter the containing cavity from a middle region of the containing cavity.

[0098]In an example, at least part of the airflow channel 30a is located inside the tubular body 10a, and the airflow heating assembly 20a is arranged in the airflow channel 30a. The air flowing through the airflow channel 30a flows through the airflow heating assembly 20a, so that the airf...

Claims

1. A heating device for heating an aerosol generation article, the heating device comprising:a heat preservation assembly, comprising an inner tube portion and an outer tube portion, wherein the inner tube portion is internally provided with a receiving cavity, the outer tube portion is arranged around the inner tube portion, a cavity is jointly defined by the outer tube portion and the inner tube portion, and the receiving cavity is configured to accommodate the aerosol generation article; andan airflow heating assembly, arranged in the receiving cavity, wherein the airflow heating assembly is configured to heat a gas flowing through the airflow heating assembly, so that the heated gas heats the aerosol generation article placed in the receiving cavity.

2. The heating device according to claim 1, whereinan interior of the cavity is vacuum or filled with a medium with low thermal conductivity.

3. The heating device according to claim 1, whereinthe airflow heating assembly comprises an air guide element and a heating element, the air guide element is provided with a plurality of air guide channels extending through the air guide element, the heating element is configured to heat the air guide element, or the air guide element spontaneously generates heat under an action of the heating element.

4. The heating device according to claim 3, whereinthe heating element is a heating member; andthe air guide element is provided with a first mounting groove, and the first mounting groove is configured to allow mounting of the heating member.

5. (canceled)6. The heating device according to claim 4, whereinthe heating member is spirally formed by a heating wire; orthe heating member has a vent air gap.

7. The heating device according to claim 3, whereinthe heating element is a metal heating mesh or a flexible printed circuit (FPC) heating film.

8. The heating device according to claim 3, whereinthe heating element comprises a resistive heating element, a first insulating layer, and a second insulating layer;the resistive heating element is arranged around an outer peripheral surface of the air guide element; andthe first insulating layer is arranged between the air guide element and the resistive heating element, and the second insulating layer is arranged between the resistive heating element and an inner surface of the heat preservation assembly.

9. The heating device according to claim 3, whereinthe heating element comprises an induction coil, the induction coil is electrically connected to an external power supply, and the induction coil is sleeved on an outer peripheral surface of the air guide element.

10. The heating device according to claim 9, whereinthe heating element further comprises a bracket, the induction coil is wound around the bracket, and the bracket is sleeved on the outer peripheral surface of the air guide element.

11. The heating device according to claim 10, whereinthe heating element further comprises a magnetic field shielding layer, and the magnetic field shielding layer is arranged between the induction coil and the inner tube portion.

12. The heating device according to claim 3, whereinthe heating element is a heating circuit coating, the heating circuit coating is applied onto an inner wall surface of the inner tube portion, and the heating circuit coating is electrically connected to an external power supply.

13. The heating device according to claim 1, whereinthe receiving cavity comprises a first chamber and a second chamber that are in communication with each other along a first direction, the first chamber is configured to allow mounting of the airflow heating assembly, the second chamber is configured to allow mounting of the aerosol generation article, a cross-sectional area of the first chamber is greater than a cross-sectional area of the second chamber, and a cross section of the first chamber and a cross section of the second chamber are both perpendicular to the first direction.

14. The heating device according to claim 3, whereina circumferential outer surface of the air guide element is provided with a first mounting region and a second mounting region, the first mounting region is configured to connect to an inner surface of the inner tube portion to cause the air guide element to be fixed to the inner tube portion, and the second mounting region is not connected to the inner surface of the inner tube portion.

15. The heating device according to claim 14, whereinthe airflow heating assembly further comprises a first thermal insulation member, the first thermal insulation member is arranged in the first mounting region, and the first thermal insulation member abuts against the air guide element and the inner tube portion.

16. The heating device according to claim 15, whereinan outer surface of the first thermal insulation member facing away from the air guide element is provided with a first protrusion, and the first protrusion abuts against the inner surface of the inner tube portion to form line contact or point contact; oran outer surface of the air guide element is provided with a first protrusion, and the first protrusion abuts against an inner surface of the first thermal insulation member to form line contact or point contact.

17. (canceled)18. The heating device according to claim 3, whereinthe air guide element is made of graphite or a graphite alloy.19-21. (canceled)22. A heating device for heating an aerosol generation article, the heating device comprising:a heat preservation assembly, internally provided with a receiving cavity, wherein the receiving cavity is configured to accommodate an aerosol generation article, and when the aerosol generation article is placed in the receiving cavity, an inner surface of the heat preservation assembly is substantially attached to a circumferential outer surface of the aerosol generation article; andan airflow heating assembly, arranged in the receiving cavity, wherein the airflow heating assembly is configured to heat a gas flowing through the airflow heating assembly, so that the heated gas heats the aerosol generation article placed in the receiving cavity.

23. The heating device according to claim 22, whereinthe heat preservation assembly comprises an inner tube portion and an outer tube portion, the inner tube portion is internally provided with the receiving cavity, the outer tube portion is arranged around the inner tube portion, a closed cavity is jointly defined by the outer tube portion and the inner tube portion, and the closed cavity is vacuum or filled with an inert gas with low thermal conductivity.24-39. (canceled)40. An aerosol generating device, comprising a housing, a circuit device, a sheath, and the heating device according to claim 1, wherein the housing is provided with a containing space and a first socket, the first socket is communication with the receiving cavity, the containing space is configured to accommodate the circuit device, the sheath, and the heating device, the sheath is sleeved outside the heating device, the sheath is configured to accommodate and support the heating device, the first socket is configured to allow insertion or removal of an external aerosol generation article into or from the sheath and the heating device, the circuit device is electrically connected to the heating device, and the circuit device is configured to provide electric energy for the heating device.41-49. (canceled)50. An aerosol generating system, comprising an aerosol generation article and the aerosol generating device according to claim 40, wherein the aerosol generating device is configured to allow insertion of the aerosol generation article, the aerosol generating device is configured to heat the aerosol generation article inserted into the receiving cavity, the aerosol generation article comprises at least a tobacco section, a cooling section, and a mouthpiece section, the tobacco section, the cooling section, and the mouthpiece section are connected in sequence, and when the aerosol generation article is inserted into the receiving cavity, an axial length of the tobacco section is equal to or slightly greater than a length of the tobacco section inserted into the receiving cavity.

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