Heating assembly and aerosol generating device

Abstract

The utility model relates to a heating assembly and an aerosol generating device, and the heating assembly comprises a first heating pipe extending in the longitudinal direction, a first containing cavity used for containing a part of an aerosol generating product is formed in the first heating pipe, the first heating pipe comprises a first base pipe and a first heating layer arranged on the first base pipe, and the first heating pipe is configured to release heat; the heating device is used for heating the aerosol generating product in the first accommodating cavity; the second heating pipe extends in the longitudinal direction, a second containing cavity used for containing a part of the aerosol generating product is formed in the second heating pipe, the second heating pipe comprises a second base pipe and a second heating layer arranged on the first base pipe, and the second heating pipe is configured to release heat to heat the aerosol generating product located in the second containing cavity; the connecting piece is connected with the first heating pipe and the second heating pipe; the first containing cavity and the second containing cavity are communicated with each other.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of aerosol generation, in particular to a heating assembly and an aerosol generating device. BACKGROUND

[0002] The aerosol generating device is a device for generating smoke without burning. In the existing first exemplary aerosol generating device, the heating assembly comprises a tubular substrate, a first heating layer arranged on a first heating area of the tubular substrate, and a second heating layer arranged on a second heating area of the tubular substrate, at least a part of the smoking article can be accommodated in the tubular substrate, and the first heating layer and the second heating layer are respectively used to heat different sections of the smoking article, so as to perform segmented heating on the smoking article.

[0003] However, when only one of the first heating layer and the second heating layer generates heat, or when the heating efficiency of the two is different, the heat on the heating area with a higher temperature will be transferred to the heating area with a lower temperature through the tubular substrate in a large amount, causing the heating area with a higher temperature to have a reduced temperature rising speed because a large amount of heat is transferred to the heating area with a lower temperature, and the heating area with a lower temperature to have a higher temperature because a large amount of heat is absorbed. Therefore, if the heating area with a higher temperature reaches its preset temperature, the temperature of the heating area with a lower temperature will be too high, and if the temperature of the heating area with a lower temperature is controlled to meet the preset low temperature, the heating area with a higher temperature will not reach its preset high temperature. Thus, the expected effect of the aerosol generating device on the segmented heating of the smoking article is reduced or even lost, affecting the smoking experience of the user.

[0004] In the existing second exemplary aerosol generating device, different from the first exemplary aerosol generating device, after the first heating layer and the second heating layer are arranged on the tubular substrate, the tubular substrate is cut to form a through hole on the tubular substrate between the first heating layer and the second heating layer, so as to increase the thermal resistance between the first heating area and the second heating area.

[0005] However, the cutting will cause micro-cracks on the heating layer formed on the tubular substrate by printing, stress is concentrated on the micro-cracks, and the micro-cracks will expand in the process of repeated heating and cooling of the heating assembly, thereby damaging the integrity of the heating layer, causing uneven heating of the heating layer, and even causing the heating layer to lose the heating function in whole or in part, which will shorten the service life of the heating assembly. Utility model content

[0006] The purpose of the present application is to provide a heating assembly and an aerosol generating device, which can prolong the service life of the heating assembly.

[0007] Some embodiments of the present application provide a heating assembly, the heating assembly comprising:

[0008] a first heating tube extending in a longitudinal direction, having a first accommodation cavity inside for accommodating a portion of an aerosol generating article, the first heating tube comprising a first base tube, a first heating layer arranged on the first base tube, the first heating tube being configured to release heat to heat the aerosol generating article located in the first accommodation cavity;

[0009] a second heating tube extending in a longitudinal direction, having a second accommodation cavity inside for accommodating a portion of an aerosol generating article, the second heating tube comprising a second base tube, a second heating layer arranged on the first base tube, the second heating tube being configured to release heat to heat the aerosol generating article located in the second accommodation cavity; and

[0010] a connecting member connecting the first heating tube and the second heating tube;

[0011] wherein the first accommodation cavity and the second accommodation cavity are in communication with each other.

[0012] As an example, the first base tube comprises a first metal tube, the first heating tube further comprises a first insulating layer arranged on the first metal tube, and the first heating layer is arranged on the first insulating layer; and / or

[0013] the second base tube comprises a second metal tube, the second heating tube further comprises a second insulating layer arranged on the second metal tube, and the second heating layer is arranged on the second insulating layer.

[0014] As an example, the first heating tube has a gap between a distal end of the first heating tube and a proximal end of the second heating tube.

[0015] As an example, the connecting member comprises a positioning portion, at least a portion of the positioning portion is located in the gap between the distal end of the first heating tube and the proximal end of the second heating tube.

[0016] As an example, the connecting member further comprises a surrounding portion, the positioning portion is located inside the surrounding portion;

[0017] at least a portion of the first heating tube is located in the surrounding portion and is arranged close to an inner wall of the surrounding portion; and / or

[0018] at least a portion of the second heating tube is located in the surrounding portion and is arranged close to the inner wall of the surrounding portion.

[0019] As an example, the first heating tube further comprises a first electrode layer and a second electrode layer electrically connected with the first heating layer, at least a part of the first electrode layer and at least a part of the second electrode layer are exposed outside the surrounding part; and / or

[0020] The second heating tube further comprises a third electrode layer and a fourth electrode layer electrically connected with the second heating layer, at least a part of the third electrode layer and at least a part of the fourth electrode layer are exposed outside the surrounding part.

[0021] As an example, the dimension D1 of the positioning part in the transverse direction satisfies at least one of the following conditions:

[0022] 0.1mm≤D1≤0.5mm;

[0023] D1 is less than or equal to the wall thickness of the surrounding part; and

[0024] D1 is less than or equal to the wall thickness of the first heating tube and / or the second heating tube.

[0025] As an example, the dimension D2 of the gap between the distal end of the first heating tube and the proximal end of the second heating tube in the longitudinal direction satisfies: 0.1mm≤D2≤1mm.

[0026] As an example, the distal end of the first heating tube and the proximal end of the second heating tube have an annular gap therebetween, so that the first heating tube is spaced apart from the second heating tube; or

[0027] The distal end of the first heating tube and the proximal end of the second heating tube are in contact with each other, and the distal end of the first heating tube and the proximal end of the second heating tube have a plurality of gaps therebetween, the plurality of gaps are discretely distributed and arranged in a ring shape.

[0028] As an example, the first heating tube is assembledly connected with the connecting piece, or the first heating tube is connected with the connecting piece in the way of insert molding; and / or

[0029] The second heating tube is assembledly connected with the connecting piece, or the second heating tube is connected with the connecting piece in the way of insert molding.

[0030] As an example, the connecting piece comprises a thermal insulation material, the thermal conductivity of the thermal insulation material is less than 5W / (m·K).

[0031] As an example, the wall thickness of the first base tube is between 0.05mm-0.3mm; and / or

[0032] The wall thickness of the second base tube is between 0.05mm-0.3mm.

[0033] As an example, the first heating tube has a length in the longitudinal direction that is less than or equal to a length in the longitudinal direction of the second heating tube; and / or

[0034] The first heating tube and the second heating tube have the same inner diameter.

[0035] As an example, the first heating layer has a resistance value of 0.35Ω-1Ω; and / or

[0036] The second heating layer has a resistance value of 0.35Ω-1Ω.

[0037] Some embodiments of the present application provide an aerosol generating device, which comprises the heating assembly, and further comprises a power supply configured to independently provide electric power to the first heating layer and the second heating layer; the working phase of the heating assembly comprises a first phase and a second phase, the first heating layer is configured to generate heat in the first phase, and the second heating layer is configured to generate heat in the second phase.

[0038] As an example, the first heating layer is configured to generate heat in the second phase.

[0039] The above heating assembly and aerosol generating device, the heating assembly comprises a first heating tube and a second heating tube, a first containing cavity inside the first heating tube and a second containing cavity inside the second heating tube are in communication with each other, so that the first heating tube and the second heating tube can heat different sections of the aerosol generating article, or can heat different aerosol generating articles respectively. The first heating tube and the second heating tube are connected to each other by a connecting piece, which can reduce the heat transfer between the first heating tube and the second heating tube on the one hand, and can also prevent micro-cracks from appearing on the first heating layer on the first heating tube and the second heating layer on the second heating tube, so that the first heating layer and the second heating layer have good integrity, which helps to prolong the service life of the heating assembly. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the specific embodiments of the present application or the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0041] Figure 1 is a schematic diagram of an aerosol generating device provided by an embodiment of the present application;

[0042] Figure 2 is a schematic diagram of a heating assembly provided by an embodiment of the present application;

[0043] Figure 3 is a disassembled schematic view of a heating assembly provided by an embodiment of the present application;

[0044] Figure 4 is a cross-sectional view of a heating assembly provided by another embodiment of the present application;

[0045] Figure 5 is a disassembled schematic view of a first heating tube provided by an embodiment of the present application;

[0046] Figure 6 is a position schematic view of the first position A1 to the seventh position A7 in a heating assembly provided by an embodiment of the present application;

[0047] in the figure:

[0048] 100, an aerosol generating device;

[0049] 1, a heating assembly; 11, a first heating tube; 111, a first accommodating cavity; 112, a first base tube; 113, a first heating layer; 114, a first insulating layer; 115, a first electrode layer; 116, a second electrode layer; 12, a second heating tube; 121, a second accommodating cavity; 122, a second base tube; 123, a second heating layer; 124, a second insulating layer; 125, a third electrode layer; 126, a fourth electrode layer; 13, a lead wire; 14, a connecting piece; 141, a positioning portion; 142, a surrounding portion;

[0050] 2, an aerosol generating article; 21, an aerosol forming substrate; 22, a mouthpiece;

[0051] 31, a power supply; 32, a controller. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0053] The terms "first", "second", "third", etc. are used herein only to describe the purpose of the embodiments and cannot be construed as indicating or implying relative importance or implying a number or an order of the technical features indicated. All directional indications (such as upper, lower, left, right, front, back, etc.) contained in the embodiments of the present application are only used to explain the relative positions between the components and the movement conditions thereof, and if the specific posture changes, the directional indications will also change accordingly. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0054] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from a potentially infinite number of embodiments that serve the same or similar purpose or functions. Accordingly, the phrase "an embodiment" is not used to identify key or critical embodiments.

[0055] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to or "coupled" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only and are not intended to be limiting.

[0056] Reference will now be made to Figure 1 An embodiment of the present application provides a heating assembly 1 and an aerosol generating device 100 including the same, wherein the aerosol generating device 100 is a device capable of being coupled with an aerosol generating article 2 and capable of allowing the aerosol generating article 2 to generate an aerosol without combustion.

[0057] As used herein, the term "aerosol generating article" refers to an article including an aerosol forming substrate 21 that releases volatile compounds that can form an aerosol when heated. In an embodiment, the aerosol generating article 2 can be removably coupled to the aerosol generating device. The aerosol generating article 2 can be disposable or reusable.

[0058] The aerosol-forming substrate 21 can comprise a tobacco-containing material containing volatile tobacco flavour compounds that are released from the aerosol-forming substrate 21 upon heating. The aerosol-forming substrate 21 can comprise a non-tobacco material. The aerosol-forming substrate 21 can comprise a tobacco-containing material as well as a non-tobacco material. When the aerosol-forming substrate 21 is a solid aerosol-forming substrate, the aerosol-generating article 2 can be a cigarette, a cigar or a cigarillo, etc.

[0059] The aerosol-generating device provided herein is an electrically operated aerosol-generating device, which is capable of converting electrical energy into heat energy, and then releasing the heat energy through the heating assembly 1 to heat the aerosol-forming substrate 21, so that the aerosol-forming substrate 21 generates aerosol. Based on this, in an embodiment, the aerosol-generating device further comprises a power source 31 and a controller 32. The power source 31 can comprise any suitable battery, which can be a lithium-ion battery. Alternatively, the battery can be a nickel-metal hydride battery, a nickel-cadmium battery or a lithium-based battery, such as a lithium-cobalt, lithium-iron-phosphate, lithium-titanate or lithium-polymer battery. The controller 32 is electrically connected to the power source 31, and the controller 32 is capable of controlling the electrical power output of the power source 31, so as to adjust the heating temperature of the heating assembly 1 to the aerosol-forming substrate 21, or adjust the heating section of the heating assembly 1 to the aerosol-forming substrate 21. The controller 32 can also control the overall operation of the aerosol-generating device. In detail, the controller 32 not only controls the operation of the battery and the heating assembly 1, but also controls the operation of other elements in the aerosol-generating device.

[0060] In an embodiment, the heating assembly 1 can comprise a first heating tube 11 extending in a longitudinal direction and a second heating tube 12 extending in the longitudinal direction. Figures 2-4

[0061] The first heating tube 11 has a first accommodation cavity 111 inside for accommodating at least a portion of the aerosol-generating article 2, and the first heating tube 11 is configured to be capable of releasing heat to heat the aerosol-generating article 2 located in the first accommodation cavity 111.

[0062] The second heating tube 12 has a second accommodation cavity 121 inside for accommodating at least a portion of the aerosol-generating article 2, and the second heating tube 12 is configured to be capable of releasing heat to heat the aerosol-generating article 2 located in the second accommodation cavity 121.

[0063] The first heating tube 11 and the second heating tube 12 are arranged on a common central axis, and the first accommodation cavity 111 and the second accommodation cavity 121 are in communication with each other.

[0064] ​For convenience of presentation, it is defined that the first heating tube 11 is arranged adjacent to the proximal end of the second heating tube 12, so that the first heating tube 11 is located downstream of the second heating tube 12 in the direction of the airflow. Therefore, when the first receiving cavity 111 and the second receiving cavity 121 each contain the aerosol generating article 2, the aerosol generated by the aerosol generating article 2 in the second receiving cavity 121 can flow into the aerosol generating article 2 in the first receiving cavity 111.

[0065] In some embodiments, the first receiving cavity 111 and the second receiving cavity 121 are configured to contain different sections of the same aerosol generating article 2, so that the first heating tube 11 and the second heating tube 12 can heat different sections of the same aerosol generating article 2, respectively.

[0066] In some embodiments, the first receiving cavity 111 can contain at least a portion of a first aerosol generating article, and the first heating tube 11 can heat the first aerosol generating article; the second receiving cavity 121 can contain at least a portion of a second aerosol generating article, and the second heating tube 12 can heat the second aerosol generating article. The first aerosol generating article and the second aerosol generating article are independent of each other, so that the first receiving cavity 111 and the second receiving cavity 121 can contain different aerosol generating articles, respectively, and the first heating tube 111 and the second heating tube 121 can heat different aerosol generating articles, respectively.

[0067] For more details, please refer to Figure 3 and Figure 5 The first heating tube 11 can include a first base tube 112 and a first heating layer 113 arranged on the first base tube 112. The first base tube 112 is tubular, and the first receiving cavity 111 is located in the first base tube 112.

[0068] In some embodiments, the first base tube 112 includes a first insulating tube made of an insulating material. For example, the first insulating tube can be made of ceramic, including but not limited to alumina ceramic, aluminum nitride ceramic, and silicon nitride ceramic. Alternatively, for example, the first insulating tube can be made of glass or quartz.

[0069] In such embodiments, the first heating layer 113 can be formed on the surface of the first insulating tube by printing, coating, chemical deposition, physical deposition, ion sputtering, or particle injection.

[0070] In some embodiments, the first base tube 112 includes a tubular body made of an electrically conductive material. For example, the first base tube 112 includes a first metal tube made of metal, including but not limited to aluminum, stainless steel, and aluminum alloy.

[0071] In such embodiments, the first heating tube 11 further comprises a first insulation layer 114 disposed on the first metal tube, and the first heating layer 113 is disposed on the first insulation layer 114, such that the first heating layer 113 is insulatedly connected with the first base tube 112. The first heating layer 113 can be formed on the first insulation layer 114 by printing, coating, chemical deposition, physical deposition, ion sputtering or particle injection.

[0072] The first insulation layer 114 can comprise a metal oxide formed by oxidation of the metal surface of the first metal tube. At least a portion of the first insulation layer 114 can be formed on the first metal tube by printing, coating, chemical deposition, physical deposition, ion sputtering or particle injection.

[0073] The wall thickness of the first metal tube can be between 0.05 mm and 0.3 mm. Preferably, the wall thickness of the first metal tube is between 0.1 mm and 0.2 mm. By making the first metal tube have a smaller thickness, the heat absorbed by the first metal tube from the first heating layer 113 can be reduced, which helps to reduce the loss of the first heating tube 11 and improve the efficiency of the first heating tube 11. Moreover, by making the metal tube have a smaller wall thickness, the cost is lower and the reliability is higher compared with making the insulation tube have a smaller wall thickness.

[0074] In some embodiments, the first base tube 112 comprises a non-light-transmissive tubular body, and at least a portion of the first heating layer 113 is disposed corresponding to the non-light-transmissive tubular body and is disposed on the outside of the non-light-transmissive tubular body.

[0075] In such embodiments, the first heating layer 113 can comprise a resistive heating layer capable of generating Joule heat when an electric current is obtained, and the resistive heating layer can mainly release the Joule heat by heat conduction.

[0076] Suitable resistive heating layers include, but are not limited to, semiconductors such as doped ceramics, conductive ceramics (e.g. molybdenum disilicide), carbon, graphite, metals, metal alloys and composite materials made of ceramic and metal materials. Such composite materials can include doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum and platinum group metals. Examples of suitable metal alloys include stainless steel, Constantan, nickel-containing alloys, cobalt-containing alloys, chromium-containing alloys, aluminum-containing alloys, titanium-containing alloys, zirconium-containing alloys, hafnium-containing alloys, niobium-containing alloys, molybdenum-containing alloys, tantalum-containing alloys, tungsten-containing alloys, tin-containing alloys, gallium-containing alloys, manganese-containing alloys and iron-containing alloys, as well as superalloys based on nickel, iron, cobalt, stainless steel, iron-aluminum-based alloys and iron-manganese-aluminum-based alloys.

[0077] In some embodiments, the first base tube 112 includes a light-transmitting tubular body, and at least a portion of the first heating layer 113 is disposed corresponding to the light-transmitting tubular body and disposed on the outside of the light-transmitting tubular body.

[0078] In such embodiments, the first heating layer 113 may include an infrared heating layer. The infrared heating layer is capable of generating infrared radiation when it receives an electric current or is excited, and the infrared heating layer can release heat primarily through thermal radiation.

[0079] The infrared heating layer can emit infrared rays with wavelengths of 0.75μm to 1000μm, such as far-infrared rays with wavelengths of 1.5μm to 400μm, or far-infrared rays with wavelengths of 8μm to 15μm.

[0080] In some embodiments, the first heating layer 113 is disposed on the inner side of the first base tube 112. In some embodiments, the first heating layer 113 is embedded in or embedded in the tube wall of the first base tube 112.

[0081] In some embodiments, the first base tube 112 is made of a material with a thermal conductivity greater than 10 W / (m·K). For example, the first base tube 112 includes a first metal tube, which, when made of stainless steel, has a thermal conductivity between 15 W / (m·K) and 30 W / (m·K). When the first metal tube is made of aluminum alloy, its thermal conductivity is between 155 W / (m·K) and 236 W / (m·K).

[0082] In some embodiments, reference may be made to Figure 5 The first heating layer 113 includes a planar heating layer. In some embodiments (not shown), the first heating layer 113 includes a trajectory heating layer. The planar heating layer is clearly distinguished from the trajectory heating layer, which is generally a narrow strip and may have at least one bend. The planar heating layer is generally planar or curved.

[0083] The first base tube 112 may have only one first heating layer 113. The first base tube 112 may have multiple first heating layers 114. The ratio of the total area of ​​the first heating layers 114 to the surface area of ​​one side of the first base tube 112 may be greater than or equal to 0.5. Preferably, the ratio of the area of ​​the first heating layer to the surface area of ​​one side of the first base tube may be greater than or equal to 0.7. More preferably, the ratio of the area of ​​the first heating layer 113 to the surface area of ​​one side of the first base tube 112 may be greater than or equal to 0.8.

[0084] The resistance value R1 of the first heating layer 113 can be between 0.35Ω and 1Ω, that is, 0.35Ω≤R1≤1Ω. Preferably, 0.45Ω≤R1≤0.8Ω.

[0085] The first heating tube 11 further comprises a first electrode layer 115 and a second electrode layer 116, and the first heating layer 113 is electrically connected with the first electrode layer 115 and the second electrode layer 116. The first electrode layer 115 and the second electrode layer 116 can be formed on the first base tube 112 or the first insulating layer 114 by printing, coating, chemical deposition, physical deposition, ion sputtering or particle injection. The first electrode layer 115 and the second electrode layer 116 can be formed before the first heating layer 113, so that parts of the first electrode layer 115 and the second electrode layer 116 are covered by the first heating layer 113. The first electrode layer 115 and the second electrode layer 116 can be formed after the first heating layer 113, so that parts of the first heating layer 113 are covered by the first electrode layer 115, parts of the first heating layer 113 are covered by the second electrode layer 116, and parts of the first heating layer 113 are located between the first electrode layer 115 and the second electrode layer 116.

[0086] The first electrode layer 115 and the second electrode layer 116 have a resistance value smaller than that of the first heating layer 113. The first electrode layer 115 and the second electrode layer 116 are used for welding with the wire 13 or for abutting with the conductive spring.

[0087] The second tubular body 12 can comprise a second base tube 122 and a second heating layer 123 arranged on the second base tube 122. The second base tube 122 is tubular, and the second accommodating cavity 121 is located in the second base tube 122.

[0088] In some embodiments, the second base tube 122 comprises a second insulating tube made of an insulating material. For example, the second insulating tube can be made of ceramic, including but not limited to alumina ceramic, aluminum nitride ceramic and silicon nitride ceramic. Or for example, the second insulating tube can be made of glass or quartz. The second insulating tube can be made of the same material as the first insulating tube.

[0089] In such embodiments, the second heating layer 123 can be formed on the surface of the second insulating tube by printing, coating, chemical deposition, physical deposition, ion sputtering or particle injection.

[0090] In some embodiments, the second base tube 122 comprises a tubular body made of conductive material. For example, the second base tube 122 comprises a second metal tube made of metal, including but not limited to aluminum, stainless steel and aluminum alloy. The second metal tube can be made of the same material as the first metal tube.

[0091] In such embodiments, the second heating tube 12 further comprises a second insulation layer 124 disposed on the second metal tube, and the second heating layer 123 is disposed on the second insulation layer 124, such that the second heating layer 123 is insulatedly connected with the second base tube 122. The second heating layer 123 can be formed on the second insulation layer 124 by printing, coating, chemical deposition, physical deposition, ion sputtering or particle injection.

[0092] The second insulation layer 124 can comprise a metal oxide formed by oxidation of the metal surface of the second metal tube. At least a portion of the second insulation layer 124 can be formed on the second metal tube by printing, coating, chemical deposition, physical deposition, ion sputtering or particle injection. The second insulation layer 124 can be made of the same material as the first insulation layer 114.

[0093] The wall thickness of the second metal tube can be between 0.05mm and 0.3mm. Preferably, the wall thickness of the second metal tube is between 0.1mm and 0.2mm. By making the second metal tube have a smaller thickness, the heat absorbed by the second metal tube from the second heating layer 123 can be reduced, which helps to reduce the loss of the second heating tube 12 and improve the efficiency of the second heating tube 12. The second metal tube can have the same wall thickness as the first metal tube.

[0094] In some embodiments, the second base tube 122 comprises a non-light-transmissive tubular body, and the second heating layer 123 is disposed corresponding to the non-light-transmissive tubular body and outside the non-light-transmissive tubular body. In such embodiments, the second heating layer 123 can comprise an electric resistance heating layer.

[0095] In some embodiments, the second base tube 122 comprises a light-transmissive tubular body, and the second heating layer 123 is disposed corresponding to the light-transmissive tubular body and outside the light-transmissive tubular body. In such embodiments, the second heating layer 123 can comprise an infrared heating layer.

[0096] In some embodiments, the second heating layer 123 is disposed inside the second base tube 122. In some embodiments, the second heating layer 123 is embedded in or embedded in the tube wall of the second base tube 122.

[0097] In some embodiments, the second base tube 122 is made of a material having a thermal conductivity greater than 10W / (m·K). The second base tube 122 can be made of the same material as the first base tube 112.

[0098] In some embodiments, the second heating layer 123 comprises a planar heating layer. In some embodiments, the second heating layer 123 comprises a track-shaped heating layer.

[0099] The second heating layer 123 can be arranged on the second base pipe 122 only. The second heating layer 123 can be arranged on the second base pipe 122 in multiple layers. The ratio of the total area of the second heating layer 123 to the single-side surface area of the second base pipe 122 can be greater than or equal to 0.5. Preferably, the ratio of the area of the second heating layer 123 to the single-side surface area of the second base pipe 122 can be greater than or equal to 0.7. More preferably, the ratio of the area of the second heating layer 123 to the single-side surface area of the second base pipe 122 can be greater than or equal to 0.8.

[0100] The resistance value R2 of the second heating layer 123 can be between 0.35Ω and 1Ω, i.e. 0.35Ω≤R2≤1Ω. Preferably, 0.45Ω≤R2≤0.8Ω. The resistance value R1 of the first heating layer 113 can be substantially equal to the resistance value R2 of the second heating layer 123.

[0101] The second heating pipe 12 further comprises a third electrode layer 125 and a fourth electrode layer 126, and the second heating layer 123 is electrically connected to the third electrode layer 125 and the fourth electrode layer 126. The third electrode layer 125 and the fourth electrode layer 126 can be formed on the second base pipe 122 or the second insulating layer 124 by printing, coating, chemical deposition, physical deposition, ion sputtering or particle injection. The third electrode layer 125 and the fourth electrode layer 126 can be formed before the second heating layer 123, so that part of the third electrode layer 125 and part of the fourth electrode layer 126 are covered by the second heating layer 123. The third electrode layer 125 and the fourth electrode layer 126 can be formed after the second heating layer 123, so that part of the second heating layer 123 is covered by the third electrode layer 125, part of the second heating layer 123 is covered by the fourth electrode layer 126, and part of the second heating layer 123 is located between the third electrode layer 125 and the fourth electrode layer 126.

[0102] The resistance value of the third electrode layer 125 and the fourth electrode layer 126 is less than the resistance value of the second heating layer 123. The third electrode layer 125 and the fourth electrode layer 126 are used for welding with the wire 13 or for abutting against the conductive spring.

[0103] The first heating pipe 11 and the second heating pipe 12 are two independent heating pipes. Whether the first heating pipe 11 and the second heating pipe 12 are in direct contact or the first heating pipe 11 and the second heating pipe 12 are spaced apart from each other, there will be a large thermal resistance between the first heating pipe 11 and the second heating pipe 12, so as to reduce the heat interference between the first heating pipe 11 and the second heating pipe 12.

[0104] In some embodiments, the heating assembly 1 can further comprise a connecting member 14, and the connecting member 14 connects the first heating pipe 11 and the second heating pipe 12. Figures 2-4

[0105] ​The connecting piece 14 comprises a thermal insulation material with a thermal conductivity less than 5 W / (m·K). The thermal insulation material can include, but is not limited to, quartz, zirconia, and other low-thermal-conductivity ceramics. The thermal insulation material can include, but is not limited to, high-temperature-resistant polymer materials, including but not limited to PBI, PI, or PEEK, and the like.

[0106] Therefore, when the connecting piece 14 is connected with the first heating pipe 11 and the second heating pipe 12, the heat absorbed by the connecting piece from the first heating pipe 11 and the second heating pipe 12 can be reduced, thereby reducing the energy consumption of the heating assembly 1.

[0107] In some embodiments, the first heating pipe 11 and the second heating pipe 12 can be arranged in a ring shape. Figure 4 There is a gap between the distal end of the first heating pipe 11 and the proximal end of the second heating pipe 12. By providing the gap, the thermal resistance between the first heating pipe 11 and the second heating pipe 12 is further increased, thereby reducing the heat cross-talk between the first heating pipe 11 and the second heating pipe 12.

[0108] In some embodiments, the first heating pipe 11 and the second heating pipe 12 can be arranged in a ring shape. Figure 3 The connecting piece 14 comprises a positioning portion 141, at least a part of the positioning portion 141 is located in the gap between the distal end of the first heating pipe 11 and the proximal end of the second heating pipe 12.

[0109] As a typical example, there is an annular gap between the distal end of the first heating pipe 11 and the proximal end of the second heating pipe 12, so that the first heating pipe 11 and the second heating pipe 12 are spaced apart, and the first heating pipe 11 and the second heating pipe 12 are thus in contact, so that the first heating pipe 11 and the second heating pipe 12 have a large thermal resistance therebetween.

[0110] Further, the positioning portion 141 is configured in an annular shape. The annular positioning portion 141 can be sealingly connected with the first heating pipe 11 and sealingly connected with the second heating pipe 12, so that the positioning portion 141 can prevent aerosol from leaking through the gap.

[0111] Alternatively, the positioning portion 141 has a plurality of positioning portions 141 arranged in a ring shape, and adjacent two positioning portions 141 are arranged in a transverse direction.

[0112] In other examples, not shown, the distal end of the first heating pipe and the proximal end of the second heating pipe are in contact with each other, and there are a plurality of gaps between the distal end of the first heating pipe and the proximal end of the second heating pipe, and the plurality of gaps are discretely distributed and arranged in a ring shape. For example, the distal end of the first heating pipe or the proximal end of the second heating pipe is configured in a zigzag shape. Therefore, the gap between the distal end of the first heating pipe and the proximal end of the second heating pipe can reduce the contact area between the distal end of the first heating pipe and the proximal end of the second heating pipe, thereby increasing the thermal resistance between the first heating pipe and the second heating pipe.

[0113] The heating temperature of the region on the aerosol generating article 2 corresponding to the gap is lower than the heating temperature of the region on the aerosol generating article 2 corresponding to the heating tube.

[0114] The gap between the distal end of the first heating tube 11 and the proximal end of the second heating tube 12 has a dimension D2 in the longitudinal direction.

[0115] Obviously, the greater D2 is, the greater the thermal resistance between the first heating tube 11 and the second heating tube 12 is, but the greater D2 is, the greater the size of the heating assembly 1 is and the greater the size of the aerosol generating device 100 is. When the first heating tube 11 and the second heating tube 12 are used to heat different sections of the same aerosol generating article 2 respectively, the greater D2 is, the greater the region on the aerosol generating article 2 corresponding to the gap is, which is likely to cause large temperature difference and uneven heating of the aerosol generating article 2. When the first heating tube 11 and the second heating tube 12 are used to heat different aerosol generating articles 2 respectively, the greater D2 is, the lower the temperature of the aerosol generated by the aerosol generating article in the second accommodating cavity 121 is when entering the aerosol generating article in the first accommodating cavity 111, which is not conducive to improving the heating effect of the first heating tube 11 on the aerosol generating article in the first accommodating cavity 111.

[0116] Therefore, in some embodiments of the present application, D2 satisfies: 0.1mm≤D2≤1mm. Preferably, D2 satisfies: 0.1mm≤D2≤0.5mm. Or preferably, D2 satisfies: 0.3mm≤D2≤0.5mm.

[0117] In some embodiments, the connection piece 14 can be connected to the first heating tube 11 in a manner as shown in Figure 3 The connection piece 14 further comprises a surrounding portion 142, and the positioning portion 141 is located inside the surrounding portion 142. At least a part of the first heating tube 11 is located in the surrounding portion and abuts against the inner wall of the surrounding portion 142. Thus, the positioning portion 141 can support the first heating tube 11 in the longitudinal direction.

[0118] The first heating tube 11 and the connection piece 14 can be connected in an assembled manner. That is, the first heating tube 11 and the connection piece 14 can be manufactured respectively, and then the first heating tube 11 and the connection piece 14 are connected to each other. The positioning portion 141 is used to position the position of the distal end of the first heating tube 11 in the surrounding portion 142.

[0119] For example, the first heating pipe 11 can be at least partially embedded in the surrounding portion 142 by means of riveting. High-temperature glue can be provided between the first heating pipe 11 and the surrounding portion 142, which can not only increase the connection stability between the first heating pipe 11 and the surrounding portion 142, but also increase the connection sealing between the first heating pipe 11 and the surrounding portion 142, so as to prevent aerosol from leaking through the gap between the first heating pipe 11 and the surrounding portion 142.

[0120] The first heating pipe 11 and the connecting piece 14 can be connected by insert molding.

[0121] For example, the first heating pipe 11 can be placed in a mold, and then a fluid connecting piece forming material is injected into the mold. After the connecting piece forming material is solidified, the connecting piece 14 and the first heating pipe 11 form an integrated product in connection.

[0122] In some embodiments, referring to Figure 3 , at least a portion of the second heating pipe 12 is located in the surrounding portion 142 and abuts the inner wall of the surrounding portion 142. Thus, the positioning portion 142 can abut the second heating pipe 12 in the longitudinal direction.

[0123] The second heating pipe 12 and the connecting piece 14 can be assembled and connected. That is, the second heating pipe 12 and the connecting piece 14 can be manufactured separately, and then connected to each other. The positioning portion 141 is used to position the position of the proximal end of the second heating pipe 11 in the surrounding portion 142.

[0124] The second heating pipe 12 and the connecting piece 14 can be assembled and connected. That is, the second heating pipe 12 and the connecting piece 14 can be manufactured separately, and then connected to each other. The positioning portion 141 is used to position the position of the proximal end of the second heating pipe 11 in the surrounding portion 142.

[0125] The second heating pipe 12 and the connecting piece 14 can be connected by insert molding.

[0126] The positioning portion 141 has a dimension D1 in the transverse direction.

[0127] In some embodiments, referring to Figure 1 and Figure 3 , the first accommodating cavity 111 and the second accommodating cavity 121 are used to accommodate different sections of the same aerosol generating article 2, and the dimension D1 of the positioning portion 141 in the transverse direction is less than or equal to the wall thickness of the first heating pipe 11. Thus, at least a portion of the aerosol generating article 2 can pass through the first accommodating cavity 111 more smoothly, and then be inserted into the second accommodating cavity 121.

[0128] The positioning part 141 can have a lateral dimension D1 that is less than or equal to the wall thickness of the second heating tube 12. This allows at least a portion of the aerosol-generating article 2 to be smoothly retracted from the second receiving cavity 121 into the first receiving cavity 111, and then the aerosol-generating article 2 is removed from the heating assembly 1.

[0129] In some embodiments, reference may be made to Figure 3 The lateral dimension D1 of the positioning part is less than or equal to the wall thickness of the surrounding part 142. The wall thickness of the first heating tube 11 can also be less than or equal to the wall thickness of the surrounding part 142. The wall thickness of the second heating tube 12 can also be less than or equal to the wall thickness of the surrounding part 142.

[0130] In some embodiments, the lateral dimension D1 of the positioning part satisfies: 0.1mm ≤ D1 ≤ 0.5mm. Preferably, 0.1mm ≤ D1 ≤ 0.3mm.

[0131] In some embodiments, reference may be made to Figure 2 At least a portion of the first electrode layer 115 and at least a portion of the second electrode layer 116 are exposed outside the surrounding portion 142, thereby enabling the first electrode layer 115 and the second electrode layer 116 to be electrically connected to the corresponding wire 13 or conductive spring.

[0132] In some embodiments, reference may be made to Figure 2 At least a portion of the third electrode layer 125 and at least a portion of the fourth electrode layer 126 are exposed outside the surrounding portion 142, thereby enabling the third electrode layer 125 and the fourth electrode layer 126 to be electrically connected to the corresponding wire 13 or conductive spring.

[0133] In some embodiments, reference may be made to Figure 4 The longitudinal extension length of the first heating tube 11 is less than or equal to the longitudinal extension length of the second heating tube 12.

[0134] When the first heating tube 11 and the second heating tube 12 heat different sections of the same aerosol generating product 2 respectively: the heating area of ​​the first heating tube 11 on the aerosol generating product 2 is less than or equal to the heating area of ​​the second heating tube 12 on the aerosol generating product 2; or, the longitudinal length of the first heating tube 11 heating the aerosol generating product 2 is less than or equal to the longitudinal length of the second heating tube 12 heating the aerosol generating product 2.

[0135] In some embodiments, the aerosol generating article 2 or the aerosol generating device 100 includes a mouthpiece 22 that is to be held by a user's mouth, and the user sucks the aerosol by sucking the mouthpiece 22. The mouthpiece 22 is located downstream of the aerosol generating substrate 21 in the direction of the airflow. When the aerosol generating article 2 is coupled to the aerosol generating device 100, a portion of the aerosol generating substrate 21 is located in the first accommodation cavity 111, and a portion of the aerosol generating substrate 21 is located in the second accommodation cavity 121. The proximal end of the first heating tube 11 can be disposed toward the mouthpiece 22.

[0136] The portion of the aerosol generating substrate 21 located in the first accommodation cavity 111 is defined as a first portion, the portion of the aerosol generating substrate 21 located in the second accommodation cavity 121 is defined as a second portion, and the portion of the aerosol generating substrate 21 located between the first accommodation cavity 111 and the second accommodation cavity 121 is defined as a third portion if the first heating tube 11 and the second heating tube 12 are spaced apart in the longitudinal direction. The longitudinal length of the first portion is less than or equal to the longitudinal length of the second portion.

[0137] In some embodiments, the aerosol generating substrate 21 is composed of the first portion, the second portion, and the third portion, or the aerosol generating substrate 21 is composed of the first portion and the second portion.

[0138] In some embodiments, the aerosol generating substrate 21 further includes a fourth portion located downstream of the first portion, and the aerosol generating substrate 21 further includes a fifth portion, and the second portion is located downstream of the fifth portion.

[0139] In some embodiments, the manufacturing steps of the heating assembly 1 can include: (1) obtaining a first insulating tube and a second insulating tube; (2) disposing a first heating layer, a first electrode layer, and a second electrode layer on the first insulating tube, the first electrode layer and the second electrode layer being electrically connected to the first heating layer, thereby forming the first heating tube; (3) disposing a second heating layer, a third electrode layer, and a fourth electrode layer on the second insulating tube, the third electrode layer and the fourth electrode layer being electrically connected to the second heating layer, thereby forming the second heating tube; and (4) connecting the first heating tube and the second heating tube by the connector. The order of steps (2) and (3) is not limited.

[0140] In some embodiments, the manufacturing steps of the heating component 1 may include: (1) obtaining a first metal tube and a second metal tube; (2) providing a first insulating layer on the first metal tube, providing a first heating layer, a first electrode layer and a second electrode layer on the first insulating layer, the first electrode layer and the second electrode layer being electrically connected to the first heating layer, thereby forming a first heating tube; (3) providing a second insulating layer on the second metal tube, providing a second heating layer, a third electrode layer and a fourth electrode layer on the second insulating layer, the third electrode layer and the fourth electrode layer being electrically connected to the second heating layer, thereby forming a second heating tube; (4) connecting the first heating tube and the second heating tube with a connector. The order of steps (2) and (3) is not important.

[0141] In some embodiments, the manufacturing steps of the heating component 1 may include: (1) arranging multiple heating layers longitudinally on the same long insulating tube, with any two heating layers spaced apart, and arranging multiple electrode layers, each heating layer being electrically connected to at least two electrode layers; (2) cutting the insulating tube located between two adjacent heating layers, with the cutting position located outside any one of the heating layers, thereby obtaining multiple heating tubes with shorter lengths; (3) connecting two of the heating tubes with a connector, such that the two heating tubes are arranged longitudinally and share a central axis.

[0142] In some embodiments, the manufacturing steps of the heating assembly may include: (1) arranging multiple insulating layers longitudinally on the same long metal tube, with any two insulating layers spaced apart; (2) providing a heating layer and two electrode layers on each insulating layer, with the two electrode layers on the same insulating layer being electrically connected to the heating layer on the insulating layer; (3) cutting the metal tube located between two adjacent insulating layers, with the cutting position located outside any one of the insulating layers, thereby obtaining multiple heating tubes of shorter length; (4) connecting two of the heating tubes with a connector, so that the two heating tubes are arranged longitudinally and share a central axis.

[0143] In some embodiments, the power supply 31 is configured to independently provide electrical power to the first heating layer 113 and the second heating layer 123, and the operating phase of the heating assembly 1 includes a first phase and a second phase. The first heating layer 113 is configured to generate heat in the first phase, and the second heating layer 123 is configured to generate heat in the second phase.

[0144] Because there is a large thermal resistance between the first heating tube 11 and the second heating tube 12, the heat crosstalk between the first heating tube 11 and the second heating tube 12 is small. Therefore, when the first heating layer 113 is heated and the second heating layer 123 is not heated, the first heating tube 11 has a higher temperature and the second heating tube 12 has a lower temperature.

[0145] Please refer to Figure 6, along the longitudinal direction, the heating assembly 1 has, in sequence, a first position A1, a second position A2, a third position A3, a fourth position A4, a fifth position A5, a sixth position A6 and a seventh position A7. The first position A1 to the third position A3 correspond to the second portion of the aerosol-forming substrate 21, and the second position A2 corresponds to the middle position of the second portion in the longitudinal direction; the fifth position A5 to the seventh position A7 correspond to the first portion of the aerosol-forming substrate 21, and the sixth position A6 corresponds to the middle position of the first portion in the longitudinal direction; and the fourth position A4 corresponds to the third portion of the aerosol-forming substrate 21. The third position A3 of the second portion and the fifth position A5 of the first portion are separated by the fourth position A4.

[0146] When the first heating layer 113 generates heat and the first heating tube 11 reaches a stable temperature, and the second heating layer 123 does not generate heat, the thermal resistance between the first heating tube 11 and the second heating tube 12 can cause the average temperature of the first position A1 to the third position A3 to be 90-105°C lower than the average temperature of the fifth position A5 to the seventh position A7. In the second example aerosol-generating device provided in the “BACKGROUND” section, the average temperature of the second heating zone is only 45-75°C lower than the average temperature of the first heating zone.

[0147] When the first heating layer 113 generates heat and the first heating tube 11 reaches a stable temperature, and the second heating layer 123 does not generate heat, the thermal resistance between the first heating tube 11 and the second heating tube 12 can cause the temperature of the third position A3 of the second portion to be more than 50°C lower than the temperature of the fifth position A5 of the first portion, for example, 85-90°C lower.

[0148] In some embodiments, in the first stage, the average temperature of the first heating tube 11 is greater than the average temperature of the second heating tube 12; and in the second stage, the average temperature of the first heating tube 11 is less than or equal to the average temperature of the second heating tube 12.

[0149] In some embodiments, the first heating layer 113 is configured to continue to generate heat in the second stage. Therefore, in the second stage, both the first heating layer 113 and the second heating layer 123 generate heat.

[0150] Releasing heat from the first heating tube 11 before the second heating tube 12 can cause the first portion located downstream to reach the aerosol generation temperature before the second portion, which is beneficial for enabling the user to draw the first puff of aerosol more quickly. The mutual independence of the first heating tube 11 and the second heating tube 12 can prevent a large amount of heat from being transferred from the first heating tube 11 to the second heating tube 12 when the first heating tube 11 is working and the second heating tube 12 is not working, thereby causing the second portion to be heated but not sufficiently, resulting in a large amount of impurities being generated in the second portion and affecting the taste of the puff.

[0151] In some embodiments, the average temperature of the first heating tube 11 in the first stage is greater than or equal to the average temperature of the first heating tube 11 in the second stage. Alternatively, the electrical power provided by the power source 31 to the first heating tube 11 in the first stage is greater than or equal to the electrical power provided by the power source 31 to the first heating tube 11 in the second stage. This prevents the first portion from being over-baked in the second stage.

[0152] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. In a claim, the word "a" or "an" preceding the commencement of a list of one or more elements is intended to denote "one or more" and therefore does not exclude the presence of at least one additional element. In a claim, the words "consisting of mean "exactly comprising the elements listed in the claim." The term "about" in relation to a numerical value denotes +1 / 10 of the value.

Claims

1. A heating assembly, characterized by, Comprise: a first heating tube extending in a longitudinal direction, having a first accommodating cavity inside for accommodating a portion of an aerosol generating article, the first heating tube comprising a first base tube, a first heating layer arranged on the first base tube, the first heating tube being configured to release heat to heat the aerosol generating article located in the first accommodating cavity; a second heating tube extending in a longitudinal direction, having a second accommodating cavity inside for accommodating a portion of an aerosol generating article, the second heating tube comprising a second base tube, a second heating layer arranged on the first base tube, the second heating tube being configured to release heat to heat the aerosol generating article located in the second accommodating cavity; and a connector connecting the first heating tube and the second heating tube; wherein the first accommodating cavity and the second accommodating cavity are in communication with each other. The first base tube comprises a first metal tube, the first heating tube further comprises a first insulating layer arranged on the first metal tube, and the first heating layer is arranged on the first insulating layer; and / or 2. The heating assembly of claim 1, wherein, The second base tube comprises a second metal tube, the second heating tube further comprises a second insulating layer arranged on the second metal tube, and the second heating layer is arranged on the second insulating layer. The first heating tube has a gap between a distal end of the first heating tube and a proximal end of the second heating tube.

3. The heating assembly of claim 2, wherein, The connector comprises a positioning portion, at least a portion of the positioning portion is located in the gap between the distal end of the first heating tube and the proximal end of the second heating tube.

4. The heating assembly of claim 3, wherein, The connector further comprises a surrounding portion, the positioning portion is located inside the surrounding portion; 5. The heating assembly of claim 4, wherein, At least a portion of the first heating tube is located in the surrounding portion and is arranged close to an inner wall of the surrounding portion; and / or At least a portion of the second heating tube is located in the surrounding portion and is arranged close to the inner wall of the surrounding portion. The first heating tube further comprises a first electrode layer and a second electrode layer electrically connected to the first heating layer, at least a portion of the first electrode layer and at least a portion of the second electrode layer are exposed outside the surrounding portion; and / or 6. The heating assembly of claim 5, wherein, The second heating tube further comprises a third electrode layer and a fourth electrode layer electrically connected to the second heating layer, at least a portion of the third electrode layer and at least a portion of the fourth electrode layer are exposed outside the surrounding portion. A dimension D1 of the positioning portion in a transverse direction satisfies at least one of the following conditions: 0.1mm≤D1≤0.5mm; 7. The heating assembly of claim 5, wherein, D1 is less than or equal to a wall thickness of the surrounding portion; and D1 is less than or equal to a wall thickness of the first heating tube and / or the second heating tube. A dimension D2 of the gap between the distal end of the first heating tube and the proximal end of the second heating tube in a longitudinal direction satisfies: 0.1mm≤D2≤1mm. The first heating tube and the second heating tube are spaced apart by an annular gap between the distal end of the first heating tube and the proximal end of the second heating tube; or 8. The heating assembly of claim 3, wherein, The distal end of the first heating tube and the proximal end of the second heating tube are in contact with each other, and a plurality of gaps are provided between the distal end of the first heating tube and the proximal end of the second heating tube, the plurality of gaps are discretely distributed and arranged in an annular manner.

9. The heating assembly of claim 3, wherein, ​ ​ 10. The heating assembly of claim 1, wherein, The first heating tube is assembledly connected with the connecting piece, or the first heating tube is connected with the connecting piece in a way of insert molding; and / or The second heating tube is assembledly connected with the connecting piece, or the second heating tube is connected with the connecting piece in a way of insert molding.

11. The heating assembly of any one of claims 1-10, wherein, The connecting piece comprises a heat insulation material, and the heat conductivity of the heat insulation material is less than 5 W / (m·K).

12. The heating assembly of any one of claims 1-10, wherein, The wall thickness of the first base tube is between 0.05 mm and 0.3 mm; and / or The wall thickness of the second base tube is between 0.05 mm and 0.3 mm.

13. The heating assembly of any one of claims 1-10, wherein, The extension length of the first heating tube in the longitudinal direction is less than or equal to the extension length of the second heating tube in the longitudinal direction; and / or The first heating tube and the second heating tube have the same inner diameter.

14. The heating assembly of any one of claims 1-10, wherein, The resistance value of the first heating layer is between 0.35 Ω and 1 Ω; and / or The resistance value of the second heating layer is between 0.35 Ω and 1 Ω.

15. An aerosol-generating device comprising: The heating assembly comprises the first base tube, the second base tube, the connecting piece, the first heating layer and the second heating layer, and further comprises a power supply configured to be capable of independently providing the first heating layer and the second heating layer with electric power; the working stage of the heating assembly comprises a first stage and a second stage, the first heating layer is configured to generate heat in the first stage, and the second heating layer is configured to generate heat in the second stage.

16. The aerosol-generating device of claim 15, wherein, The first heating layer is configured to generate heat in the second stage.

Images