Heating device, atomization assembly and aerosol generating device

Abstract

The invention relates to a heating device, an atomization assembly and an aerosol generating device. The heating device comprises a first base body layer and a second base body layer which are oppositely arranged, a cavity is formed between the first base body layer and the second base body layer, and the cavity is provided with an air inlet end communicated with external air and an air outlet end communicated with an aerosol generating medium. The heating device further comprises a heat-conducting medium which is arranged in the cavity and can allow airflow to pass through. The atomization assembly comprises a heating device. The aerosol generating device comprises a shell and an atomization assembly arranged in the shell. Air is fed in the cavity formed between the first substrate layer and the second substrate layer, the stability of the air feeding structure can be guaranteed, in addition, heat can be rapidly conducted to all positions of the first substrate layer and the second substrate layer in the process that air flows through the heat-conducting medium, the heat can be evenly distributed in the heating device, and the heating effect is improved. Therefore, the aerosol generating medium can be uniformly heated.

Description

Technical Field

[0001] The present invention relates to the field of atomization technology, and more specifically, to a heating device, an atomization assembly and an aerosol generating device. Background Art

[0002] For heat-not-burn aerosol generating devices, they generally use heating devices in the form of heating pots, heating tubes or heating plates to heat the aerosol generating medium to release the aerosol extract in the aerosol generating medium without burning. The working temperature of the heating device is usually 180℃~350℃.

[0003] During the heating process, since the high-temperature heating device is in contact with the low-temperature aerosol generating medium, it is difficult to maintain a uniform temperature of the heating device, resulting in uneven heating of the heated aerosol generating medium.

[0004] In addition, in the related art, for heating devices that use a heating pot or a heating tube for heating, the aerosol generating medium is at least partially contained in the heating device, and the aerosol generating device generally adopts an air intake method in which air enters through the gap between the inner wall surface of the heating device and the outer wall surface of the aerosol generating medium, or air directly enters the aerosol generating medium from the bottom. For heating devices that use a heating plate inserted into the aerosol generating medium for heating, the aerosol generating device generally adopts an air intake method in which air directly enters the aerosol generating medium from the bottom. If there is a dimensional tolerance between the heating device and the aerosol generating medium, the suction resistance of the air intake will be affected, and there is a problem of unstable air intake structure. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a heating device with a stable air intake structure and capable of uniform heating, and an atomization assembly and an aerosol generating device having the heating device in view of the above-mentioned defects of the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is: construct a heating device, comprising a first substrate layer and a second substrate layer arranged opposite to each other, a cavity is formed between the first substrate layer and the second substrate layer, and the cavity has an air inlet end connected to the external air and an air outlet end connected to the aerosol generating medium;

[0007] The heating device also includes a heat-conducting medium which is arranged in the cavity and through which airflow can pass.

[0008] In some embodiments, the thermally conductive medium includes one or more of a porous structure, a wire mesh, or a groove structure.

[0009] In some embodiments, the first substrate layer is tubular and has an atomization cavity formed therein for accommodating the aerosol generating medium, and the second substrate layer is tubular and is sleeved outside the first substrate layer.

[0010] In some embodiments, the atomization chamber has a first end for inserting the aerosol generating medium and a second end opposite to the first end, the air outlet end of the cavity is connected to the second end, and the air inlet end of the cavity is connected to the first end.

[0011] In some embodiments, both end surfaces of the first base layer are respectively recessed to form at least one air inlet connecting the air inlet end of the cavity with the first end and at least one air outlet connecting the air outlet end of the cavity with the second end.

[0012] In some embodiments, the at least one air inlet includes a plurality of the air inlets evenly spaced apart in the circumferential direction of the first base layer, and the at least one air outlet includes a plurality of the air outlets evenly spaced apart in the circumferential direction of the first base layer.

[0013] In some embodiments, the heating device is in the form of a sheet.

[0014] In some embodiments, the heating device further comprises a heating element disposed on a surface of the first substrate layer and / or the second substrate layer.

[0015] The present invention also provides an atomization assembly, comprising the heating device as described above.

[0016] The present invention also provides an aerosol generating device, comprising a shell and an atomizing component arranged in the shell.

[0017] The implementation of the present invention has at least the following beneficial effects: the present invention ensures the stability of the air intake structure by taking in air through the cavity formed between the first substrate layer and the second substrate layer; in addition, when the air flows through the heat-conducting medium, the heat can be quickly transferred to various parts of the first substrate layer and the second substrate layer, which is beneficial to the uniform distribution of heat in the heating device, thereby facilitating the uniform heating of the aerosol generating medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of an aerosol generating system in some embodiments of the present invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of the longitudinal cross-sectional structure of the aerosol generating system shown;

[0021] Figure 3 yes Figure 2 A schematic diagram of the longitudinal cross-section structure of the atomization component;

[0022] Figure 4 yes Figure 3 A schematic diagram of the exploded structure of the atomization assembly shown;

[0023] Figure 5 is a schematic diagram of the three-dimensional structure of a heat-conducting medium in a modified embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the longitudinal cross-sectional structure of an atomizing assembly in a modified embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of a heating device in a modified embodiment of the present invention;

[0026] Figure 8 yes Figure 7 A schematic diagram of the longitudinal cross-sectional structure of the heating device shown. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings or the orientations or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Figure 1-2 An aerosol generating system 1 in some embodiments of the present invention is shown, which includes an aerosol generating device 100 and an aerosol generating medium 200 at least partially contained in the aerosol generating device 100. The aerosol generating device 100 is used to generate heat after being powered on to heat the aerosol generating medium 200 contained therein, and release the aerosol extract in the aerosol generating medium 200 in a non-combustion state.

[0033] The aerosol generating medium 200 includes a solid smoking substrate for generating aerosol after being heated, and the solid smoking substrate may include one or more of filaments, sheets, particles, powders, pastes, etc. In this embodiment, the aerosol generating medium 200 is cylindrical and can be at least partially inserted into the aerosol generating device 100. Of course, in other embodiments, the aerosol generating medium 200 is not limited to being cylindrical, and it can also be in other cylindrical shapes such as an elliptical column or a racetrack column.

[0034] The aerosol generating device 100 may include a housing 10, an atomizing assembly 20, a battery 30 and a circuit board 40, wherein the atomizing assembly 20, the battery 30 and the circuit board 40 are all accommodated in the housing 10. A socket 11 is formed on the top wall of the housing 10, and the lower part of the aerosol generating medium 200 can be inserted into the housing 10 through the socket 11 for atomization, and the upper part of the aerosol generating medium 200 can be exposed outside the socket 11 for the user to inhale. The circuit board 40 is electrically connected to the atomizing assembly 20 and the battery 30 respectively, and a related control circuit is arranged thereon, which is used to control the power on and off of the atomizing assembly 20 by the battery 30, and can also be used to control the power provided by the battery 30 to the atomizing assembly 20.

[0035] like Figure 2-4 As shown, the atomization assembly 20 includes a heating device 21. In this embodiment, the heating device 21 is in the shape of a round tube with two ends open, and an atomization chamber 2110 for accommodating the aerosol generating medium 200 is formed therein. The atomization chamber 2110 has a first end 2111 and a second end 2112 opposite to each other in the axial direction. The first end 2111 is close to the socket 11 and is used for inserting the aerosol generating medium 200. Of course, in other embodiments, the heating device 21 is not limited to being in the shape of a round tube, and it can also be in other shapes such as an elliptical tube, a racetrack tube, a square tube, etc.

[0036] In some embodiments, the heating device 21 may include a tubular first base layer 211, a tubular second base layer 213 sleeved outside the first base layer 211, and a heat-conducting medium 212 disposed between the first base layer 211 and the second base layer 213. The inner wall surface of the first base layer 211 defines an atomization chamber 2110. The second base layer 213 is sleeved outside the first base layer 211 and may be coaxially disposed with the first base layer 211. The inner wall surface of the second base layer 213 is spaced from the outer wall surface of the first base layer 211. Specifically, in the present embodiment, the inner diameter of the second base layer 213 is greater than the outer diameter of the first base layer 211, so that an annular cavity 2130 is formed between the inner wall surface of the second base layer 213 and the outer wall surface of the first base layer 211.

[0037] The cavity 2130 has an air inlet and an air outlet, wherein the air inlet is connected to the outside air, and the air outlet is connected to the aerosol generating medium 200. The heat-conducting medium 212 is disposed in the cavity 2130, and the airflow entering from the air inlet of the cavity 2130 can flow through the heat-conducting medium 212 and further flow into the aerosol generating medium 200. In addition, when the air flows through the heat-conducting medium 212, the heat can be quickly transferred to the first substrate layer 211 and the second substrate layer 213, which is beneficial to the uniform distribution of heat in the heating device 21. In some embodiments, the thermal conductivity of the heat-conducting medium 212 can be greater than the thermal conductivity of the first substrate layer 211 and the second substrate layer 213, which is more beneficial to the rapid and uniform transfer of heat to the first substrate layer 211 and the second substrate layer 213. In some embodiments, the thermal conductivity of the heat-conducting medium 212 is greater than or equal to 150 W / mK, preferably, greater than or equal to 300 W / mK.

[0038] The first base layer 211 and the second base layer 213 can be made of metal (such as aluminum or stainless steel, etc.) or non-metal (such as ceramic or quartz glass, etc.) materials. In addition, the first base layer 211 and the second base layer 213 can be made of the same material or different materials. The thermal conductive medium 212 may include one or more of a porous structure (including but not limited to powder and / or particles), a wire mesh or a groove structure. When powder is filled between the second base layer 213 and the first base layer 211, the powder needs to be sintered and fixed. For example, the thermal conductive medium 212 can be a copper mesh formed by processes such as mechanical processing or laser processing, or it can also be sintered from copper powder.

[0039] In this embodiment, the heat conducting medium 212 may extend from the air inlet end to the air outlet end of the cavity 2130. Of course, in other embodiments, the heat conducting medium 212 may be disposed only partially in the cavity 2130, for example, the heat conducting medium 212 may be disposed in the portion of the cavity 2130 that overlaps with the solid smoking substrate in the axial direction.

[0040] Further, in the present embodiment, the two ends of the cavity 2130 are respectively connected to the two ends of the atomizing chamber 2110. Specifically, the air inlet end of the cavity 2130 is connected to the first end 2111 of the atomizing chamber 2110, and the air outlet end of the cavity 2130 is connected to the second end 2112 of the atomizing chamber 2110. The external airflow can flow into the air inlet end of the cavity 2130 through the first end 2111 of the atomizing chamber 2110, flow to the air outlet end of the cavity 2130 through the heat-conducting medium 212 and further flow out to the second end 2112 of the atomizing chamber 2110, and then enter the aerosol generating medium 200 contained in the atomizing chamber 2110 from the bottom. On the one hand, the air intake through the heat-conducting medium 212 can ensure the stability of the air intake structure, and will not affect the inhalation resistance due to the poor size consistency of the aerosol generating medium 200. On the other hand, the air can also be preheated when it flows through the heat-conducting medium 212. The preheated hot air then enters the aerosol generating medium 200, which can achieve a better heating and atomization effect than cold air. According to measurements, after being preheated by the heat-conducting medium 212, the temperature at the bottom of the aerosol generating medium 200 can be increased by 50°C.

[0041] In some embodiments, the end surfaces of both ends of the first substrate layer 211 may also be respectively recessed to form at least one air inlet 2113 and at least one air outlet 2114, the air inlet end of the cavity 2130 is communicated with the first end 2111 of the atomizing chamber 2110 through at least one air inlet 2113, and the air outlet end of the cavity 2130 is communicated with the second end 2112 of the atomizing chamber 2110 through at least one air outlet 2114. Preferably, there are multiple air inlets 2113 and they can be evenly spaced and distributed in the circumference of the first substrate layer 211, and there are also multiple air outlets 2114 and they can be evenly spaced and distributed in the circumference of the first substrate layer 211, which is conducive to uniform passage of airflow. It can be understood that in other embodiments, the air intake and / or outlet of the heat-conducting medium 212 can also be achieved by punching holes at positions close to the upper end surface and / or the lower end surface on the side wall of the first substrate layer 211.

[0042] It can be understood that in other embodiments, the air inlet end of the cavity 2130 may not be connected to the atomization chamber 2110. For example, an air inlet for allowing external air to enter the air inlet end of the cavity 2130 may be provided on the second base layer 213, or external air may directly enter the air inlet end of the cavity 2130 from above.

[0043] In some embodiments, the atomizer assembly 20 may further include a base 22 disposed at the lower end of the heating device 21 (the end away from the socket 11) and shielding the lower end opening of the heating device 21. The base 22 includes a base body 221, and the lower end surfaces of the first substrate layer 211 and the second substrate layer 213 may abut against the upper end surface of the base 22, thereby sealing and blocking the lower end of the cavity 2130 and the lower end of the atomization cavity 2110.

[0044] In some embodiments, the base 22 may further include a sleeve portion 223 extending upward from the outer circumference of the base body 221. The sleeve portion 223 is annular and sleeved on the lower end of the heating device 21. On the one hand, the installation and positioning between the heating device 21 and the base 22 can be achieved by sleeve connection. On the other hand, the sealing effect of the cavity 2130 and the atomization cavity 2110 can be further improved. The base 22 can be made of elastic materials such as silicone, which is conducive to improving the sealing performance. Of course, in other embodiments, the base 22 can also be made of other materials such as plastic.

[0045] In some embodiments, the base 22 may further include a boss 222 protruding from the base body 221 into the atomizing chamber 2110. When the aerosol generating medium 200 is installed in the atomizing chamber 2110, the bottom surface of the aerosol generating medium 200 may be against the boss 222, and the gap between the bottom surface of the aerosol generating medium 200 and the top surface of the base body 221 forms an airflow channel 220 for airflow. The airflow flowing out of the air outlet 2114 first flows into the airflow channel 220, and then enters the aerosol generating medium 200 from the bottom of the aerosol generating medium 200.

[0046] In some embodiments, a protective film may be further provided on the inner wall surface of the first substrate layer 211. When the first substrate layer 211 is metal, the protective film may prevent the metal surface of the first substrate layer 211 from directly contacting the aerosol generating medium 200, thereby preventing the first substrate layer 211 from producing a metallic taste and affecting the atomized taste of the aerosol generating medium 200. In some embodiments, a dense protective film may be formed on the surface of the first substrate layer 211 by anodizing or electrophoresis. In other embodiments, a ceramic film may also be formed on the inner wall surface of the first substrate layer 211 by vacuum deposition or the like.

[0047] The heating method of the heating device 21 is not limited. For example, it can adopt one or more of resistance heating, electromagnetic heating, infrared heating, etc. In the present embodiment, the heating device 21 adopts resistance heating, and the heating device 21 also includes a heating element 214 arranged on the surface of the first substrate layer 211 and / or the second substrate layer 213. The heating element 214 can be a resistance heating film or a resistance heating wire. Preferably, the heating element 214 can be arranged on the outer wall surface of the second substrate layer 213, which is easy to process and form, and can avoid the heating element 214 from directly contacting the aerosol generating medium 200. Of course, in other embodiments, the heating element 214 can also be arranged on the inner wall surface of the first substrate layer 211, or can also be arranged on the outer wall surface of the first substrate layer 211 or the inner wall surface of the second substrate layer 213.

[0048] The heating element 214 may include only one heating track, or may include at least two heating tracks connected in series or in parallel. The at least two heating tracks connected in series or in parallel may be arranged at intervals in the axial direction and / or the circumferential direction of the heating device 21 .

[0049] In some embodiments, the atomizing assembly 20 may further include a fixing tube 24 sleeved outside the heating device 21. An introduction hole 241 and a receiving hole 242 are formed in the fixing tube 24 along the axial direction from top to bottom. The introduction hole 241 is used for inserting the aerosol generating medium 200, and the receiving hole 242 is used for receiving the heating device 21.

[0050] The diameter of the introduction hole 241 is smaller than that of the receiving hole 242, so that a step surface 2412 is formed at the intersection of the introduction hole 241 and the receiving hole 242, and the upper end surface of the heating device 21 can directly or indirectly abut against the step surface 2412. Specifically, in this embodiment, the upper end surface of the heating device 21 abuts against the step surface 2412 through an annular sealing gasket 25. The sealing gasket 25 can be made of elastic materials such as silicone, which can achieve airtightness of the atomization chamber 2110.

[0051] In addition, the aperture of the receiving hole 242 may be larger than the outer diameter of the second base layer 213 , so that the outer wall surface of the second base layer 213 and the hole wall surface of the receiving hole 242 are spaced apart, which is beneficial to the heat insulation between the fixing tube 24 and the heating device 21 .

[0052] The aperture (or cross-sectional area) of the introduction hole 241 may be larger than the outer diameter (or cross-sectional area) of the aerosol generating medium 200, so that when the aerosol generating medium 200 is inserted into the introduction hole 241, an air intake gap 2410 is formed between the outer surface of the aerosol generating medium 200 and the hole wall of the introduction hole 241. During inhalation, the outside air may enter the heat conducting medium 212 through the air intake gap 2410 and the air inlet 2113 in sequence, and after being preheated by the heat conducting medium 212, the preheated air flows out to the air flow channel 220 through the air outlet 2114, and enters the aerosol generating medium 200 from the bottom of the aerosol generating medium 200.

[0053] The upper end of the fixed tube 24 can be inserted into the socket 11 of the housing 10, and the upper end surface of the fixed tube 24 can be flush with the upper end surface of the housing 10 or can also protrude from the upper end surface of the housing 10, so that the upper end of the air intake gap 2410 is directly connected to the outside air. In other embodiments, the upper end surface of the fixed tube 24 can also be lower than the upper end surface of the housing 10, and the upper end of the air intake gap 2410 is connected to the outside air through the socket 11.

[0054] In some embodiments, the atomizer assembly 20 may further include a fixing seat 23 disposed at the lower end of the fixing tube 24 and covering the lower end opening of the fixing tube 24. The lower end surface of the base 22 may be against the fixing seat 23. The fixing seat 23 may be at least partially embedded in the lower end opening of the fixing tube 24, and may be fixed to the fixing tube 24 by means of buckling or the like. Of course, in other embodiments, the lower end of the fixing tube 24 may also be embedded in the fixing seat 23.

[0055] Figure 5 The heat conducting medium 212 in a modified embodiment of the present invention is shown, and the heat conducting medium 212 has a plurality of channels 2120 through which air can pass. In this embodiment, the plurality of channels 2120 are arranged on the outer wall surface of the heat conducting medium 212 and are evenly spaced in the circumferential direction of the heat conducting medium 212, and each channel 2120 extends axially downward from the upper end surface of the heat conducting medium 212 to the lower end surface of the heat conducting medium 212.

[0056] It is understandable that in other embodiments, the plurality of grooves 2120 may also be provided on the inner wall surface of the heat-conducting medium 212, or may be provided on both the outer wall surface and the inner wall surface of the heat-conducting medium 212. In addition, the shape of each groove 2120 is not limited, for example, it may also extend along a straight line at a certain angle to the axial direction of the heat-conducting medium 212, or may also extend in a curved or broken line shape.

[0057] Figure 6 The atomizer assembly 20 in a modified embodiment of the present invention is shown. The atomizer assembly 20 adopts a composite heating method, which may include a heating element 214 disposed on the surface of the first substrate layer 211 and / or the second substrate layer 213 and an electromagnetic coil 26 sleeved on the periphery of the heating device 21. The heating element 214 may include a resistive heating element and / or an infrared coating.

[0058] The electromagnetic coil 26 may be sleeved on the fixed tube 24 to generate an electromagnetic field after being energized. In one embodiment, the first substrate layer 211 and / or the second substrate layer 213 include a susceptor material or are made of a susceptor material. In another embodiment, a susceptor material may also be provided in the aerosol generating medium 200 or in the heat conducting medium 212. The term "susceptor material" is used to describe a material that can convert electromagnetic energy into heat. When the susceptor material is located in an electromagnetic field, the electromagnetic field may generate eddy currents and / or hysteresis losses in the susceptor material, thereby causing the susceptor material to generate heat energy, thereby heating the aerosol generating medium 200.

[0059] Figure 7-8The figure shows a heating device 21 in a modified embodiment of the present invention. The heating device 21 in this embodiment is in sheet shape, and the upper end of the heating device 21 can be inserted into the aerosol generating medium 200 for heating. Preferably, the first substrate layer 211, the heat conducting medium 212, and the second substrate layer 213 of the heating device 21 can be arranged in sequence in the thickness direction thereof, which is conducive to the rapid and uniform conduction of heat to all parts of the heating device 21. External air can enter from the lower end of the cavity 2130, flow to the upper end of the cavity 2130 through the heat conducting medium 212, and then enter the aerosol generating medium 200.

[0060] Of course, the heating method of the heating device 21 is not limited. In addition, the surface of the heating device 21 that contacts the aerosol generating medium 200 may also be provided with a protective film to prevent the first substrate layer 211 and the second substrate layer 213 from generating odors that affect the atomized taste of the aerosol generating medium 200, and to reduce the adhesion of the heated aerosol generating medium 200 to the heating device 21.

[0061] It can be understood that the above-mentioned technical features can be used in any combination without limitation.

[0062] The above embodiments only express the specific implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A heating device, characterized in that: The invention comprises a first substrate layer (211) and a second substrate layer (213) which are arranged opposite to each other, wherein a cavity (2130) is formed between the first substrate layer (211) and the second substrate layer (213), and the cavity (2130) has an air inlet end connected to the external air and an air outlet end connected to the aerosol generating medium (200); The heating device (21) further comprises a heat-conducting medium (212) which is arranged in the cavity (2130) and through which airflow can pass.

2. The heating device according to claim 1, characterized in that The heat-conducting medium (212) includes one or more of a porous structure, a wire mesh or a groove structure.

3. The heating device according to claim 1, characterized in that The first substrate layer (211) is tubular and has an atomization cavity (2110) formed therein for accommodating the aerosol generating medium (200); the second substrate layer (213) is tubular and is sleeved outside the first substrate layer (211).

4. The heating device according to claim 3, characterized in that The atomizing chamber (2110) has a first end (2111) for inserting the aerosol generating medium (200) and a second end (2112) opposite to the first end (2111), The air outlet end of the cavity (2130) is connected to the second end (2112), The air inlet end of the cavity (2130) is in communication with the first end (2111).

5. The heating device according to claim 4, characterized in that The end surfaces at both ends of the first base layer (211) are respectively recessed to form at least one air inlet (2113) connecting the air inlet end of the cavity (2130) with the first end (2111) and at least one air outlet (2114) connecting the air outlet end of the cavity (2130) with the second end (2112).

6. The heating device according to claim 5, characterized in that The at least one air inlet (2113) comprises a plurality of air inlets (2113) arranged evenly spaced in a circumferential direction of the first substrate layer (211), The at least one air outlet (2114) comprises a plurality of air outlets (2114) arranged evenly spaced apart in the circumferential direction of the first base layer (211).

7. The heating device according to claim 1, characterized in that The heating device (21) is in the shape of a sheet.

8. The heating device according to any one of claims 1 to 7, characterized in that: Also includes: A heating element (214) is disposed on the surface of the first base layer (211) and / or the second base layer (213).

9. An atomizing assembly, characterized in that: It comprises a heating device (21) as claimed in any one of claims 1 to 8.

10. An aerosol generating device, characterized in that: It comprises a housing (10) and an atomization assembly (20) according to claim 9 and arranged in the housing (10).

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