CN211910542U - Gas mist generating device and heating mechanism for gas mist generating device - Google Patents

Abstract

The utility model provides an aerosol generating device and a heating mechanism used for the aerosol generating device; wherein the aerosol generating device comprises a housing, a barrel is arranged in the housing; a heater is arranged in the barrel, and the heater is configured to extend along the axial direction of the barrel and surround the chamber; an air medium layer configured to extend in an axial direction of the cartridge and surround the heater; the airflow channel comprises a first part at least partially extending from the open end to the closed end in the air medium layer, and a second part extending from the closed end to the open end in the chamber. The aerosol generating device separates the heating mechanism part from the space in the shell through the cylinder, and the air in the shell can only enter the cylinder in one direction and then is sucked away through the airflow structure in use, so that the convection between the heating part and the air in the shell is prevented, the convection diffusion of heat is prevented, and the surface temperature of the shell can be reduced while the heat utilization rate is improved.

Description

Gas mist generating device and heating mechanism for gas mist generating device

Technical Field

The embodiment of the utility model provides a heating incombustible smoking set technical field especially relates to an aerial fog generates device and is used for aerial fog to generate device's heating mechanism.

Background

Smoking articles (e.g., cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. Attempts have been made to replace these tobacco-burning products by making products that release compounds without burning.

An example of such a product is a heating device that releases a compound by heating rather than burning the material. For example, the material may be tobacco or other non-tobacco products, which may or may not include nicotine. As another example, there are infrared heating devices that heat tobacco products by means of infrared radiation so that they release compounds to generate an aerosol. For example, the 201321350103.0 patent as a known technology proposes a heating device structure in which a nano far-infrared coating layer and a conductive coating layer are sequentially formed on the outer surface of a quartz tube, and after the conductive coating layer is connected with a power supply for supplying power, the nano far-infrared coating layer generates heat by itself in the power supply, and forms an electronic transition to generate far infrared rays while generating heat, and the far infrared rays are radiated to a tobacco product in the quartz tube to heat the tobacco product. In use of the above known device, heat within the quartz tube is radiated or transferred radially outwardly to the outer envelope of the device, causing the temperature of the outer envelope to rise.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the aerial fog among the prior art generated the device shell temperature and rise, the embodiment of the utility model provides an aerial fog generation device and be used for aerial fog generation device's heating mechanism with prevent shell temperature rising.

Based on the above, an embodiment of the present invention provides an aerosol generating device for heating a smokable material to generate an aerosol for smoking, including a housing; a canister comprising an open end and a closed end is disposed within the housing, smokable material being at least partially receivable in or removable from the canister through the open end; the cylinder is internally provided with:

a chamber extending in an axial direction of the cartridge for receiving smokable material;

a heater for heating smokable material within the chamber, the heater being configured to extend in an axial direction of the cartridge and to form the chamber therearound;

a layer of air medium configured to extend in an axial direction of the cartridge and to surround the heater;

an airflow channel comprising a first portion extending at least partially within the air dielectric layer along the open end toward the closed end, and a second portion extending within the chamber along the closed end toward the open end.

In a preferred embodiment, the first and second portions meet at a location within the barrel adjacent the closed end.

In a preferred embodiment, the heater is an infra-red emitter which heats the smokable material by radiating infra-red light to the smokable material.

In a preferred implementation, the cartridge is further provided with a thermal insulation member located outside the heater in the radial direction;

the air medium layer comprises a first air medium layer positioned between the heater and the heat insulating member along the radial direction and a second air medium layer positioned between the heat insulating member and the cylinder;

the thermal insulation, the first air dielectric layer and the second air dielectric layer serve to reduce the conduction of heat generated by the heater radially outward.

In a preferred implementation, the first portion of the air flow channel extends at least partially within the second layer of air media in a direction from the open end to the closed end.

In a preferred implementation, the first and second layers of air dielectric are configured to be substantially hermetically sealed from each other to minimize or prevent the flow of air between the first and second layers of air dielectric.

In a preferred implementation, the open end of the cartridge is provided with a cartridge cover; the cartridge cover being provided with a receiving aperture through which smokable material may be received in the chamber;

the cartridge is configured to prevent, in use, air or aerosol within the cartridge from exiting other than through the receiving aperture.

In a preferred embodiment, the cartridge cover is provided with an air inlet for external air to enter the cartridge, and the first portion of the air flow passage is in air flow communication with the air inlet.

In a preferred implementation, there is provided within the cartridge a retaining mechanism arranged around the chamber for retaining smokable material received within the chamber to resist movement of the smokable material in a radial direction of the chamber;

the inner surface of the receiving aperture is spaced from the central axis of the chamber by a distance greater than the shortest distance of the retaining means from the central axis in a radial direction of the chamber so that the receiving aperture is spaced from the surface of the smokable material received within the chamber to form the air inlet.

In a preferred implementation, the cartridge cover is annular and is disposed coaxially with the cartridge, and the annular central bore of the cartridge cover is configured as the receiving bore;

the air inlet comprises an air hole which penetrates through the cylinder cover along the axial direction.

In a preferred implementation, the heater includes an electrical connection that extends at least partially through to the exterior of the cartridge, such that power can be provided to the heater through the electrical connection.

In a preferred implementation, the electrical connections comprise electrical contacts or contacts formed or bonded to the outer surface of the barrel.

In a preferred implementation, a lower support is provided within the cartridge that supports the heater proximate the closed end; the lower support extends at least partially into the heater to form a region of reduced internal diameter of the chamber, thereby providing a stop for smokable material received in the chamber.

The utility model further provides a heating mechanism for the aerosol generating device, which comprises a cylinder; the canister having axially opposed open and closed ends, smokable material being at least partially receivable in or removable from the canister through the open end; the cylinder is internally provided with:

a chamber extending in an axial direction of the cartridge for receiving smokable material;

a heater extending in an axial direction of the cartridge and forming the chamber therearound and configured to heat smokable material;

a layer of air dielectric configured to extend in an axial direction of the cartridge and to surround the infrared emitter;

an airflow channel comprising a first portion extending at least partially within the air dielectric layer along the open end toward the closed end, and a second portion extending within the chamber along the closed end toward the open end.

The aerosol generating device separates the heating mechanism part from the space in the shell through the cylinder, and the air in the shell can only enter the cylinder in one direction and then is sucked away through the airflow structure in use, so that the convection between the heating part and the air in the shell is prevented, the convection diffusion of heat is prevented, and the surface temperature of the shell can be reduced while the heat utilization rate is improved.

The aerosol generating device separates the heating mechanism part from the space in the shell through the cylinder, and the air in the shell can only enter the cylinder in one direction and then is sucked away through the airflow structure in use, so that the convection between the heating part and the air in the shell is prevented, the convection diffusion of heat is prevented, and the surface temperature of the shell can be reduced while the heat utilization rate is improved.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Figure 1 is a schematic diagram of an aerosol-generating device according to an embodiment in use;

figure 2 is a schematic cross-sectional view of the aerosol-generating device of figure 1;

fig. 3 to 2 are schematic structural diagrams of the heating mechanism at a view angle;

FIG. 4 is an exploded schematic view of the heating mechanism of FIG. 3;

FIG. 5 is a schematic perspective cross-sectional view of the cartridge of FIG. 4;

FIG. 6 is a schematic cross-sectional view of the heating mechanism of FIG. 3;

FIG. 7 is a schematic view of the air flow path of the heating mechanism of FIG. 3 in use;

FIG. 8 is a schematic view of the heating mechanism of FIG. 3 from a further perspective;

FIG. 9 is a schematic cross-sectional view of a heating mechanism according to yet another embodiment;

fig. 10 is a schematic sectional view of a heating mechanism according to still another embodiment.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and embodiments.

One embodiment of the present invention provides an aerosol-generating device for heating, rather than burning, smokable material, such as a cigarette, to volatilize or release at least one component of the smokable material to form an aerosol for smoking.

In a preferred embodiment, the aerosol-generating device heats the smokable material by radiating far infrared radiation having a heating effect; for example 3 to 15 μm, when the wavelength of the infrared light matches the wavelength of absorption of the volatile components of the smokable material, in use, the energy of the infrared light is readily absorbed by the smokable material, and the smokable material is heated to volatilise at least one of the volatile components to produce an aerosol for smoking.

The structure of the aerosol-generating device according to an embodiment of the present invention can be seen from fig. 1 to 2, the entire outer shape of the device is generally configured in a flat tube shape, and the outer member of the aerosol-generating device includes:

a housing 10 having a hollow structure therein to form an assembly space for necessary functional components such as infrared radiation;

an upper cover 11 located at an end of the housing 10 in a length direction; the upper cover 11 can cover the upper end of the shell 10 on one hand, so that the appearance of the aerosol generating device is complete and beautiful; and on the other hand, the upper end of the housing 10, thereby facilitating the installation, removal and replacement of various functional components in the housing 10.

As can further be seen from fig. 1 and 2, the upper cover 20 has an opening 21 through which opening 21 the smokable material a may be at least partially received within the housing 10 in the length direction of the housing 10 to be heated, or may be removed from within the housing 10 through the opening 21.

The housing 10 is further provided with a switch button 13 on one side in the width direction, and the user can control the start or stop of the operation of the aerosol-generating device by manually actuating the switch button 13.

Further in fig. 2, inside the housing 10 are provided:

a battery cell 14 for supplying power;

a control circuit board 15 integrated with a circuit for controlling the operation of the aerosol-generating device;

the charging interface 16 for charging the battery cell 14, such as a USB type-C interface, a Pin needle interface, or the like, may charge the battery cell 14 after being connected to an external power source or an adapter.

With further reference to figures 2 to 4, in order to effect heating of the smokable material a, a heating mechanism is provided within the housing 10, the configuration and construction of which after assembly can be seen in figure 3; the heating mechanism is integrally assembled to have an open cylindrical structure at the upper end and is installed in the housing 10 along the length direction of the housing 10. Specifically, the heating mechanism includes:

a heater 20 having a generally tubular shape extending along the length of the housing 10, the space inside of which forms a chamber 25 for receiving and heating the smokable material A; and the upper end of the tubular shape is open opposite the opening 12 of the upper lid 11 so that the smokable material a may be received in the chamber 25 through the opening 12 of the upper lid 11 for heating or removal.

In a preferred implementation, the heater 20 is an infrared emitter of infrared radiation, and as shown in particular in fig. 4, comprises:

a tubular base body 21, the base body 21 serving as a rigid carrier and an article for containing the smokable material A, and in practice may be made of a material resistant to high temperatures and transparent to infrared, such as quartz glass, ceramic or mica; preferably transparent material, such as high temperature resistant material with infrared transmittance of 95% or more;

an infrared-emitting coating layer 22 formed on at least a part of the outer surface of the tubular base body 21, the infrared-emitting coating layer 22 being capable of heating itself when energized, thereby radiating infrared rays having a wavelength of 3 to 15 μm or more, for example, far infrared rays useful for heating the smokable material a. When the wavelength of the infrared light matches the wavelength of absorption of the volatile components of the smokable material a, the energy of the infrared light is readily absorbed by the smokable material a.

Typical practice mid IR-emitting coatings 22 may be coatings made from ceramic-based materials such as zirconium, or Fe-Mn-Cu based, tungsten based, or transition metals and their oxides.

In a preferred embodiment, the infrared emission coating 22 is preferably composed of oxides of at least one metal element of Mg, Al, Ti, Zr, Mn, Fe, Co, Ni, Cu, Cr, etc., which radiate above far infrared rays having heating effect when heated to a suitable temperature; the thickness is preferably controlled to be 30-50 μm; the oxide of the above metal elements can be sprayed on the outer surface of the matrix 21 by means of atmospheric plasma spraying and then cured to obtain the oxide of the metal elements;

in other variant implementations, the infrared-emitting coating 22 may also be formed on the inner surface of the substrate 21.

The heater 20 further includes a first conductive coating 23 and a second conductive coating 24 respectively formed on at least a portion of outer surfaces of opposite ends of the infrared emission coating 22; wherein, according to the preferred implementation shown in fig. 4, the first and second conductive coatings 23, 24, each having the shape of a ring and in contact with the infrared-emitting coating 22, may be electrically connected, in use, to the positive and negative electrodes of the cell 14, respectively, so as to cause the infrared-emitting coating 22 to generate heat electrically and radiate infrared rays. The first conductive coating 23 and the second conductive coating 24 may be conductive coatings formed by impregnation or coating, etc., and may typically be metals or alloys including silver, gold, palladium, platinum, copper, nickel, molybdenum, tungsten, niobium, or the like.

In other variant implementations of the above heater 20 in the form of infrared radiation, the heater 20 may also be a resistive or electromagnetic induction heater; such as a resistive heater made of a resistive material and electrically connected to the electric core 14, or an inductive heater made of an inductive material with excellent magnetic permeability and capable of generating heat when penetrated by an alternating magnetic field.

Further in the preferred implementation shown in fig. 2 and 4, the heating mechanism further comprises:

an insulating member 30 located outside the heater 20 in a radial direction, the insulating member 30 having a tubular shape and including an inner pipe wall 31 and an outer pipe wall 33 arranged in order from inside to outside in the radial direction, and a central region 32 located between the inner pipe wall 31 and the outer pipe wall 33; in practice, the inner tube wall 31 and the outer tube wall 33 may be made of rigid material such as stainless steel, ceramic, PPEK, etc., and the pressure in the central region 32 is configured to be lower than the pressure outside the thermal insulation member 30, i.e., to have or form a certain vacuum, so as to reduce the conduction of heat generated by the heater 20 radially outward.

In practice, of course, the inner pipe wall 31 of the thermal insulation member 30 is spaced from the heater 20 to form a first air dielectric layer 34, which further promotes thermal insulation by the low thermal conductivity of air.

Meanwhile, the heating mechanism further includes a cartridge 60 for accommodating and enclosing the heater 20 and the heat insulator 30; the cartridge 60 is preferably made of PEEK, ceramic or other material having a relatively low thermal conductivity, and in this embodiment, a certain distance is maintained between the outer tube wall 33 and the inner wall of the cartridge 60 to form a second air medium layer 35, which second air medium layer 35 can promote thermal insulation by the low thermal conductivity of air, and can provide an air flow path for external air to enter the chamber 25 of the heater 20 during suction.

In a preferred implementation, the above first air media layer 34 is configured to be substantially sealed, thereby reducing heat exchange or convection with the second air media layer 35, etc., and thereby enhancing the thermal insulation effect.

Specifically, in order to facilitate the packing and fixing of the heater 20 and the thermal insulating member 30 in the cartridge 60, the heating mechanism further includes an upper holder 40 and a lower holder 50 each designed in a substantially hollow annular shape, and both ends of the heater 20 and the thermal insulating member 30 abut on the upper holder 40 and the lower holder 50, respectively, in practice.

In order to facilitate the installation and fixation of the upper holder 40 and the lower holder 50 in the tub 60, as shown in fig. 5 and 6, an annular support portion 61 extending in the axial direction is provided on the inner bottom wall of the tub 60, the lower holder 50 is fixed in the tub 60 by abutting or nesting on the support portion 61 in the axial direction, and the lower ends of the heater 20 and the heat insulating member 30 abut on the lower holder 50 so that the lower ends are stably held. After the upper holder 40 is positioned at the upper portion of the heater 20 and the heat insulating member 30 and mounted, the upper holder 40 is pressed against the upper portion of the heater 20 and the heat insulating member 30 by an annular cover 70 provided in an opening of the drum 60, thereby forming a stably packaged heating mechanism.

The central aperture of the annular canister cover 70 forms a receiving aperture for the smokable material a to be received from outside the canister 60 to the chamber 25 of the heater 20 or removed from within the chamber 25.

Further in practice, the heating means can also at least partially direct or create a path for the air flow during the suction. In particular, the method comprises the steps of,

referring to fig. 6 and 7, when smokable material a is received in the chamber 25 of the heater 20, the annular canister cover 70 is dimensioned with an inner diameter larger than the outer diameter of the smokable material a, thereby allowing external air to enter the canister 60 from the gap between the inner wall of the annular canister cover 70 and the outer surface of the smokable material a; or the distance L1 from the inner wall of the central hole of the annular canister cover 70 to the central axis S of the chamber 25 in the radial direction is greater than the shortest distance L2 from the holding structure for holding the smokable material a to the central axis S of the chamber 25, so that there is a space between the inner wall of the central hole of the annular canister cover 70 and the outer surface of the smokable material a received in the chamber 25, forming the air inlet 73 for the external air to be introduced into the canister 60. The retaining structure may be provided by the inner surface of the tubular heater 20 forming the chamber 25, or by the inner wall of the central hole of the upper support 40 through which the smokable material a passes, and it can be seen that the inner diameter of the tubular heater 20 and the inner diameter of the central hole of the upper support 40 are both comparable to the outer diameter of the smokable material a, so as to engage the surface of the smokable material a and thereby retain the smokable material a against movement in the radial direction.

Further, the annular cartridge cover 70 is provided with a first air hole 71 penetrating in the radial direction, and as can be seen from fig. 6 and 7, outside air entering the cartridge 60 can be let into the second air medium layer 35 through this first air hole 71;

meanwhile, a second air hole 62 penetrating in the radial direction is provided on the support portion 61, so that the air of the second air medium layer 35 can enter the hollow of the lower bracket 50 and the chamber 25 of the heater 20 through the second air hole 62, and finally enter the smokable material a to be suctioned.

With further reference to fig. 4 and 6, the lower bracket 50 has a boss 51 which is annular and extends into the chamber 25 of the heater 20, thereby allowing, on the one hand, the hollow of the lower bracket 50 to be in air flow communication with the chamber 25; the boss 51 on the other hand extends to a portion of the chamber 25 in which the internal diameter of the chamber 25 is reduced so that the smokable material a may abut against the boss 51, providing a stop for the smokable material a.

As can also be seen in fig. 4 and 6, the portion of the annular cap 70 and the cartridge 60 that engage is also provided with a flexible seal 80, such as a silicone gasket, for hermetically sealing the engaged portion. Thereby ensuring that air or aerosol within the cartridge 60 can only be drawn by the user into the smokable material a and out of the cartridge 60 during smoking.

By the structure of guiding the air flow configured by the above cartridge 60, the air flow during the suction process includes an air inlet path extending from the upper end of the cartridge cover 70 into the cartridge 60 along the axial direction of the cartridge 60 to near the bottom of the cartridge 60, and an air outlet path sucked from the support portion 61 near the bottom in the cartridge 60 into the chamber 25; the heat radiated or conducted from the heater 20 can be recovered into the chamber 25 along with the flow of the intake air, reducing the heat radiated or transferred to the surface of the housing 10.

Whilst further in the preferred implementation shown in figure 7, the construction of smokable material a comprises three portions, an aerosol-forming substrate portion A3, a cooling portion a2 having an internal cooling cavity, and a filter portion a1, disposed in series in the axial direction; wherein, in use, the aerosol-forming substrate portion A3 is used to generate an aerosol during heating and the cooling portion a2 is used to cool the aerosol during delivery so that it is ultimately filtered through the filter portion a1 and then inhaled by a user. The above heating mechanism is configured such that when smokable material a is received within the chamber 25, at least a portion of the extent of the cooling portion a2 in the axial direction coincides with the extent of the air intake path in the axial direction, to assist in cooling the aerosol and improve the mouth feel of the user.

Of course, in order to ensure that the external air can smoothly enter the cartridge 60 from the outside of the casing 10 in the implementation, a proper gap space can be reserved at the joint of the opening 12 on the casing 10 or the switch button 13 and the casing 10 shown in fig. 1, and the cartridge 60 can enter the air from the outside into the casing 10 through the air inlet so as to form a complete air flow circulation.

Alternatively, in other variant implementations, such as shown in fig. 9 and 10, the first air hole 63a may be opened on the side wall of the cylinder 60a near the upper end, or the first air hole 71b may be formed on the cylinder cover 70b to penetrate axially, so as to be in air flow communication with the air inlet on the housing 10, so that the external air can directly enter the cylinder 60a/60b to form the air inlet paths R1 and R2 shown in fig. 9 and 10, respectively.

Meanwhile, in order to facilitate the convenient installation of the heating mechanism as a whole in the housing 10, an electrical contact or contact 63 for supplying power to the heater 20 is further provided on the outer surface of the cartridge 60, and the heating mechanism can be conveniently installed and removed in the housing 10 by connecting the electrical contact or contact 63 to the control circuit board 15 through a conductive pogo pin, a conductive sheet or the like provided in the housing 10 in use.

Or in other variant implementations, the first conductive coating 23 and the second conductive coating 24 of the heater 20 can be connected to the control circuit board 15 by soldering leads or pins, and at least partially penetrating the barrel 60, so as to supply power to the heater 20.

The heating mechanism is enclosed inside the cartridge 60 by the above cartridge 60, so that the heating mechanism is isolated from heat transfer inside the housing 10, and air inside the housing 10 can only be sucked away after entering the cartridge 60 in one direction in use due to the restriction of air flow, so that the heating mechanism is prevented from convection with the air inside the housing 10, and the convection diffusion of heat is prevented.

It should be noted that the preferred embodiments of the present invention are shown in the specification and the drawings, but not limited to the embodiments described in the specification, and further, it will be apparent to those skilled in the art that modifications and variations can be made in the above description and all such modifications and variations should fall within the scope of the appended claims.

Claims (14)

1. An aerosol-generating device for heating smokable material to generate an aerosol for smoking, comprising a housing; wherein a canister comprising an open end and a closed end is provided within the housing, smokable material being at least partially receivable in or removable from the canister through the open end; the cylinder is internally provided with:

a chamber extending in an axial direction of the cartridge for receiving smokable material;

a heater for heating smokable material received in the chamber, the heater being configured to extend in an axial direction of the cartridge and to surround the chamber;

a layer of air medium configured to extend in an axial direction of the cartridge and surround the heater;

an airflow channel comprising a first portion extending at least partially within the air dielectric layer along the open end toward the closed end, and a second portion extending within the chamber along the closed end toward the open end.

2. An aerosol-generating device according to claim 1, wherein the first and second portions meet at a location within the cartridge proximate the closed end.

3. An aerosol-generating device according to claim 1 or 2, wherein the heater is an infrared emitter which heats the smokable material by radiating infrared light to the smokable material.

4. An aerosol-generating device according to claim 1 or 2, wherein the cartridge is further provided with an insulating member located radially outside the heater;

the air medium layer comprises a first air medium layer positioned between the heater and the heat insulating member along the radial direction and a second air medium layer positioned between the heat insulating member and the cylinder;

the thermal insulation, the first air dielectric layer and the second air dielectric layer serve to reduce the conduction of heat generated by the heater radially outward.

5. An aerosol-generating device according to claim 4, wherein the first portion of the airflow channel extends at least partially within the second layer of air media in a direction from the open end to the closed end.

6. The aerosol-generating device of claim 4, wherein the first and second layers of airborne media are configured to be substantially hermetically sealed from each other to minimize or prevent the flow of air between the first and second layers of airborne media.

7. An aerosol-generating device according to claim 1 or 2, wherein the open end of the cartridge is provided with a cartridge cap; the cartridge cover being provided with a receiving aperture through which smokable material may be received in the chamber;

the cartridge is configured to prevent, in use, air or aerosol within the cartridge from exiting other than through the receiving aperture.

8. An aerosol-generating device according to claim 7, wherein the cartridge cap is provided with an air inlet for the ingress of external air into the cartridge, the first portion of the air flow passage being in air flow communication with the air inlet.

9. An aerosol-generating device according to claim 8, wherein the cartridge is provided with retaining means arranged around the chamber for retaining smokable material received in the chamber to resist movement of the smokable material in a radial direction of the chamber;

the inner surface of the receiving aperture is spaced from the central axis of the chamber by a distance greater than the shortest distance of the retaining means from the central axis in a radial direction of the chamber so that the receiving aperture is spaced from the surface of the smokable material received within the chamber to form the air inlet.

10. The aerosol-generating device of claim 8, wherein the cartridge cover is annular and is disposed coaxially with the cartridge, and the annular central aperture of the cartridge cover is configured as the receiving aperture;

the air inlet comprises an air hole which penetrates through the cylinder cover along the axial direction.

11. An aerosol-generating device according to claim 1 or 2, wherein the heater comprises an electrical connection which extends at least partially through the exterior of the cartridge, such that power can be supplied to the heater via the electrical connection.

12. An aerosol-generating device according to claim 11 in which the electrical connections comprise electrical contacts or contacts formed or bonded to an outer surface of the cartridge.

13. An aerosol-generating device according to claim 1 or 2, wherein a lower support is provided within the cartridge to support the heater proximate the closed end; the lower support extends at least partially into the heater to form a region of reduced internal diameter of the chamber, thereby providing a stop for smokable material received in the chamber.

14. A heating mechanism for an aerosol-generating device, the heating mechanism comprising a cartridge; the canister having axially opposed open and closed ends, smokable material being at least partially receivable in or removable from the canister through the open end; the cylinder is internally provided with:

a chamber extending in an axial direction of the cartridge for receiving smokable material;

a heater extending in an axial direction of the cartridge and surrounding the chamber and configured to heat smokable material received in the chamber;

a layer of air medium configured to extend in an axial direction of the cartridge and to surround the heater;

an airflow channel comprising a first portion extending at least partially within the air dielectric layer along the open end toward the closed end, and a second portion extending within the chamber along the closed end toward the open end.

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