Heating device for aerosol generating device

Abstract

A heating device for an aerosol generating device is disclosed, the heating device (10) comprising an insulating body including an inner wall (16) and an outer wall (14), the inner wall defining a heating zone and including an opening (20) through which aerosol-forming material can be received into the heating zone, the outer wall being oriented radially outward relative to the inner wall, the insulating body further comprising a welded bridge (24) connecting the inner wall and the outer wall, the welded bridge including a groove (32), and a heating element disposed on the inner wall and configured to heat the received aerosol-forming material.

Description

Technical Field

[0001] The present invention relates to a heating device for an aerosol generating device and an aerosol generating device including the heating device. The present disclosure is particularly applicable to a portable aerosol generating device that can be self - contained. In particular, the present invention relates to an aerosol generating device having a heater disposed within a vacuum chamber or a heat - insulating chamber.

Background Art

[0002] The production of electronic cigarettes that heat a solid or semi - solid aerosol - forming substrate (typically called a consumable) including tobacco without burning it is a growing area of interest. These aerosol generating devices typically receive a tobacco consumable rod within a heating chamber. The rod is heated to release an aerosol that can be inhaled by the user. A common problem in these devices is that the heater that supplies heat to the heating chamber can also unnecessarily heat other parts of the device. This can be particularly disadvantageous in a compact device, as the temperature of the outer surface of the device held by the user can become unacceptably high.

[0003] To mitigate such effects, some aerosol generating devices have been provided with a vacuum chamber. This vacuum chamber can provide a space between the heater and the outer surface, enabling thermal separation of the heating chamber and the outer surface held by the user. Among such aerosol generating devices, it is also desirable to improve the efficiency of the heating operation so as to extend the battery life of the device. For this purpose, a vacuum thermal insulator has been implemented within the aerosol generating device to insulate the cavity in which the aerosol substrate is heated and limit heat loss to the external environment.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The objective of this invention is to further improve heating efficiency and reduce undesirable heat loss. [Means for solving the problem]

[0005] According to one aspect of the present invention, a heating device for an aerosol generating device is provided, the heating device comprising an insulating body including an inner wall and an outer wall, the inner wall defining a heating zone and including an opening through which an aerosol-forming material can be received into the heating zone, the outer wall being oriented radially outward relative to the inner wall, and the insulating body further comprising a welded bridge connecting the inner wall and the outer wall, the welded bridge including a groove, and a heating element disposed on the inner wall and configured to heat the received aerosol-forming material.

[0006] The heating zone is better insulated by reducing the amount of welding material connecting the inner and outer walls of the insulator. Naturally, the heat generated from the heating element is transferred to the inner wall and the received aerosol-forming material by thermal conduction. The heating zone can be considered as a cavity into which aerosol-forming material can be received and heated by the heating element. The generated heat is insulated by the space between the outer and inner walls, which may be a vacuum or filled with insulating material. However, heat can move from the inner wall to the outer wall by passing across the bridge (welded bridge) connecting the inner and outer walls. To minimize and limit thermal conduction or heat loss from the inner wall / heating zone across the bridge, the thickness of the bridge material is reduced by cutting grooves from the welded bridge, while simultaneously ensuring the structural / physical integrity of the bridge (for example, to seal in a vacuum).

[0007] In some embodiments, the inner and outer walls each comprise a metallic material, and the first end of the outer wall may be laser-welded to the bridge. Thus, both the inner and outer walls may be made of metallic material for ease of manufacture. The inner wall may comprise a metallic material to enhance heat transfer from the heater to the aerosol-generating material / consumables received in the heating zone. The bridge is preferably laser-welded to the inner wall. This allows for reliable bonding between the inner wall, the bridge, and the outer wall using high-precision laser welding techniques. Advantageously, laser welding provides particularly effective bonding between welded surfaces and requires a small surface area for bonding. Other welding techniques (e.g., resistance welding) may also be used.

[0008] The grooves may be V-shaped or U-shaped, or in practice any other shape, depending on the manufacturing / design requirements. As will be understood by those skilled in the art, the grooves may be cut into the weld bridge, which may be done preferably by grinding or machining, or by other methods in the art. Importantly, the grooves reduce the thickness of the weld bridge, and as a result, the reduced thickness portion of the bridge acts as a "thermal break," significantly reducing undesirable heat loss (i.e., heat conduction) from the heating zone. Thus, the present invention enhances the effectiveness of the heating device by reducing heat transfer from the inner wall to the outer wall and to the outside of the aerosol generating device.

[0009] The weld bridge may be a loop, preferably a ring. This allows the bridge to function as a spacer between the inner and outer walls, and also to seal an insulating space between the two walls. A ring-shaped loop ensures that the bridge surrounds the inner wall, allowing for a complete bond between the inner and outer walls.

[0010] The welded bridge preferably has a predetermined minimum thickness. Naturally, the welded bridge must be sufficiently connected to the inner and outer walls (at each end of the bridge) with a surface area sufficient to form a sufficient bond between the bridge and each wall. Such a surface area is determined by the thickness of the bridge material (and the length of the bridge material in the direction of each inner and outer wall). However, the thickness of the bridge may be reduced away from the ends of the welded bridge (i.e., in the middle portion of the bridge), in which case a groove may be cut into the middle portion of the bridge. Thus, the minimum thickness may be the thickness of the remaining material in the middle portion of the bridge where the groove is cut. For example, the minimum thickness of the welded bridge may be at the location of the groove's apex. The minimum thickness of the bridge's intermediate / groove portion may be predetermined to ensure that the welded bridge maintains structural integrity throughout its entire structure and provides an effective thermal insulation space between the inner and outer walls, particularly when the inner and outer walls, as well as the welded bridge, contain a vacuum or hold insulating material (which, if not contained, could leak or overflow from the space).

[0011] The weld bridge preferably contains a filler material, which allows for easier control of the thickness of the weld bridge. Suitable fillers and rods will be obvious to those skilled in the art of welding thin-walled joints. Alternatively, the bridge may be welded by melting the inner and outer walls (i.e., the base material) together without a filler material.

[0012] Preferably, the outer wall surface is positioned at least a predetermined distance from the inner wall surface. This makes it possible to provide a welded bridge of sufficient length to allow grooves to be cut into the bridge.

[0013] It is preferable that a vacuum is sealed between the inner wall and the outer wall. Alternatively, the insulator may further include an insulating material between the inner wall and the outer wall. For example, the first insulator may include an aerogel material between its inner wall and outer wall. Examples of insulating materials include, but are not limited to, air, aerogel materials, powders, or fibrous insulating materials.

[0014] Preferably, the heating device further includes a heating cup, the heating cup comprising an inner wall and an end that limits the insertion depth of the accepted aerosol-forming material. Thus, the heating cup has an end of the heating zone / cavity into which the accepted aerosol-forming consumable abuts. Thus, the heating device may have a closed end, thereby providing a single opening for airflow and insertion of the aerosol-forming consumable. Alternatively, the closed end may further include one or more holes that allow air to flow into the heating zone / cavity.

[0015] Preferably, the heating device further includes a heater sleeve, the heater sleeve including an inner wall. In these arrangements, a weld bridge may connect a first end of the inner wall to a first end of the outer wall, and a second weld bridge may be used to connect a second end of the inner wall to a second end of the outer wall. In this way, weld bridges may be provided at each end of the heater sleeve to limit heat conduction from the inner wall / heater sleeve. The heater sleeve allows airflow to pass through it so that the generated aerosol can be carried to the user by airflow when inhaled.

[0016] The heating element is preferably provided between the inner wall and the outer wall. The heating device may further include an electrical insulating layer provided between the heater and the inner wall. This can enhance the safety of the device by preventing electrical conduction to other components of the heating device or aerosol generating device. The electrical insulating layer may be provided as a layer of material deposited on the inner wall. Alternatively, this layer may be provided as a partial or full coating on the heater.

[0017] Preferably, the heating element includes an electrically resistive track printed or coated on the inner wall or wrapped around the inner wall. This allows the heating element to effectively transfer heat to the aerosol-generating material received by the inner wall by thermal conduction. The printed or coated heating element also ensures reliable electrical contact with the inner wall. Furthermore, ease of manufacture can be further improved. Alternatively, the heating element may include a separate heater track (e.g., a thin-film heater) wrapped around the inner wall. In other words, the heating element may include a thin-film heater having a conductive metal track placed between insulating layers such as a polyimide film. Alternatively, the heating element may include an induction heater powered by a coil placed inside an adiabatic body.

[0018] Preferably, the heating device further includes one or more wires configured to connect the heating element to a power source capable of supplying power to the heating element. The one or more wires may be routed through one or more gaps within the outer wall / cup. The wires can be lightweight, which can be advantageous in terms of reducing the weight carried by the user, as well as the thermal mass of the device.

[0019] This configuration may be easy to manufacture and therefore could reduce manufacturing costs. In one example, the contact between the wire and the insulation is a single-point contact. One or more seals may be provided around the wire to seal one or more gaps and may be configured to prevent air from entering the insulation space between the inner and outer walls and to hold the wire in place.

[0020] Preferably, the heating device further includes thermocouple cables and / or thermistor wires configured to connect the heating element to a control circuit, thereby enabling the control circuit to monitor and / or control the temperature of the heating element.

[0021] According to another aspect of the present invention, an aerosol generating device is provided which is configured to generate an aerosol for a user to inhale, the aerosol generating device including a heating device according to the first aspect.

[0022] According to another aspect of the present invention, a method for manufacturing a heating device according to the first aspect is provided. The method includes the step of providing an inner wall to define a heating zone, the inner wall including an opening through which an aerosol-forming substance can be received into the heating zone; the step of disposing a heating element on the inner wall, the heating element being configured to heat the received aerosol-forming substance; the step of providing an outer wall radially outward of the inner wall; the step of welding a bridge connecting the inner wall and the outer wall to seal the inner wall and the outer wall; and the step of cutting a groove in the bridge.

[0023] Hereinafter, embodiments of the present invention will be described by way of example with reference to the drawings. The drawings are as follows.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic view of an aerosol generating device including a heating device according to an embodiment of the present invention. [Figure 2A-2B] It is a cross-sectional view of a heating device according to an embodiment of the present invention. [Figure 3] It is a schematic cross-sectional view of a heating device according to another embodiment of the present invention. [Figure 4] It is a schematic cross-sectional view of another heating device according to another embodiment of the present invention.

Modes for Carrying Out the Invention

[0025] As described herein, vapor is generally understood to mean a substance that is in the gaseous phase at temperatures below its critical temperature. That is, vapor can condense into a liquid by increasing its pressure without lowering its temperature. Aerosol, on the other hand, is fine solid particles or droplets suspended in the air or another gas. However, in this specification, the terms “aerosol” and “vapor” may be used interchangeably, especially in reference to the form of an inhalable medium generated for the user’s inhalation.

[0026] Figure 1 shows an aerosol generating device 2 according to an embodiment of the present invention. The aerosol generating device 2 is shown in an assembled configuration with exemplary internal components visible. The aerosol generating device 2 is a non-combustion heating device, sometimes called a tobacco vapor device, and includes a heating device 4 configured to receive an aerosol substrate, such as a rod of aerosol generating material (e.g., tobacco). The aerosol generating device 2 may include a power source, such as a battery, and a control circuit that controls the power supply from the power source to the heating device 4. The heating device 4 is operable to heat the rod of aerosol generating material without combustion to generate vapor or aerosol for the user to inhale. Of course, as will be understood by those skilled in the art, the aerosol generating device 2 shown in Figure 1 is only one example of an aerosol generating device according to the present invention. Other types and configurations of tobacco vapor products, vaporizers, or e-cigarettes may also be used as aerosol generating devices according to the present invention.

[0027] Figure 2A shows a schematic diagram of a heating device 10 having a heating cup 12 and an outer wall 14. The insulation of the heating device 10 is provided by the wall 16 of the heating cup 12, which functions as the inner wall of the insulation, and the outer wall 14 is the outer wall of the insulation. The heating cup wall 16 is set away from the outer wall 14 to provide an insulating space 18, which may be a vacuum or filled with an insulating material such as air, aerogel, or fibrous insulation. As will be understood by those skilled in the art, the term “vacuum” means a space where the pressure is considerably lower than atmospheric pressure due to the removal of free matter (especially air). The quality of the vacuum formed between the inner wall 16 and the outer wall 14 may be low vacuum, medium vacuum, or high vacuum.

[0028] The heater cup 12 is closed at a bottom end 19 that is separated from the open end 20 of the heater cup 12, limiting the insertion depth of the consumable. In this example, the outer wall 14 has an open end 22 through which the heater cup 12 is received. The outer wall 14 may be part of a cup or sleeve, which will be described with reference to Figures 3 and 4. Thus, the heater cup 12 is radially positioned within the inner surface of the outer wall 14.

[0029] The heater cup 12 and outer wall 14 may be substantially cylindrical in shape, so that when viewed from above or below (i.e., parallel to the longitudinal axis of the heater cup 12 and outer wall 14), the heater cup 12 and outer wall 14 appear concentric (not shown). In alternative examples, the heater cup 12 and / or outer wall 14 may be formed in other types of cross-sectional shapes (e.g., square or polygon). As seen in Figures 2A and 2B, the open end 20 of the heater cup 12 may have a circumference or outer circumference larger than the inner wall 16 (i.e., the wall of the heater cup), and there may be a tapered cone portion between the wall 16 and the open end 20. This is to facilitate the insertion of consumables / aerosol-forming material (not shown) into the cavity / heating zone of the heating device 10. In another example, the heater cup and the inner wall of the insulator may be separate components, and the heater cup is housed in a cavity defined by the inner wall.

[0030] The open end 20 of the heater cup 12 is connected to the open end 22 of the outer wall 14, and this connection is made by welding a bridge 24 between the two open ends. The bridge 24 may be formed from the material of the inner wall 16 and the outer wall 14, or alternatively, from a welding filler. Naturally, the inner wall 16 and the outer wall 14 may each contain a metallic material that can be welded to each other or to a separate bridge material, or alternatively, their walls may contain a glass material that is laser-welded to the bridge material. The connection of the bridge 24 seals the space 18 between the inner wall and the outer wall, and the space 18 may contain a vacuum or be filled with an insulating material. Thus, the bridge 24 surrounds or encloses the open end 20 of the heater cup 12 and is loop-shaped or ring-shaped.

[0031] Figure 2B shows an exploded view of the upper end of the heating device 10 and the bridge connection, indicated by the ellipse 26 in Figure 2A. As can be seen from the figure, the bridge 24 is thick such that the longitudinal thickness 28 of the heating device 10 provides structural integrity for accommodating a vacuum or insulating material. For example, the ends of the bridge 24 should be sufficiently bonded or welded to the respective inner or outer walls. In other words, the thickness of the bridge 24 (sometimes called a weld ring or connecting ring) must be sufficient to ensure that there is enough surface area available to weld the inner and outer walls to the bridge 24. In addition, the thickness of the bridge 24 must be sufficient to prevent it from collapsing on its own (for example, under vacuum pressure).

[0032] It has been found that the thickness 28 of the bridge 24 can be reduced to a predetermined minimum thickness 30 in order to reduce the amount of thermally conductive welding material / bridge material while ensuring the structural and physical integrity of the bridge 24. As will be understood by those skilled in the art, the predetermined minimum thickness 30 of the bridge 24 may vary depending on the quality of the vacuum or insulation material provided between the inner wall 16 and the outer wall 14. The predetermined minimum thickness 30 of the bridge 24 may also vary depending on the material of the bridge 24.

[0033] Grooves 32 are cut into the material of the bridge 24 to reduce the thickness 28 of the bridge to a predetermined minimum thickness 30. This may be done by grinding, cutting, or other machining methods in the art. As shown in Figure 2B, a V-shaped groove 32 is cut into the underside of the bridge 24. However, any shape of groove 32 may be used, and grooves 32 may also be cut into the upper side of the bridge 24 if required by the design or manufacturing process. In another example, grooves may be cut into both the upper and lower sides of the bridge 24 to obtain a predetermined minimum thickness 30. Importantly, reducing the amount of material of the bridge 24 between the inner wall 16 and the outer wall 14 to the minimum thickness in the longitudinal direction of the bridge 24 is to introduce a thermal break against heat loss or transfer from the heater cup 12 / heating zone of the heating device 10.

[0034] Figure 3 shows a schematic diagram of a heating device 50 having an inner cup 52 and an outer cup 54. The heating device 50 includes an insulating body including an inner wall 56 and an outer wall 58, which are the walls of the inner cup 52 and the outer cup 54, respectively. The inner wall 56 also defines an opening 60 through which aerosol-forming material (consumables) can be received into the heating zone 62 of the heating device 50. The inner cup 52 is made of a metallic material (e.g., stainless steel) having good thermal conductivity. The opening 60 serves as an insertion point when inserting consumables into the heating device 50 in an assembled form. The bottom of the inner cup 52 is closed to limit the insertion depth of the consumables. The outer cup 54 is made of a metallic material (e.g., steel or stainless steel) and also has a closed end. The inner cup 52 and the outer cup 54 may also be made of other materials such as glass.

[0035] The inner cup 52 is radially positioned within the inner surface of the outer cup 54. The inner cup 52 and / or the outer cup 54 may have a circular cross-section, or may be formed with other types of cross-sectional shapes (e.g., square or polygonal).

[0036] In this example, the inner cup 52 has a lip 64 at its open end. The lip 64 faces outward toward the outer cup 54. Naturally, the lip 64 is an optional shape and may be omitted due to design or manufacturing limitations.

[0037] The heating device 50 further includes a bridge 66 as a welded connection between the inner cup 52 and the outer cup 54. Thus, the bridge 66 surrounds the open end of the inner cup 52 in a loop or ring shape, sealing the insulating space 67 between the outer surface of the inner cup 52 and the inner surface of the outer cup 54, thereby creating an insulating body. The space 67 may be filled with vacuum or another insulating material.

[0038] As described above with reference to Figures 2A and 2B, the bridge 66 may be formed using the same materials as the inner cup 52 and the outer cup 54, or by using a weld filler. The bridge 66 has a thickness in the longitudinal direction of the heating device 50 sufficient to achieve structural integrity and ensure an effective bond with the inner cup and the outer cup, respectively.

[0039] The bridge 66 includes a groove 68, which is cut into the material of the bridge 66, reducing the thickness of the bridge 66 at the location of the groove 68. This may be done by grinding or cutting, or by another machining method in the art. As can be seen from Figure 3, a V-shaped groove 68 is cut into the upper surface of the bridge 66 to achieve a predetermined minimum thickness of the bridge material at the apex of the groove 68. However, grooves of any shape may be used, and depending on the design or manufacturing process, the groove may be cut into the upper surface of the bridge. In this way, a thermal break is provided against heat loss or transfer from the inner cup 52 / heating zone 62 of the heating device 50 by reducing the amount of material of the bridge 66 to a predetermined minimum thickness in the longitudinal direction of the bridge 66 at the apex of the groove between the inner wall 56 and the outer wall 58.

[0040] In Figure 3, a heater 70 is provided on the outer surface of the inner cup 52 (i.e., the heater is located within the insulated space 67). The heater 70 is an electrically resistive track that may be printed or coated onto the inner cup 52. Alternatively, the heater 70 may be laminated on the inner cup 52. Wires 72 connect the heater 70 to a power supply or a printed circuit board assembly (PCBA) (not shown). The heating device 50 also optionally includes thermocouple or thermistor wires 74 connected to the PCBA to monitor and / or control the temperature of the heater 70. The wires 72 and thermocouple / thermistor wires 74 may pass through holes at the bottom of the outer cup 54 (these holes may then be properly sealed). Alternatively, if the outer cup contains glass material, the wires may be molded into the bottom end.

[0041] Figure 4 shows another schematic diagram of a heating device 90 having an inner sleeve 92 and an outer sleeve 94. The inner sleeve 92 includes the inner wall of the heating device 90, which defines an opening 96 through which consumables can be received into the heating zone 98 of the heating device 90. The opening 96 serves as an insertion point when inserting consumables into the heating device 90 in its assembled form, and the inner sleeve 92 includes a metallic material having good thermal conductivity.

[0042] The outer sleeve 94 includes the outer wall of the heating device 90 and may be made of a metal material (e.g., steel or stainless steel) that is easily formed into a tubular or cylindrical shape. The inner sleeve 92 is radially positioned within the inner surface of the outer sleeve 94. The insulator of the heating device 90 includes a vacuum or an insulating space 99 between the inner sleeve 92 and the outer sleeve 94. The inner and outer sleeves may include a material other than metal (e.g., glass).

[0043] The inner sleeve 92 has an upper lip 100 and a lower lip 102 at its upper and lower ends, respectively. The upper lip 100 and the lower lip 102 face outward toward the outer sleeve 94. As described with reference to Figure 3, each lip of the inner sleeve 92 is of an arbitrary shape.

[0044] The inner sleeve 92 optionally includes a plug 104 positioned within the inner sleeve 92 to act as a contact point for the consumable being inserted. The plug 104 may be ring-shaped (i.e., may have an aperture that allows airflow across the plug 104), or alternatively, may be a solid block that blocks airflow.

[0045] The heating device 90 further includes a bridge 106 welded between the inner sleeve and the outer sleeve at the upper and lower ends of the sleeve. Thus, the bridge 106 surrounds each open end of the inner sleeve 92 in a loop or ring shape, sealing the space 99 between the outer surface of the inner sleeve 92 and the inner surface of the outer sleeve 94. As described above with reference to Figures 2 and 3, the bridge 106 may be formed using the sleeve material or by using a welding filler.

[0046] Each bridge 106 has a thickness 108 in the longitudinal direction of the heating device 90 sufficient to achieve structural integrity and ensure effective bonding with the inner and outer sleeves, respectively. Each bridge 106 also includes a groove 110, which is cut into the material of the bridge 106, reducing the thickness of the bridge 106 at the location of the groove 108.

[0047] As can be seen in Figure 4, a U-shaped groove 108 is cut into the outer surface of the bridge 106 to achieve a predetermined minimum thickness of the bridge material. However, grooves of any shape may be used, and depending on the design or manufacturing process, grooves may be cut into any surface of the bridge. In this way, by reducing the amount of material of the bridge 106 between the inner sleeve 92 and the outer sleeve 94 to a predetermined minimum thickness in the longitudinal direction of the bridge 106, a thermal break is provided to prevent heat loss or transfer from the heating zone 98 of the heating device 90.

[0048] The heating device 90 includes a heater or heating element 112, a wire 114, and a thermistor wire 116, similar to those described with reference to the heating device 50 in Figure 3. The heating element 112 is provided on the outer surface of the inner sleeve 92 within the insulating space 99 (between the inner sleeve and the outer sleeve). The heating element may be an electrically resistive track that may be printed or coated on the inner sleeve 92. Alternatively, the heater 112 may be laminated on the inner sleeve 92.

[0049] The wire 114 connects the heating element 112 to a power source or PCBA (not shown). The thermocouple or thermistor wire 116 is connected to the PCBA to monitor and / or control the temperature of the heating element 112. In this example, the wire 114 passes through the lower lip 102 of the inner sleeve 92, away from the lower weld bridge 110. However, other designs and arrangements of the wire 114 within the heating device 90 will be apparent to those skilled in the art. The thermocouple / thermistor wire 116 may pass through holes in the plug 104 (these holes may then be properly sealed). Alternatively, if the plug 104 contains glass material, the thermistor wire 116 may be molded into the plug 104.

Claims

1. A heating device for an aerosol generating device, An insulating body including an inner wall and an outer wall, wherein the inner wall defines a heating zone and includes an opening, allowing an aerosol-forming material to be received into the heating zone through the opening, and the outer wall is arranged radially outward with respect to the inner wall. The insulating body further includes a welded bridge connecting the inner wall and the outer wall, the welded bridge including a groove, A heating element is disposed on the inner wall and configured to heat the received aerosol-forming material, A heating device that includes a heating device.

2. The heating device according to claim 1, wherein the welded bridge is a loop, preferably a ring.

3. The heating apparatus according to claim 1 or 2, wherein the welding bridge includes a predetermined minimum thickness.

4. The heating apparatus according to claim 1, 2, or 3, wherein the welded bridge includes a filler material.

5. The heating device according to any one of claims 1 to 4, wherein the surface of the outer wall is positioned at least a predetermined distance from the surface of the inner wall.

6. A heating device according to any one of claims 1 to 5, wherein a vacuum is sealed between the inner wall and the outer wall.

7. The heating apparatus according to any one of claims 1 to 5, wherein the insulating body further includes an insulating material between the inner wall and the outer wall.

8. A heating apparatus according to any one of claims 1 to 7, further comprising a heating cup, the heating cup comprising an inner wall and an end that limits the insertion depth of the received aerosol-forming material.

9. A heating device according to any one of claims 1 to 7, further comprising a heating sleeve, wherein the heating sleeve includes the inner wall.

10. The heating device according to any one of claims 1 to 9, wherein the heating element is provided between the inner wall and the outer wall.

11. The heating device according to any one of claims 1 to 10, wherein the heating element includes an electrically resistive track printed or coated on the inner wall, or wrapped around the inner wall.

12. The heating device according to any one of claims 1 to 11, further comprising one or more wires configured to connect the heating element to a power source capable of supplying power to the heating element.

13. The heating device according to any one of claims 1 to 12, further comprising a thermocouple cable and / or thermistor wire configured to connect the heating element to a control circuit.

14. An aerosol generating device configured to generate an aerosol for a user to inhale, comprising a heating device according to any one of claims 1 to 13.

15. A method for manufacturing a heating apparatus according to any one of claims 1 to 13, A step of defining a heating zone by providing an inner wall, wherein the inner wall includes an opening, and an aerosol-forming substance can be received into the heating zone through the opening; A step of arranging a heating element on the inner wall, wherein the heating element is configured to heat the received aerosol-forming material, The steps include providing an outer wall radially outward with respect to the inner wall, The steps include welding a bridge connecting the inner wall and the outer wall to seal the inner wall and the outer wall, The step of cutting a groove into the aforementioned bridge, A method that includes this.

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