Aerosol generating device and associated aerosol generating assembly with a flattened heating chamber

Abstract

The present invention relates to an aerosol generation device (11) comprising a heating chamber (50) extending along a chamber axis between a closed end (51) and an open end (52), the heating chamber (50) being flattened and configured to receive a flattened shaped tobacco article (12) through its open end (52), defining a first portion adjacent the closed end (51) and a second portion adjacent the open end (52), the heating chamber (50) comprising at least two chamber contacting walls (54A, 54B) facing each other and extending through both portions of the heating chamber (50), the chamber contacting walls (54A, 54B) being arranged such that the distance between the walls in the second portion of the heating chamber (50) is greater than the distance between the walls in the first portion of the heating chamber (50).

Description

Technical Field

[0001] The present invention relates to an aerosol generating device comprising a flat heating chamber. The present invention also relates to an aerosol generating assembly comprising such an aerosol generating device.

[0002] In particular, the aerosol generating device according to the present invention is configured to operate with a flat tobacco article comprising a solid substrate capable of forming an aerosol when heated, for example. Thus, such a type of aerosol generating device, also known as a heat-not-burn device, is adapted to heat rather than burn the substrate, by conduction, convection, and / or radiation, to generate an aerosol for inhalation.

Background Art

[0003] The popularity and use of risk reduction devices or risk modification devices (also known as vaporizers) has grown rapidly in recent years as an aid to assist habitual smokers who wish to quit smoking conventional tobacco products such as cigarettes, cigars, cigarillos, and rolled tobacco. In contrast to burning tobacco in conventional tobacco products, various devices and systems are available for heating or warming vaporizable substances.

[0004] Commonly available risk reduction or risk modification devices are substrate-heated aerosol generators or heated non-combustion devices. These types of devices typically generate aerosols or vapors by heating an aerosol substrate, usually containing moist tobacco leaves or other suitable vaporizable material, to a temperature typically in the range of 150°C to 350°C. By heating the aerosol substrate rather than burning or incinerating it, an aerosol is released that contains the components desired by the user but does not contain toxic and carcinogenic by-products from combustion and incineration. Furthermore, aerosols generated by heating tobacco or other vaporizable materials typically do not contain the burnt or bitter taste resulting from combustion and incineration, which can be unpleasant for the user. Therefore, the substrate does not require sugars and other additives that are typically added to such materials to make the smoke and / or vapor more palatable to the user.

[0005] Some aerosol generating devices can operate with flattened tobacco articles of reduced size. In some cases, the depth of such articles can be between 0.5 and 2 mm. Heating efficiency for these articles can be extremely difficult. In particular, ensuring that the articles adhere tightly to the heater while allowing for easy insertion and removal by the user is not always achievable. [Overview of the project] [Problems that the invention aims to solve]

[0006] One of the objectives of the present invention is to provide an aerosol generating device that ensures high heating efficiency and allows users to easily insert and remove it. [Means for solving the problem]

[0007] For this purpose, the present invention provides an aerosol generating device comprising a heating chamber extending along the chamber axis between a closed end and an open end, The heating chamber is flattened and configured to receive flattened tobacco articles through its open end, and is divided into a first portion adjacent to the closed end and a second portion adjacent to the open end. The heating chamber comprises at least two chamber contact walls that face each other and extend through both parts of the heating chamber, The chamber contact walls relate to an aerosol generating device in which the distance between these walls in a second part of the heating chamber is greater than the distance between these walls in a first part of the heating chamber.

[0008] Due to these features, only a portion of the flattened tobacco article can be compressed, ensuring a tight seal with the chamber contact wall. Therefore, the flattened tobacco article may be compressed and heated only when necessary, thus avoiding heat waste and improving heating efficiency. In addition, since the flattened tobacco article is not compressed along its entire length, its insertion and removal may be particularly easy for the user.

[0009] According to some embodiments, a first portion of the heating chamber is designed to receive the base portion of the tobacco article, and a second portion of the heating chamber is designed to receive at least partially the cooling portion of the tobacco article.

[0010] Due to these characteristics, only the base portion of the flattened tobacco article can be in close contact with the chamber contact wall, while its cooling portion can be separated from the chamber contact wall. Consequently, heat exchange in the cooling portion of the article is reduced, making cooling more efficient and avoiding unnecessary heat waste.

[0011] According to some embodiments, the chamber contact wall is designed to contact at least half, preferably at least three-quarters, of the entire external area of ​​the base material portion of the tobacco article.

[0012] Due to these characteristics, the base material of flat-shaped tobacco articles can be heated efficiently.

[0013] According to some embodiments, the chamber contact wall is designed to be spaced away from at least half, preferably at least three-quarters, of the entire external area of ​​the cooling section for the tobacco article.

[0014] These features make it possible to minimize heat exchange between the chamber contact wall and the cooling section of the tobacco article, thereby increasing cooling efficiency.

[0015] According to some embodiments, each chamber contact wall has a plane designed to face the tobacco article.

[0016] According to some embodiments, each chamber contact wall forms a non-zero angle with respect to the chamber axis.

[0017] These features make it possible to reliably reduce the cross-sectional shape of the portion adjacent to the closed end of the heating chamber.

[0018] According to some embodiments, the chamber contact wall extends from the closed end to the open end of the heating chamber so as to form a V-shape.

[0019] Due to these features, the chamber contact walls can be manufactured and assembled particularly easily. In addition, it is possible to ensure that the non-uniform compression rate of the base material of the tobacco article is maintained.

[0020] According to some embodiments, in a first portion of the heating chamber, the chamber contact wall extends parallel to the chamber axis.

[0021] These features ensure a uniform compression ratio throughout the base material of the tobacco product, while avoiding compression of the cooling section.

[0022] According to some embodiments, in the second portion of the heating chamber, the distance between the chamber contact walls gradually increases from the end adjacent to the first portion to the open end of the heating chamber.

[0023] According to some embodiments, in the second part of the heating chamber, the chamber contact wall forms a curved shape.

[0024] Due to these features, the insertion of the tobacco article by the user can be easily performed because the substrate part thereof is continuously compressed as the heating chamber gradually narrows.

[0025] According to some embodiments, in each part of the heating chamber, each chamber contact wall presents a plane designed to face the tobacco article. Additionally, or alternatively, the planes of each chamber contact wall form a non-zero angle between the first part and the second part.

[0026] Due to these features, it is possible to ensure a uniform compression rate throughout the substrate part of the tobacco article and avoid compression in the cooling part.

[0027] According to some embodiments, the heating chamber forms a rectangular cross-sectional shape.

[0028] According to some embodiments, at least one chamber contact wall is a heating wall.

[0029] Due to these features, the substrate part of the tobacco article can be directly heated by one or more chamber contact walls. Additionally, when heating the walls, the heating can be performed according to the same heating profile or different heating profiles. This can improve the heating efficiency and user experience during the vaping session.

[0030] According to some embodiments, the heating chamber forms a cup shape. For example, the closed end may define the bottom of the cup-shaped heating chamber, particularly facing the open end.

[0031] According to some embodiments, the heating chamber includes a pair of parallel chamber side walls extending along the chamber axis. For example, the distance between the chamber side walls may be 3 to 10 times greater than any distance between the chamber contact walls.

[0032] According to some embodiments, the chamber contact wall and the chamber side wall are firmly fixed to each other. For example, the chamber contact wall and / or the chamber side wall are fixed so as not to move relative to each other.

[0033] According to some embodiments, the chamber contact wall may form a continuous derivable curve in a cross-section with respect to the chamber axis. In other words, for example, the chamber contact wall may lack steps and / or portions extending in a plane perpendicular to the chamber axis.

[0034] The present invention also relates to an aerosol generating assembly comprising a flattened tobacco article and an aerosol generating device as defined above, wherein the aerosol generating device is adapted to operate with the flattened tobacco article.

[0035] The present invention and its advantages are given only as non-limiting examples and will be better understood by reading the following description, which is based on reference to the accompanying drawings. [Brief explanation of the drawing]

[0036] [Figure 1] This is a perspective view of an aerosol generating assembly according to the present invention, the aerosol generating assembly comprising an aerosol generating device according to the present invention and a flat-shaped tobacco article that can be used together with the aerosol generating device, the aerosol generating device comprising a heating chamber. [Figure 2] Figure 1 is a perspective view of a flattened tobacco product. [Figure 3] This is a partial cross-sectional view following Plane III in Figure 1, and the heating chamber is according to the first embodiment of the present invention. [Figure 4] This is a partial cross-sectional view following Plane IV of Figure 1, and the heating chamber is according to a second embodiment of the present invention. [Figure 5] Figure 1 is a partial cross-sectional view following the plane V, and the heating chamber is according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0037] Before describing the present invention, it should be understood that the present invention is not limited to the structural details described below. It will be apparent to those skilled in the art who benefit from this disclosure that other embodiments are possible and that the invention can be implemented or carried out in various ways.

[0038] As used herein, the terms “aerosol generating device” or “device” may include a vaping device that delivers an aerosol to a user, including an aerosol for vaping, using a heater element which is described in more detail below. The device may be portable. “Portable” may mean a device used when held by a user. The device may be adapted to generate a variable amount of aerosol (as opposed to a fixed amount of aerosol) by activating a heater element for a variable amount of time, for example, and this may be controlled by a trigger. The trigger may be user-activated, such as a vaping button and / or an inhalation sensor. The inhalation sensor may be highly sensitive to inhalation intensity and duration, and may enable the delivery of a variable amount of vapor (to mimic the smoking effect of conventional flammable smoking articles such as cigarettes, cigars, or pipes). The device may include a temperature control unit for driving the temperature of the heater and / or heated aerosol generating material (aerosol precursor) to a specific target temperature and then maintaining the temperature at the target temperature to enable efficient aerosol generation.

[0039] As used herein, the term “aerosol” may include a suspension of a vaporizable material as one or more solid particles, droplets, or gases. The suspension may be in a gaseous state, including air. In general, the aerosol as used herein refers to or may include vapor. The aerosol may include one or more components of the vaporizable material.

[0040] As used herein, the terms “vaporizable material” or “precursor” may refer to a smokeable material and an aerosol-forming agent, which may, for example, comprise nicotine or tobacco. Tobacco may take the form of various materials, such as shredded tobacco, granular tobacco, tobacco leaves, and / or reconstituted tobacco. Suitable aerosol-forming agents include polyols (e.g., sorbitol, glycerol, and glycols such as propylene glycol or triethylene glycol) and non-polyols (e.g., monohydric alcohols, acids such as lactic acid, glycerol derivatives, esters such as triacetin, triethylene glycol diacetate, triethyl citrate, glycerin, or vegetable glycerin). In some embodiments, the aerosol-generating agent may be glycerol, propylene glycol, or a mixture of glycerol and propylene glycol. The substrate may also contain at least one of a gelling agent, a binder, a stabilizer, and a humectant.

[0041] Figure 1 shows an aerosol generating assembly 10 comprising an aerosol generating device 11 and a flat-shaped tobacco article 12, hereafter referred to as tobacco article 12. The aerosol generating device 11 is intended to operate in conjunction with the flat-shaped tobacco article 12, which is shown in more detail in Figure 2.

[0042] Referring to Figure 2, the cigarette article 12 is, for example, a flattened cube extending along the article axis X and having external dimensions L × W × D. In a typical embodiment, the length L of the cigarette article 12 along the article axis X is approximately equal to 33 mm, while its width W and depth D are approximately equal to 12 mm and 1.2 mm, respectively. According to a different embodiment, the values ​​L, W, and D can be selected within, for example, a range of ±40%. The depth D of the cigarette article 12 is formed by a pair of parallel walls 13A, 13B, hereafter referred to as article side walls 13A, 13B, and the width W of the cigarette article 12 is formed by a pair of parallel walls 14A, 14B, hereafter referred to as article contact walls 14A, 14B. According to other embodiments of the present invention, the cigarette article 12 may have any other suitable shape and / or external dimensions. For example, the cigarette article 12 may form a circular tubular shape.

[0043] The tobacco article 12 comprises a base portion 15 and a cooling portion 16 arranged along the article axis X. The base portion 15 may be, for example, slightly longer than the cooling portion 16. For example, the length L2 of the base portion 15 along the article axis X may be approximately equal to 18 mm, and the length L1 of the cooling portion 16 along the article axis X may be approximately equal to 15 mm. The base portion 15 defines the contact end 18 of the tobacco article 12, and the cooling portion 16 defines the mouth end 20 of the tobacco article 12. The base portion 15 and the cooling portion 16 may be secured to each other by a specific wrapper extending around the article axis X. In other embodiments, portions 15, 16 may be wrapped by different wrappers and secured to each other by any other suitable means. The wrappers or each wrapper may comprise, for example, paper and / or nonwoven fabric and / or aluminum. The wrappers or each wrapper may be porous or air-impermeable. The wrapper, or each wrapper, forms a plurality of airflow channels that extend inward into the tobacco article 12 between the contact end 18 and the mouth end 20.

[0044] The base material 15 is intended to be heated by one or more heaters (in this embodiment, a heating chamber is used) and comprises a vaporizable material as defined above. According to a different embodiment of the present invention, the cooling section 16 is intended to be received partially inside the mouthpiece and partially inside the heating chamber, as will be described in more detail below. According to another embodiment of the present invention, at least a portion of the cooling section 16 adjacent to the mouth-side end 20 forms a mouthpiece that is intended to come into contact with the user's mouth and / or lips. The cooling section 16 comprises a core 17 that functions, for example, as a filter and / or vapor cooling means. The core 17 may be, for example, a foam or packed strand or fiber. The core 17 may be formed into a stable shape by an extrusion and / or rolling process. In a particular embodiment (not shown), the cooling section 16 defines a plurality of vents arranged along the entire perimeter of the cooling section 16, for example, along two axes perpendicular to the article axis X. In other words, according to this embodiment, the vents are located on each of the article side walls 13A, 13B and article contact walls 14A, 14B of the tobacco article 12. According to another embodiment, the vents are located only on the article contact walls 14A, 14B, or preferably only on one of the article contact walls 14A, 14B. In both embodiments, the vents may be aligned perpendicular to the article axis X on the corresponding walls of the tobacco article 12 or on each wall, and may be spaced the same distance apart. The vents allow fresh air to enter the inside of the tobacco article 12 to achieve a specific vaping / tasting effect. In a preferred embodiment, no vents are provided.

[0045] Referring again to Figure 1, the aerosol generating device 11 comprises a device body 40 extending along the device axis Y. The device body 40 comprises a mouthpiece 42 and a housing 44 arranged continuously along the device axis Y. According to the embodiment of Figure 1, the mouthpiece 42 and the housing 44 form two different parts. In particular, according to this embodiment, the mouthpiece 42 is designed to be fixed onto or received in an insertion opening formed on one end of the housing 44. In this case, the tobacco article 12 can be inserted into the device 11 when the mouthpiece 42 is removed from the housing 44. According to another embodiment (not shown), the mouthpiece 42 and the housing 44 form a single part. In this case, the tobacco article 12 can be inserted into the device 11, for example, through an outlet. According to both embodiments, the mouthpiece 42 defines a through-hole that is adapted to receive at least a portion of the tobacco article 12. In particular, the through-hole can be adapted to receive at least a portion of the cooling portion 16 of the tobacco article 12, as shown in Figure 1.

[0046] The housing 44 partitions the internal space of the device 11, which accommodates various elements designed to perform different functions of the device 11. This internal space can accommodate, for example, a battery for supplying power to the device 11, a control module for controlling the operation of the device 11, a heating chamber for heating the base material 15 of the tobacco article 12, and so on. Of these elements, only the heating chamber according to a different embodiment of the present invention will be described in more detail with reference to Figures 3-5. First Embodiment of the Present Invention Figure 3 shows a cross-section of the aerosol generating device 11 without the mouthpiece 42, according to planar III of Figure 1. As shown in this figure, the aerosol generating device 11 includes a heating chamber 50 that extends along the chamber axis between a closed end 51 and an open end 52. In the embodiment of Figure 3, the chamber axis coincides with the device axis Y.

[0047] As shown in Figure 3, the heating chamber 50 can have a cup shape adapted to receive the base portion 15 and at least partially the cooling portion 16 of the tobacco article 12. Depending on different embodiments of the present invention, the tip of the cooling portion 16 protruding from the heating chamber 50 can be received in a through-hole of the mouthpiece 42 or is intended to contact the user's lips and / or mouth. Similar to the tobacco article 12, the heating chamber 50 may also have a rectangular cross-sectional shape and may comprise a pair of parallel chamber sidewalls (not shown in Figure 3) extending along the chamber axis and a pair of chamber contact walls 54A, 54B designed to partially contact the article contact walls 14A, 14B, as will be described in more detail below. According to different embodiments of the present invention, the chamber sidewalls may be in contact with or spaced apart from the article sidewalls 13A, 13B. In addition, similar to the tobacco article 12, the heating chamber 50 is flattened, meaning that the distance between its sidewalls is much greater than any distance between its contact walls 54A, 54B, for example, 3 to 10 times greater.

[0048] The heating chamber 50 may also have a bottom wall (not shown in Figure 3) adjacent to each of the walls and extending perpendicularly to the chamber axis at the closed end 51. In a modified example, the closed end 51 of the chamber 50 is formed by a narrow portion between its side walls and / or contact walls so as to abut against the contact end 18 of the tobacco article 12 while the tobacco article 12 is inserted into the chamber 50. The heating chamber 50 also defines an opening 60 at its open end 52 suitable for inserting the tobacco article 12.

[0049] Each of the chamber contact walls 54A, 54B, or at least one of these walls, may be a heating wall. In particular, such a heating wall may comprise, or be in contact with, a heating element connected to the battery of the device 11 and controlled by the control module of the device 11 to heat the tobacco article 12. The heating element may extend substantially along the entire surface of the heating wall, or along only a portion of this surface. The heating element may be formed by a ceramic heater, a polyimide film heater, or any other suitable heater. If both contact walls 54A, 54B are heating walls, the corresponding heating elements may be controlled by the control module according to the same heating profile or according to different heating profiles.

[0050] According to a first embodiment of the present invention, each of the chamber contact walls 54A, 54B has a plane that faces the tobacco article 12 when the tobacco article 12 is inserted into the chamber 50. In addition, at least one of the chamber contact walls 54A, 54B forms a non-zero angle with the chamber axis such that the distance between these walls at the open end 52 of the chamber 50 is greater than the distance between these walls at the closed end 52 of the chamber 50. For example, the chamber contact walls 54A, 54B can be arranged symmetrically with respect to the chamber axis to form a V-shaped chamber 50. The non-zero angle formed by the chamber contact walls 54A, 54B or each chamber contact wall 54A, 54B with the chamber axis may be between 1° and 30°, preferably between 5° and 20°.

[0051] More generally, the non-zero angles formed by the chamber contact walls 54A, 54B or by each chamber contact wall 54A, 54B and the chamber axis are selected such that the chamber 50 defines a first portion adjacent to the closed end 51 and adapted to receive the base portion 15 of the tobacco article 12, and a second portion adjacent to the open end 52 and adapted to receive at least partially the cooling portion 16 of the tobacco article 12, wherein the distance between the chamber contact walls 54A, 54B in the second portion is greater than the distance between these walls 54A, 54B in the first portion.

[0052] In the first portion of the heating chamber 50, the chamber contact walls 54A and 54B are designed to be in contact with at least half, preferably at least three-quarters, of the entire outer area of ​​the base material portion 15 of the tobacco article 12. In this case, at least one end of the base material portion 15 adjacent to the closed end 51 of the chamber 50 may be compressed. In addition, at least one end of the base material portion 15 adjacent to the cooling section 16 may be spaced apart from the chamber contact walls 54A and 54B.

[0053] In the second portion of the heating chamber 50, the chamber contact walls 54A and 54B are designed to be spaced apart from at least half, preferably at least three-quarters, of the entire external area of ​​the cooling section 16 of the tobacco article 12. Second Embodiment of the Present Invention Figure 4 shows a cross-section of the aerosol generating device 11 without the mouthpiece 42, according to planar IV of Figure 1. As shown in this figure, the aerosol generating device 11 includes a heating chamber 150 according to the second embodiment, similar to the heating chamber 50 according to the first embodiment, except for features that will be described in detail below. In particular, as with the heating chamber 50 according to the first embodiment, the heating chamber 150 extends along the chamber axis between the closed end 151 and the open end 152. In addition, as in the previous case, the chamber axis coincides with the device axis Y in the embodiment of Figure 4.

[0054] Furthermore, as in the previous case, the heating chamber 150 according to the second embodiment includes two chamber contact walls 154A and 154B designed to partially contact the tobacco article 12. Also, as in the previous case, the heating chamber 150 is defined as a first portion adjacent to the closed end 151 and adapted to receive the base portion 15 of the tobacco article 12, and a second portion adjacent to the open end 152 and adapted to receive at least partially the cooling portion 15 of the tobacco article 12. The chamber contact walls 154A and 154B are arranged such that the distance between these walls in the second portion of the heating chamber 150 is greater than the distance between these walls in the first portion of the heating chamber 150.

[0055] In contrast to the previous case, the chamber contact walls 154A and 154B extend parallel to the chamber axis in the first portion and at a non-zero angle in the second portion. In particular, in the first portion, the chamber contact walls 154A and 154B may be in contact with substantially the entire external area of ​​the base material portion 15 of the tobacco article 12, and may, in some cases, slightly compress this base material portion 15. In the second portion, the chamber contact walls 154A and 154B may be spaced apart from substantially the entire external area of ​​the cooling portion 15. In addition, in the second portion, the distance between the chamber contact walls 154A and 154B may gradually increase from the end adjacent to the first portion to the open end 152 of the heating chamber 150.

[0056] For this purpose, each chamber contact wall 154A, 154B may have two flattened segments, one of which is positioned parallel to the chamber axis in the first portion and the other in the second portion at a non-zero angle with respect to the chamber axis. The same wall segment may be formed by bending a specific flattened component along a line separating the first and second portions of the heating chamber 152. In a modified example, the same wall segment may be formed by two separate flattened components that are fixed to each other or hinged together. Third Embodiment of the Present Invention Figure 5 shows a cross-section of the aerosol generating device 11 without the mouthpiece 42, according to the plane V of Figure 1. As shown in this figure, the aerosol generating device 11 includes a heating chamber 250 according to the third embodiment, similar to the heating chambers 50 and 150 according to the first and second embodiments, except for features that will be described in detail below. In particular, as with the heating chambers 50 and 150 according to the first and second embodiments, the heating chamber 250 extends along the chamber axis between a closed end 251 and an open end 252. In addition, as in the previous case, the chamber axis coincides with the device axis Y in the embodiment of Figure 5.

[0057] Furthermore, as in the previous case, the heating chamber 250 according to the third embodiment includes two chamber contact walls 254A, 254B designed to partially contact the tobacco article 12. Also, as in the previous case, the heating chamber 250 is defined as a first portion adjacent to the closed end 251 and adapted to receive the base portion 15 of the tobacco article 12, and a second portion adjacent to the open end 252 and adapted to receive at least partially the cooling portion 15 of the tobacco article 12. The chamber contact walls 254A, 254B are arranged such that the distance between these walls in the second portion of the heating chamber 250 is greater than the distance between these walls in the first portion of the heating chamber 250.

[0058] In contrast to the previous case, the chamber contact walls 254A and 254B extend parallel to the chamber axis in the first portion and form a curved shape in the second portion. In particular, in the first portion, the chamber contact walls 254A and 254B may be in contact with substantially the entire outer area of ​​the base material portion 15 of the tobacco article 12, and may, in some cases, slightly compress this base material portion. In the second portion, the distance between the chamber contact walls 254A and 254B may gradually increase from the end adjacent to the first portion to the open end 152 of the heating chamber 150.

[0059] For this purpose, each chamber contact wall 154A, 154B may have a flattened segment in a first portion parallel to the chamber axis and a curved segment located in a second portion. In a second embodiment, the segments may form a single component or two separate components fixed together. Other embodiments of the present invention Other embodiments of the present invention, particularly of the heating chamber, are also possible. Some embodiments may correspond to combinations of the earlier embodiments. For example, in some embodiments, the chamber contact wall may be implemented according to the features described in relation to the different embodiments above.

Claims

1. an aerosol generating device (11) comprising a heating chamber (50;150;250) extending along the chamber axis between a closed end (51;151;251) and an open end (52;152;252), The heating chamber (50; 150; 250) is flattened and configured to receive flattened tobacco articles (12) through its open ends (52; 152; 252), and is divided into a first portion adjacent to the closed ends (51; 151; 251) and a second portion adjacent to the open ends (52; 152; 252). The heating chambers (50; 150; 250) are provided with at least two chamber contact walls (54A, 54B; 154A, 154B; 254A, 254B) that face each other and extend through both portions of the heating chambers (50; 150; 250), The chamber contact walls (54A, 54B; 154A, 154B; 254A, 254B) are arranged such that the distance between these walls in the second portion of the heating chamber (50; 150; 250) is greater than the distance between these walls in the first portion of the heating chamber (50; 150; 250). Aerosol generating device (11).

2. The aerosol generating device (11) according to claim 1, wherein the first portion of the heating chamber (50; 150; 250) is designed to receive the base portion (15) of the tobacco article (12), and the second portion of the heating chamber (50; 150; 250) is designed to receive at least partially the cooling portion (16) of the tobacco article (12).

3. The aerosol generating device (11) according to claim 2, wherein the chamber contact walls (54A, 54B; 154A, 154B; 254A, 254B) are designed to contact at least half of the entire outer area of ​​the base material portion (15) of the tobacco article (12).

4. The aerosol generating device (11) according to claim 2, wherein the chamber contact walls (54A, 54B; 154A, 154B; 254A, 254B) are designed to be spaced apart from at least half of the entire external area of ​​the tobacco article (12) of the cooling section (16).

5. The aerosol generating device (11) according to claim 1, wherein each chamber contact wall (54A, 54B) has a plane designed to face the tobacco article (12).

6. The aerosol generating device (11) according to claim 1, wherein each chamber contact wall (54A, 54B) forms a non-zero angle with respect to the chamber axis.

7. The aerosol generating device (11) according to claim 5, wherein the chamber contact walls (54A, 54B) extend from the closed end (51) to the open end (52) of the heating chamber (50) to form a V shape.

8. In the first portion of the heating chamber (150; 250), the chamber contact walls (154A, 154B; 254A, 254B) extend parallel to the chamber axis, the aerosol generating device (11) according to claim 1.

9. The aerosol generating device (11) according to claim 8, wherein in the second portion of the heating chamber (150; 250), the distance between the chamber contact walls (154A, 154B; 254A, 254B) gradually increases from the end adjacent to the first portion to the open end (152; 252) of the heating chamber (150; 250).

10. The aerosol generating device (11) according to claim 9, wherein in the second portion of the heating chamber (250), the chamber contact walls (254A, 254B) form a curved shape.

11. - In each part of the heating chamber (150), each chamber contact wall (154A, 154B) has a plane designed to face the tobacco article (12), - The planes of each chamber contact wall (154A, 154B) form a non-zero angle between the first portion and the second portion. The aerosol generating device (11) according to claim 9.

12. The heating chambers (50; 150; 250) have a rectangular cross-sectional shape. The heating chambers (50; 150; 250) further include a pair of parallel chamber side walls extending along the chamber axis. The aerosol generating device (11) according to claim 1.

13. The aerosol generating device (11) according to claim 1, wherein at least one chamber contact wall (54A, 54B; 154A, 154B; 254A, 254B) is a heating wall.

14. The aerosol generating device (11) according to claim 1, wherein the heating chambers (50; 150; 250) form a cup shape.

15. An aerosol generating assembly (10) comprising a flattened tobacco article (12) and an aerosol generating device (11) according to any one of claims 1 to 14, wherein the aerosol generating device is adapted to operate together with the flattened tobacco article.

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