Aerosol generating system mouthpiece with condensation management

Abstract

The present invention relates to an aerosol generation system comprising a main unit (40) and a replaceable mouthpiece (10). The main unit comprises a main heating element (52) for heating an aerosol-forming substrate. The mouthpiece comprises an airflow path and an auxiliary heating element (12). The main heating element and the auxiliary heating element are configured to be separately controllable. The aerosol generation system further comprises a controller (72) in electrical communication with the temperature sensor and the auxiliary heating element. The controller is configured to activate the auxiliary heating element in dependence on a temperature sensed by the temperature sensor. The present invention further relates to a mouthpiece for the aerosol generation system.

Description

[Technical field]

[0001] The present disclosure relates to an aerosol generating system. The present disclosure further relates to a mouthpiece for an aerosol generating system. [Background technology]

[0002] It is known to provide an aerosol generating device for generating an inhalable vapor. Such a system may heat the aerosol-forming substrate to a temperature at which one or more components of the aerosol-forming substrate volatilize without burning the aerosol-forming substrate. In an aerosol generating system or device, the liquid aerosol-forming substrate may be delivered from a liquid reservoir to an electric heating element. Upon heating to a target temperature, the aerosol-generating substrate vaporizes to form an aerosol. The liquid substrate may be delivered to the heating element via a capillary element. The liquid reservoir may be formed as a replaceable or refillable cartridge containing the liquid aerosol-forming substrate. The cartridge may be attached to the aerosol generating device to supply the liquid aerosol-forming substrate to the device for aerosol generation. Summary of the Invention [Problem to be solved by the invention]

[0003] When an aerosol generating system is used by a user in a cold environment, the mouthpiece may become uncomfortably cold. Furthermore, the aerosol generated by vaporizing a liquid aerosol-forming substrate may condense on the sidewalls of the airflow path. This may be especially true in cold environments. Therefore, it may be desirable to provide a heater in the mouthpiece of the aerosol generating device.

[0004] It would be desirable to provide an aerosol generating system that can reduce condensation of vaporized aerosol-forming substrate in the airflow path downstream of the heater. It would be desirable to provide an aerosol generating system that can direct condensed aerosol droplets from a location downstream of the heater back toward the heater. It would be desirable to provide an aerosol generating system that has a comfortably warm mouthpiece, regardless of the ambient temperature. [Means for solving the problem]

[0005] According to one embodiment of the present invention, there is provided an aerosol generation system. The aerosol generation system may comprise a main unit and a mouthpiece. The main unit may comprise a main heating element for heating the aerosol-forming substrate. The mouthpiece may comprise an airflow path and an auxiliary heating element.

[0006] According to one embodiment of the present invention, there is provided an aerosol generating system comprising a main unit and a mouthpiece, the main unit comprising a main heating element for heating an aerosol-forming substrate, the mouthpiece comprising an airflow path and an auxiliary heating element.

[0007] By providing an auxiliary heating element in the mouthpiece, an aerosol generation system may be provided that may reduce condensation of vaporized aerosol-forming substrate in the airflow path downstream of the heater. By providing an auxiliary heating element in the mouthpiece, an aerosol generation system may be provided that may direct condensed aerosol droplets from a location downstream of the heater back toward the heater. By providing an auxiliary heating element in the mouthpiece, an aerosol generation system may also be provided that has a comfortably warm mouthpiece, regardless of the ambient temperature.

[0008] The mouthpiece may be replaceable. The replaceable mouthpiece may be disposable. The mouthpiece may be reusable.

[0009] The supplemental heating element may be configured to heat at least a portion of the airflow path of the mouthpiece. The supplemental heating element may be located within the airflow path of the mouthpiece. The mouthpiece may comprise an expansion chamber. The supplemental heating element may be located in the expansion chamber. The mouthpiece may comprise a homogenization chamber. The supplemental heating element may be located in the homogenization chamber.

[0010] The auxiliary heating element may be a resistive heating element.

[0011] The main and supplemental heating elements may be configured to be separately controllable.

[0012] The aerosol generation system may comprise at least one temperature sensor. The aerosol generation system may further comprise a controller in electrical communication with the temperature sensor and the supplemental heating element. The controller may be configured to activate the supplemental heating element in dependence on the temperature sensed by the temperature sensor.

[0013] The temperature sensor may be an ambient temperature sensor. The controller may be configured to activate or deactivate the supplemental heating element depending on temperature information received from the ambient temperature sensor. For example, in a cold environment, the controller may activate the supplemental heating element. For example, in a warm environment, the controller may deactivate the supplemental heating element.

[0014] A temperature sensor may be located in the airflow path of the mouthpiece. The controller may be configured to activate or deactivate the supplemental heating element depending on temperature information received from the temperature sensor located in the airflow path of the mouthpiece. For example, in a cold environment, cold ambient air may be drawn into the airflow path. The sensor may measure an undesirable cold airflow in the airflow path, and the controller may activate the supplemental heating element. When the sensor in the airflow path measures the airflow in the airflow path heating up to a desired temperature due to the action of the supplemental heating element or due to an increase in the ambient temperature, the controller may turn off the supplemental heating element.

[0015] The aerosol generating system may include one or both of a main heating element temperature sensor for measuring a temperature of the main heating element and an auxiliary heating element temperature sensor for measuring a temperature of the auxiliary heating element. The main heating element temperature sensor may be located at or near the main heating element. The main heating element temperature sensor may be configured to estimate a temperature of the main heating element based on a temperature-dependent resistivity of the main heating element. The auxiliary heating element temperature sensor may be located at or near the auxiliary heating element. The auxiliary heating element temperature sensor may be configured to estimate a temperature of the main heating element based on a temperature-dependent resistivity of the auxiliary heating element.

[0016] The controller may be configured to control a temperature profile of the main heating element based on data derived by the main heating element temperature sensor.The controller may be configured to control a temperature profile of the supplemental heating element based on data derived by the supplemental heating element temperature sensor.

[0017] The aerosol generating system may include a controller in electrical communication with the supplemental heating element, the controller being in communication with an external data source, the controller being configured to activate or deactivate the supplemental heating element dependent on temperature information received from the external data source.

[0018] The mouthpiece may include a guiding member disposed in an airflow path of the mouthpiece, the guiding member may be configured to guide condensed liquid components from the airflow in a direction towards the main heating element.

[0019] The surface of the guide member may comprise a hydrophobic material.

[0020] The guide member may be cone-shaped. A tip of the cone-shaped guide member may face in a direction towards the main heating element.

[0021] The longitudinal axis of the cone-shaped guiding member may be disposed parallel to the longitudinal axis of the aerosol generation system, and the base of the cone-shaped guiding member may be oriented toward the proximal end of the aerosol generation system.

[0022] The cone-shaped guiding member may be hollow and may divide the airflow path of the mouthpiece into a downstream airflow chamber disposed within the hollow cone-shaped guiding member and an upstream airflow chamber surrounding the hollow cone-shaped guiding member.

[0023] The hollow cone-shaped guide may comprise one or more openings arranged to fluidly connect the upstream airflow chamber and the downstream airflow chamber. The openings may be arranged irregularly on the hollow cone-shaped guide. This may additionally improve the turbulence of the airflow within the hollow cone-shaped guide.

[0024] The base (widest portion) of the hollow cone-shaped guide member may include an opening configured as an airflow exit port.

[0025] The supplemental heating element may be disposed in the upstream airflow chamber. The upstream airflow chamber may be a homogenization chamber. The downstream airflow chamber may be a homogenization chamber. Both the upstream airflow chamber and the downstream airflow chamber may be homogenization chambers.

[0026] The homogenization chamber may aid in the development of the aerosol after the initial event of vaporization. The homogenization chamber may aid in creating turbulence. A more homogenized distribution of the volatilized particles in the aerosol may be achieved. A more homogenized size of the volatilized particles in the aerosol may be achieved.

[0027] The main unit may comprise a liquid reservoir for containing the liquid aerosol-forming substrate. The main heating element may be configured to heat the liquid aerosol-forming substrate.

[0028] The aerosol generating system may comprise a cartridge for storing the aerosol-forming substrate. The cartridge may comprise a liquid storage portion. The main unit may comprise a body and a replaceable cartridge. The body may comprise control electronics and a power supply. The body may comprise a main heating element, or the cartridge may comprise a main heating element and a liquid storage portion. The mouthpiece may be removably attached to the cartridge. The cartridge may be removably attached to the body.

[0029] The system may be a three-part system, where one end of the cartridge is removably attachable to the body and the other end of the cartridge is removably attachable to the mouthpiece.The system may be a three-part system, where the mouthpiece is removably attachable to the body and the cartridge is removably attachable to or removably insertable into the body.

[0030] The system may be a two-part system, where the cartridge and the mouthpiece form an integral part that is removably attachable to the body.The system may be a two-part system, where the body and the cartridge form an integral part that is removably attachable to the mouthpiece.

[0031] The term "aerosol-forming substrate" as used herein relates to a substrate capable of releasing one or more volatile compounds capable of forming an aerosol. Such volatile compounds may be released by heating the aerosol-forming substrate. The aerosol-forming substrate may conveniently be part of a cartridge. The cartridge may be configured to be replaceable or refillable.

[0032] The aerosol-forming substrate may be provided in liquid form. The liquid aerosol-forming substrate may include an aerosol former, such as propylene glycol or glycerin, other additives and ingredients (such as flavorings). The liquid aerosol-forming substrate may include water, a solvent, ethanol, a plant extract, and a natural or artificial flavor. The liquid aerosol-forming substrate may include an alkaloid or a cannabinoid. The liquid aerosol-forming substrate may include nicotine. The liquid aerosol-forming substrate may have a nicotine concentration of about 0.5% to about 10% (e.g., about 2%). The liquid aerosol-forming substrate may be contained in a liquid storage portion of the aerosol-generating article, in which case the aerosol-generating article may be displayed as a cartridge. The aerosol-forming substrate may include an aerosol former that facilitates the formation of a stable aerosol of high density. Suitable aerosol formers are well known in the art and include, but are not limited to, polyhydric alcohols (such as triethylene glycol, 1,3-butanediol, glycerin, etc.), esters of polyhydric alcohols (such as glycerol monoacetate, diacetate, or triacetate), and aliphatic esters of mono-, di-, or polycarboxylic acids (such as dimethyl dodecanedioate, dimethyl tetradecanedioate, etc.). The aerosol former may be a polyhydric alcohol or a mixture thereof (such as triethylene glycol, 1,3-butanediol, glycerin, etc.). The aerosol former may be propylene glycol. The aerosol former may include both glycerin and propylene glycol.

[0033] As used herein, "aerosol generating system" refers to a system comprising a main unit and a cartridge containing an aerosol-forming substrate. The main unit may be an aerosol generating device.

[0034] As used herein, "aerosol-generating device" refers to a device that generates an aerosol by interacting with an aerosol-forming substrate. The aerosol-forming substrate may be provided in a cartridge. The aerosol-generating device may include a housing, an electrical circuit, a power source, a heating chamber, and a heating element.

[0035] The electrical circuit may comprise a microprocessor, which may be a programmable microprocessor. The microprocessor may be part of a controller. The electrical circuit may comprise further electronic components. The electrical circuit may be configured to regulate the supply of power to the heater element.

[0036] The main heating element is preferably provided as part of the vaporization unit. The main heating element may be any device suitable for heating the liquid aerosol-forming substrate and capable of vaporizing at least a portion of the liquid aerosol-forming substrate to form an aerosol.

[0037] The supplemental heating element may be any device suitable for heating at least a portion of the mouthpiece.

[0038] One or both of the main and auxiliary heating elements may be exemplarily a coil heater, a capillary heater, a mesh heater, a metal plate heater, or one or more conductive tracks on an insulating substrate. The heater may be exemplarily a resistive heater that receives electrical power and converts at least a portion of the received electrical power into thermal energy. Alternatively or additionally, one or both of the main and auxiliary heating elements may be a susceptor that is inductively heated by a time-varying magnetic field. One or both of the main and auxiliary heating elements may include only a single heating element or multiple heating elements. The temperature of the heating element(s) is preferably controlled by an electrical circuit.

[0039] In any of the above embodiments, at least one heating element preferably comprises an electrically resistive material. Suitable electrically resistive materials include, but are not limited to, semiconductors such as doped ceramics, "conductive" ceramics (e.g., molybdenum disilicide, etc.), carbon, graphite, metals, metal alloys, and composites made of ceramic and metallic materials. Such composites may include doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel, nickel-containing, cobalt-containing, chromium-containing, aluminum-containing, titanium-containing, zirconium-containing, hafnium-containing, niobium-containing, molybdenum-containing, tantalum-containing, tungsten-containing, tin-containing, gallium-containing, manganese-containing, and iron-containing alloys, as well as nickel-, iron-, cobalt-, and stainless steel-based superalloys, Timetal®, and iron-manganese-aluminum-based alloys. In the composite material, the electrically resistive material may be optionally embedded in, encapsulated in, or coated with the insulating material, or vice versa, depending on the required energy transfer kinetics and external physicochemical properties. Examples of suitable composite heater elements are disclosed in U.S. Patent (issued) No. 5,498,855, International Patent Publication No. 03 / 095688, and U.S. Patent (issued) No. 5,514,630.

[0040] The vaporization unit may further comprise a capillary material for conveying the liquid aerosol-forming substrate to the heater element. The capillary material may have a fibrous or spongy structure. The capillary material preferably comprises a bundle of capillaries. For example, the capillary material may comprise a plurality of fibers or threads, or other fine tubes. The fibers or threads may be generally aligned to convey the liquid to the heater. Alternatively, the capillary material may comprise a spongy or foam-like material. The structure of the capillary material forms a plurality of small pores or tubes through which the liquid can move by capillary action. The capillary material may comprise any suitable material or combination of materials. An example of a suitable material is a porous material. An example of a suitable material is a sponge or foam material. An example of a suitable material includes a ceramic material. An example of a suitable material includes a graphite-based material. A suitable material may be a fiber. A suitable material may be a sintered powder. A suitable material may be a metal foam. A suitable material may be a plastic material. A suitable material may be a fibrous material. Suitable materials may be made of spun fibers. Suitable materials may be made of extruded fibers. Suitable materials may be made of cellulose acetate. Suitable materials may be made of polyester. Suitable materials may be made of bonded polyolefins. Suitable materials may be made of polyethylene. Suitable materials may be made of ethylene. Suitable materials may be made of polypropylene. Suitable materials may be made of nylon fibers. Suitable materials may be made of ceramics. Suitable materials may be made of one or more combinations of ethylene, polyethylene, ethylene, polypropylene, or nylon. The capillary material may have any suitable capillary action and porosity for use with different liquid physical properties. The liquid has physical properties including, but not limited to, viscosity, surface tension, density, thermal conductivity, boiling point, and vapor pressure that allow the liquid to be moved through the capillary material by capillary action. The capillary material may be configured to convey the aerosol-forming substrate to the vaporizer. The capillary material may extend into a gap in the vaporizer.

[0041] The one or more capillary wicks may be arranged to contact liquid held in the liquid storage portion. The one or more capillary wicks may extend into the liquid storage portion, whereby in use liquid may be transferred from the liquid storage portion to one or more elements of the aerosol generation means by capillary action in the one or more capillary wicks. The one or more capillary wicks may have a first end and a second end. The first end may extend into the liquid storage portion for drawing liquid aerosol-forming substrate held within the liquid storage portion into the aerosol generation means.

[0042] The capillary material may be arranged to contact a liquid held in the liquid storage portion. The capillary material may extend into the liquid storage portion, whereby in use liquid may be transferred from the liquid storage portion to one or more elements of the aerosol generation means by capillary action in the capillary material. The capillary material may have a first end and a second end. The first end may extend into the liquid storage portion to draw a liquid aerosol-forming substrate held within the liquid storage portion into the aerosol generation means.

[0043] The terms "upstream" and "downstream" as used herein are used to describe the relative location of components or portions of components of a mouthpiece or an aerosol generating device used with a mouthpiece, relative to the direction in which air flows through the mouthpiece or aerosol generating device along an airflow path during use of the mouthpiece or aerosol generating device. A mouthpiece according to the invention may comprise a proximal end through which the aerosol exits the mouthpiece during use. The proximal end of the aerosol generating device may also be referred to as the oral end or downstream end. The proximal end of the aerosol generating device may be the mouthpiece connected to the aerosol generating device. The oral end is downstream of the distal end. The distal end or mouthpiece of the aerosol generating device may also be referred to as the upstream end. Components or portions of components of a mouthpiece or aerosol generating device may be described as being upstream or downstream of each other based on their relative location with respect to the airflow path through the mouthpiece or aerosol generating device.

[0044] The term "airflow path" as used herein means a channel suitable for transporting a gaseous medium. The airflow path may be used to transport ambient air. The airflow path may be used to transport an aerosol. The airflow path may be used to transport a mixture of air and an aerosol.

[0045] The cartridge for storing the aerosol-forming substrate may be part of a replaceable mouthpiece. The cartridge may form an integral part of the mouthpiece. The cartridge may be refillable. Once the aerosol-forming substrate is consumed, the user may refill the cartridge so that the mouthpiece containing the refillable cartridge can be reused. Designing parts to be reusable helps to reduce waste and reduces the ecological impact of the device or system or cartridge on the environment.

[0046] The cartridge for storing the aerosol-forming substrate may be part of the main unit of the aerosol generation system. The cartridge may form an integral part of the main unit. The cartridge may be refillable. Once the aerosol-forming substrate is consumed, the user may refill the cartridge so that a mouthpiece containing a refillable cartridge can be reused.

[0047] The cartridge for storing the aerosol-forming substrate may be configured to be replaceable: once the aerosol-forming substrate is consumed, a user may remove the cartridge from the aerosol generation system and replace the used cartridge with a new filled cartridge.

[0048] When the aerosol generation system is assembled, an airflow path may be defined between the mouthpiece and the main unit. The mouthpiece and the main unit may be connected using any suitable connection means. The connection means may include a threaded connection, a friction fit, or a form-fit connection. The connection means may be configured such that the connection can be established manually by a user. This may facilitate handling and assembly of the aerosol generation system.

[0049] The mouthpiece and the main unit may have corresponding structural components with complementary geometric shapes. The structural components with complementary geometric shapes are preferably provided on adjacent interface parts of the mouthpiece and the main unit. When the mouthpiece and the main unit are assembled, these interface parts may be located next to each other. When the mouthpiece is connected to the main unit, these corresponding structural components of the mouthpiece and the main unit may define an airflow path from the air inlet to the air outlet via the main heating element and, optionally, via the auxiliary heating element. The airflow path is formed when the main unit and the mouthpiece are assembled. In those embodiments, the main unit may be rendered inoperable since, without the mouthpiece, no continuous airflow path is provided for inhaling the aerosol. Thereby, the main unit alone does not allow the formation of an aerosol suitable for inhalation. Thereby, an efficient protection mechanism against unauthorized use may be provided.

[0050] Both the cartridge and the mouthpiece may be replaceable. One or both ends of the cartridge or the mouthpiece may be protected by a sealing foil. The sealing foil may be a pierceable sealing foil that is broken during assembly of the aerosol generating system. The sealing foil may be a removable sealing foil that is removed from the cartridge before the cartridge is assembled with the main device or unit.

[0051] Such a sealing foil may protect the cartridge and mouthpiece from debris or other undesirable contaminants during transport, and especially prior to use.

[0052] According to one embodiment of the present invention there is provided a mouthpiece for an aerosol generation system as described herein.

[0053] The invention will now be further described, by way of example only, with reference to the accompanying drawings in which: [Brief description of the drawings]

[0054] [Figure 1] FIG. 1 shows the aerosol generation system in a disassembled configuration. [Diagram 2] FIG. 2 shows the assembled aerosol generation system. [Diagram 3] FIG. 3 shows a portion of the assembled aerosol generation system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0055] The following provides a non-exhaustive list of non-limiting examples, any one or more of the features of which may be combined with any one or more features of the other examples, embodiments, or aspects described herein.

[0056] Example A: An aerosol generating system comprising a main unit and a mouthpiece, The main units are a main heating element for heating the aerosol-forming substrate; The mouthpiece, An aerosol generating system comprising an airflow path and an auxiliary heating element.

[0057] Example B: An aerosol generating system as described in Example A, wherein the mouthpiece is replaceable.

[0058] Example C: An aerosol generation system as described in Example A or Example B, wherein the auxiliary heating element is configured to heat at least a portion of the airflow path of the mouthpiece, preferably the auxiliary heating element is located within the airflow path of the mouthpiece.

[0059] Example D: An aerosol generating system according to any of Examples A to C, wherein the auxiliary heating element is a resistive heating element.

[0060] Example E: An aerosol generating system according to any of Examples A to D, wherein the main heating element and the auxiliary heating element are configured to be separately controllable.

[0061] Example F: A temperature sensor; a controller electrically connected to the temperature sensor and the auxiliary heating element; An aerosol generating system described in any of Examples A to E, wherein the controller is configured to activate the auxiliary heating element depending on the temperature sensed by the temperature sensor.

[0062] Example G: An aerosol generating system as described in Example F, wherein the temperature sensor is an ambient temperature sensor.

[0063] Example H: An aerosol generation system as described in Example F or Example G, wherein the temperature sensor is located within the airflow path of the mouthpiece.

[0064] Example I: An aerosol generating system described in any of Examples A to E, comprising a controller electrically connected to the auxiliary heating element, the controller being in communication with an external data source, and configured to activate the auxiliary heating element depending on temperature information received from the external data source.

[0065] Example J: An aerosol generating system described in any of Examples A to I, wherein the mouthpiece is provided with a guiding member disposed in the airflow path of the mouthpiece, the guiding member being configured to guide condensed liquid components from the airflow in a direction toward the main heating element.

[0066] Example K: An aerosol generating system as described in Example J, wherein the surface of the guide member comprises a hydrophobic material.

[0067] Example L: An aerosol generating system as described in Example J or Example K, wherein the guiding member is cone-shaped and the tip of the cone-shaped guiding member faces in a direction toward the main heating element.

[0068] Example M: ​​An aerosol generation system described in any of Examples J to L, wherein the longitudinal axis of the conical guiding member is arranged parallel to the longitudinal axis of the aerosol generation system and the base of the conical guiding member is directed toward the proximal end of the aerosol generation system.

[0069] Example N: An aerosol generating system as described in Example M, wherein the conical guiding member is hollow and divides the airflow path of the mouthpiece into a downstream airflow chamber disposed within the hollow conical guiding member and an upstream airflow chamber surrounding the hollow conical guiding member.

[0070] Example O: An aerosol generation system as described in Example N, wherein the hollow cone-shaped guiding member has one or more openings arranged to fluidly connect the upstream airflow chamber and the downstream airflow chamber.

[0071] Example P: An aerosol generation system as described in Example N or Example O, wherein the base of the hollow cone-shaped guiding member has an opening configured as an airflow exit port.

[0072] Example Q: An aerosol generating system according to any one of Examples N-P, wherein an auxiliary heating element is disposed within the upstream airflow chamber.

[0073] Example R: An aerosol generating system according to any of Examples A to Q, wherein the main unit comprises a liquid storage portion containing a liquid aerosol-forming substrate, and the main heating element is configured to heat the liquid aerosol-forming substrate.

[0074] Example S: A main unit includes a main body and a replaceable cartridge; The main body includes control electronics and a power supply; the cartridge includes a main heating element and a liquid storage portion; The aerosol generation system of embodiment R, wherein the mouthpiece is attached to a cartridge and the cartridge is attached to the body.

[0075] Example T: A mouthpiece for use in the aerosol generating system according to any one of Examples A to S.

[0076] Example U: The mouthpiece of example T, wherein the mouthpiece is replaceable.

[0077] Features described with respect to one embodiment may be equally applied to other embodiments of the invention.

[0078] FIG. 1 shows a cross-section of a generally cylindrical aerosol generation system, including a replaceable mouthpiece 10 and a main unit 40, in a detached configuration.

[0079] The replaceable mouthpiece 10 comprises an auxiliary heating element 12. The auxiliary heating element 12 may be a resistive heating element (e.g., a coil of wire) or an arrangement of conductive tracks on an insulating substrate. The replaceable mouthpiece 10 comprises an air inlet 14 and an open chamber portion 16. The replaceable mouthpiece 10 comprises a hollow element. In the embodiment shown, the hollow element is a hollow tubular element 18. However, the hollow element may also be of a different shape, for example a hollow truncated cone or a hollow cube, so long as the airflow path is not interrupted (as described below). The hollow tubular element 18 comprises a conical end portion 20, a tube inlet opening 22, and a tube outlet opening 24. The tube outlet opening 24 is in direct fluid communication with an annular homogenization chamber 26. The auxiliary heating element 12 is located within the homogenization chamber 26.

[0080] The mouthpiece 10 further comprises a cone-shaped guiding member 28 having an opening 30. The longitudinal axis of the cone-shaped guiding member 28 is disposed parallel to the longitudinal axis of the aerosol generation system. The base of the cone-shaped guiding member 28 is oriented toward the proximal end of the aerosol generation system. The cone-shaped guiding member 28 is hollow, surrounding an empty interior space 32.

[0081] Thus, the hollow conical guiding member 28 divides the airflow path of the mouthpiece 10 into a downstream airflow chamber disposed within the hollow conical guiding member 28 and an upstream airflow chamber surrounding the hollow conical guiding member 28, with the interior space 32 of the hollow conical member 28 being the downstream airflow chamber and the homogenization chamber 26 being the upstream airflow chamber.

[0082] The homogenization chamber 26 is in fluid communication with an interior space 32 of a hollow cone-shaped member 28 via an opening 30. The base of the cone-shaped member 28 forms an air outlet 34 for inhalation by the user.

[0083] 1, there is no continuous airflow path defined within mouthpiece 10 between air inlet opening 14 and outlet end 34. This is due to the open distal end of mouthpiece 10 (see dotted line at the bottom end of mouthpiece 10 in FIG. 1) not providing an enclosed air channel from air inlet 14 to the inside of hollow tubular element 18.

[0084] The main unit 40 is an aerosol generating device that includes a cartridge and heating section 42 and a power and control section 70. The cartridge and heating section 42 and the power and control section 70 may be removable or may be formed as an integral main unit 40.

[0085] The cartridge and heating section 42 comprises a liquid reservoir 44 filled with a liquid aerosol-forming substrate. The liquid reservoir 44 coaxially surrounds a tubular cavity 46 having an open proximal end 48. The inner diameter of the tubular cavity 46 is greater than the outer diameter of the tubular element 18 of the mouthpiece 10.

[0086] The cartridge heating section 42 includes a main heating element for heating the aerosol-forming substrate. The main heating element includes a ceramic heater body 50 connected to an electrical resistor 52 and electrical contacts 54. The ceramic heater body 50 is a porous ceramic component in fluid communication with the liquid aerosol-forming substrate stored in the liquid storage portion 44. An aerosolization zone 56 is provided within a bowl-shaped cavity surrounded by the ceramic heater body 50. Additionally, overmolded seals 58, 60 are provided for mounting the main heating element in a leak-tight manner.

[0087] The power and control section 70 includes a controller 72 and a battery 74. The controller 72 is electrically connected to both the main heating element contacts 54 and the battery 74. Additional contacts (not shown) are provided to electrically connect the controller 72 to the auxiliary heating element 12 when the mouthpiece 10 is attached to the main unit 40.

[0088] When the main heating element is activated, the liquid aerosol-forming substrate absorbed in the porous ceramic component 50 is vaporized. The vaporized aerosol-forming substrate is mixed with the ambient air to form an aerosol. For this purpose, an airflow path is defined within the assembled aerosol generating system.

[0089] FIG. 2 shows a cross-section of the aerosol generating system of FIG. 1 in an assembled configuration, with the replaceable mouthpiece 10 attached to the main unit 40.

[0090] In the assembled configuration, the mouthpiece 10 cylindrically surrounds and is frictionally engaged with the cartridge and heating section 42 of the main unit 40. In the fully assembled position, an enclosed airflow path is defined between corresponding structural components of the mouthpiece 10 and the cartridge and heating section 42 of the main unit 40 having a complementary geometric shape. The airflow path extends from the air inlet 14 to the aerosolization zone 56 of the main heating element and further from the aerosolization zone 56 to the air outlet 34.

[0091] When a user draws on the outlet end 34 of the mouthpiece 10, an airflow is established from the air inlet opening 14 toward the aerosolization zone 56 where the drawn air mixes with the atomized aerosol-forming substrate. Under aerosol formation, the mixture is conveyed to the air outlet 34 where it is inhaled by the user. The airflow path is shown in more detail in FIG.

[0092] FIG. 3 shows a cross-section of a portion of the aerosol generation system of FIG. 2 in an assembled configuration in which the replaceable mouthpiece 10 is attached to the cartridge and heating section 42 of the main unit 40.

[0093] When a user draws on the air outlet 34 of the mouthpiece 10, an airflow is established. Ambient air 62 enters the air inlet 14 and enters a first portion of an airflow path formed between a wall 64 of the mouthpiece 10 and a wall 66 of the cartridge and heating section 42. The air 62 travels further along a second portion of an airflow path formed between the walls 18, 20 of the mouthpiece 10 and a wall of the liquid storage section 44 towards the aerosolization zone 56. The drawn air is mixed with the atomized aerosol-forming substrate in the aerosolization zone 56 such that an aerosol 68 is formed. The aerosol 68 is conveyed through the tube inlet opening 22 into the hollow tubular element 18 having a conical end portion 20. The aerosol 68 travels further into the annular homogenization chamber 26. The annular homogenization chamber 26 provides turbulent airflow, creating good conditions for homogenization of the aerosol 68.

[0094] The mixture 68 then enters the openings 30, into the interior space 32 of the cone-shaped guiding member 28, and finally exits the mouthpiece 10 via the air outlet 34 and is inhaled by the user. The openings 30 may be asymmetrically or irregularly positioned to further increase turbulence and homogenization within the interior space 32.

[0095] When the aerosol generating system is used in an environment at room temperature, i.e., approximately 20 degrees Celsius, there may be little tendency for undesirable excessive condensation of the aerosol 68 and droplet formation within the homogenization chamber 26 .

[0096] However, in cold environments (eg, outdoors in the winter where temperatures may be around 0 degrees Celsius), undesirable excessive condensation of the aerosol 68 and droplet formation within the homogenization chamber 26 may become an issue.

[0097] To compensate for these lower temperatures, the supplemental heating element 12 may be activated, thereby increasing the temperature within the homogenization chamber 26 to reduce or prevent undesirable excessive condensation and droplet formation of the aerosol 68.

[0098] Additionally, the conical shape of the guiding member 28 may help guide condensed droplets formed within the homogenization chamber 26 back toward the main heating element where the droplets may be heated and vaporized. This effect may be further enhanced when the outer surface of the conical shaped guiding member 28 comprises a hydrophobic material.

[0099] Finally, the auxiliary heating element 12 may also warm the outer wall of the mouthpiece 10 to provide a comfortable sensation for the user who places the mouthpiece in contact with their lips, especially when using the aerosol generating system in a cold environment.

Claims

1. An aerosol generating system comprising a main unit and a mouthpiece, The main unit is a main heating element for heating the aerosol-forming substrate; The mouthpiece, An airflow path and an auxiliary heating element are provided, the main heating element and the auxiliary heating element are configured to be separately controllable, and the aerosol generating system comprises: A temperature sensor; a controller electrically connected to the temperature sensor and the auxiliary heating element; the controller is configured to activate the auxiliary heating element in dependence on a temperature sensed by the temperature sensor; An aerosol generating system, wherein the temperature sensor is an ambient temperature sensor.

2. 10. The aerosol generating system of claim 1, wherein the mouthpiece is replaceable.

3. 3. An aerosol generation system as described in claim 1 or claim 2, wherein the auxiliary heating element is configured to heat at least a portion of the airflow path of the mouthpiece, and preferably the auxiliary heating element is located within the airflow path of the mouthpiece.

4. 2. The aerosol generating system of claim 1, wherein the auxiliary heating element is a resistance heating element.

5. 2. The aerosol generating system of claim 1, wherein the mouthpiece comprises a guide member disposed in the airflow path of the mouthpiece, the guide member configured to guide condensed liquid components from the airflow in a direction toward the main heating element.

6. The aerosol generating system of claim 5 , wherein the surface of the guide member comprises a hydrophobic material.

7. 6. The aerosol generating system of claim 5, wherein the guide member is cone-shaped, and the tip of the cone-shaped guide member faces in a direction toward the main heating element.

8. 6. The aerosol generation system of claim 5, wherein the guide member is conical, the longitudinal axis of the conical guide member is arranged parallel to the longitudinal axis of the aerosol generation system, the base of the conical guide member is directed toward the proximal end of the aerosol generation system, and the conical guide member is hollow, dividing the airflow path of the mouthpiece into a downstream airflow chamber arranged within the hollow conical guide member and an upstream airflow chamber surrounding the hollow conical guide member.

9. 9. The aerosol generating system of claim 8, wherein the hollow cone-shaped guiding member comprises one or more openings arranged to fluidly connect the upstream airflow chamber and the downstream airflow chamber.

10. 9. The aerosol generating system of claim 8, wherein the base of the hollow cone-shaped guiding member comprises an opening configured as an airflow exit port.

11. 9. The aerosol generating system of claim 8, wherein the auxiliary heating element is disposed within the upstream airflow chamber.

12. 2. The aerosol generating system of claim 1, wherein the main unit comprises a liquid storage portion containing a liquid aerosol-forming substrate, and the main heating element is configured to heat the liquid aerosol-forming substrate.

13. A mouthpiece for the aerosol generating system of claim 1.

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