Aerosol generating device for use with an aerosol generating article

Abstract

The present invention relates to an aerosol generating device for use with an aerosol-generating article. The device includes a chamber within a device housing for removably receiving at least a portion of an aerosol-generating article. The chamber has an inner chamber surface and a proximal open end for insertion of the article into the chamber. The device further comprises an insertion sleeve separate from the device housing, the insertion sleeve fixedly disposed within the device such that at least a portion of the insertion sleeve extends along at least a proximal portion of the inner chamber surface. The insertion sleeve comprises an outer sleeve surface and an inner sleeve surface. At a contact portion of the insertion sleeve, the inner sleeve surface is configured to be in intimate circumferential contact with the periphery of the aerosol-generating article when received within the chamber. At least a proximal portion of an airflow path through the device extends along the outer sleeve surface.

Description

[Technical field]

[0001] The present invention relates to an aerosol generating device configured for use with an aerosol-generating article to generate an inhalable aerosol by heating an aerosol-forming substrate contained within the article. The present invention further relates to an aerosol generating system including such a device and such an article. [Background technology]

[0002] Aerosol generating devices for use with aerosol-generating articles containing a heatable aerosol-forming substrate are generally known from the prior art. Such devices may comprise a receiving chamber having an insertion opening for receiving at least a portion of the article. Furthermore, such devices may comprise a heater, e.g. a resistive or inductive heater, for heating the substrate when the article is received in the chamber. The device may be configured such that, in use, volatile compounds released from the heated substrate are mixed into a user-generated airflow through the device to form an aerosol that can be drawn, for example, through a mouthpiece. The receiving chamber may be configured such that a portion of the airflow path through the device extends from the insertion opening along the inner surface of the chamber towards the other end of the chamber opposite the insertion opening, where the airflow enters the article at the article distal end and passes further towards the article proximal end. In particular, the airflow path may extend along a passageway formed between the inner surface of the chamber and the outer surface of the article when received in the chamber.

[0003] While such airflow paths have some advantages, such as preconditioning of the incoming air before mixing with the volatilized substrate, the airflow can experience a pressure drop as it passes along the outer surface of the article, which in turn can affect the resistance to draw (RTD) of the system.

[0004] It would therefore be desirable to have an aerosol generating device and corresponding system that possesses the advantages of the prior art solutions while mitigating their limitations, and in particular, it would be desirable to have an aerosol generating device and corresponding system that provides improved airflow management and improved controllability of resistance to draw (RTD). Summary of the Invention

[0005] According to the present invention, there is provided an aerosol generating device for use with an aerosol-generating article. The device includes a chamber within the device housing for removably receiving at least a portion of the aerosol-generating article. The chamber has an inner chamber surface and a proximal open end for insertion of the article into the chamber. The device further comprises an insertion sleeve separate from the device housing, the insertion sleeve fixedly disposed within the device such that at least a portion of the insertion sleeve extends along at least a proximal portion of the inner chamber surface. The insertion sleeve comprises an outer sleeve surface and an inner sleeve surface. At a contact portion of the insertion sleeve, the inner sleeve surface is configured to be in intimate circumferential contact with the periphery of the aerosol-generating article when the article is received within the chamber. At least a proximal portion of an airflow path through the device extends along the outer sleeve surface.

[0006] According to the invention, it has been found that in an aerosol generating device of the above-mentioned type, the pressure drop observed in the airflow path between the inner surface of the chamber and the outer surface of the aerosol-generating article is at least partially due to certain properties of the article received in the chamber. In particular, it has been found that the porosity of the elements forming the article can cause the observed pressure drop, since the air flowing along the outer surface of the article during a user's puff can be partially absorbed by the outer surface of the article. Depending on the particular structure of the article, this effect can occur in particular in the part of the received article that is surrounded by a proximal part of the inner chamber surface close to the proximal open end of the chamber that is used to insert the article into the chamber.

[0007] To reduce such pressure drops, the present invention suggests avoiding airflow through the device passing along the outer surface of the received article, at least in the proximal part of the chamber. To achieve this, the present invention proposes an insertion sleeve arranged and configured to block or at least restrict airflow along the outer surface of the article in the proximal part of the chamber, while at the same time providing an alternative airflow path through the device in that part of the chamber. To this end, the insertion sleeve is arranged such that at least a portion of the insertion sleeve extends along at least a proximal part of the chamber inner surface. Thus, when the article is inserted into the chamber, the article passes through the insertion sleeve in the proximal part of the chamber.

[0008] Airflow along the outer surface of the article is blocked or at least restricted because the inner surface of the sleeve in the contact portion is configured to fit circumferentially around that portion of the article disposed within the insertion sleeve when the article is received within the chamber.

[0009] As used herein, the term "circumferentially intimate" refers to a sealing contact between the outer surface of the article and the inner surface of the sleeve in the contact portion along the circumference of the article, which prevents or at least restricts airflow between the outer surface of the article and the inner surface of the sleeve in the contact portion. For this reason, the shape of the inner surface of the sleeve in the contact portion preferably matches the shape of the respective part of the article with which it will contact when inserting the article into the chamber. In particular, the inner cross-sectional shape of the inner surface of the sleeve in the contact portion may correspond to the outer cross-sectional shape of the article that is intended to contact the inner surface of the sleeve in the contact portion. The shape of the inner surface of the sleeve in the contact portion may depend on the aerosol-generating article that is intended to be received in the sleeve, but any suitable shape is conceivable. For example, the inner surface of the sleeve in the contact portion (at least a section thereof) may have a cylindrical shape. Additionally or alternatively, the inner surface of the sleeve in the contact portion (at least a section thereof, in particular a section other than the cylindrical section thereof) may have a conical shape. The inner surface of the sleeve in the contact portion (at least a section thereof) is preferably a (substantially) smooth surface portion. As used herein, a "smooth surface" means free or substantially free of protrusions and / or irregularities. The inner surface within the contact portion may be a continuous surface. The term "surface contact" may include two parallel surfaces arranged in contact with each other having the same bending radius. Similarly, the inner surface within the contact portion (at least a section thereof) may have a ring shape. For example, a ring-shaped protuberance may be provided on the inner surface of the contact portion that is in circumferential contact with the circumference of the aerosol-generating article when the article is received in the chamber. The ring-shaped protuberance may thus exert an annular retention force on the article when it is received in the chamber. The ring-shaped protuberance may have a contact width (axial direction of the insertion sleeve) in the range of 0.5 millimeters to 2 millimeters. The size of the inner cross-sectional shape of the ring-shaped protuberance may vary along the axial direction of the insertion sleeve. In particular, the inner cross-sectional shape of the ring-shaped protuberance may decrease, in particular decrease smoothly, in the distal direction along the axial direction of the insertion sleeve.Preferably, the inner cross-sectional shape of the ring-shaped ridge may decrease (smoothly) in the distal direction starting from a maximum inner cross-sectional shape of the contact portion to a minimum inner cross-sectional shape and then increase again abruptly, in particular to form a sharp distal edge of the ring-shaped ridge.

[0010] In accordance with the present invention, the above-mentioned alternative airflow path extending along at least the proximal portion of the chamber is realized along the outer surface of the sleeve, thereby allowing at least a portion of the outer surface of an article disposed within the proximal portion of the chamber to be bypassed from exposure to airflow through the device.

[0011] The chamber may have a substantially cylindrical shape. As used herein, the term "substantially cylindrical shape" refers to the shape of the chamber without considering protrusions, i.e., the shape of an envelope passing through the radially outermost portion of the inner surface of the chamber.

[0012] The chamber has a proximal open end that serves as an insertion opening through which the aerosol-generating article can be inserted into the chamber. As used herein, the direction in which the aerosol-generating article is inserted is indicated as the insertion direction. The insertion direction preferably corresponds to an extension of the central axis of the chamber. Upon insertion into the chamber, at least a portion of the aerosol-generating article may still extend outwardly through the proximal open end. The outwardly extending portion may preferably be provided for interaction with the user, in particular for being placed into the user's mouth. Thus, during use of the device, the proximal open end may be closer to the user's mouth. Thus, the section closer to the proximal open end (insertion opening) or closer to the user's mouth during use of the device, respectively, is indicated with the prefix "proximal". The section that is disposed further away is indicated with the prefix "distal". Accordingly, as used herein, "proximal" may imply a direction towards the user of the device, while "distal" may imply a direction opposite to the proximal direction, i.e., away from the user of the device. The insertion direction may preferably be in a distal direction. The chamber may be disposed or located in a proximal portion of the aerosol generating device. Similarly, the insertion opening may be disposed or located in a proximal end of the aerosol generating device.

[0013] As used herein, a "sleeve" may refer to a generally tubular shaped element. In particular, a sleeve may include opposed open ends. As used herein, "fixedly disposed within the device" means non-movable, such as spatially fixed or non-movably attached to a location within the device.

[0014] The insertion sleeve may have a wall thickness in a radial direction (relative to a central axis of the insertion sleeve) of less than 1.0 mm, preferably less than 0.5 mm, more preferably less than 0.2 mm, such that flow in the airflow path may flow through the sleeve in a substantially axial direction of the chamber without being deflected by the insertion sleeve.

[0015] The length extension of the sleeve along the central axis of the sleeve may be in the range of 10 to 120 percent, preferably 20 to 40 percent, more preferably 25 to 30 percent of the length extension of the chamber. The length extension of the contact portion may be in the range of 10 to 120 percent, preferably 20 to 40 percent, more preferably 25 to 30 percent of the length extension of the chamber. The length extension of the contact portion may be in the range of 50 to 100 percent, preferably 70 to 90 percent, more preferably 75 to 85 percent of the length extension of the sleeve. In absolute numbers, the length extension of the insertion sleeve along the central axis of the sleeve may be in the range of 3.5 mm to 8 mm, in particular 4 mm to 7 mm, preferably 4.5 mm to 6.5 mm, for example 4.7 mm or 4.75 mm or 6.25 mm.

[0016] The inner surface in the contact portion may advantageously be configured for retention of the article in the chamber. For example, the inner surface in the contact portion may be configured to exert a frictional force on the article that prevents the article from falling proximally out of the chamber in any spatial orientation of the device. The frictional force may depend on the surface roughness of the article outer surface and the force exerted by the inner surface in the contact portion on the article outer surface. In particular, it is possible that the aerosol-generating article may exclusively contact the insertion sleeve in the proximal portion of the chamber.

[0017] In particular, the proximal portion of the airflow path may be at least partially formed between the sleeve outer surface and the chamber inner surface, such that the proximal portion of the airflow path is still provided within the chamber. The chamber inner surface may be the innermost surface facing towards the interior of the chamber.

[0018] Because the insertion sleeve is provided as part of the device, the hydrodynamic properties of the sleeve's outer surface may be predefined and configured to facilitate desired characteristics of airflow in the proximal portion of the airflow pathway.

[0019] The insertion sleeve may include a plurality of airflow channels disposed around the circumference of the sleeve outer surface, the airflow channels forming part of the proximal portion of the airflow path. Such airflow channels may be used to at least partially reduce turbulence in the proximal portion of the airpath, and thus further reduce undesirable pressure drops within the device. Alternatively, or additionally, laminar airflow in the proximal portion of the airpath may be promoted.

[0020] Advantageously, one or more of the airflow channel width extension, the airflow channel depth extension, or the number of airflow channels may be selected such that upon insertion of the aerosol-generating article into the chamber, the resistance to withdrawal (RTD) is within a desired range. In a non-limiting example, the number of airflow channels may be in the range of 3 to 15, such as 5 or 12.

[0021] The device withdrawal resistance (RTD) may be in the range of 70 mmWG to 120 mmWG. The withdrawal resistance (RTD) may be preferably 40 mmWG to 70 mmWG, particularly 45 mmWG to 65 mmWG, for example 55 mmWG.

[0022] The airflow channels may extend substantially along a length extension of the insertion sleeve, and the length extension of the sleeve may extend along a central axis of the insertion sleeve, such that airflow along the insertion sleeve is directed to flow in a direction substantially along the length extension of the insertion sleeve and thus is prevented from flowing in a direction along the circumference of the insertion sleeve.

[0023] The airflow channels may be formed between adjacent ridges spaced apart from one another along the circumference of the insertion sleeve (on the outside of the insertion sleeve). The ridges may have a longitudinal extension along the length of the insertion sleeve. The ridges may be integrally formed with the insertion sleeve. Advantageously, the shape and distance of the multiple ridges may be selected such that upon insertion of the aerosol-generating article into the chamber, the resistance to withdrawal (RTD) is within the desired range noted above.

[0024] The cross-sectional area of ​​the airflow path through the device may increase downstream of the ridge due to the absence of the ridge. Thus, the airflow velocity of the airflow in the airflow path may decrease downstream of the ridge. Thus, the longitudinal extension of the ridge may be adapted to obtain a change in airflow velocity, such as a decrease in airflow velocity, at a desired location in the chamber. For example, a decrease in the airflow velocity along at least a portion of the distal portion of the airflow path may facilitate increased pre-heating of the airflow due to the increased time the airflow spends in the distal portion for recovery.

[0025] The transverse cross-section of each ridge may have any suitable shape. The cross-section of each ridge preferably includes a substantially rectangular or trapezoidal shape, optionally having at least one convex surface. However, other shapes are contemplated, such as convex or substantially semicircular. The ridge may protrude radially outward from a central axis of the insertion sleeve. Thereby, the airflow may be guided along the outer surface of the insertion sleeve.

[0026] Additionally, the ridges may function to secure the insertion sleeve within the device housing and to position the insertion sleeve coaxially relative to the chamber, in particular relative to the chamber. To this end, the ridges may contact the chamber inner surface. The contact may be such that the insertion sleeve is secured within the chamber by a friction fit. Each of the ridges may comprise an outer contact surface configured to correspond to a radius of curvature of the chamber inner surface for contacting the chamber inner surface. Furthermore, by providing the ridges in contact with the chamber inner surface, adjacent airflow channels may not be in fluid communication with each other.

[0027] The ridge may extend beyond the distal edge of the insertion sleeve, particularly such that the insertion sleeve comprises a discontinuous distal rim at the distal end of the insertion sleeve. The inner sleeve surface may terminate at the distal edge of the insertion sleeve. The outer sleeve surface may terminate at the distal end of the insertion sleeve. Alternatively, the inner surface (facing towards the central axis of the insertion sleeve) of that portion of the ridge that extends beyond the distal edge of the insertion sleeve may be part of the inner insertion sleeve surface.

[0028] The ridges may extend beyond the proximal edge of the insertion sleeve, in particular such that the insertion sleeve comprises a discontinuous proximal rim at the proximal end of the insertion sleeve. The sleeve inner surface may terminate at the proximal edge of the insertion sleeve. Similarly, the sleeve outer surface may terminate at the proximal edge of the insertion sleeve. Alternatively, the inner surface of that portion of the ridge that extends beyond the distal edge of the insertion sleeve (facing towards the central axis of the insertion sleeve) may be part of the insertion sleeve inner surface. The gaps between the proximal end portions of the proximally extending ridges at the proximal end of the insertion sleeve may form axial recesses in fluid communication with the respective airflow channels. The recesses may advantageously form air intakes that allow air to enter the proximal portion of the airflow path, in particular the airflow channels.

[0029] Similarly, the airflow channels may be formed by grooves on / in the sleeve outer surface (i.e. on the outside of the insertion sleeve). The grooves may guide the airflow along the insertion sleeve outer surface. The grooves may have a width extension along the circumference of the sleeve and a depth extension along the radial direction of the sleeve. The transverse cross-section of each groove may have any suitable shape. The cross-section of each groove preferably comprises a substantially rectangular or trapezoidal shape, optionally with at least one curved side. However, other shapes are contemplated, such as an inwardly concave shape or a substantially semicircular shape.

[0030] The chamber may be formed as a sleeve received in a cavity in the proximal portion of the device housing, preferably having a distal closed end. Similarly, the chamber may be formed as a barrel received in a cavity in the proximal portion of the device housing. The sleeve or barrel may be at least partially inserted into the cavity. The proximal portion of the aerosol generating device may form part of the device housing. The cavity may thus be formed in the housing of the aerosol generating device. Forming the chamber as a sleeve or barrel may be beneficial with regard to easy manufacture and assembly of the device. Alternatively or additionally, it is facilitated that the chamber may be made of a different material than the proximal portion of the aerosol generating device, in particular the proximal portion of the device housing. For example, the chamber may include or be at least partially made of an insulating material. The insulating material may be configured to provide insulation to maintain heat within the interior of the chamber and the proximal portion of the aerosol generating device, in particular the device housing, and to prevent heat transfer between the interior of the chamber and the proximal portion of the aerosol generating device.

[0031] The insertion sleeve may cooperate with a proximal portion or end of the chamber, particularly to lock the sleeve from moving at least in a distal direction. The insertion sleeve may comprise an unattached end, a sleeve distal end.

[0032] The chamber may include one or more stops at a distal end of the chamber configured to prevent the article from moving in at least the distal direction.

[0033] The insertion sleeve may comprise an intake portion at a proximal end of the insertion sleeve, which may advantageously comprise an enlarged cross section compared to other more distal parts of the insertion sleeve, such as the proximal part of the chamber, in particular that part of the insertion sleeve extending along the contact portion.

[0034] In particular, the inner cross-sectional area of ​​the insertion sleeve may increase in a proximal direction along at least a portion of the intake section. The inner sleeve surface may preferably include one of a frusto-conical or funnel shape within the intake section. In a non-limiting example, the inner cross-section of the inner sleeve surface may expand to correspond at least to the inner cross-section of the inner chamber surface. Thus, the inner sleeve surface may advantageously guide the aerosol-generating article during insertion of the article into the device, particularly toward a position radially of the device and coaxial with the chamber.

[0035] The intake portion preferably protrudes proximally beyond the proximal end of the chamber, such that the airflow entering the device can be received and redirected within the intake portion before entering the chamber. In particular, the incoming airflow may enter the intake portion or the airflow channel, or the intake portion and the airflow channel, at a desired angle of incidence relative to the central axis of the insertion sleeve. Thus, the intake portion may be configured to receive the airflow entering the device. That is, the intake portion may be configured to redirect the airflow as it enters the device.

[0036] The intake portion may include one or more air inlets for air to enter a proximal portion of the airflow path along the outer surface of the sleeve, particularly into an airflow channel on the outer surface of the sleeve. The air inlets may be shaped and arranged in a variety of configurations to achieve different airflow management configurations, particularly different methods of supplying air to the proximal portion of the airflow airpath.

[0037] Depending on the number of airflow channels and air inlets and their sizes, the total cross-sectional area of ​​the air inlets (all air inlets) may be in the range of 5-8 square millimeters, or 6-9 square millimeters, or 5-7 square millimeters, or 3-5 square millimeters.

[0038] In general, the air inlet may be disposed at least partially outside the chamber. Similarly, the air inlet may be disposed at least partially inside the chamber. In particular, the air inlet may extend distally from the intake portion and partially into the chamber. Further details of the air inlet are discussed further below.

[0039] The airflow channel may terminate in a proximal direction distal to the proximal edge of the insertion sleeve. The airflow channel may thus be accessible from the outside of the insertion sleeve in a radially inward direction relative to the length extension of the insertion sleeve. In particular, the airflow channel may be accessible from the outside of the insertion sleeve only in a radially inward direction relative to the length extension of the insertion sleeve. More particularly, the airflow channel may terminate in a proximal direction distal to the proximal edge of the insertion sleeve, thus providing an air intake that is accessible from the outside of the insertion sleeve only in a radially inward direction, in particular in a radially inward direction, relative to the length extension of the insertion sleeve.

[0040] Terminating the airflow channel in a proximal direction distal to the proximal edge of the insertion sleeve may function to prevent the airflow channel from being blocked by items or debris axially of the device. This configuration is beneficial in handheld devices where the airflow channel is susceptible to undesired clogging by debris or dirt when stored or carried, for example, in a pocket, bag, etc. Such clogging may also occur unintentionally when a user incorrectly inserts an aerosol-generating article into the device and the article comes into contact with the axially open airflow channel. This configuration of the airflow channel may also include that the incoming airflow may first enter the device in a distal direction parallel to the length extension of the insertion sleeve, and then enter the airflow channel in a radially inward direction relative to the length extension of the insertion sleeve.

[0041] Alternatively, the airflow channel may extend proximally to the proximal edge of the insertion sleeve. Thus, the airflow channel may be accessible (at least) from the outside of the insertion sleeve in a distal direction, in particular only in the distal direction, or at least one of a distal direction and a radially inward direction relative to the length extension of the insertion sleeve. More specifically, the airflow channel may extend proximally to the proximal edge of the insertion sleeve, thus providing an air intake that is (at least) accessible in a distal direction, in particular only in the distal direction, or at least one of a distal direction and a radially inward direction relative to the length extension of the insertion sleeve. In either of the latter configurations, the incoming airflow may enter the airflow channel at least in a distal direction, i.e., in the direction of the length extension of the airflow channel, which may help to reduce the resistance to draw (RTD).

[0042] The airflow channel may taper toward the proximal edge of the insertion sleeve in at least one of the airflow channel width extension and the airflow channel depth extension. A transverse cross section of the airflow channel at such tapered segment of the airflow channel may comprise a curved shape in at least one of the airflow channel width extension and the airflow channel depth extension to provide an aerodynamic shape of the airflow channel, whereby the resistance to withdrawal (RTD) of the device may be optimized.

[0043] The insertion sleeve may comprise one or more through holes, in particular in the intake section, i.e. through the wall of the insertion sleeve, in particular in the intake section. The one or more through holes provide fluid communication from inside the insertion sleeve, in particular from inside the intake section, to a proximal part of the airflow path on the sleeve outer surface. In particular, the insertion sleeve may comprise for each airflow channel a through hole in the intake section that is in fluid communication with the respective airflow channel. The through hole may thus allow air to enter the proximal part of the airflow path, in particular the airflow channel, from inside the insertion sleeve, in particular from inside the intake section. In other words, the through hole may form an air intake as described above for air to enter the proximal part of the airflow path, in particular the airflow channel, from inside the insertion sleeve, in particular from inside the intake section. That is, the one or more air intakes described above may be formed by one or more through holes through the insertion sleeve in the intake section, which allow air to enter the proximal part of the airflow path, in particular the airflow channel, from inside the intake section. Such an air intake may be denoted as an internal air intake. The through-holes may advantageously be sized and configured to optimize airflow within the intake portion, for example to obtain a desired draw resistance.

[0044] Alternatively, the insertion sleeve may comprise one or more axial recesses at the proximal end of the insertion sleeve, in particular at the proximal edge of the insertion sleeve. In particular, the insertion sleeve may comprise for each airflow channel an axial recess in fluid communication with the respective airflow channel. Similar to the through-holes, the axial recesses may advantageously allow air to enter the proximal part of the airflow path, in particular the airflow channel, from inside the intake section. In particular, the axial recesses may form the air intakes as described above, for air to enter the proximal part of the airflow path, in particular the airflow channel, from inside the intake section. That is to say, the above-mentioned one or more air intakes may be formed by one or more axial recesses at the proximal end of the insertion sleeve, in particular at the proximal edge of the insertion sleeve, which recesses advantageously allow air to enter the airflow path, in particular the proximal part of the airflow channel, from inside the insertion sleeve, in particular from inside the intake section. As already described above, the axial recesses may be formed by respective gaps between the proximal ends of the proximal extending ridges at the proximal end of the insertion sleeve.

[0045] The insertion sleeve may also comprise one or more air inlets, in particular one air inlet for each airflow channel, allowing air to enter the proximal part of the airflow path, in particular the airflow channel, from outside the insertion sleeve. Such air inlets may be denoted as external air inlets. In particular, one or more (external) air inlets may be formed on the outside of the insertion sleeve, for example between a ring-shaped support structure (see below), a ridge and the bottom of the airflow channel. Advantageously, such external air inlets ensure that there is no contact between the airflow and the aerosol-generating article in the proximal part of the chamber.

[0046] Furthermore, the insertion sleeve may comprise a circumferential collar at the proximal end of the insertion sleeve. The collar may have a ring shape or a tubular shape, such as a cylindrical shape. Providing a collar may be beneficial for fixing the insertion sleeve in the device. In particular, the collar may, for example, cooperate with the chamber and seal against it.

[0047] The circumferential collar, if present, may close the airflow channel proximally, i.e., the airflow channel may terminate at the collar. Thus, the airflow channel may advantageously be accessible from outside the insertion sleeve in a radially inward direction relative to the length extension of the insertion sleeve. This may help prevent the airflow channel from being blocked by items or debris axially of the device, as described herein.

[0048] The ridges forming the airflow channels may extend proximally to meet radially flush with the circumference of the collar. Thus, the airflow channels may advantageously be accessible from outside the insertion sleeve in a radially inward direction relative to the length extension of the insertion sleeve. Again, this may help prevent the airflow channels from being blocked by items or debris axially of the device, as described herein.

[0049] In particular, the collar may be a turnover collar that includes a turnover collar portion surrounding the intake portion that is spaced from the outer surface of the sleeve within the intake portion. The turnover collar portion surrounding the intake portion may be beneficial for securing the insertion sleeve within the device and sealing the airflow path to the device housing or chamber.

[0050] The ridges may extend into the space between the turnover collar portion and the intake portion, which advantageously allows the airflow channels to be maintained independent of one another along the turnover collar and each of the airflow channels to be separately in fluid communication with an individual air inlet in the intake portion.

[0051] To arrange the insertion sleeve in a fixed manner in the device, the insertion sleeve may comprise a support structure that provides a form-fit with a corresponding support structure of a correspondingly formed chamber. Similarly, the support structure may be configured to provide a press-fit with a corresponding support structure of the chamber. Thereby, the insertion sleeve may be form-fitted or press-fitted into the chamber. The support structure may be provided on the ridge that forms the airflow channel such that the support structure projects radially outwardly from the insertion sleeve beyond the ridge. As an example, the support structure may be formed by a ring member that extends around the circumference of the insertion sleeve that projects beyond the ridge in a radially outward direction. Similarly, the support structure may be formed by a ring member that extends around the circumference of the turnover collar portion that projects radially outwardly beyond the turnover collar portion. As another example, the support structure may be formed by a plurality of protrusions, in particular stepped protrusions (stepped in the axial direction of the insertion sleeve) on the outer side of the ridge, preferably a respective (stepped) protrusion on the outer side of each of the ridges. The (stepped) protrusions may project radially outwardly beyond the ridge. In particular, the (stepped) protrusions may be arranged in a quasi-ring-like manner around the circumference of the insertion sleeve.

[0052] In addition to the proximal portion, the airflow path through the device may further comprise a distal portion. The distal portion of the airflow path through the device may be formed between a distal portion of the chamber inner surface and an outer surface of the distal portion of the article located outside the insertion sleeve when the article is received in the chamber. The distal portion of the airflow path is in fluid communication with the proximal portion of the airflow path. This arrangement provides the advantage that, on the one hand, a portion of the received aerosol-generating article may be bypassed by the proximal airflow path and thus prevented from affecting the airflow in the proximal portion of the airflow path, and, on the other hand, heat dissipating from the article during operation of the device may be captured by the air flowing through the distal portion of the airflow path. The latter may facilitate an improved thermal efficiency of the device. Furthermore, this configuration may help to prevent condensation in the distal portion of the airflow path.

[0053] In the aforementioned configuration, the insertion sleeve preferably extends only along the proximal portion of the chamber (apart from the portion that may protrude proximally beyond the proximal open end of the chamber). In other portions of the chamber distal to the proximal portion, the chamber interior surface may directly face the outer surface of the aerosol-generating article received in the chamber. These other portions may comprise non-contact portions distal to the proximal portion, the chamber interior surface may be spaced from the outer surface of the aerosol-generating article when received in the chamber. Advantageously, this prevents the outer surface of the article from being affected by condensation that may form on that portion of the chamber interior surface. Furthermore, these other portions may comprise a distal retaining portion distal to the non-contact portion, which is configured to retain the received article in the chamber. The distal retaining portion may also be configured to position the received article radially of the chamber. For both purposes, the chamber interior surface in the distal retaining portion may comprise a plurality of protrusions configured to contact at least a portion of the aerosol-generating article received in the chamber. For example, the plurality of protrusions may comprise retaining ribs. Preferably, the ribs extend substantially along the direction of the central axis of the chamber. The ribs may have a substantially triangular cross-sectional shape. Alternatively, the ribs may have a substantially rectangular or substantially trapezoidal, or substantially semi-elliptical or substantially semi-circular cross-sectional shape. The protrusions, in particular the ribs, may be chamfered or comprise at least one chamfer. Preferably, each protrusion may be chamfered on the side facing the proximal open end of the chamber or may include at least one chamfer facing the proximal open end of the chamber. Advantageously, this facilitates the insertion of the article into the chamber.

[0054] In another configuration, the insertion sleeve may extend further distally beyond the proximal portion of the chamber. In this configuration, the insertion sleeve may include a non-contacting portion disposed distal to the contacting portion. An inner cross-sectional area of ​​the insertion sleeve in the non-contacting portion may be greater than an inner cross-sectional area of ​​the insertion sleeve in the contacting portion. Thus, the sleeve inner surface may be spaced from the article received at a location distal to the contacting portion. Again, this configuration is beneficial in reducing or avoiding the effect of undesired condensation on the outer surface of the article received in the chamber.

[0055] The insertion sleeve may further comprise a distal sleeve portion disposed distal to the non-contact portion. The inner sleeve surface within the distal sleeve portion may be configured to contact the periphery of the aerosol-generating article, particularly the periphery of the distal end portion of the aerosol-generating article, when received within the chamber. The inner sleeve surface within the distal sleeve portion may therefore be configured to retain the received article within the chamber. The inner sleeve surface within the distal sleeve portion may also be configured to position the received article in the radial direction of the chamber. For both purposes, the inner sleeve surface within the distal sleeve portion may comprise a plurality of protrusions configured to contact at least a portion of the aerosol-generating article received within the chamber. For example, the plurality of protrusions may comprise retaining ribs. The ribs preferably extend substantially along the direction of the central axis of the chamber. The ribs may have a substantially triangular cross-sectional shape. Alternatively, the ribs may have a substantially rectangular or substantially trapezoidal, or substantially semi-elliptical or substantially semi-circular cross-sectional shape. The protrusions, particularly the ribs, may be chamfered or comprise at least one chamfer. Each protrusion may preferably be chamfered on the side facing the proximal open end of the chamber, or may include at least one chamfer facing the proximal open end of the chamber, advantageously facilitating insertion of an article into the chamber.

[0056] The insertion sleeve may include a first sleeve segment including a contact portion, a second sleeve segment including a non-contact portion, and a third sleeve segment including a distal sleeve portion. The first sleeve segment, the second sleeve segment, and the third sleeve segment are preferably separate parts from each other. Providing the sleeve as a segment may be beneficial for manufacturing purposes. Furthermore, the sleeve may be conveniently adapted during manufacturing, for example, to be suitable for use with different aerosol-generating articles.

[0057] The aerosol generating device may comprise a fixing ring at the proximal end of the device configured to fix the insertion sleeve, and preferably the chamber, if separate from the device housing, may also comprise a fixing ring, especially to the device housing. The fixing ring is preferably a threaded ring. The threaded ring may be configured to screw the insertion sleeve, and if applicable the chamber, to the device housing. The threaded ring may be configured to engage with a correspondingly formed threaded portion in the device housing. Alternatively, the fixing ring may be configured to fix the insertion sleeve, and if applicable the chamber, by snap-in fixing.

[0058] To prevent airflow from passing along the outer surface of the chamber, the aerosol generating device may include a sealing member, such as a gasket or O-ring. The sealing member may be provided at least partially between the insertion sleeve and the chamber. The sealing member may provide a seal between the insertion sleeve, the chamber, and the fixing ring. In particular, the sealing member may abut against a support structure of the insertion sleeve.

[0059] The device may further comprise a proximal cap, in particular a ring-shaped proximal cap for covering the proximal end face at the proximal end of the device (excluding the open proximal end of the chamber). The proximal cap may comprise an insertion opening for inserting the aerosol-generating article through the open proximal end of the chamber. The proximal cap is preferably configured to be coupled to the primary cap fixing ring. The cross-sectional shape of the insertion opening of the proximal cap may be non-circular. In particular, the proximal cap may comprise a protrusion that protrudes into the insertion opening in a radially inward direction of the sleeve. For example, the protrusion may be configured to not cover the air inlet axially along the central axis of the insertion sleeve. Alternatively, the protrusion may be configured to at least partially cover the air inlet axially along the central axis of the insertion sleeve. Thus, the airflow channel may be closed in the axial direction of the insertion sleeve such that the incoming airflow flows radially into the airflow channel. Advantageously, the protrusion may be configured to prevent debris from clogging the airflow channel.

[0060] The return airflow path may be formed inside the aerosol-generating article when the article is received in the chamber. The return airflow path may be in fluid communication with the airflow paths described herein, in particular with the distal and proximal portions of the airflow paths described herein. When a user inhales the aerosol-generating article, a pressure drop in the airflow path is promoted, thus causing a user-generated airflow in the airflow through the device. In particular, air may enter the proximal portion of the airflow path at the proximal open end of the chamber and further pass distally along the distal portion of the airflow path towards the distal end of the chamber. There, the airflow may be redirected and enter the return airflow path in a proximal direction through the aerosol-generating article. Finally, the airflow may exit the return airflow path through a mouthpiece connected to the aerosol-generating article or the return airflow path.

[0061] The term "aerosol generating device" as used herein generally refers to an electrically operated device capable of interacting with an aerosol-forming substrate provided in an aerosol-generating article to generate an aerosol by heating the substrate. The aerosol generating device is preferably a smoke suction device for generating an aerosol that can be directly inhaled by a user through the user's mouth. In particular, the aerosol generating device is a handheld aerosol generating device.

[0062] The aerosol-generating device may further comprise a heating device for heating the aerosol-forming substrate within the aerosol-generating article received within the chamber of the device. The heating device may be an induction heating device. The induction heating device may comprise an induction source including an inductor configured to generate an alternating magnetic field, in particular a high-frequency magnetic field, within the chamber. The alternating magnetic field, in particular a high-frequency magnetic field, may range from 500 kHz (kilohertz) to 30 MHz (megahertz), in particular from 5 MHz (megahertz) to 15 MHz (megahertz), preferably from 5 MHz (megahertz) to 10 MHz (megahertz). When the article is inserted into the chamber, the alternating magnetic field is used to inductively heat a susceptor that is in thermal contact or in thermal proximity with the aerosol-forming substrate to be heated. The inductor may be arranged to surround at least a portion of the chamber or at least a portion of the inner surface of the chamber, respectively. The inductor may be an inductor coil, for example a helical coil, arranged within a side wall of the chamber or on an outer surface of the chamber. Preferably, the inductor may be arranged to surround at least a non-contact portion of the chamber or the insertion sleeve. More preferably, the inductor may be disposed to surround only the smallest non-contacting portion of the chamber or the non-contacting portion of the insertion sleeve.

[0063] Alternatively, the heating device may be a resistive heating device including a resistive heating element configured to heat when an electric current is passed through it due to the inherent ohmic resistance or resistive load of the resistive heating element. For example, the resistive heating element may comprise at least one of a resistive heating wire, a resistive heating track, a resistive heating grid, or a resistive heating mesh. During use of the device, the resistive heating element is in thermal contact or thermal proximity with the aerosol-forming substrate to be heated.

[0064] The aerosol generating device may further comprise a controller configured to control the operation of the device. In particular, the controller may be configured to control the heating device, preferably in a closed loop configuration, to control the heating of the aerosol-forming substrate to a predetermined operating temperature. The operating temperature used to heat the aerosol-forming substrate may be at least 180°C, in particular at least 300°C, preferably at least 350°C, more preferably at least 370°C, and most preferably at least 400°C.

[0065] The aerosol generating device may comprise a power source, in particular a DC power source configured to provide a DC supply voltage and a DC supply current to the heating device. The power source is preferably a battery, in particular a rechargeable battery such as a lithium iron phosphate battery.

[0066] According to the present invention there is provided an aerosol generating system comprising an aerosol generating device according to the present invention as described herein and an aerosol-generating article comprising an aerosol-forming substrate, at least a part of which may be removably received or removably receivable within a chamber of the aerosol generating device.

[0067] The term "aerosol-generating article" as used herein refers to an article comprising at least one aerosol-forming substrate that releases a volatile compound capable of forming an aerosol when heated. Thus, an aerosol-generating article may be designated as a heated aerosol-generating article or an aerosol-generating article for heating. That is, the aerosol-generating article preferably comprises at least one aerosol-forming substrate that is intended to be heated, rather than combusted, to release a volatile compound capable of forming an aerosol. The aerosol-generating article may be a consumable product, in particular a consumable product that is discarded after a single use.

[0068] As used herein, the term "aerosol-forming substrate" refers to a substrate capable of releasing volatile compounds capable of forming an aerosol when heated. The aerosol-forming substrate may be a solid aerosol-forming substrate, or a gel-like aerosol-forming substrate, or a liquid aerosol-forming substrate, or a combination thereof. The aerosol-forming substrate may comprise a tobacco-containing material that contains volatile tobacco flavor compounds that are released from the substrate upon heating. Alternatively, or in addition, the aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may further comprise an aerosol former. Examples of suitable aerosol formers are glycerin and propylene glycol. The aerosol-forming substrate may also comprise other additives and ingredients, such as nicotine or flavoring substances. In particular, the liquid aerosol-forming substrate may comprise water, solvents, ethanol, plant extracts, and natural or artificial flavors. The aerosol-forming substrate may also be a paste-like material, a sachet of porous material containing the aerosol-forming substrate, or even loose tobacco mixed with, for example, a gelling or adhesive agent, which may include a common aerosol former such as glycerin, and then compressed or shaped into a plug.

[0069] The aerosol-generating article may be a tobacco article. In particular, the article may be a rod-shaped article, preferably a cylindrical rod-shaped article which may resemble a conventional cigarette. The aerosol-generating article may have a circular or elliptical or near-circular or square or rectangular or triangular or polygonal cross-section.

[0070] In one embodiment, the aerosol-generating article may be a rod-shaped article, specifically a cylindrical article comprising one or more of a distal front plug element, a base element, a first tube element, a second tube element, and a filter element.

[0071] The base element preferably comprises at least one aerosol-forming substrate to be heated and a susceptor arrangement in thermal contact or in thermal proximity to the aerosol-forming substrate. The base element may have a length of 10 mm to 14 mm, for example 12 mm. In case the aerosol generating system is based on induction heating, the base element may further comprise a susceptor in thermal contact or in thermal proximity to the aerosol-forming substrate. As used herein, the term "susceptor" refers to an element comprising a material having the ability to be inductively heated in an alternating electromagnetic field. This may be the result of at least one of hysteresis losses or eddy currents induced in the susceptor, depending on the electrical and magnetic properties of the susceptor material.

[0072] The first tube element is distal to the second tube element. Preferably, the first tube element is proximal to the base element and the second tube element is proximal to the first tube element and distal to the filter element, i.e. between the first tube element and the filter element. At least one of the first tube element and the second tube element may comprise a central air passage. The cross section of the central air passage of the second tube element may be larger than the cross section of the central air passage of the first tube element. Preferably, at least one of the first tube element and the second tube element may comprise a hollow cellulose acetate tube. At least one of the first tube element and the second tube element may have a length of 6 mm to 10 mm, for example 8 mm.

[0073] The filter element preferably functions as a mouthpiece or as part of a mouthpiece together with a second tube element. As used herein, the term "mouthpiece" refers to the portion of the article through which the aerosol exits the aerosol-generating article. The filter element may have a length of 10 millimeters to 14 millimeters, for example 12 millimeters.

[0074] The distal forward plug element may be used to cover and protect the distal forward end of the base element. The distal forward plug element may have a length of 3 mm to 6 mm, for example 5 mm. The distal forward plug element may be made of the same material as the filter element.

[0075] All of the aforementioned elements may be disposed consecutively along the length axis of the article in the order described above, with the distal forward plug element preferably disposed at the distal end of the article and the filter element preferably disposed at the proximal end of the article. Each of the aforementioned elements may be substantially cylindrical. Specifically, all of the elements may have the same external cross-sectional shape and / or dimensions.

[0076] In addition, the elements may be surrounded by one or more outer wrappers, such as to hold the elements together and to maintain the desired cross-sectional shape of the rod-like article. The wrapper is preferably made of paper. The wrapper may further comprise an adhesive that bonds the overlapping free ends of the wrappers to each other. For example, the distal forward plug element, the base element, and the first tube element may be surrounded by a first wrapper, and the second tube element and the filter element may be surrounded by a second wrapper. The second wrapper may also surround at least a portion of the first tube element (after being wrapped by the first wrapper) to connect the distal forward plug element, the base element, and the first tube element surrounded by the first wrapper to the second tube element and the filter element. The second wrapper may comprise perforations around its circumference.

[0077] If the aerosol generating device is intended for use with an aerosol generating article according to the specific embodiment described above (two support elements), the device and the article are preferably configured such that the first tube element contacts the inner sleeve surface of the contact portion of the insertion sleeve, while the distal front plug element contacts the inner chamber surface of the distal holding portion of the chamber or the inner sleeve surface of the distal sleeve portion of the insertion sleeve, respectively. The base element is surrounded by the non-contact portion of the chamber or the insertion sleeve, respectively, but is not in contact with the inner chamber surface or the insertion sleeve. The first tube element may preferably have a length in a direction along the longitudinal axis of the article that corresponds to the length of the insertion sleeve, in particular the length of the contact portion along the central axis of the chamber. Similarly, the distal front plug element may have a length in a direction along the longitudinal axis of the article that corresponds to the length of the holding portion or the distal sleeve portion of the chamber along the central axis of the chamber. Thus, the base element may have a length in a direction along the longitudinal axis of the article that corresponds to the length of the non-contact portion of the chamber or the insertion sleeve along the central axis of the chamber. Alternatively, at least one of the insertion sleeve, in particular the contact portion, and the chamber or the retaining portion of the distal sleeve portion may have a length extension in the respective direction towards the base element that is greater than the respective length extension of the first tube element or the distal forward plug element so as to at least partially contact the base element.

[0078] Either of the aforementioned configurations is advantageous for several reasons. First, the airflow in the proximal portion of the airflow path is optimized with respect to withdrawal resistance. Additionally, the airflow within the airflow path is preheated due to the close proximity of the airflow path to the aerosol-generating article. The contact portion of the sleeve further ensures that the article is held securely within the chamber without the risk of it slipping or falling out of the device.

[0079] Further features and advantages of the aerosol generating system and aerosol generating article according to the invention have already been described above with reference to the aerosol generating device and apply equally.

[0080] The present invention is defined in the claims. However, below is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of the other examples, embodiments, or aspects described herein. EXAMPLES

[0081] Example 1: An aerosol generating device for use with an aerosol-generating article, the device comprising a chamber within a device housing for removably receiving at least a portion of the aerosol-generating article, the chamber having an inner chamber surface and a proximal open end for inserting the article into the chamber, the device further comprising an insertion sleeve separate from the device housing and fixedly disposed within the device such that at least a portion of the insertion sleeve extends along at least a proximal portion of the inner chamber surface, the insertion sleeve comprising an outer sleeve surface and an inner sleeve surface, the inner sleeve surface being configured at a contact portion of the insertion sleeve to be in circumferential contact with the periphery of the aerosol-generating article when received within the chamber, and at least a proximal portion of an airflow path through the device extending along the outer sleeve surface. Example 2: 2. An aerosol generating device as described in Example 1, wherein a proximal portion of the airflow path is formed at least partially between the outer surface of the sleeve and the inner surface of the chamber. Example 3: An aerosol generating device as described in any one of Examples 1 to 2, wherein the insertion sleeve has a plurality of airflow channels arranged along the circumference of the outer surface of the sleeve, the airflow channels forming part of the proximal portion of the airflow path. Example 4: 4. The aerosol generation device of example 3, wherein the plurality of airflow channels extend substantially along the length extension of the insertion sleeve. Example 5: An aerosol generating device according to any one of the preceding claims, wherein the airflow channels are formed between adjacent ridges spaced apart from one another along the insertion periphery of the sleeve. Example 6: 6. The aerosol generation device of example 5, wherein the ridges protrude radially outward from the central axis of the insertion sleeve. Example 7: An aerosol generating device described in either Example 5 or Example 6, wherein the protuberances are in contact with the inner surface of the chamber. Example 8: An aerosol generating device according to any one of Examples 5 to 7, wherein the ridge extends beyond the distal edge of the insertion sleeve. Example 9: An aerosol generating device described in any one of Examples 5 to 9, wherein the ridge extends beyond the proximal edge of the insertion sleeve. Example 10: An aerosol generation device as described in any one of Examples 3 or 4, wherein the airflow channels are formed by grooves on the outer surface of the sleeve. Example 11: An aerosol generating device according to any one of Examples 1 to 10, wherein the chamber is formed as a sleeve, preferably having a distal closed end, or a barrel received within a cavity within a proximal portion of the device housing. Example 12: An aerosol generating device according to any one of Examples 1 to 11, wherein the insertion sleeve comprises an intake portion at a proximal end of the insertion sleeve, preferably the intake portion protruding proximally beyond the proximal end of the chamber. Example 13: An aerosol generating device as described in Example 12, wherein the inner cross-sectional area of ​​the insertion sleeve increases in the proximal direction along at least a portion of the intake portion, and preferably the inner surface of the sleeve comprises one of a frusto-conical shape or a funnel shape within the intake portion. Example 14: An aerosol generating device as described in either Example 12 or Example 13, wherein the intake portion has one or more air intake ports for air to enter the proximal portion of the airflow path along the outer surface of the sleeve, particularly into the airflow channel on the outer surface of the sleeve. Example 15: An aerosol generating device described in any one of Examples 3 to 14, wherein the airflow channel terminates in a proximal direction distal to the proximal edge of the insertion sleeve and is therefore accessible from outside the insertion sleeve only in a radially inward direction, in particular in a radially inward direction (relative to the length extension of the insertion sleeve). Example 16: An aerosol generating device described in any one of Examples 3 to 15, wherein the air flow channel terminates in a proximal direction distal to the proximal edge of the insertion sleeve and therefore the air intake is accessible only in a radially inward direction, particularly in a radially inward direction (relative to the length extension of the insertion sleeve), particularly from outside the insertion sleeve. Example 17: An aerosol generating device described in any one of Examples 3 to 14, wherein the airflow channel extends proximally (along the entirety) to the proximal edge of the insertion sleeve and is therefore accessible (from outside the insertion sleeve) in at least one of a distal direction and a radially inward direction (relative to the length extension of the insertion sleeve). Example 18: An aerosol generating device described in any one of Examples 3 to 14, wherein the air flow channel extends proximally (along the entirety) to the proximal edge of the insertion sleeve, thus providing an air intake accessible in at least one of a distal direction and a radially inward direction (relative to the length extension of the insertion sleeve). Example 19: An aerosol generating device described in either Example 17 or Example 18, wherein the airflow channel tapers toward the proximal edge of the insertion sleeve in at least one of the width extension of the airflow channel and the depth extension of the airflow channel. Example 20: An aerosol generating device described in any one of Examples 3 to 14, wherein the insertion sleeve has one or more through holes in the intake portion (in particular, the insertion sleeve has, for each airflow channel, a through hole in the intake portion that is fluidly connected to the respective airflow channel), and the through holes (forming air intakes) allow air to enter the proximal part of the airflow path, in particular the airflow channels, from inside the insertion sleeve, in particular from inside the intake portion. Example 21: An aerosol generating device described in any one of Examples 3 to 14, wherein one or more air intake ports are formed by one or more through holes through the insertion sleeve, particularly the intake portion, which allow air to enter the proximal portion of the airflow path, particularly the airflow channel, from inside the insertion sleeve, particularly from inside the intake portion. Example 22: An aerosol generating device described in any one of Examples 3 to 14, wherein the insertion sleeve has one or more axial recesses at the proximal end of the insertion sleeve, in particular at the proximal edge of the insertion sleeve, and the recesses (forming air intakes) allow air to enter the proximal part of the airflow path, in particular the airflow channel, from inside the insertion sleeve, in particular from inside the intake part. Example 23: An aerosol generating device as described in any one of Examples 3 to 14, wherein the insertion sleeve has an axial recess in or at the proximal end of the insertion sleeve, in particular the proximal edge of the insertion sleeve, in fluid communication with each airflow channel, the recess (forming an air intake) allowing air to enter the proximal part of the airflow path from inside the insertion sleeve, in particular from inside the intake part. Example 24: An aerosol generating device described in any one of Examples 3 to 14, wherein the one or more air intake ports are formed by one or more axial recesses in or at the proximal end of the insertion sleeve, in particular the proximal edge of the intake portion, which recesses allow air to enter the proximal part of the airflow path, in particular the airflow channel, from inside the insertion sleeve, in particular from inside the intake portion. Example 25: An aerosol generating device described in any one of Examples 22 to 24, wherein the recesses are formed by respective gaps between the proximal end portions of the proximally extending ridges at the proximal end of the insertion sleeve. Example 26: 22. An aerosol generating device according to any one of the preceding claims, wherein the insertion sleeve comprises a circumferential collar at the proximal end of the insertion sleeve. Example 27: 27. An aerosol generation device as described in Example 26, wherein the collar circumferentially closes the airflow channel (if present) in the proximal direction. Example 28: An aerosol generating device as described in either Example 26 or Example 27, wherein the ridges meet radially flush with the periphery of the collar. Example 29: An aerosol generating device as described in either Example 26 or Example 27, wherein the collar is a turnover collar including a turnover collar portion surrounding the intake portion spaced from the sleeve outer surface of the intake portion. Example 30: 30. The aerosol generating device of example embodiment 29, wherein the ridge extends into the space between the turnover collar portion and the intake portion. Example 31: 31. An aerosol generating device according to any one of the preceding embodiments, wherein the insertion sleeve comprises a support structure that provides a form-fit with a corresponding support structure of a correspondingly shaped chamber. Example 32: An aerosol generating device described in any one of Examples 1 to 31, wherein a distal portion of the airflow path is formed between a distal portion of the chamber inner surface and an outer surface of a distal portion of the article located outside the insertion sleeve when the article is received within the chamber, and the distal portion of the airflow path is fluidly connected to a proximal portion of the airflow path. Example 33: An aerosol generating device as described in Examples 1 to 32, wherein the insertion sleeve has a non-contact portion disposed distal to the contact portion, and the inner cross-sectional area of ​​the insertion sleeve within the non-contact portion is larger than the inner cross-sectional area of ​​the insertion sleeve within the contact portion. Example 34: An aerosol generating device as described in Example 33, wherein the insertion sleeve has a distal sleeve portion disposed distal to the non-contact portion, and the inner sleeve surface within the distal sleeve portion is configured to contact the periphery of the aerosol generating article, particularly the periphery of the distal end portion of the aerosol generating article, when received within the chamber. Example 35: An aerosol generating device as described in Example 34, wherein the insertion sleeve comprises a first sleeve segment including a contact portion, a second sleeve segment including a non-contact portion, and a third sleeve segment including a distal sleeve portion, and the first sleeve segment, the second sleeve segment, and the third sleeve segment are separate parts from each other. Example 36: An aerosol generating system comprising an aerosol generating device according to any one of Examples 1 to 35 and an aerosol-generating article comprising an aerosol-forming substrate, wherein at least a portion of the aerosol-generating article is removably received or removably receivable within a chamber of the aerosol generating device.

[0082] The invention will now be described, by way of example only, with reference to the accompanying drawings in which: [Brief description of the drawings]

[0083] [Figure 1a] FIG. 1a shows a chamber with an insertion sleeve for use in an aerosol generating device according to a first embodiment of the present invention. [Figure 1b] FIG. 1b shows a cross-sectional view of the embodiment of FIG. 1a. [Figure 1c] FIG. 1c shows the embodiment of FIG. 1b when an aerosol-generating article is at least partially received within the chamber. [Figure 2a] 2a-2b show isometric views of the insertion sleeve of the embodiment shown in FIGS. 1a-1c. [Figure 2b] Same as above. [Figure 2c] 2c-2d show isometric views of an alternative embodiment of the insertion sleeve according to FIGS. 1a-1c. [Figure 2d] Same as above. [Figure 3a] FIG. 3a shows the assembly of an insertion sleeve into a chamber according to the embodiment shown in FIGS. 1a-1c. [Figure 3b] FIG. 3b shows an exploded view of certain details of an aerosol generating device according to the invention. [Figure 4a] FIG. 4a shows a cross-sectional view of the device according to FIG. 3b. [Figure 4b] FIG. 4b shows a front view of the proximal end of the device according to FIG. 4a along the central axis of the sleeve. [Figure 4c] FIG. 4c shows an apparatus according to FIG. 4a when an aerosol-generating article is at least partially received within the chamber. [Figure 5a] FIG. 5a shows an insertion sleeve according to a second embodiment. [Figure 5b] FIG. 5b shows a cross-sectional view of a sleeve according to FIG. 5a inserted into a chamber. [Figure 5c] FIG. 5c shows an isometric view of the embodiment according to FIG. 5b. [Figure 5d] FIG. 5d shows the embodiment of FIG. 5b when an aerosol-generating article is at least partially received within the chamber. [Figure 6a] FIG. 6a shows an insertion sleeve according to a third embodiment. [Figure 6b] FIG. 6b shows the embodiment of FIG. 6a when an aerosol-generating article is at least partially received within the chamber. [Figure 6c] FIG. 6c is a front view of the proximal end of the device of FIG. 6b. [Figure 6d] FIG. 6d shows a perspective view of the embodiment of FIG. 6b. [Figure 7a] 7a-7b show isometric views of an insertion sleeve according to a third embodiment. [Figure 7b] Same as above. [Figure 7c] FIG. 7c shows a cross-sectional view of a chamber with a sleeve according to FIGS. 7a-7b along the central axis of the sleeve. [Figure 7d]FIG. 7d shows a front view of the proximal end of a chamber according to the embodiment of FIG. 7c. [Figure 7e] Figures 7e-7f show further details of the embodiment of Figures 7c-7d. [Figure 7f] Same as above. [Figure 8a] FIG. 8a shows an exploded view of the insertion sleeve and chamber according to the fourth embodiment. [Figure 8b] FIG. 8b shows an aerosol generating device comprising the insertion sleeve and chamber of FIG. 8a. [Figure 9a] 9a-9b show isometric views of an insertion sleeve according to a fifth embodiment. [Figure 9b] Same as above. [Figure 10a] 10a-10b show isometric views of an insertion sleeve according to a sixth embodiment. [Figure 10b] Same as above. [Figure 11a] 11a-11b show isometric views of an insertion sleeve according to a seventh embodiment. [Figure 11b] Same as above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0084] Figures 1a-1c show a first embodiment of a chamber 110 with an insertion sleeve 130 for use in an aerosol generating device according to the present invention. Further details of the aerosol generating device, in particular the chamber 110 and the insertion sleeve 130, are shown in Figures 2a-2b, 3a-3b and 4a-4c and will be further described below. Figure 1a shows a front view taken along the chamber central axis 117, while Figure 1b shows a cross-sectional side view of the arrangement. As can be seen particularly in Figure 1b, the insertion sleeve 130 is disposed at least partially inserted within the chamber 110. Figure 1c further shows an aerosol-generating article 170, a portion of which is received within the insertion sleeve 130 and the chamber 110.

[0085] The chamber 110 has an inner chamber surface 113 and an outer chamber surface 114. A proximal open end 115 of the chamber allows for the insertion of an article 170 into the chamber 110. When the article is received within the chamber 110, a first airflow path 180 is formed between the inner chamber surface 113 and the aerosol-generating article 170, as shown in FIG. 4c. As further seen in FIG. 4c, the first airflow path 180 is in fluid communication with a second return airflow path 188 inside the article 170. As used herein, the term "airflow path" refers primarily to the first airflow path 180. The first airflow path 180 and the second airflow path 188 are fluidly connected via a free space between one or more stops 118 disposed at the distal end 123 of the chamber 110. The stop 118 provides an abutment to prevent the aerosol-generating article from being inserted all the way into the distal end of the chamber, thus allowing the airflow to change direction from the distal direction of the first airflow path to the proximal direction of the second airflow path 188.

[0086] As can be particularly seen in Figure 4a, the insertion sleeve 130 is an element separate from the device housing 103 and separate from the chamber 110. That is, the sleeve 130, the device housing 103, and the chamber 110 are separate elements. Upon assembly, the sleeve 130 is fixedly disposed within the device 101 such that at least a portion of the insertion sleeve 130 extends along at least a proximal portion 111 of the chamber inner surface 113 (see Figure 1c).

[0087] The insertion sleeve 130 comprises a sleeve outer surface 136 and a sleeve inner surface 134 (see Figures 2a and 2b). The insertion sleeve 130 is arranged coaxially with the chamber 110. Thus, the sleeve length extension 131 of the insertion sleeve 130 is parallel to the chamber central axis 117. At the contact portion 135 of the insertion sleeve 130, the sleeve inner surface 134 is arranged in intimate circumferential contact with the circumference of the aerosol-generating article 170 when the article 170 is received in the chamber (see Figures 1c, 4a, and 4c). To this end, the article 170 has an outer cross-sectional shape that corresponds at least to the inner cross-sectional shape of the contact portion 135. In particular, the diameter of the outer cross-sectional shape of the article 170 corresponds at least to the diameter of the inner cross-sectional shape of the contact portion 135. Thus, the article 170 is firmly held in the chamber 110 by the contact portion 135. At the same time, the circumferentially closed contact provides a sealing contact between the outer surface of the article 170 and the inner sleeve surface 134 in the contact portion 135 along the circumference of the article. As a result, the sealing contact prevents or at least limits airflow through the proximal portion of the chamber 110 between the outer surface of the article 170 and the inner sleeve surface 134 in the contact portion 135. Instead, in accordance with the present invention, the airflow path 180 through the proximal portion of the chamber 110, i.e., the proximal portion 181 of the airflow path 180, extends along the sleeve outer surface 136. More specifically, the proximal portion 181 of the airflow path 180 is at least partially formed between the sleeve outer surface 136 and the chamber inner surface 113 (see FIG. 4c).

[0088] 2a-2b, the insertion sleeve 130 includes a plurality of airflow channels 132 disposed along the circumference of the sleeve outer surface 136. The airflow channels 132 form a portion of a proximal portion 181 of an airflow path 180. The plurality of airflow channels 132 extend substantially along a length extension 131 of the insertion sleeve 130 from a proximal end 143 to a distal end 144 of the insertion sleeve 130, particularly from a proximal edge 142 to a distal edge 141 of the insertion sleeve 130. The chamber 110 has a length extension 119 parallel to and along a central axis 117 of the chamber 110.

[0089] In this embodiment, the airflow channels 132 are formed between adjacent ridges 137 that are spaced apart from one another along the circumference of the insertion sleeve 130 (on the outside of the insertion sleeve 130). The ridges 137 project radially outward from a central axis 140 of the insertion sleeve 130 to contact the chamber inner surface 113 such that the insertion sleeve 130 is supported radially within the chamber 110 via the ridges 137. Furthermore, the insertion sleeve 130 comprises a support structure 155 that provides a form fit with a corresponding support structure 120 of the correspondingly formed chamber 110. In this embodiment (see FIG. 1b), the support structure 155 is formed by a ring member that projects beyond the ridges 137 in a radially outward direction.

[0090] As shown in Figure 1b and also in Figures 4c, 5d, 6b and 8b, the aerosol-generating article 170 is a rod-like article 170 having a substantially cylindrical shape. The article 170 according to this embodiment comprises the following cylindrical elements arranged sequentially along the length axis of the article 170: a distal front plug element 172, a base element 173, a first tube element 174, a second tube element 175 and a filter element 176. The details of these elements have already been described in detail above. The distal front plug element 172, the base element 173 and the first tube element 174 are surrounded by a first wrapper, and the second tube element 175 and the filter element 176 are surrounded by a second wrapper. The second wrapper also surrounds at least a portion of the first tube element 174 (after being wrapped by the first wrapper) and connects the distal forward plug element 172, the base element 173 and the first tube element 174 (which is surrounded by the first wrapper) to the second tube element 175 and the filter element 176. As shown in Figure 4c, the article 170 of this embodiment is an inductively heatable article comprising a susceptor element 127 configured to heat an aerosol-forming substrate in the base element 173 by inductive heating.

[0091] When the article 170 is received within the chamber 110, the first tube element 174 is at least partially surrounded by the sleeve inner surface 134 of the contact portion 135, and the article outer surface 171 is parallel to the contact portion 135. More specifically, the inner surface (at least a section) within the contact portion 135 is in circumferential, closed-face contact with the wrapper around the first tube element 174 such that airflow along that portion of the article 170 is prevented. Thus, the insertion sleeve 130 with its contact portion 135 prevents air from being absorbed by that portion of the article 170 when the user takes a puff.

[0092] For example, in the distal retention portion 122 shown in Figures lb and lc, the chamber 110 includes a retention rib 116 extending radially toward a central axis 117 of the chamber 110. The retention rib 116 is configured to contact a distal portion of a received article 170 to retain the article 170 within the chamber 110, preferably during any spatial orientation of the chamber 110. The retention rib 116 extends along the central axis 117 of the chamber 110 and projects radially inward beyond a distal portion 114 of the sleeve inner surface 113. The retention rib 116 is preferably formed integrally with the chamber 110.

[0093] Between the distal retention portion 122 and the proximal portion, the chamber 110 comprises a non-contact portion having a larger inner cross-sectional shape than the distal retention portion 122 and the insertion sleeve 130. Thus, the inner chamber surface in the non-contact portion is spaced from the outer surface of the aerosol-generating article 170 when received within the chamber 110. Advantageously, this prevents the outer surface of the component of the article 170 from being affected by condensation that may form on the inner chamber surface.

[0094] 1a-1d and 2a-2b, the insertion sleeve 130 comprises an intake portion 133 at a proximal end 143 (particularly at a proximal edge 142) of the insertion sleeve 130. The intake portion 133 preferably projects proximally beyond the proximal end 115 of the chamber 110. The inner cross-sectional area of ​​the insertion sleeve 130 increases in the proximal direction along at least a portion of the intake portion 133. The sleeve inner surface 134 comprises one of a frusto-conical or funnel shape at the intake portion 133. Advantageously, the frusto-conical shape provides guidance for the aerosol-generating article 170 during insertion into the device.

[0095] As can be particularly seen in FIG. 2b, the insertion sleeve 130 includes a plurality of through holes 149 in the intake portion 133, one for each airflow channel 132, to provide individual fluid communication to each airflow channel 132. The through holes 149 form air inlets 145 and allow air to enter from inside the intake portion 133 into a proximal portion 181 of an airflow path 180 formed by the airflow channels 132. Thus, the airflow channels 132 are accessible for the incoming airflow to enter at least in a direction along the sleeve central axis 140.

[0096] The insertion sleeve 130 further comprises a circumferential collar 139 at a proximal end 143 of the insertion sleeve 130. In this embodiment, the collar 139 is a turnover collar that includes a turnover collar portion surrounding the intake portion 133 spaced from the sleeve outer surface 136 of the intake portion 133 (see also FIGS. 1b-1c). A ridge 137 that forms the airflow channel 132 extends into the space between the turnover collar portion of the turnover collar and the intake portion 133.

[0097] While Figures 1a-1d and 2a-2b show an insertion sleeve 130 having twelve ridges 137 and therefore twelve airflow channels and twelve through holes 149 / air intakes 145, Figures 2c-2d show an alternative embodiment of the insertion sleeve having five ridges 137 and therefore five airflow channels and five through holes 149 or air intakes 145, respectively.

[0098] As further explained above and shown in Figures 1a-1d, 3a-3b, and 4a-4c, the chamber 110 in this embodiment is formed as a sleeve having a closed distal end, or equivalently as a barrel that is received within a cavity 105 in the proximal portion 104 of the device housing 103.

[0099] 3a-3b show exploded views of the proximal part 104 of the aerosol generating device, which show the assembly of the chamber 110 and the insertion sleeve 130 into the cavity 105 in the proximal part 104 of the device housing 103, thus obtaining the aerosol generating device shown in FIGS. 4a-4c. Upon insertion of the chamber 110 into the cavity 105, the sleeve 130 is inserted into the chamber 110. A sealing member 108 is then provided at least partially between the chamber 110 and the insertion sleeve 130 to prevent airflow passing along the outer surface of the chamber 110. The chamber 110, the sleeve 130 and the sealing member 108 are fixedly fixed to the device housing 103 by a fixing ring 106. In this embodiment, the fixing ring 106 is a threaded ring configured to engage with a correspondingly formed threaded portion of the device housing 103. Finally, a ring-shaped proximal cap 107 is attached to the proximal end face at the proximal end of the device 101 and covers the proximal end face. The proximal cap 107 comprises a respective insertion opening 124 for inserting the aerosol-generating article 170 through the open proximal end of the chamber 110. The proximal cap 107 is preferably configured to be coupled to the retaining ring 106. As can be seen particularly in Figures 3b and 4b, the cross-sectional shape of the insertion opening 124 of the proximal cap 107 is non-circular. In particular, the proximal cap 107 comprises a protrusion 126 that protrudes radially of the sleeve 130 so as to at least partially cover the inlet 145 along the distal direction, as shown, for example, in Figure 4b.

[0100] 5a-5d show details of an aerosol generating device according to the invention, comprising an insertion sleeve 530 according to a second embodiment. Generally, the embodiment according to Figs. 5a-5d is very similar to the embodiment shown in Figs. 1a-4c. Therefore, identical or similar features are indicated with the same reference numbers, but incremented by 400. In contrast to the embodiment of the insertion sleeve 130 shown in Figs. 1a-4c, the insertion sleeve 530 according to the second embodiment shown in Figs. 5a-5d does not comprise a collar at its proximal end, in particular a turnover circumferential collar. Instead, the airflow channel 532 extends proximally to the proximal edge 542 of the insertion sleeve 530 and is therefore accessible from the outside of the insertion sleeve 530 in at least one of a distal direction and a radially inward direction with respect to the length extension of the insertion sleeve 530. As can be seen particularly in FIG. 5a, the airflow channel 532 tapers toward the proximal edge 542 of the insertion sleeve in at least one of the width extension of the airflow channel 532 and the depth extension of the airflow channel 532. This configuration allows the airflow channel 532 in the intake section 533 to expand in the distal direction, which may be beneficial to the aerodynamic properties of the intake section 533. The airflow channel 532 also tapers in the opposite distal direction. In particular, the airflow channel 532 tapers downstream of the support structure 555 of the insertion sleeve 530. As can also be seen in FIG. 5a, the ridge 537 extends beyond the distal edge 541 of the sleeve 530.

[0101] 6a-6d show details of another aerosol generating device according to the invention, comprising an insertion sleeve 630 according to a third embodiment. Generally, the embodiment according to Figs. 6a-6d is very similar to the embodiment shown in Figs. 5a-5d. Therefore, identical or similar features are indicated with the same reference numbers, but incremented by 100. As in Figs. 5a-5d, the airflow channel 632 extends proximally to the proximal edge 642 of the insertion sleeve 630, and is therefore accessible from outside the insertion sleeve 630 in at least one of the distal direction and the radially inward direction relative to the length extension of the insertion sleeve 630. In contrast to the embodiment shown in Figs. 5a-5d, the insertion sleeve 630 comprises a ridge 637 extending beyond the proximal edge 642 of the insertion sleeve 630. The gap between the protruding proximal ends of the ridges 637 forms an axial recess 646 at the proximal end of the insertion sleeve. Each axial recess 646 is in fluid communication with a respective airflow channel 632, thus forming a respective air inlet 645, allowing air to enter the proximal portion 681 of the airflow path 680 from inside the intake portion 633. As can be derived from FIG. 6a, the proximal edge 642 and proximal end portion 651 of the ridge 637 form a discontinuous rim at the proximal end 653 of the sleeve 630.

[0102] Figures 7a-7f show details of yet another aerosol generating device according to the invention, comprising an insertion sleeve 730 according to a fourth embodiment. As with the previous embodiment, the embodiment according to Figures 7a-7f is also very similar to the embodiment shown in Figures 5a-5d. Therefore, identical or similar features are indicated with the same reference numbers, but incremented by 200. In contrast to the embodiment according to Figures 5a-5d, the airflow channel 732 of the embodiment according to Figures 7a-7f does not extend to the proximal edge 742 of the insertion sleeve 730, but rather terminates in a proximal direction distal to the proximal edge 742. The airflow channel is therefore accessible from outside the insertion sleeve 730 only in a radially inward direction relative to the length extension 731 of the insertion sleeve 730, but not directly in a distal direction. This is achieved by a collar 739 that closes the airflow channel 732 in a proximal direction. 7a-7b, ridge 737 extends proximally to meet radially flush or substantially flush with the circumference of collar 739. In this embodiment, air inlet 745 is provided on the inside of the device. More specifically, air inlet 745 is at least partially covered by locking ring 706 radially of inert sleeve 730.

[0103] 8a-8b show yet another alternative embodiment of the insertion sleeve 830 based on the embodiment shown in Figs. 1a-4c. Identical or similar features are therefore indicated with the same reference numbers, but incremented by 700. In contrast to the embodiment according to Figs. 1a-4c, the insertion sleeve 830 extends further in the distal direction beyond the proximal portion of the chamber 810. More specifically, the insertion sleeve comprises three segments, namely a first sleeve segment 856 comprising a contact portion 835, a second sleeve segment 857 comprising a non-contact portion 859, and a third sleeve segment 858 comprising a distal sleeve portion 860. The first sleeve segment 856, the second sleeve segment 857, and the third sleeve segment 858 are separate parts from each other. The inner cross-sectional area of ​​the insertion sleeve 830 in the non-contact portion 859 is larger than the inner cross-sectional area of ​​the insertion sleeve 830 in the contact portion 835, such that the sleeve inner surface in the non-contact portion 859 is spaced from the received article 870. This configuration is beneficial in reducing or avoiding the effects of undesirable condensation on the outer surface of the article 870, which is particularly important with respect to the outer surface around the base element. The inner sleeve surface 834 in the distal sleeve portion 860 contacts the periphery of the aerosol-generating article 870, and in particular the periphery of the distal end portion, to retain the article 870 within the chamber 810 and radially position the article 870. For both purposes, the inner sleeve surface 834 in the distal sleeve portion 860 includes a plurality of protrusions configured to contact the aerosol-generating article 870. For example, the plurality of protrusions may comprise retaining ribs.

[0104] Figures 9a-9b show a fifth embodiment of an insertion sleeve 130, which is similar to the two embodiments of the insertion sleeve according to Figures 1a-1d, 2a-2b and 2c-2d, respectively. Similar or identical features are therefore indicated with the same reference numbers. Figures 1a-1d, 2a-2b and 2c-2d show an embodiment of an insertion sleeve 130 with twelve and five bumps 137, respectively, while Figures 9a-9b show an insertion sleeve with ten bumps 137, and therefore ten air flow channels and ten through holes 149 or air intakes 145, respectively. Moreover, in contrast to the embodiment shown in Figures 1a-1d, 2a-2b and 2c-2d, the insertion sleeve 130 shown in Figures 9a-9b has a smaller length extension. In Figures 9a-9b, the length extension of the insertion sleeve may be, for example, in the range of 4.5 mm to 5 mm. As can be further seen in Figures 9a-9b, one or more ring-shaped ridges may be provided on the inner surface of the contact portion 135, which is in circumferential contact with the periphery of the aerosol-generating article, so as to exert an annular retention force on the article when received in the chamber. The inner diameter of the ring-shaped ridge may vary along the axial direction of the insertion sleeve. In particular, the inner cross-sectional shape of the ring-shaped ridge may decrease, in particular smoothly decrease, in the distal direction along the axial direction of the insertion sleeve. The inner cross-sectional shape of the ring-shaped ridge may smoothly decrease in the distal direction starting from a maximum inner cross-sectional shape of the contact portion 135 towards a minimum inner cross-sectional shape, and then preferably increases abruptly again, in particular forming a sharp distal edge of the ring-shaped ridge.

[0105] 10a-10b show a sixth embodiment of an insertion sleeve 730, similar to the embodiment of the insertion sleeve shown in FIGS. 7a-7b. Thus, similar or identical features are indicated with the same reference numbers. As in FIGS. 7a-7b, the airflow channel 732 in the embodiment according to FIGS. 10a-10b does not extend to the proximal edge 742 of the insertion sleeve 730, but rather terminates in a proximal direction distal to the proximal edge 742. Thus, the airflow channel is accessible from the outside of the insertion sleeve 730 only in a radially inward direction relative to the length extension 731 of the insertion sleeve 730, but not directly in a distal direction. This is achieved by a collar 739 that closes the airflow channel 732 in a proximal direction. As shown in FIGS. 7a-7b, the ridge 737 extends proximally relative to the collar 739, but does not meet radially flush with the circumference of the collar 739. In contrast to the embodiment shown in Figures 7a-7b, the insertion sleeve 730 shown in Figures 10a-10b has a smaller length extension. In further contrast, the insertion sleeve 730 shown in Figures 10a-10b has only eight ridges 737, and correspondingly eight airflow channels 732, rather than twelve as in Figures 7a-7b.

[0106] 11a-11b show a seventh embodiment of an insertion sleeve 930, similar to the embodiment of the insertion sleeve 730 shown in Figs. 10a-10b. Similar or identical features are therefore indicated with the same reference numbers, but incremented by 200. As in Figs. 10a-10b, the insertion sleeve 930 according to Figs. 11a-11b has eight ridges 937 and, accordingly, eight airflow channels 932. In contrast to the embodiment according to Figs. 10a-10b, adjacent ridges 937 and adjacent airflow channels 932 of the insertion sleeve 930 according to Figs. 11a-11b have alternating greater and smaller widths. Moreover, in contrast to the embodiment according to Figs. 10a-10b, the insertion sleeve 930 comprises a support structure 955 formed by a ring member protruding beyond the ridges 937 in the radially outward direction. The ring-shaped support structure 955 is similar to the ring-shaped support structure 155 of the insertion sleeve 130 shown in Figs. 1a-1d, 2a-2b, and 2c-2d, respectively, but is stronger and therefore provides a better thingness of the sealing member. However, the insertion sleeve 930 shown in Figs. 11a-11b does not include a turn-over collar, as the insertion sleeves in Figs. 1a-1d, 2a-2b, and 2c-2d, respectively, do. Rather, the insertion sleeve 930 according to Figs. 11a-11b comprises through holes 949 formed between the ring-shaped support structure 955, the ridge 937, and the bottom of the airflow channel 932, one for each airflow channel 932. Each through hole 949 provides an individual fluid communication for each airflow channel 932. More specifically, the through holes 949 form air inlets 945 that allow air to enter the proximal portion of the airflow path formed by the airflow channel 932 from outside the insertion sleeve 930 in a direction along the sleeve central axis 140, whereas in Figures 1a-1d, 2a-2b and 2c-2d, air enters the proximal portion of the airflow path formed by the airflow channel 132 from inside the insertion sleeve 130. Thus, the air inlets 945 in Figures 11a-11b may be referred to as external air inlets 945, whereas the air inlets 145 in Figures 1a-1d, 2a-2b and 2c-2d may be referred to as internal air inlets 145.Advantageously, the external air inlet 945 ensures that there is no contact between the airflow and the aerosol-generating article in the proximal portion of the chamber.

[0107] For purposes of this specification and the appended claims, unless otherwise indicated, all numbers expressing amounts, quantities, percentages, and the like are understood to be modified in all instances by the term "about." Also, all ranges include the maximum and minimum points disclosed, and include any intermediate ranges therein, which may or may not be specifically recited herein. Thus, in this context, the number A is understood as A ± 5 percent of A. Within this context, the number A may be considered to include values ​​that are within the typical standard error for the measurement of the property that the number A modifies. The number A may, in some cases, as used in the appended claims, deviate by the percentages recited above, provided that the amount by which A deviates does not materially affect the basic and novel properties of the claimed invention. Also, all ranges include the maximum and minimum points disclosed, and include any intermediate ranges therein, which may or may not be specifically recited herein.

Claims

1. Aerosol generating device for use with an aerosol generating article, wherein the device comprises a chamber in a device housing for removably receiving at least a portion of the aerosol generating article, the chamber having an inner surface and a proximal open end for inserting the article into the chamber, the device further comprises an insertion sleeve separated from the device housing, the insertion sleeve having opposing open ends, the insertion sleeve being fixedly disposed within the device such that it cannot be placed in the device and at least a portion of the insertion sleeve extends along at least a proximal portion of the inner surface of the chamber, the insertion sleeve comprising an outer surface and an inner surface, the contact portion of the insertion sleeve configured such that when received in the chamber, the inner surface of the sleeve is in close contact with the circumferential surroundings of the aerosol generating article, and at least a proximal portion of the airflow path through the device extends along the outer surface of the sleeve.

2. The aerosol generator according to claim 1, wherein the proximal portion of the airflow path is at least partially formed between the outer surface of the sleeve and the inner surface of the chamber.

3. The aerosol generator according to claim 1, wherein the insertion sleeve comprises a plurality of airflow channels arranged along the periphery of the outer surface of the sleeve, and the airflow channels form a portion of the proximal portion of the airflow path.

4. The aerosol generator according to claim 3, wherein the airflow channel is formed between adjacent ridges separated by gaps along the periphery of the insertion sleeve, and the ridges are preferably in contact with the inner surface of the chamber.

5. The aerosol generator according to claim 1, wherein the insertion sleeve has an intake portion at its proximal end, and the intake portion preferably has one or more air intake ports for air to enter the proximal portion of the airflow path along the outer surface of the sleeve, and in particular for air to enter the airflow channel on the outer surface of the sleeve.

6. The aerosol generator according to claim 3, wherein the airflow channel terminates in the proximal direction distal to the proximal edge of the insertion sleeve, and is therefore accessible from the outside of the insertion sleeve only in a radially inward direction, particularly with respect to the length extension of the insertion sleeve.

7. The aerosol generator according to claim 3, wherein the airflow channel extends in the proximal direction to the proximal edge of the insertion sleeve, and is therefore accessible from the outside of the insertion sleeve in at least one of the distal and radially inward directions relative to the length extension of the insertion sleeve.

8. The aerosol generator according to claim 3, wherein the insertion sleeve is provided with one or more through holes, particularly within the intake portion, and the through holes allow air to enter the proximal portion of the airflow path, particularly the airflow channel, from the inside of the insertion sleeve, particularly from the inside of the intake portion.

9. The aerosol generator according to claim 3, wherein the insertion sleeve is provided with one or more axial recesses on its proximal edge, the recesses enabling air to enter the proximal portion of the airflow path, particularly the airflow channel, from the inside of the insertion sleeve, particularly from the inside of the intake portion.

10. The aerosol generating apparatus according to claim 1, wherein the insertion sleeve is provided with a circumferential collar at the proximal end of the insertion sleeve.

11. The aerosol generator according to claim 10, wherein the circumferential collar closes the airflow channel in the proximal direction.

12. The aerosol generator according to claim 10, wherein the color is a turnover color that includes a turnover color portion surrounding the intake portion, spaced apart from the outer surface of the sleeve within the intake portion.

13. The aerosol generator according to any one of claims 1 to 12, wherein the insertion sleeve comprises a non-contact portion disposed distal to the contact portion, and the inner cross-sectional area of ​​the insertion sleeve within the non-contact portion is greater than the inner cross-sectional area of ​​the insertion sleeve within the contact portion.

14. The aerosol generating apparatus according to claim 13, wherein the insertion sleeve comprises a distal sleeve portion disposed distal to the non-contact portion, and the inner surface of the sleeve within the distal sleeve portion is configured to contact the periphery of the aerosol generating article, particularly the periphery of the distal end portion of the aerosol generating article, when it is received in the chamber.

15. The aerosol generator according to claim 14, wherein the insertion sleeve comprises a first sleeve segment including the contact portion, a second sleeve segment including the non-contact portion, and a third sleeve segment including the distal sleeve portion, and the first sleeve segment, the second sleeve segment, and the third sleeve segment are separate parts from each other.

Images