WO2023222582A1 - Ensemble dispositif de chauffage avec montage de dispositif de chauffage - Google Patents

Ensemble dispositif de chauffage avec montage de dispositif de chauffage Download PDF

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Publication number
WO2023222582A1
WO2023222582A1 PCT/EP2023/062924 EP2023062924W WO2023222582A1 WO 2023222582 A1 WO2023222582 A1 WO 2023222582A1 EP 2023062924 W EP2023062924 W EP 2023062924W WO 2023222582 A1 WO2023222582 A1 WO 2023222582A1
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WO
WIPO (PCT)
Prior art keywords
heater
proximal
heating chamber
distal
aerosol
Prior art date
Application number
PCT/EP2023/062924
Other languages
English (en)
Inventor
Larry Sacha Baudet
Original Assignee
Philip Morris Products S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philip Morris Products S.A. filed Critical Philip Morris Products S.A.
Publication of WO2023222582A1 publication Critical patent/WO2023222582A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/20—Devices using solid inhalable precursors

Definitions

  • the present invention relates to a heater assembly for an aerosol-generating device.
  • the present invention further relates to an aerosol-generating device.
  • the present invention further relates to an aerosol-generating system comprising an aerosol-generating device and an aerosol-forming article.
  • Aerosol-generating device for generating an inhalable vapor.
  • Such devices may heat aerosol-forming substrate to a temperature at which one or more components of the aerosol-forming substrate are volatilised without burning the aerosolforming substrate.
  • Aerosol-forming substrate may be provided as part of an aerosol-generating article.
  • the aerosol-generating article may have a rod shape for insertion of the aerosolgenerating article into a cavity, such as a heating chamber, of the aerosol-generating device.
  • a heating element may be arranged in or around the heating chamber for heating the aerosolforming substrate once the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device.
  • the heating chamber might be arranged within a housing of an aerosol-generating device and form part of an airflow pathway through the aerosol-generating device. It is known to provide seals around the airflow pathway and between the heating chamber and the housing to seek to prevent aerosol from leaking out of the airflow pathway and into other parts of the aerosol-generating device, which may cause damage to the electronics of the device.
  • the seals may be placed in direct contact with the heating chamber and consequently are generally formed from a heat resistant polymer such as silicone or polysiloxane.
  • exposing such polymer seals to the heating temperatures of the heating chamber may generate undesirable by-products which may contaminate the aerosol. Furthermore, such heating temperatures may degrade the seals over time.
  • An additional problem encountered with sealing airflow pathways within aerosolgenerating devices is manufacturing tolerances. Variation in the dimensions of components due to manufacturing tolerances may result in poor engagement between components and potentially gaps through which aerosol may leak. Achieving a good sealing engagement between components typically requires strict manufacturing tolerances which may be difficult to achieve in rapid manufacturing processes such as injection moulding.
  • the device might be dropped accidentally. This might change the position of the heating chamber relative to the housing. A change in the position of the heating chamber might result in the heating chamber no longer being sealingly connected to the housing. Shockloading the heating chamber due to the aerosol-generating device being dropped may further structurally damage the mounting connection of the heating chamber in a housing of the aerosol-generating device.
  • a heater assembly for an aerosol-generating device.
  • the heater assembly may comprise a tubular heating chamber for heating an aerosol-forming substrate.
  • the tubular heating chamber may comprise a proximal flared end.
  • the heater assembly may further comprise a heater casing arranged around the heating chamber.
  • the heater casing may comprise a proximal wall.
  • the proximal wall may comprise a circular groove extending in a proximal direction from an inner surface of the proximal wall.
  • the circular groove may comprise a chamfered inner side wall.
  • the chamfered inner side wall and the proximal flared end of the tubular heating chamber may have matching shapes.
  • the proximal flared end of the tubular heating chamber may be mounted into the circular groove of the proximal wall.
  • a heater assembly for an aerosol-generating device.
  • the heater assembly comprises a tubular heating chamber for heating an aerosol-forming substrate.
  • the tubular heating chamber comprises a proximal flared end.
  • the heater assembly further comprises a heater casing arranged around the heating chamber.
  • the heater casing comprises a proximal wall.
  • the proximal wall comprises a circular groove extending in a proximal direction from an inner surface of the proximal wall.
  • the circular groove comprises a chamfered inner side wall.
  • the chamfered inner side wall and the proximal flared end of the tubular heating chamber have matching shapes.
  • the proximal flared end of the tubular heating chamber is mounted into the circular groove of the proximal wall.
  • an improved sealing may be provided.
  • a heater assembly allowing manufacturing tolerances may be provided.
  • a heater assembly allowing manufacturing tolerances while providing an improved sealing may be provided.
  • a shock resistant heater assembly By mounting the proximal flared end of the tubular heating chamber into the circular groove of the heater casing comprising a chamfered inner side wall with a matching shape, a shock resistant heater assembly may be provided. By mounting the proximal flared end of the tubular heating chamber into the circular groove of the heater casing comprising a chamfered inner side wall with a matching shape, minimal to zero contact of the heating chamber to seals may be necessary. Thereby the generation of harmful or potentially harmful constituents (HPHC) during heating may be reduced or prevented.
  • HPHC harmful or potentially harmful constituents
  • the proximal wall may be perpendicular to the longitudinal axis of the heater assembly.
  • the proximal flared end may have an increasing inner diameter in a proximal direction.
  • the thickness of the material forming the proximal flared end may be constant.
  • the proximal flared end may be funnel shaped with an increasing diameter in a proximal direction. Both an inner surface and an outer surface of the proximal flared end may be inclined with the same angle with respect to the longitudinal axis of the heater assembly.
  • the proximal flared end of the tubular heating chamber may be press-fit into the circular groove of the heater casing.
  • the proximal flared end of the tubular heating chamber may be fixed to the circular groove of the heater casing.
  • the proximal flared end of the tubular heating chamber may be attached to the circular groove of the heater casing.
  • the tubular heating chamber may be a hollow cylinder with at least one flared end, preferably a proximal flared end.
  • the tubular heating chamber may be a hollow tube with at least one flared end, preferably a proximal flared end.
  • the tubular heating chamber may have at least one enlarging conical end, preferably a proximal enlarging conical end.
  • the proximal flared end may have an inner diameter measured in a direction perpendicular to the longitudinal axis of the heater assembly.
  • the tubular heating chamber may have a central inner diameter measured at the center of the tubular heating chamber in a direction perpendicular to the longitudinal axis of the heater assembly.
  • the inner diameter of the proximal flared end may be larger than the center inner diameter of the tubular heating chamber.
  • the tubular heating chamber may comprise a distal flared end.
  • the distal flared end may have an increasing diameter in a distal direction.
  • the distal flared end may be funnel shaped with an increasing diameter in a distal direction. Both an inner surface and an outer surface of the distal flared end may be inclined in the same angle.
  • the tubular heating chamber may comprise a proximal flared end and a distal flared end.
  • the tubular heating chamber may be flared at both ends.
  • the distal flared end and the proximal flared end of the tubular heating chamber may have the same inner diameters.
  • the distal flared end may be equivalent to the proximal flared end.
  • the distal flared end may have the same shape as the proximal flared end.
  • the tubular heating chamber bay be a hollow cylinder with flared ends.
  • the tubular heating chamber may be a hollow cylinder with enlarging conical ends.
  • the heater assembly may further comprise a heater mounting.
  • the heater casing may comprise the heater mounting.
  • the heater mounting may be attached to the heater casing.
  • the heater casing may coaxially surround the heater mounting.
  • the heater mounting may be configured to receive one end of the tubular heating chamber.
  • a flared end of the tubular heating chamber may be mounted into the heater mounting.
  • the distal flared end of the tubular heating chamber may be mounted into the heater mounting.
  • the distal flared end of the tubular heating chamber may be fixed to the heater mounting.
  • the distal flared end of the tubular heating chamber may be attached to the heater mounting.
  • the heater mounting may be arranged upstream of the tubular heating chamber.
  • the heater mounting may be tubular.
  • the heater casing, the tubular heating chamber and the heater mounting may confine an airflow pathway through the heater assembly.
  • the heater casing, the tubular heating chamber and the heater mounting may surround an airflow pathway through the heater assembly.
  • the airflow pathway may be confined by an airflow channel.
  • the airflow channel may be formed by inner walls of the heater casing, the tubular heating chamber and the heater mounting.
  • the airflow channel may run along the longitudinal axis of the heater assembly.
  • the airflow channel may be a straight airflow channel.
  • the heater mounting may comprise at a proximal end an additional circular groove extending in a distal direction from an inner proximal surface of the heater mounting.
  • the inner proximal surface of the heater mounting may be perpendicular to the longitudinal axis of the heater assembly.
  • the circular groove of the heater mounting may comprise a chamfered inner side wall.
  • the chamfered inner side wall of the heater mounting may be flared in a distal direction.
  • the chamfered inner side wall of the heater mounting and the distal flared end of the tubular heating chamber may have matching shapes.
  • the distal flared end of the tubular heating chamber may be mounted into the circular groove of the heater mounting.
  • Both the circular grooves of the heater casing and the heater mounting may comprise a chamfered inner side wall.
  • the tubular heating chamber may comprise the proximal and the distal flared ends which both may have matching shapes with the chamfered inner side walls of the heater casing and the heater mounting.
  • a heater assembly for an aerosol-generating device.
  • the heater assembly comprises a tubular heating chamber for heating an aerosol-forming substrate.
  • the tubular heating chamber comprises a proximal flared end and a distal flared end.
  • the heater assembly further comprises a heater casing arranged around the heating chamber.
  • the heater casing comprises a proximal wall.
  • the proximal wall comprises a circular groove extending in a proximal direction from an inner surface of the proximal wall.
  • the circular groove comprises a chamfered inner side wall.
  • the chamfered inner side wall and the proximal flared end of the tubular heating chamber have matching shapes
  • the proximal flared end of the tubular heating chamber is mounted into the circular groove of the proximal wall.
  • the heater assembly further comprises a heater mounting.
  • the heater mounting comprises at a proximal end an additional circular groove extending in a distal direction from an inner proximal surface of the heater mounting.
  • the circular groove of the heater mounting comprises a chamfered inner side wall.
  • the chamfered inner side wall of the heater mounting and the distal flared end of the tubular heating chamber have matching shapes.
  • the distal flared end of the tubular heating chamber is mounted into the circular groove of the heater mounting.
  • the chamfered inner side wall may comprise at least one rib, preferably three ribs.
  • the chamfered inner side wall may comprise two, three, four, five or six ribs.
  • the chamfered inner side wall of the circular groove of the heater casing may comprise ribs, preferably, two, three, four, five or six ribs.
  • the chamfered inner side wall of the circular groove of the heater mounting may comprise ribs, preferably, two, three, four, five or six ribs, more preferably three ribs. Both the chamfered inner side walls of the heater casing and the heater mounting may respectively comprise ribs, preferably three ribs.
  • the at least one chamfered inner side wall may comprise at least one protrusion, preferably three protrusions.
  • the chamfered inner side wall of the heater casing may be flared in a proximal direction.
  • the chamfered inner side wall of the heater mounting may be flared in a distal direction.
  • the at least one chamfered inner side wall may be flared towards the bottom of the circular groove.
  • the cross section of the at least one circular groove may be a right trapezoid.
  • the chamfered inner side wall of the heater casing and the proximal flared end of the tubular heating chamber may be parallel.
  • the chamfered inner side wall of the heater mounting and the distal flared end may be parallel.
  • the chamfered inner side walls and the flared ends may all be parallel.
  • the chamfered inner side wall of the heater casing and the heater mounting, and the proximal and distal flared ends of the tubular heating chamber may have a chamfer angle.
  • the chamfer angle may be measured between the longitudinal axis of the heater assembly and the at least one chamfered inner side wall or the chamfer of the at least one flared end.
  • the chamfered inner side wall of the heater casing may have approximately the same chamfer angle as the proximal flared end of the tubular heating chamber.
  • the chamfered inner side wall of the heater mounting may have approximately the same chamfer angle as the distal flared end of the tubular heating chamber.
  • the chamfer angles of the at least one chamfered inner side wall and the at least one flared end may all approximately be the same.
  • the chamfer angles of the chamfered inner side walls and the flared ends may have approximately the same absolute value.
  • the proximal flared end of the tubular heating chamber and the chamfered inner side wall of the heater casing may have a chamfer angle of between 20° and 45°, preferably of between 25° and 40°, more preferably of about 30°.
  • the distal flared end of the tubular heating chamber and the chamfered inner side wall of the heater mounting may have a chamfer angle of between 20° and 45°, preferably of between 25° and 40°, more preferably of about 30°.
  • the flared ends of the tubular heating chamber and the chamfered inner side walls of the heater casing and the heater mounting may have a chamfer angle of between 20° and 45°, preferably of between 25° and 40°, more preferably of about 30°.
  • the proximal flared end, the distal flared end and the chamfered inner side walls of the heater casing and the heater mounting may have a length measured along the chamfer.
  • the length of the proximal flared end of the tubular heating chamber and of the chamfered inner side wall of the heater casing may be between 0.5 and 5 millimeters, preferably between 0.5 and 3 millimeters, more preferably between 0.5 and 2 millimeters and most preferably about 1 millimetre.
  • the length of the distal flared end of the tubular heating chamber and of the chamfered inner side wall of the heater mounting may be between 0.5 and 5 millimeters, preferably between 0.5 and 3 millimeters, more preferably between 0.5 and 2 millimeters and most preferably about 1 millimeter.
  • the proximal flared end, the distal flared end and the chamfered inner side walls of the heater casing and the heater mounting may have an axial length measured in a direction along the longitudinal axis of the heater assembly.
  • the axial length may be at least 0.8 millimeter.
  • the axial length may be 4 millimeters or less.
  • the proximal flared end, the distal flared end and the chamfered inner side walls of the heater casing and the heater mounting may have a transverse length measured in a direction perpendicular to the longitudinal axis of the heater assembly.
  • the transverse length may be at least 0.5 millimeters.
  • the transverse length may be 2.5 millimeters or less.
  • the dimensions of the flared ends and the chamfered inner side wall may provide an improved shock resistance.
  • the heater assembly may be part of an aerosol-generating device. Such a device might be accidentally dropped. By such a drop the device might be exposed to a force running along the longitudinal axis of the device and as such along the heater assembly.
  • the chamfer angle of the flared ends of the tubular heating chamber may split an impact shock initial force running along the longitudinal axis of the heater assembly into two perpendicular lesser forces. The stress created on the heater assembly by these two lesser forces, when the initial force magnitude is like the one created when dropping the device on a hard surface, may withstood by the heater assembly.
  • the chamfer angle may be between 20° and 45°, preferably of between 25° and 40°, more preferably of about 30°.
  • the heater casing may be radially spaced from the tubular heating chamber and the heater mounting to define a hollow airspace around the tubular heating chamber and the heater mounting. Thereby providing a thermally insulation of the tubular heating chamber.
  • the heater casing may have an external diameter measure in a direction perpendicular to the longitudinal axis of the heater assembly. The diameter of the heater casing may be larger than an external diameter of the tubular heating chamber measured in the same direction. A ratio of the external diameter of the heater casing to an external diameter of the tubular heating chamber may be between 2 and 3.5.
  • the heater casing may be a tubular heater casing.
  • the tubular heater casing may be coaxially arranged around the tubular heating chamber.
  • An internal diameter of the tubular heating chamber may substantially correspond, or be substantially equal, to an external diameter of an aerosol-generating article.
  • an internal diameter of the tubular heating chamber may be slightly smaller than the external diameter of an aerosol-generating article, such that the aerosol-generating article is compressed in the tubular heating chamber.
  • the external diameter of an aerosol-generating article may be about 7.4 millimeters
  • the internal diameter of the tubular heating chamber may be about 7.3 millimeters.
  • a length of the tubular heating chamber may substantially correspond, or be substantially equal, to a length of an aerosol-forming substrate provided in an aerosol-generating article.
  • the heater casing may comprise a proximal heater casing and a distal heater casing.
  • the proximal heater casing may comprise the proximal wall with the circular groove.
  • the heater casing may be a two-part heater casing.
  • the proximal heater casing may comprise an air outlet.
  • the air outlet may be an opening for receiving an aerosol-generating article. Aerosol may exit the opening via an aerosol-generating article received in the tubular heating chamber.
  • the distal heater casing may comprise an air inlet.
  • the tubular heating chamber may be in fluid communication with the air inlet.
  • the tubular heating chamber may be in fluid communication with the air outlet.
  • the tubular heating chamber may be in fluid communication with both the air inlet and air outlet to define an airflow pathway through the heater assembly.
  • the proximal heater casing may have an airflow channel.
  • the airflow channel of the proximal heater casing may be in fluid communication with the air inlet.
  • the distal heater casing may have an airflow channel.
  • the airflow channel of the distal heater casing may be in fluid communication with the aerosol outlet.
  • the tubular heating chamber may have an airflow channel.
  • the airflow channel of the tubular heating chamber may pass through the length of the tubular heating chamber.
  • the heater mounting may have an airflow channel.
  • the airflow channel of the heater mounting may pass through a thickness or length of the heater mounting.
  • the airflow channels of each of the proximal heating casing, distal heater casing, tubular heating chamber and heater mounting may be in fluid communication with each other to define the airflow pathway through the heater assembly.
  • the proximal heater casing and the distal heater casing may be attached to each other.
  • the proximal and distal heater casings may be attached to each other by a fastener.
  • the proximal and distal heater casings may be attached to each other by a plurality of fasteners.
  • the plurality of fasteners may be symmetrically spaced around the proximal and distal heater casings.
  • the fastener or plurality of fasteners may comprise a threaded fastener such as a screw.
  • the fastener or plurality of fasteners may comprise a snap-fit fastener.
  • the proximal heater casing and the distal heater casing may have a length measured in a direction along the longitudinal axis of the heater assembly.
  • the length of the proximal heater casing may smaller than the length of the distal heater casing.
  • the proximal heater casing may comprise a proximal portion and a distal portion.
  • the proximal portion and the distal portion may have an outer diameter measured in a direction perpendicular to the longitudinal axis of the heater assembly.
  • the outer diameter of the proximal portion may be smaller than the outer diameter of the distal portion.
  • the distal portion may comprise the proximal wall comprising the circular groove.
  • the circular groove may have an outer diameter measured in a direction perpendicular to the longitudinal axis of the heater assembly.
  • the outer diameter of the circular groove may be approximately the same as the outer diameter of the proximal portion of the proximal heater casing.
  • the distal heater casing may comprise a proximal portion and a distal portion.
  • the proximal portion and the distal portion may have an outer diameter measured in a direction perpendicular to the longitudinal axis of the heater assembly.
  • the outer diameter of the proximal portion may be larger than the outer diameter of the distal portion.
  • the airflow channel may be confined by the proximal portion of the proximal heater casing, the tubular heater tube, the heater mounting and the distal portion of the distal heater casing.
  • the heater mounting may comprise a proximal portion and a distal portion.
  • the proximal portion may have a larger diameter measured in a direction perpendicular to the longitudinal axis of the heater assembly than the distal portion
  • the proximal portion may comprise the circular groove.
  • the distal heater casing may comprise the heater mounting.
  • the distal heater casing may be part of the distal heater casing.
  • the heater mounting may be mounted into the distal heater casing.
  • the heater mounting may be connected to the distal heater casing via snap fit or screwing engagement.
  • the heater mounting may be mounted into a distal opening of the distal heater casing.
  • the proximal part of the distal heater casing may comprise a distal wall.
  • the distal wall may comprise the distal opening.
  • the distal portion of the heater mounting may be at least partially inserted into the distal opening of the distal heater casing.
  • the tubular heating chamber may be arranged between the proximal heater casing and the heater mounting.
  • the tubular heating chamber may be sandwiched between the proximal heater casing and the heater mounting.
  • the tubular heating chamber may be press-fit into the proximal heater casing and the heater mounting.
  • the proximal flared end of the tubular heating chamber may be mounted into the proximal wall of proximal heater casing and the distal flared end of the tubular heating chamber may be mounted into the proximal portion of the heater mounting.
  • the matching shapes of the chamfered inner side wall and the flared ends may provide a sealingly connection when the tubular heating chamber is sandwiched between or press-fitted into the proximal heater casing and the heater mounting.
  • a seal may be arranged between the heater mounting and an internal surface of the distal heater casing.
  • a seal may be mounted between the heater mounting and an internal surface of the distal heater casing. The seal may be arranged between a distal end of the proximal portion of the heater mounting and the distal wall of the proximal portion of the distal heater casing.
  • the seal may be resilient.
  • the seal may be formed from any suitable material.
  • the seal may comprise a resilient material.
  • the seal may comprise a polymer.
  • the seal may comprise an elastomeric polymer.
  • the seal may comprise, or be formed from, any suitable polymer including, but not limited to, ethylene propylene diene monomer (EPDM) rubber or silicone.
  • EPDM ethylene propylene diene monomer
  • the seal may be an O-ring.
  • the O-ring may have a diameter measured in a direction perpendicular to the longitudinal axis of the heater assembly. The diameter of the O-ring may be approximately the same or smaller than an outer diameter of the proximal portion of the heater mounting measured in the same direction.
  • the seal may be compressed when the heater assembly is assembled.
  • the seal may be compressed between the heater mounting and the distal heater casing when the heater assembly is assembled.
  • the seal may have a Shore hardness between 30A and 90A, preferably a Shore hardness between 50A and 80A and more preferably a Shore hardness of about 70A. These values of Shore hardness have been found to be soft enough to absorb manufacturing tolerances but still hard enough to provide sufficient force to the heater assembly for airflow pathway sealing and heater assembly integrity.
  • the Shore hardness may be determined by technical standard ISO868 Type A.
  • the seal may comprise any suitable shape.
  • the seal may comprise a shape which conforms to a shape of the heater mounting.
  • the seal may comprise a shape which conforms to a shape of one of the proximal and distal heater casings.
  • the seal may comprise an O-ring.
  • the seal may have any suitable cross-sectional shape in a longitudinal plane of the heater assembly including, but not limited to, a circular, cross-sectional shape, or a cross-sectional shape with two opposing flat surfaces such as a square or rectangular cross-sectional shape.
  • the seal may have an uncompressed thickness or diameter of between 0.5 millimetres and 2 millimetres.
  • the seal may have an uncompressed thickness or diameter of about 1 millimetre. These uncompressed thicknesses have been found to be particularly effective for absorbing manufacturing tolerances and for providing airflow pathway sealing and heater assembly integrity.
  • An advantage of mounting the seal between the heater casing and the heater mounting rather than between the heater casing and the tubular heating chamber is that it avoids contact between the seal and the tubular heating chamber. Furthermore, the seal is advantageously arranged such that it is spaced apart or distanced from the tubular heating chamber. This distance between the tubular heating chamber and the seal means that the seal is maintained at a lower temperature than the tubular heating chamber and does not overheat. Since the seal is not subjected to high thermal stresses an improved sealing of the airflow pathway through the heater assembly may be achieved.
  • the heater assembly of the present disclosure is also less susceptible to manufacturing tolerances because the seal is able to absorb at least a portion of the manufacturing tolerances to achieve improved sealing. Additionally, the matching shapes of the chamfered inner side wall and the flared ends may provide a correct alignment and holding of the heater casing, the tubular heating chamber and the heater mounting.
  • the proximal heater casing, the distal heater casing, the tubular heating chamber, the heater mounting and the seal may enclose an air space.
  • the proximal heater casing, the distal heater casing, the tubular heating chamber, the heater mounting and the seal may enclose an air tight space.
  • the air tight space may be hollow. Alternatively or additionally, the air tight space may comprise an insulating material.
  • the chamfered inner side wall comprises the at least one rib, preferably three ribs
  • the proximal heater casing, the distal heater casing, the tubular heating chamber, the heater mounting and the seal may enclose the air space.
  • the at least one chamfered inner side wall of the heater casing and the heater mounting respectively comprises the at least one rib, preferably three ribs
  • the proximal heater casing, the distal heater casing, the tubular heating chamber, the heater mounting and the seal may enclose the air space.
  • the air space may improve the overall heating efficiency of the heater assembly.
  • the ribs in combination with the O-ring may provide an air tight sealing.
  • the ribs in combination with the O-ring may limit the possibility of air leakage out of the air space.
  • the ribs in combination with the O-ring may limit the possibility of leakage from the airflow pathway into the heater casing.
  • the ribs and the O-ring may absorb manufacturing tolerances. Thereby the sealing may be less to zero impacted by manufacturing tolerances.
  • a heater assembly comprising a two-part heater casing, a tubular heating chamber with flared ends mounted into the proximal heater casing and a heater mounting, which is arranged on a seal, provides a less complex assembly while allowing manufacturing tolerances and providing a good sealing.
  • the tubular heating chamber may comprise a metal.
  • the tubular heating chamber may be made of metal.
  • the tubular heating chamber may be made of stainless steel.
  • One or more of a wall of the heater casing and the heater mounting may comprise a plastic material.
  • One or more of a wall of the heater casing and the heater mounting may be made of a plastic material.
  • the plastic material may be a polyaryletherketone (PAEK), a polyether ether ketone (PEEK), or a polyphenylene sulfone (PPSLI), more preferably a polyphenylene sulfone (PPSLI).
  • the heater assembly comprises the tubular heating chamber made of a metal, the heater casing and the heater mounting made of a plastic material and the seal between the heater mounting and the heater casing.
  • the tubular heating chamber comprises the proximal and distal flared ends being mounted into the chamfered inner side walls of the heater casing and the heater mounting.
  • the tubular heating chamber may have an elongate shape.
  • the length measured in a direction along the longitudinal axis of the heater assembly may be larger than the diameter of the tubular heating chamber measured in the same direction.
  • the heating chamber may be an elongate hollow tube.
  • the heater assembly may further comprise a heating element.
  • the heating element may be arranged at least partly around the tubular heating chamber.
  • the heating element may comprise one or more electrically conductive tracks on an electrically insulating substrate.
  • the heating element may be flexible.
  • the heating element may be wrapped at least partly around the tubular heating chamber.
  • the heating element may be arranged between the heater casing and the tubular heating chamber.
  • the distal heater casing may comprise the circular groove with the chamfered inner side wall and the distal flared end of the tubular heating chamber may be mounted into this circular groove and the proximal flared end may be mounted into the heater mounting being mounted into the proximal heater casing.
  • the invention further relates to an aerosol-generating device comprising the heater assembly as described herein.
  • the aerosol-generating device comprises a power supply configured to supply power to the heating element.
  • the power supply preferably comprises a power source.
  • the power source is a battery, such as a lithium ion battery.
  • the power source may be another form of charge storage device such as a capacitor.
  • the power source may require recharging.
  • the power source may have sufficient capacity to allow for the continuous generation of aerosol for a period of around six minutes or for a period that is a multiple of six minutes.
  • the power source may have sufficient capacity to allow for a predetermined number of puffs or discrete activations of the heater assembly.
  • the power supply may comprise control electronics.
  • the control electronics may comprise a microcontroller.
  • the microcontroller is preferably a programmable microcontroller.
  • the electric circuitry may comprise further electronic components.
  • the electric circuitry may be configured to regulate a supply of power to the heater assembly. Power may be supplied to the heater assembly continuously following activation of the system or may be supplied intermittently, such as on a puff-by-puff basis. The power may be supplied to the heater assembly in the form of pulses of electrical current.
  • the invention further relates to an aerosol-generating system comprising the aerosolgenerating device an aerosol-generating article.
  • the aerosol-generating article may comprise a substrate portion comprising an aerosol-forming substrate.
  • the aerosol-generating article may be configured to be at least partly inserted into the tubular heating chamber.
  • the aerosol-generating article may comprise a substrate portion comprising the aerosol-forming substrate.
  • a length of the substrate portion may be shorter than or equal to a length of the heating element.
  • a length of the substrate portion may be greater than a length of the heating element.
  • a length of the substrate portion may be greater than a length of the heating element but shorter than a length of the heating chamber.
  • a length of the substrate portion may be equal to or greater than a length of the heating chamber.
  • the aerosolgenerating article may comprise the substrate portion and a further mouthpiece portion.
  • the mouthpiece portion may be positioned at a proximal end of the aerosol-generating article.
  • the mouthpiece portion may comprise a filter.
  • Aerosol-generating devices comprise a proximal end through which, in use, an aerosol exits the device.
  • the proximal end of the aerosol-generating device may also be referred to as the mouth end or the downstream end.
  • the mouth end is downstream of the distal end.
  • the distal end of the aerosol-generating article may also be referred to as the upstream end.
  • Components, or portions of components, of the aerosolgenerating device may be described as being upstream or downstream of one another based on their relative positions with respect to the airflow path of the aerosol-generating device.
  • a proximal end of the heater assembly according to the invention is configured to be arranged within an aerosol-generating device in a direction towards the mouth end or downstream end of the device.
  • a distal end of the heater assembly according to the invention is configured to be arranged within an aerosol-generating device in a direction towards the distal end or upstream end of the device.
  • a longitudinal axis of the tubular heating chamber may extend between the proximal end of the heating chamber and the distal end of the heating chamber.
  • a longitudinal axis of the tubular heating chamber may extend between the proximal end of the heater assembly and the distal end of the heater assembly.
  • the heating element may comprise an electrically resistive material.
  • Suitable electrically resistive materials include but are not limited to: semiconductors such as doped ceramics, electrically "conductive" ceramics (such as, for example, molybdenum disilicide), carbon, graphite, metals, metal alloys and composite materials made of a ceramic material and a metallic material.
  • Such composite materials may comprise doped or undoped ceramics.
  • the heating element may be part of the heating chamber of the heater assembly for an aerosol-generating device.
  • the heater assembly may comprise an internal heating element or an external heating element, or both internal and external heating elements, where "internal” and “external” refer to the aerosolforming substrate.
  • An internal heating element may take any suitable form.
  • an internal heating element may take the form of a heating blade.
  • the internal heater may take the form of a casing or substrate having different electro-conductive portions, or an electrically resistive metallic tube.
  • the internal heating element may be one or more heating needles or rods that run through the center of the aerosol-forming substrate.
  • the internal heating element may be deposited in or on a rigid carrier material.
  • the electrically resistive heating element may be formed using a metal having a defined relationship between temperature and resistivity.
  • the metal may be formed as a track on a suitable insulating material, such as ceramic material, and then sandwiched in another insulating material, such as a glass. Heaters formed in this manner may be used to both heat and monitor the temperature of the heating elements during operation.
  • An external heating element may take any suitable form.
  • an external heating element may take the form of one or more flexible heating foils on a dielectric substrate, such as polyimide.
  • the flexible heating foils can be shaped to conform to the perimeter of the substrate receiving cavity.
  • an external heating element may take the form of a metallic grid or grids, a flexible printed circuit board, a molded interconnect device (MID), ceramic heater, flexible carbon fibre heater or may be formed using a coating technique, such as plasma vapour deposition, on a suitable shaped substrate.
  • An external heating element may also be formed using a metal having a defined relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track between two layers of suitable insulating materials. An external heating element formed in this manner may be used to both heat and monitor the temperature of the external heating element during operation.
  • the heating element advantageously heats the aerosol-forming substrate by means of heat conduction.
  • the heating element may be at least partially in contact with the substrate, or the carrier on which the substrate is deposited.
  • the heat from either an internal or external heating element may be conducted to the substrate by means of a heat conductive element.
  • the aerosol-forming substrate may be completely contained within the aerosol-generating device. In that case, a user may puff on a mouthpiece of the aerosolgenerating device.
  • a smoking article containing the aerosolforming substrate may be partially contained within the aerosol-generating device. In that case, the user may puff directly on the smoking article.
  • the heating element may be configured as an induction heating element.
  • the induction heating element may comprise an induction coil and a susceptor.
  • a susceptor is a material that is capable of generating heat, when penetrated by an alternating magnetic field.
  • the susceptor may be electrically conductive or magnetic or both electrically conductive and magnetic.
  • An alternating magnetic field generated by one or several induction coils heat the susceptor, which then transfers the heat to the aerosol-forming substrate, such that an aerosol is formed.
  • the heat transfer may be mainly by conduction of heat. Such a transfer of heat is best, if the susceptor is in close thermal contact with the aerosol-forming substrate.
  • the induction heating element may be configured as an internal heating element as described herein or as an external heater as described herein. If the induction heating element is configured as an internal heating element, the susceptor element is preferably configured as a pin or blade for penetrating the aerosol-generating article. If the induction heating element is configured as an external heating element, the susceptor element is preferably configured as a cylindrical susceptor at least partly surrounding the cavity or forming the sidewall of the cavity.
  • aerosol-forming substrate refers to a substrate capable of releasing volatile compounds that can form an aerosol.
  • the volatile compounds may be released by heating or combusting the aerosol-forming substrate.
  • volatile compounds may be released by a chemical reaction or by a mechanical stimulus, such as ultrasound.
  • the aerosol-forming substrate may be solid or liquid or may comprise both solid and liquid components.
  • An aerosol-forming substrate may be part of an aerosol-generating article.
  • the aerosol-forming substrate may comprise nicotine.
  • the nicotine-containing aerosolforming substrate may be a nicotine salt matrix.
  • the aerosol-forming substrate may comprise plant-based material.
  • the aerosolforming substrate may comprise tobacco.
  • the aerosol-forming substrate may comprise a tobacco-containing material including volatile tobacco flavour compounds which are released from the aerosol-forming substrate upon heating.
  • the aerosol-forming substrate may comprise a non-tobacco material.
  • the aerosol-forming substrate may comprise homogenised plant-based material.
  • the aerosol-forming substrate may comprise homogenised tobacco material. Homogenised tobacco material may be formed by agglomerating particulate tobacco.
  • the aerosol-forming substrate may comprise at least one aerosol-former.
  • An aerosolformer is any suitable known compound or mixture of compounds that, in use, facilitates formation of a dense and stable aerosol and that is substantially resistant to thermal degradation at the temperature of operation of the device.
  • Suitable aerosol-formers are well known in the art and include, but are not limited to: polyhydric alcohols, such as triethylene glycol, 1 ,3-butanediol and glycerine; esters of polyhydric alcohols, such as glycerol mono-, di- or triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate.
  • Preferred aerosol formers are polyhydric alcohols or mixtures thereof, such as triethylene glycol, 1 ,3-butanediol.
  • the aerosol former is glycerine.
  • the homogenised tobacco material may have an aerosolformer content of equal to or greater than 5 percent by weight on a dry weight basis, and preferably from 5 percent to 30 percent by weight on a dry weight basis.
  • the aerosol-forming substrate may comprise other additives and ingredients, such as flavourants.
  • aerosol-generating article refers to an article comprising an aerosol-forming substrate that is capable of releasing volatile compounds that can form an aerosol.
  • An aerosol-generating article may be disposable.
  • the term “aerosol-generating device” refers to a device that interacts with an aerosol-forming substrate to generate an aerosol.
  • An aerosol-generating device may interact with one or both of an aerosol-generating article comprising an aerosol-forming substrate, and a cartridge comprising an aerosol-forming substrate.
  • the aerosol-generating device may heat the aerosol-forming substrate to facilitate release of volatile compounds from the substrate.
  • An electrically operated aerosol-generating device may comprise an atomiser, such as an electric heater, to heat the aerosol-forming substrate to form an aerosol.
  • the term "aerosol-generating system” refers to the combination of an aerosol-generating device with an aerosol-forming substrate.
  • the aerosol-generating system refers to the combination of the aerosol-generating device with the aerosol-generating article.
  • the aerosol-forming substrate and the aerosol-generating device cooperate to generate an aerosol.
  • Example ex1 A heater assembly for an aerosol-generating device, comprising a tubular heating chamber for heating an aerosol-forming substrate, wherein the tubular heating chamber comprises a proximal flared end; and a heater casing arranged around the heating chamber, wherein the heater casing comprises a proximal wall, wherein the proximal wall comprises a circular groove extending in a proximal direction from an inner surface of the proximal wall, wherein the circular groove comprises a chamfered inner side wall, wherein the chamfered inner side wall and the proximal flared end of the tubular heating chamber have matching shapes, and wherein the proximal flared end of the tubular heating chamber is mounted into the circular groove of the proximal wall.
  • Example ex2 The heater assembly according to example ex1 , wherein the chamfered inner side wall of the heater casing is flared in a proximal direction.
  • Example ex3 The heater assembly according to any of the proceeding examples, wherein the tubular heating chamber comprises a distal flared end.
  • Example ex4 The heater assembly according to example ex3, further comprising a heater mounting, wherein the distal flared end of the tubular heating chamber is mounted into the heater mounting.
  • Example ex5 The heater assembly according to example ex4, wherein the heater casing, the tubular heating chamber and the heater mounting confine an airflow pathway through the heater assembly.
  • Example ex6 The heater assembly according to any of examples ex4 or ex5, wherein the heater mounting comprises at a proximal end an additional circular groove extending in a distal direction from an inner proximal surface of the heater mounting, wherein the circular groove comprises a chamfered inner side wall, wherein the chamfered inner side wall is flared in a distal direction, wherein the chamfered inner side wall and the distal flared end of the tubular heating chamber have matching shapes, and wherein the distal flared end of the tubular heating chamber is mounted into the circular groove of the heater mounting.
  • Example ex7 The heater assembly according to any of the proceeding examples, wherein one or both of the chamfered inner side wall of the proximal wall and the chamfered inner side wall of the heater mounting comprises at least one rib, preferably three ribs.
  • Example ex8 The heater assembly according to any of the proceeding examples, wherein the chamfered inner side wall of the heater casing has the same chamfer angle as the proximal flared end of the tubular heating chamber.
  • Example ex9 The heater assembly according to example ex8, wherein the proximal flared end of the tubular heating chamber and the chamfered inner side wall of the heater casing, have a chamfer angle of between 20° and 45°, preferably of between 25° and 40°, more preferably of about 30°.
  • Example ex10 The heater assembly according to any of the proceeding examples, wherein the length of the proximal flared end of the tubular heating chamber and of the chamfered inner side wall of the heater casing is between 0.5 and 5 millimetres, preferably between 0.5 and 3 millimetres, more preferably between 0.5 and 2 millimetres and most preferably about 1 millimeter.
  • Example ex11 The heater assembly according to any of the previous examples, wherein the heater casing is a tubular heater casing, preferably wherein the tubular heater casing is coaxially arranged around the tubular heating chamber.
  • Example ex12 The heater assembly according to any of the proceeding examples, wherein the heater casing comprises a proximal heater casing and a distal heater casing, and wherein the proximal heater casing comprises the proximal wall with the circular groove.
  • Example ex13 The heater assembly according to example ex12, wherein the proximal heater casing comprises an air outlet and the distal heater casing comprises an air inlet.
  • Example ex14 The heater assembly according to any of examples ex12 or ex13, further comprising the heater mounting of example ex4, wherein the distal heater casing comprises the heater mounting or wherein the heater mounting is mounted into a distal opening of the distal heater casing.
  • Example ex15 The heater assembly according to example ex14, wherein the tubular heating chamber is sandwiched between or press-fit into the proximal heater casing and the heater mounting.
  • Example ex16 The heater assembly according to any of example ex14 or ex15, wherein the heater mounting is mounted into a distal opening of the distal heater casing, and wherein a seal is arranged between the heater mounting and an internal surface of the distal heater casing.
  • Example ex17 The heater assembly according to example ex16, wherein one or both of the chamfered inner side wall of the proximal wall and the chamfered inner side wall of the heater mounting comprises the at least one rib, preferably three ribs, and wherein the proximal heater casing, the distal heater casing, the tubular heating chamber, the heater mounting and the seal enclose an air space, preferably the air space is an air tight space, more preferably the air tight space is hollow.
  • Example ex18 The heater assembly according to any of the previous examples, wherein the tubular heating chamber is made of metal, preferably is made of stainless steel.
  • Example ex19 The heater assembly according to any of examples ex4 to ex18, wherein one or more of a wall of the heater casing and the heater mounting is made of a plastic material, preferably a polyaryletherketone (PAEK), a polyether ether ketone (PEEK), or a polyphenylene sulfone (PPSLI), more preferably a polyphenylene sulfone (PPSLI).
  • a plastic material preferably a polyaryletherketone (PAEK), a polyether ether ketone (PEEK), or a polyphenylene sulfone (PPSLI), more preferably a polyphenylene sulfone (PPSLI).
  • PEEK polyaryletherketone
  • PEEK polyether ether ketone
  • PPSLI polyphenylene sulfone
  • Example ex20 The heater assembly according to any of the previous examples, wherein the tubular heating chamber has an elongate shape, preferably wherein the tubular heating chamber is an elongate hollow tube.
  • Example ex21 The heater assembly according to any of the proceeding examples, further comprising a heating element, preferably wherein the heating element is arranged at least partly around the tubular heating chamber.
  • Example ex22 The heater assembly according to example ex21 , wherein the heating element comprises one or more electrically conductive tracks on an electrically insulating substrate.
  • Example ex23 The heater assembly according to any of examples ex21 or ex22, wherein the heating element is flexible and is wrapped at least partly around the tubular heating chamber.
  • Example ex24 An aerosol-generating device comprising the heater assembly according to any of the preceding examples.
  • Example ex25 An aerosol-generating system comprising the aerosolgenerating device of example ex24 and an aerosol-generating article comprising a substrate portion comprising an aerosol-forming substrate, wherein the aerosol-generating article is configured to be at least partly inserted into the tubular heating chamber.
  • Fig. 1 shows an embodiment of a heater assembly for an aerosol-generating device
  • Figs. 2A, 2B, 2C and 2D show a flared end of the tubular heating chamber with a chamfered inner side wall, respectively;
  • Fig. 3 shows an embodiment of an aerosol-generating device comprising the heater assembly.
  • Fig. 1 shows a cross section of a heater assembly 10.
  • the heater assembly 10 comprises a tubular heating chamber 12 and a heater casing 14 arranged around the tubular heating chamber 12.
  • the heater casing 14 comprises a proximal heater casing 16 and a distal heater casing 18.
  • the proximal heater casing 16 comprises a proximal portion 20 and a distal portion 22.
  • the proximal portion 20 has a smaller diameter than the distal portion 22. Both the proximal and the distal portions 20 and 22 are tubular.
  • the proximal portion 20 confines a proximal airflow channel.
  • the proximal portion further comprises an air outlet 24.
  • the distal heater casing 18 comprises a proximal portion 26 and a distal portion 28.
  • the proximal portion 26 has a larger diameter than the distal portion 28. Both the proximal and the distal portions 26 and 28 are tubular. The distal portion 28 confines a distal airflow channel. The distal portion 28 comprises a distal air inlet 30.
  • the heater assembly 10 further comprises a heater mounting 32.
  • the heater mounting 32 comprises a proximal portion 34 and a distal portion 36.
  • the proximal portion 34 has a larger diameter than the distal portion 36. Both the proximal and the distal portions 34 and 36 are tubular.
  • the proximal and distal heater casing 16 and 18 and the heater mounting 32 are made of a plastic material, preferably they are made from polyether ether ketone (PEEK) due to its advantageous mechanical and heat-insulating properties.
  • PEEK polyether ether ketone
  • the proximal portion 20, the tubular heating chamber 12, the heater mounting 32 and the distal portion 28 confine an airflow channel comprising an airflow pathway 38.
  • the proximal heater casing 16, the tubular heating chamber 12, the heater mounting 32 and the distal heater casing 18 are coaxially arranged around the longitudinal axis 40 of the heater assembly 10.
  • the proximal heater casing 16, the tubular heating chamber 12, the heater mounting 32 and the distal heater casing 18 enclose a hollow air space.
  • the hollow air space provides a thermal insulation of the tubular heating chamber 12. Thereby heat loss from the tubular heating chamber 12 and heat transfer to an exterior of the heater assembly are reduced.
  • the wall of the tubular heating chamber 12 is a metal tube, preferably the tubular heating chamber is made of stainless steel.
  • a flexible heating element 42 is wrapped around an exterior surface of the metal tube to heat the tubular heating chamber 12 which in turn heats an aerosol-forming substrate (not shown) received within an internal space of the tubular heating chamber 12.
  • the heating element 42 comprises electrically conductive heating tracks 44 on an electrically insulating flexible substrate 46.
  • the electrically insulating flexible substrate 46 comprises a heat-resistant flexible polyimide film having the electrically conductive heating tracks 44 which typically form a serpentine pattern on the film.
  • the electrically conductive heating tracks 44 which are connected to an electrical power supply (not shown) and generate heat when an electric current is passed through them.
  • proximal and distal edge portions of the flexible substrate 46 are not covered by the heating tracks 44. In other embodiments, different regions or even the whole surface of the flexible substrate 46 may be covered by the heating tracks 44.
  • the heating element 42 may be configured as an inducive heating element comprising a susceptor and inductive coils (not shown).
  • the distal portion 22 of the proximal heater casing 16 comprises a proximal wall 48.
  • the proximal wall 48 comprises a circular groove 50.
  • the circular groove 50 comprises a chamfered inner side wall 52. Thereby the circular groove 50 has a right trapezoid cross section.
  • a proximal flared end 54 of the tubular heating chamber 12 is mounted into the circular groove 50 .
  • the chamfered inner side wall 52 and the proximal flared end 54 have the same chamfer.
  • the proximal portion 26 of the distal heater casing 18 comprises a distal wall 56 comprising a distal opening 58.
  • the distal portion 36 of the heat mounting 32 is mounted into the distal opening 58.
  • a seal 60 is arranged between the proximal portion 34 of the heater mounting 32 and an internal surface of the proximal portion 26 of the distal heater casing 18.
  • the proximal part 34 of the heater mounting 32 is spaced from the internal wall of the distal heater casing 18.
  • the seal 60 is spaced from the tubular heating chamber 12.
  • the seal 60 is an O-ring made from ethylene propylene diene monomer (EPDM) rubber.
  • the seal 60 has a Shore hardness of 70A, as determined by technical standard ISO868 Type A.
  • the seal 60 has an uncompressed thickness or diameter of 1 millimetre. This thickness has also been found to be suitable for absorbing manufacturing tolerances and to exert force on the heater assembly 10 to provide for sealing of the airflow pathway 38 and integrity of the heater assembly 10.
  • the heater mounting 32 comprises a circular groove 62 comprising a chamfered inner side wall 64. Thereby the circular groove 62 has a right trapezoid cross section. Into the circular groove 62 a distal flared end 66 of the tubular heating chamber 12 is mounted.
  • the flared ends 54 and 66 of the tubular heating chamber 12 are press-fit into the circular grooves 50 and 62, respectively.
  • the flared ends 54 and 66 are not circumscribed by the heating element 42.
  • Figs. 2A and 2B show a cross section of a chamfered side wall 68 with a flared end 70.
  • the chamfered side wall 68 can be one or both of the chamfered inner side walls 52 and 64.
  • the flared end 70 can be one or both of the flared ends 54 and 66.
  • the chamfered side wall 68 and the flared end 70 have a length 72 measured along the chamfer, a transverse length 74 measured in a direction perpendicular to the longitudinal axis 40 and an axial length 76 measure along the longitudinal axis 40.
  • the axial length of the chamfered inner side walls 52 and 64 is between 0.8 millimeter and 4 millimeters and the transverse length is between 0.5 millimeter and 2.5 millimeters.
  • the axial length of the flared ends 54 and 66 is between 0.8 millimeter and 4 millimeters and the transverse length is between 0.5 millimeter and 2.5 millimeters.
  • the chamfered side wall 68 is chamfered in a chamfer angle 78.
  • the flared end 70 is chamfered in a chamfer angle 80.
  • the chamfer angles 78 and 80 are measured with respect to the longitudinal axis 40 of the heater assembly 10.
  • the chamfered side wall 68 and the flared end 70 are parallel. Thereby the chamfer angles 78 and 80 have the same absolute value.
  • the chamfer angle 78 is between 20° and 45°, preferably between 25° and 40°, more preferably about 30°.
  • the chamfer angle 80 is between 20° and 45°, preferably between 25° and 40°, more preferably about 30°.
  • Both the chamfer angles 78 and 80 are between 20° and 45°, preferably between 25° and 40°, more preferably about 30°.
  • a chamfer angle of 30° an improved shock resistance is provided as an impact shock initial force running along the longitudinal axis of the heater assembly 10 is split into two perpendicular lesser forces.
  • Fig. 2C shows how an initial force running along the longitudinal axis F is split into forces F1 (running along the chamfer) and F2 (running perpendicular to the chamfer).
  • F1 is about 87% (cos30°) of the initial force F.
  • the second force F2 is about 50% (sin30°) of the initial force F.
  • F2 pushes the chamfered inner side walls 52 and 64 toward the tubular empty core.
  • the cone structure has already decreased F2 to a sustainable force that the elastic property of the plastic part can sustain when F magnitude is in the range of drop test force.
  • Fig. 2D shows a cross section of a chamfered side wall 82.
  • the chamfered side wall 82 can be one or both of the chamfered inner side walls 52 and 64.
  • the chamfered side wall 82 comprises three ribs 84. The ribs 84 press against the surface of the flared end.
  • Fig. 3 shows a cross section of an aerosol-generating device 86.
  • the aerosolgenerating device 86 comprises the heater assembly 10 of Fig. 1.
  • the aerosol-generating device 86 further comprises a power source 88 and control electronics 90.
  • the power source 88 may be a rechargeable battery.
  • an aerosol-forming substrate (not shown) may be inserted at least partly into the tubular heating chamber 12 of the heater assembly 10.

Abstract

L'invention concerne un ensemble dispositif de chauffage (10) pour un dispositif de génération d'aérosol (86). L'ensemble dispositif de chauffage comprend une chambre de chauffage tubulaire (12) pour chauffer un substrat de formation d'aérosol. La chambre de chauffage tubulaire comprend une extrémité évasée proximale (54). L'ensemble dispositif de chauffage comprend en outre un boîtier de dispositif de chauffage (16) disposé autour de la chambre de chauffage. Le boîtier de dispositif de chauffage comprend une paroi proximale (48). La paroi proximale comprend une rainure circulaire (50) s'étendant dans une direction proximale à partir d'une surface interne de la paroi proximale. La rainure circulaire comprend une paroi latérale interne chanfreinée (52). La paroi latérale interne chanfreinée et l'extrémité évasée proximale de la chambre de chauffage tubulaire ont des formes correspondantes. L'extrémité évasée proximale de la chambre de chauffage tubulaire est montée dans la rainure circulaire de la paroi proximale. L'invention concerne également un dispositif de génération d'aérosol comprenant l'ensemble dispositif de chauffage et un système de génération d'aérosol comprenant le dispositif de génération d'aérosol et un substrat de formation d'aérosol.
PCT/EP2023/062924 2022-05-16 2023-05-15 Ensemble dispositif de chauffage avec montage de dispositif de chauffage WO2023222582A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0822760A2 (fr) * 1995-04-20 1998-02-11 Philip Morris Products Inc. Cigarette et dispositif chauffant destines a un systeme electrique servant a fumer
US20140314397A1 (en) * 2013-04-23 2014-10-23 Atmos Nation, LLC Electric Vaporizer Heating Assembly with Dual Anodized Heating Compartments
US20160073692A1 (en) * 2014-09-17 2016-03-17 Fontem Holdings 2 B.V. Device for storing and vaporizing liquid media
US20200154765A1 (en) * 2017-04-11 2020-05-21 Kt&G Corporation Aerosol generating device
US20210307390A1 (en) * 2018-10-12 2021-10-07 Jt International S.A. Aerosol Generation Device, And Heating Chamber Therefor
US20220125109A1 (en) * 2019-01-15 2022-04-28 Philip Morris Products S.A. Aerosol-generating device with movable top cover

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0822760A2 (fr) * 1995-04-20 1998-02-11 Philip Morris Products Inc. Cigarette et dispositif chauffant destines a un systeme electrique servant a fumer
US20140314397A1 (en) * 2013-04-23 2014-10-23 Atmos Nation, LLC Electric Vaporizer Heating Assembly with Dual Anodized Heating Compartments
US20160073692A1 (en) * 2014-09-17 2016-03-17 Fontem Holdings 2 B.V. Device for storing and vaporizing liquid media
US20200154765A1 (en) * 2017-04-11 2020-05-21 Kt&G Corporation Aerosol generating device
US20210307390A1 (en) * 2018-10-12 2021-10-07 Jt International S.A. Aerosol Generation Device, And Heating Chamber Therefor
US20220125109A1 (en) * 2019-01-15 2022-04-28 Philip Morris Products S.A. Aerosol-generating device with movable top cover

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