Aerosol generating device with piercing assembly
An electrically heated aerosol-generating device includes a main housing having a cavity, a closure body engageable with the main housing to enclose a cartridge in the cavity, and a heater assembly. The heater assembly includes an elongate piercing assembly configured to extend into the open-ended passage of the cartridge and one or more electric heaters. The piercing assembly has a first hollow shaft portion connected to the main housing and a second hollow shaft portion connected to the closure body. The first and second hollow shaft portions have first and second piercing surfaces configured to breakthrough first and second frangible seals when the cartridge is enclosed in the cavity.
1. An electrically heated aerosol-generating device for use with a consumable cartridge comprising a storage portion containing an aerosol-forming substrate, the storage portion having a fluid permeable internal surface surrounding an open ended passage extending through the cartridge, the device comprising:
a main housing having a cavity for receiving a cartridge;
a closure body engageable with the main housing to enclose the cartridge in the cavity; and
a heater assembly for heating the cartridge, the heater assembly including,
an elongate piercing assembly configured to extend into the open ended passage of the cartridge and defining an internal airflow passage forming part of an airflow pathway through the device, the elongate piercing assembly including,
a first hollow shaft portion connected to the main housing, the first hollow shaft portion having a first piercing surface at a distal end thereof, the first piercing surface configured to break through a first frangible seal across a first end of the open ended passage when the cartridge is inserted into the cavity, and
a second hollow shaft portion connected to the closure body, the second hollow shaft portion having a second piercing surface at a distal end thereof, the second piercing surface configured to break through a second frangible seal across a second end of the open ended passage when the closure body is engaged with the main housing, the first and second hollow shaft portions extending along a same longitudinal axis when the closure body is engaged with the main housing, and the first and second hollow shaft portions being sized to meet at a junction such that the elongate piercing assembly extends along an entire length of the cavity when the closure body is engaged with the main housing; and
at least one electric heater fixed to the elongate piercing assembly, the at least one electric heater having at least one heating element for heating the aerosol forming substrate when the cartridge is enclosed in the cavity.
2. The electrically heated aerosol-generating device according to claim 1 , wherein the distal end of the first hollow shaft portion and the distal end of the second hollow shaft portion are each co-operatively shaped such that a seal is formed around the junction.
3. The electrically heated aerosol-generating device according to claim 2 , wherein the distal end of one of the first hollow shaft portion and the second hollow shaft portion has an inwardly tapering outer surface and the distal end of the other one of the first and second hollow shaft portions has an outwardly tapering inner surface, the inner and outer surfaces being shaped such that the inwardly tapering outer surface fits within the outwardly tapering inner surface to form the seal when the closure body is engaged with the main housing.
4. The electrically heated aerosol-generating device according to claim 1 , wherein the closure body forms a mouthpiece portion through which air can be drawn through the airflow pathway of the aerosol generating device.
5. The electrically heated aerosol-generating device according to claim wherein the first hollow shaft portion and the second hollow shaft portion are electrically conductive and arranged to connect the one or more electric heaters to an electrical power supply.
6. The electrically heated aerosol-generating device according to claim 1 , wherein the heater assembly comprises:
a plurality of electric heaters, the plurality of heaters being fixed to and spaced along a length of the elongate piercing assembly.
7. The electrically heated aerosol-generating device according to claim 6 , wherein the plurality of electric heaters comprises:
one or more electric heaters fixed to the first hollow shaft portion; and
one or more electric heaters fixed to the second hollow shaft portion.
8. The electrically heated aerosol-generating device according to claim 6 , wherein each of the plurality of electric heaters extend across the internal airflow passage transverse to a longitudinal direction of the elongate piercing assembly.
9. The electrically heated aerosol-generating device according to claim 6 , wherein at least one of the first hollow shaft portion and the second hollow shaft portion comprises:
a plurality of apertures in which the plurality of electric heaters are held, the plurality of electric heaters being in fluid communication with the storage portion of a cartridge received in the cavity through the plurality of apertures.
10. An electrically heated aerosol-generating system comprising:
an electrically heated aerosol-generating device according to claim 1 ; and
a consumable cartridge including,
a storage portion configured to contain an aerosol forming substrate, the storage portion having a fluid permeable internal surface surrounding an open ended passage extending through the cartridge, the cartridge being enclosed in the cavity such that the elongate piercing assembly extends into the open ended passage of the cartridge.