Aerosol generation device, and heating chamber therefor
An aerosol generation device has a heating chamber for receiving a substrate carrier containing an aerosol substrate. The heating chamber includes an open end through which the substrate carrier is insertable in a direction along a length of the heating chamber. A tubular wall defines an interior volume of the heating chamber and a plurality of engagement elements are each formed from a portion of the tubular wall. Each of the plurality of engagement elements is arranged to extend from an interior surface of the tubular wall at a different location around the tubular wall such that a cross sectional area of the interior volume of the heating chamber is reduced for at least a portion of the length of the heating chamber. These engagement elements serve to grip or to compress the substrate carrier in the heating chamber.
1. A heating chamber for an aerosol generation device, the heating chamber comprising:
an open end through which a substrate carrier including aerosol substrate is insertable in a direction along a length of the heating chamber;
a tubular wall defining an interior volume of the heating chamber; and
a plurality of engagement elements each formed from a portion of the tubular wall;
wherein each of the plurality of engagement elements is arranged to extend from an interior surface of the tubular wall at a different location around the tubular wall such that a cross sectional area of the interior volume of the heating chamber is reduced for at least a portion of the length of the heating chamber, and
wherein at least one of the plurality of engagement elements has an upper end located within the interior volume closest to the open end of the heating chamber, wherein the upper end is spaced from the open end, and/or wherein at least one of the plurality of engagement elements has a lower end located closest to a base of the heating chamber, wherein the lower end is spaced away from the base.
2. The heating chamber of claim 1 , wherein the plurality of engagement elements includes a first engagement element and a second engagement element, the first engagement element and the second engagement element being arranged to extend from the interior surface of the tubular wall opposite to one another.
3. The heating chamber of claim 1 , wherein each of the plurality of engagement elements comprises a deformation of the tubular wall.
4. The heating chamber of claim 1 , wherein a thickness of the tubular wall is substantially constant in a circumferential and/or axial direction.
5. The heating chamber of claim 1 , wherein at least one of the plurality of engagement elements is elongate in the direction along the length of the heating chamber.
6. The heating chamber of claim 1 , wherein at least one of the plurality of engagement elements has a profile in a plane parallel to the length of the heating chamber that curves convexly towards the interior volume.
7. The heating chamber of claim 1 , wherein at least one of the plurality of engagement elements has a profile in a plane parallel to the length of the heating chamber having at least one straight side facing into the interior volume.
8. The heating chamber of claim 1 , wherein the base is at an end of the heating chamber opposite to the open end.
9. The heating chamber of claim 8 , further comprising a platform extending inwardly from the base.
10. An aerosol generation device, comprising:
an electrical power source;
the heating chamber of claim 1 ;
a heater arranged to supply heat to the heating chamber; and
control circuitry configured to control a supply of electrical power from the electrical power source to the heater.
11. The aerosol generation device of claim 10 , wherein the heating chamber is removable from the aerosol generation device.
12. A system comprising the heating chamber of claim 1 , in combination with a substrate carrier, wherein the substrate carrier comprises a first portion containing aerosol substrate at a first end of the substrate carrier, and a second portion for aerosol collection, wherein the interior volume of the heating chamber has a width greater than a width of the substrate carrier, but a radius of the interior volume of the heating chamber, where the cross sectional area of the interior volume of the heating chamber is reduced, is less than a radius of the substrate carrier.
13. The system of claim 12 , wherein at least one of the plurality of the engagement elements extend inwardly a sufficient distance to form friction fit with the substrate carrier.
14. The system of claim 12 , wherein at least one of the plurality of engagement elements extends inwardly a sufficient distance to compress the aerosol substrate within the substrate carrier.
15. The system of claim 12 , wherein the substrate carrier comprises a tubular outer layer surrounding at least the aerosol substrate and, when the substrate carrier is inserted in the heating chamber, the tubular outer layer is inwardly deformed by the plurality of engagement elements at the location of the plurality of engagement elements and is substantially non-deformed away from the location of the plurality of engagement elements such that an air gap is provided between the tubular outer layer and the heating chamber away from the plurality of engagement elements.
16. The system of claim 12 , wherein at least one of the plurality of engagement elements is shaped and sized so that a portion of such engagement elements closest to the open end substantially aligns with a boundary between the first portion of the substrate carrier containing the aerosol substrate and the second portion for aerosol collection when the substrate carrier is fully inserted into the heating chamber.
17. A heating chamber for an aerosol generation device, the heating chamber comprising:
an open end through which a substrate carrier including aerosol substrate is insertable in a direction along a length of the heating chamber;
a tubular wall defining an interior volume of the heating chamber;
a plurality of engagement elements each formed from a portion of the tubular wall; and
a heater on an outer surface of the tubular wall, the heater extending along the length the heating chamber so as to at least partly overlap at least one of the plurality of engagement elements;
wherein each of the plurality of engagement elements is arranged to extend from an interior surface of the tubular wall at a different location around the tubular wall such that a cross sectional area of the interior volume of the heating chamber is reduced for at least a portion of the length of the heating chamber.
18. The heating chamber of claim 17 , wherein the heater comprises a resistive path having first portions running along the length of the heating chamber and wherein the first portions are located on the outer surface of the tubular wall at locations other than those corresponding to those of the plurality of engagement elements.
19. The heating chamber of claim 18 , wherein the heater comprises a resistive path having second portions extending across the length of the heating chamber and wherein the second portions are located on the outer surface of the tubular wall at locations corresponding to those of the plurality of engagement elements.
20. The heating chamber of claim 17 , further comprising a layer between the heater and the outer surface of the tubular wall, the layer having a higher thermal conductivity than the tubular wall.
21. The heating chamber of claim 20 , wherein the layer extends along the length of the heating chamber to an extent greater than that along which the heater extends.
22. A heating chamber for an aerosol generation device, the heating chamber comprising:
an open end through which a substrate carrier including aerosol substrate is insertable in a direction along a length of the heating chamber;
a tubular wall defining an interior volume of the heating chamber;
a plurality of engagement elements each formed from a portion of the tubular wall; further comprising; and
a temperature sensor located on the outer surface of the tubular wall;
wherein each of the plurality of engagement elements is arranged to extend from an interior surface of the tubular wall at a different location around the tubular wall such that a cross sectional area of the interior volume of the heating chamber is reduced for at least a portion of the length of the heating chamber.
23. The heating chamber of claim 22 , wherein one or more of the plurality of engagement elements is formed by indenting the tubular wall from the outer surface and the temperature sensor is located in an indent on the outer surface of the tubular wall.