DESC:FIELD OF THE INVENTION

The present invention relates to a heater assembly that generates aerosol in an aerosol-generating device. Particularly, the aerosol-generating device is an electrically operated smoking device.

BACKGROUND OF THE INVENTION

There is an increasing demand for handheld aerosol-generating devices that are able to deliver aerosol for user inhalation. One particular area of demand is for heated smoking devices in which an aerosol-forming substrate is heated to release volatile flavour compounds, without combustion of the aerosol-forming substrate. The released volatile compounds are conveyed within an aerosol to the user.

Various attempts have been made to provide alternatives to these smoking articles by creating products which generates aerosol without burning the tobacco. Electronic vaporizers also known as electronic cigarettes and electronic cigars were thus developed as an alternative solution and are becoming increasingly popular all over the world. Electrically operated smoking devices are alternatives for conventional cigarettes whereby aerosol is generated by heating, but not burning, tobacco and additionally give a wide variety of appealing flavour choices.

Tobacco heating is one of the key focuses of developments in an aerosol-generating system, wherein the aim is to deliver aerosol rather than following the conventional route of burning the tobacco. One of the means to supply heat to the tobacco is by electrical heating. An aerosol- generating device configured with a heater assembly that receives the aerosol-generating article can be heated either directly or indirectly by converting the electrical energy to thermal energy. It is therefore desirable to provide a heater assembly for an aerosol-generating device which achieves a uniform heat distribution in the aerosol-forming substrate with a controlled temperature for an effective release of the volatile compounds by eliminating the process of combustion.

Various types of heating assembly for generating aerosol in an aerosol-generating device are known in the art. One type of heating assembly known for heated smoking devices operates by inserting a heater into a solid aerosol-forming substrate, such as a plug of tobacco which allows the substrate to be heated directly.

WO 2016124552 A1 dated August 11, 2016 discloses a heating assembly for an aerosol-generating device comprising a heater and a heater mount, wherein the heater is substantially blade-shaped for insertion into the aerosol-forming substrate and the heater mount provides structural support to the heater.

US 20170042243 A1 dated February 16, 2017 discloses a heater element comprising an end face which is positioned proximate to an end of an aerosol-forming article, when the said aerosol-forming article is inserted into the tubular portion of the aerosol-generating device. The heater element is cylindrical or disc shaped.

WO 2011076407 A1 dated Jun 30, 2011 discloses an elongate heater for an electrically heated aerosol-generating system comprising a first electrically conductive element electrically insulated from a second electrically conductive element by an electrically insulating portion, the first and second elements being elongate and being electrically connected to each other by an electrically resistive portion.

EP2797445 B1 dated May 4, 2016 discloses an aerosol-generating device comprising: a substrate receiving cavity configured to receive an aerosol-forming substrate; an internal heater positioned within the substrate receiving cavity; an external heater positioned on a perimeter of the substrate receiving cavity; and a controller configured to control a supply of power to the internal heater or to the external heater, or to both the internal heater and the external heater, so that the external heater has a lower temperature than the internal heater.

However, design and construction of the heater assembly used in the conventional aerosol-generating devices suffer from many drawbacks such as uneven heat distribution throughout the substrate, difficulty in heating the entire substrate to within the optimum temperature range and achieving a controlled temperature, inability to adjust airflow according to user needs, lack of robustness, and complexity in design.

The present inventors have surprisingly developed a heater assembly that generates aerosol in an aerosol-generating device that ameliorates the aforementioned shortcomings of the prior art.

OBJECTS OF THE INVENTION

It is an object of the present invention to provide a heater assembly for an aerosol-generating device that provides a uniform heat distribution throughout the aerosol-forming substrate present within an aerosol-generating article.

It is another object of the present invention to provide a heater assembly for an aerosol-generating device that maintains a controlled temperature.

It is another object of the present invention to provide a heater assembly for an aerosol-generating device which has a simple, effective, robust design and is inexpensive to manufacture.

It is another object of the present invention to provide a heater assembly with an airflow adjustor for an aerosol-generating device that allows the user to control the aerosol delivery according to his requirements.

SUMMARY OF THE INVENTION

It is an aspect of the present invention to provide a heater assembly for an aerosol-generating device.

It is another aspect of the present invention to provide an aerosol-generating device.

Accordingly, the present invention discloses an electrically heated aerosol-generating system comprising an aerosol-generating device and an aerosol-generating article wherein the aerosol-generating device comprising at least one air vent in the tubular outer case housing to allow air to flow into the aerosol-generating device when a user draws on the mouth end of the said aerosol-generating article; a heating assembly enclosed by a heater outer sleeve; the said heater assembly comprising a primary heater having at least one air channel, wherein the primary heater having at least one air channel is adapted to be positioned downstream of the air vent in the aerosol-generating device and proximate to an end of the aerosol-generating article; and a tubular outer case housing adapted to receive an aerosol-forming substrate into the thermal proximity of the heater assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:

Figure 1 illustrates schematic representation of an aerosol-generating device that receives an aerosol-generating article comprising an aerosol-forming substrate in accordance to an embodiment of the present invention.

Figure 1a illustrates schematic representation of an aerosol-generating device comprising a primary heater having at least one air channel in the heater assembly that receives an aerosol-generating article comprising an aerosol-forming substrate in accordance to an embodiment of the present invention.

Figure 1b illustrates schematic representation of an aerosol-generating device comprising a primary heater having at least one air channel and a secondary heater at the core region in the heater assembly that receives an aerosol-generating article comprising an aerosol-forming substrate in accordance to an embodiment of the present invention.

Figure 1c illustrates schematic representation of an aerosol-generating device comprising a primary heater having at least one air channel and a secondary heater at the periphery region in the heater assembly that receives an aerosol-generating article comprising an aerosol-forming substrate in accordance to an embodiment of the present invention.

Figure 1d illustrates schematic representation of an aerosol-generating device comprising a primary heater having at least one air channel and a secondary heater at the core region and periphery region in the heater assembly that receives an aerosol-generating article comprising an aerosol-forming substrate in accordance to an embodiment of the present invention.

Figure 2: Illustrates an enlarged view of the heater assembly with an airflow adjustor in accordance with an embodiment of the present invention

Figure 2a: Illustrates an enlarged view of the heater assembly with an airflow adjustor in accordance with another embodiment of the present invention

Figure 3: Illustrates the internal arrangement of the components of the heater assembly with an airflow adjustor according to an embodiment of the present invention.

Figure 4: Illustrates the cross-sectional view of the airflow adjustor comprising a rotatable disk with desired number of air channels in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary.

Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the scope of the invention as defined by the appended claims and their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.

It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, steps or components but does not preclude the presence or addition of one or more other features, steps, components or groups thereof.

The present invention relates to a heater assembly for an aerosol-generating device. In particular, the invention relates to handheld aerosol-generating device, such as an electrically operated smoking device.

The term ‘aerosol-generating device’ relates to a device that interacts with an aerosol-forming substrate to generate an aerosol. The aerosol-forming substrate forms a part of an aerosol-generating article, for example part of a smoking article. An aerosol-generating device may be a smoking device that interacts with an aerosol-forming substrate of an aerosol-generating article to generate an inhalable aerosol.

The term ‘aerosol-forming substrate’ relates to a substrate capable of releasing volatile compounds that can form an aerosol. Such volatile compounds may be released by heating the aerosol-forming substrate. An aerosol-forming substrate forms a part of an aerosol-generating article or smoking article.

The terms ‘aerosol-generating article’ and ‘smoking article’ refer to an article comprising an aerosol-forming substrate that is capable of releasing volatile compounds that can form an aerosol. For example, an aerosol-generating article may be a smoking article that generates an inhalable aerosol to the users.

The term ‘aerosol-generating system’ is a combination of an aerosol-generating device and one or more aerosol-generating articles for use with the device.

The term “primary heater” refers to the heater positioned at the proximal end of the aerosol generating article (distal end of the aerosol generating article is the mouth end), which abuts the primary heater.

The term “secondary heater” refers to the heater positioned either at the core or periphery region or both at the core and periphery region of the heating assembly.

The term “core region” refers to the centre position of the aerosol generating article, when the core is heated, the heat transfer occurs radially outwards.

The term “periphery region” refers to the peripheral position of the aerosol generating article, when the periphery is heated, the heat transfer occurs radially inwards.

The terms “upstream” and “downstream” are the relative positions described in relation to the direction of air flow as it is drawn from the air inlet to the air outlet.

The present invention relates to a heater assembly for an aerosol-generating device configured to receive an aerosol-generating article, wherein the said heater assembly comprises a primary heater having at least one air channel. The said primary heater is positioned downstream of the air vent in the aerosol-generating device and at the proximal end of the aerosol-generating article, when the said aerosol-generating article is received into the tubular portion of the said aerosol-generating device;

The heater assembly of the present invention may optionally comprise a secondary heater placed at a position selected from the core region, periphery region or a combination thereof within the said aerosol-generating article, when the said aerosol-generating article is received into the tubular portion of the said aerosol-generating device.

The primary heater and secondary heater of the present invention are operated either at the same temperature or at differential temperatures to achieve uniform heat distribution.

The characteristic features/ advantages of the heater assembly of the present invention to be used in an aerosol-generating device are:
• Primary heater preheats the air as the air takes the tortuous path through the porous aerosol-forming substrate present within the aerosol-generating article; thereby achieving a uniform heat distribution. Preheating the air stabilizes the performance of the aerosol-generating device across a wide range of different temperature environments, especially at low ambient temperatures and may also reduce condensation of droplets onto surfaces, increase vapour production, and give more consistent delivery.
• The primary heater transfers heat to the incoming ambient air that is drawn through the electrically heated aerosol-generating device during use, which in turn heats the aerosol-forming substrate by convection.
• The primary heater is also in direct contact with the aerosol-forming substrate at the proximal end of the aerosol-generating article and thereby heats the substrate axially.
• The heater assembly of the present invention may optionally comprise a secondary heater (that can be either at core or periphery or a combination of both core and periphery) positioned within the aerosol-generating article comprising the aerosol-forming substrate enables the tobacco substrate to be heated either from core or periphery or both. The heat transfer occurs radially outwards, in case of core to periphery, wherein said heater placed at the core, is in direct contact with the aerosol generating substrate (e.g. tobacco) whereas, in case of periphery to core, the said heat transfer occurs radially inwards, wherein said heater placed at the periphery will not be in direct contact with the aerosol generating substrate (e.g. tobacco).
• The use of both primary heater and secondary heater allows each heater to achieve a lower operating temperature than would be required when using a single heater alone.
• The primary heater and secondary heater are operated either at the same temperature or at differential temperatures to achieve a uniform heat distribution. When the primary heater is operated at a lower temperature than the secondary heater, overheating of the aerosol-forming substrate present in the aerosol-generating article is prevented. The substrate can be heated to have a relatively uniform temperature distribution, while the external temperature of the device can be kept to an acceptably low level.
• The heater assembly of the present invention provides a uniform heat distribution throughout the aerosol-forming substrate and maintains a controlled temperature, which thereby assists in the release of desired aerosol delivery to the user.
• The heater assembly of the present invention has a simple, effective, robust design and is inexpensive to manufacture.

In an embodiment of the present invention, the heater assembly is in conjunction with an airflow adjustor comprising a rotatable disk with air flow channels positioned adjacent to the said primary heater. The said rotatable disk allows the user to control the aerosol delivery according to their requirements, by aligning the air flow channels on the rotatable disk with the air flow channel of the said primary heater.

The reference numbers of the components according to various embodiments of the present invention are listed below for ready reference:

Reference No Name of the component
10 Aerosol-generating device
11 Tubular outer case housing
12 Power source
13 Control circuit board
14 Heater assembly
15 Aerosol-generating article comprising aerosol-forming substrate
16 Air vents
21 Primary heater having at least one air channel
22 Secondary heater
22a Secondary heater (core)
22b Secondary heater (Periphery)
23 Heater outer sleeve
24 Rotatable disk
25 Air flow channels
26 Airflow adjustor

In an embodiment of the present invention, there is provided an electrically heated aerosol-generating system comprising an aerosol-generating device (10) and an aerosol-generating article (15), for example a tobacco stick. The aerosol-generating article (15) includes an aerosol-forming substrate that is pushed inside the tubular outer case housing (11) of the aerosol-generating device (10) to come into thermal proximity with a portion of a heater assembly (14). The aerosol-forming substrate will release a range of volatile compounds at different temperatures.

In an embodiment of the present invention, there is provided an aerosol-generating device (10) configured to receive an aerosol-generating article (15) comprising:
i. A tubular outer case housing (11) that receives an aerosol-generating article (15) comprising an aerosol-forming substrate;
ii. A power source (12) within the said housing (11) for e.g. a rechargeable lithium ion battery;
iii. A control circuit board (13) connected to the heater assembly (14) and the said power source (12). The said control circuit board (13) controls the power supplied to heater assembly (14) in order to regulate its temperature;
iv. At least one air vent (16) in the said tubular outer case housing (11) to allow air to flow into the aerosol-generating device (10) when the user draws on the mouth end of the said aerosol-generating article (15);
v. A heater assembly (14) enclosed by a heater outer sleeve (23); the said heater assembly (14) comprising a primary heater having at least one air channel (21), Wherein, the said primary heater having at least one air channel (21) is positioned downstream of the air vent (16) in the aerosol-generating device (10) and proximate to an end of the aerosol-generating article (15).
vi. An airflow adjustor (26) comprising a rotatable disk (24) with desired number of air flow channels (25) is positioned adjacent to the said primary heater (21). The said rotatable disk (24) allows the user to control the aerosol delivery according to their requirements, by aligning the air flow channels (25) on the rotatable disk (24) with the air flow channel of the said primary heater (21).

In another embodiment of the present invention, the heater assembly (14) of the aerosol-generating device (10) optionally comprises a secondary heater (22) comprising a heater placed at a position selected from the core region (22a), periphery region (22b) or a combination thereof to heat the aerosol-generating article (15) comprising the aerosol-forming substrate enables the said substrate to be heated either from core to periphery or vice versa.

Regarding operation by a user, of the aerosol-generating device (10) which receives an aerosol-generating article (15) comprising the aerosol-forming substrate according to an embodiment of the present invention:
• When the user draws on the mouth-end of the aerosol-generating article (15), air is drawn into the said aerosol-forming article (15) through air vents (16);
• The user adjusts the rotatable disk (24) with desired number of air flow channels (25) to control the aerosol delivery;
• The control circuit board (13) initializes the heater assembly (14) by passing a current from the power source (12) through the said heater assembly (14). The said control circuit board (13) monitors and maintains the primary heater and secondary heater, either at the same temperature or at differential temperatures to achieve a uniform heat distribution;
• Incoming air from the air vent (16) enters the air channel of the primary heater (21) which is positioned downstream to the said air vent (16). Primary heater (21) preheats the air as the air takes the tortuous path through the porous aerosol-forming substrate present in the aerosol-generating article (15) thereby achieving a uniform heat distribution. The said primary heater (21) transfers heat to the incoming ambient air, which in turn heats the aerosol-forming substrate by convection. The said primary heater (21) in direct contact with the aerosol-forming substrate at the proximal end of the aerosol-generating article (15) also heats the substrate axially;
• The secondary heater (22) when present, comprises a heater positioned either at the core region (22a) or periphery region (22b) or both at the core and periphery region (22a,22b) of the aerosol-generating article (15) comprising the aerosol-forming substrate enables the said substrate to be heated either from core to periphery or vice versa;
• The volatile substances of the aerosol-forming substrate heated by the primary heater (21) and secondary heater (22) thereafter condense to form an inhalable aerosol which passes through the mouth-end of the aerosol-generating article (15) into the user's mouth;
• The said control circuit board (13) switches off the supply of current to the said heater assembly (14) after a predetermined period of time at which the said aerosol-generating article (15) is deemed consumed, or when the user stops puffing on the article, if sooner.

In an embodiment of the present invention, the aerosol-generating device (10) is an electrically heated smoking device.

In an embodiment of the present invention, the primary heater having at least one air channel (21) is selected from a substantially cylindrical, disc, and any polynomial by design (e.g. triangle, square, pentagonal, hexagonal, and the like).

In an embodiment of the present invention, the secondary heater (22) is selected from a blade/flat plate, needle shape, rod shape, ‘s’ shaped, trident shape and the like.

The secondary heater (22) comprises a heater positioned either at the core region (22a) or periphery region (22b) or both at the core and periphery region (22a, 22b) of the said aerosol-generating article (15), when the said aerosol-generating article (15) is received into the tubular portion of the said aerosol-generating device (10).

In an embodiment of the present invention, the said secondary heater comprising a heater positioned at the core region (22a) protrudes through the primary heater (21) at a perpendicular direction which provides mechanical stability to the said secondary heater (22). The said primary heater (21) is placed at a desired distance from the distal end of the secondary heater (22).

In an embodiment of the present invention, the primary heater (21) and the secondary heater (22) contain a base, wherein the heating element is deposited/printed/wired.

The primary heater (21) and secondary heater (22) of the present invention have either the same temperature or operated at differential temperatures to achieve uniform heat distribution. In an embodiment of the present invention, the control circuit board (13) is configured in such a way that the primary heater (21) is operated at a lower temperature than the secondary heater (22).

The primary heater having at least one air channel (21) is configured to have a temperature ranging from 2000C -500 0C. The controller may be configured to control the secondary heater to have a temperature ranging from 200 0C – 500 0C.

In an embodiment of the present invention, the airflow adjustor is a rotatable disk (24) having desired number of air flow channels (25), which is positioned adjacent to the primary heater having at least one air channel (21) and wherein the said secondary heater (placed at core) passes through the said primary heater. It allows the user to control the aerosol delivery according to his requirements by aligning the air flow channels on the rotatable disk with the air flow channel of the said primary heater. The number of air channels (25) varies depending upon the design and requirements.

In an embodiment of the present invention, the heater assembly (14) is enclosed by a heater outer sleeve (23). The aerosol-forming substrate present in the aerosol-generating article (15) may be received in the said sleeve (23). The said sleeve (23) may be used to aid insertion and extraction of the aerosol-forming substrate to and from the device.

In an embodiment of the present invention, the aerosol-forming substrate comprises a tobacco-containing material containing volatile tobacco flavour compounds which are released from the substrate upon heating. In another embodiment, the aerosol-forming substrate comprises a non-tobacco material. In yet another embodiment, the aerosol-forming substrate further comprises an aerosol former that facilitates the formation of a dense and stable aerosol. Examples of suitable aerosol formers are glycerine and propylene glycol.

In an embodiment of the present invention, the aerosol-forming substrate is in the form of a solid aerosol-forming substrate comprising one or more of: powder, granules, pellets, shreds, spaghettis, strips or sheets. In another embodiment, the aerosol-forming substrate is a liquid aerosol-forming substrate retained in a container or absorbed into a porous carrier material.

In an embodiment, the aerosol-generating device further comprises an indicator for indicating when the heater assembly (14) is activated. The said indicator may comprise a light that gets activated upon the activation of the heater assembly.

Referring now to Figure 1, a schematic representation of an aerosol-generating device (10) that receives an aerosol-generating article (15) comprising aerosol-forming substrate according to an embodiment of the present invention is illustrated. It illustrates the components of the said aerosol-generating device (10) such as a tubular outer case housing (11), a power source (12), a control circuit board (13), air vents (16), and a heater assembly (14) with an airflow adjustor (26).

Figure 1a represents the schematic of the aerosol generating device (10) that receives an aerosol-generating article (15) comprising aerosol-forming substrate according to an embodiment of the present invention comprising a primary heater having at least one air channel (21) in the heater assembly (14).

Figure 1b represents the schematic of the aerosol generating device (10) that receives an aerosol-generating article (15) comprising aerosol-forming substrate according to an embodiment of the present invention comprising a primary heater having at least one air channel (21) and a secondary heater at the core region (22a) in the heater assembly (14).

Figure 1c represents the schematic of the aerosol generating device (10) that receives an aerosol-generating article (15) comprising aerosol-forming substrate according to an embodiment of the present invention comprising a primary heater having at least one air channel (21) and a secondary heater at the periphery region (22b) in the heater assembly (14).

Figure 1d represents the schematic of the aerosol generating device (10) that receives an aerosol-generating article (15) comprising aerosol-forming substrate according to an embodiment of the present invention comprising a primary heater having at least one air channel (21) and a secondary heater comprising a heater both at the core region (22a) and periphery region (22b) in the heater assembly (14).

Referring now to Figure 2, an enlarged view of the heater assembly (14) in an aerosol-generating device with an airflow adjustor (26) in accordance with an embodiment of the present invention is illustrated. It illustrates the components of the heater assembly (14) comprising a primary heater having at least one air channel (21) and a secondary heater (22) enclosed by a heater outer sleeve (23). The airflow adjustor (26) comprises a rotatable disk (24) with desired number of air flow channels (25) positioned adjacent to the said primary heater (21).

In Figure 2a the secondary heater (22) comprises a heater positioned at both the core region (22a) and at the periphery region (22b). The airflow adjustor (26) comprises a rotatable disk (24) with desired number of air flow channels (25).

Referring now to Figure 3, an internal arrangement of the components of the heater assembly (14) with an airflow adjustor (26) is illustrated. It illustrates a primary heater having at least one air channel (21), a secondary heater at the core region (22a), and a rotatable disk (24) with desired number of air flow channels (25). The primary heater (21) having at least one air channel is selected from a cylindrical, disc and any polynomial by design (e.g. triangle, square, pentagonal, hexagonal, and the like)]. The secondary heater (22) is selected from a blade/flat plate, needle or rod shaped heater, ‘s’ shaped, trident shape and the like.
According to the embodiment in Figure 3, the secondary heater (22) comprising a heater positioned at the core region (22a) is in the form of a blade shape, wherein the heat transfer occurs radially outwards (core heating).

Referring now to Figure 4, a cross-sectional view of the airflow adjustor (26) comprising a rotatable disk (24) with desired number of air channels (25) in accordance with an embodiment of the present invention is illustrated.

It is to be understood that the heater assembly for an aerosol-generating device of the present invention is susceptible to modifications, changes and adaptations by those skilled in the art. Such modifications, changes and adaptations are intended to be within the scope of the present invention.
,CLAIMS:1. An electrically heated aerosol-generating system comprising an aerosol-generating device (10) and an aerosol-generating article (15) wherein the aerosol-generating device (10) comprises:
at least one air vent (16) in the tubular outer case housing (11) to allow air to flow into the aerosol-generating device (10) when a user draws in on the mouth end of the said aerosol-generating article (15);
a heating assembly (14) enclosed by a heater outer sleeve (23); the said heater assembly (14) comprising a primary heater having at least one air channel (21), wherein the primary heater having at least one air channel (21) is adapted to be positioned downstream of the air vent (16) in the aerosol-generating device (10) and proximate to an end of the aerosol-generating article (15);
a tubular outer case housing (11) adapted to receive an aerosol-forming substrate into the thermal proximity of the heater assembly (14).

2. The electrically heated aerosol-generating system as claimed in claim 1, wherein the heater assembly (14) of the aerosol-generating device (10) comprises a secondary heater (22) configured to heat the aerosol-forming substrate either from the core to the periphery or vice versa.

3. The electrically heated aerosol-generating system as claimed in claim 2, wherein the secondary heater (22) comprises a heater adapted to be placed at a position selected from the core region (22a), periphery region (22b) or a combination thereof to heat the aerosol-forming substrate.

4. The electrically heated aerosol-generating system as claimed in claim 2, wherein the primary heater is placed at a desired distance from the distal end of the secondary heater (22).

5. The electrically heated aerosol-generating system as claimed in claim 2, wherein the secondary heater comprising a heater positioned at the core region (22a) protrudes through the primary heater at a perpendicular direction providing mechanical stability to the secondary heater (22).

6. The electrically heated aerosol-generating system as claimed in claim 2, wherein the primary heater (21) and the secondary heater (22) comprise a base containing the heating element.

7. The electrically heated aerosol-generating system as claimed in claim 1, wherein the heater assembly (14) of the aerosol-generating device (10) comprises a power source (12) within the housing (11).

8. The electrically heated aerosol-generating system as claimed in claim 1, wherein the heater assembly (14) of the aerosol-generating device (10) comprises a control circuit board (13) connected to the heater assembly (14) and the power source (12), configured to control the power supplied to the heater assembly (14).

9. The electrically heated aerosol-generating system as claimed in claim 1, wherein the heater assembly (14) of the aerosol-generating device (10) comprises an airflow adjustor (26) comprising a rotatable disk (24) with desired number of air flow channels (25) positioned adjacent to the primary heater (21).

10. The electrically heated aerosol-generating system as claimed in claim 9, wherein the rotatable disk (24) is configured to control the aerosol delivery according to the requirements of the user by aligning the air flow channels (25) on the rotatable disk (24) with the air flow channel of the primary heater (21).

11. The electrically heated aerosol-generating system as claimed in claim 1, wherein the aerosol-generating device comprises an indicator for indicating when the heater assembly (14) is activated.

12. The electrically heated aerosol-generating system as claimed in claim 1, wherein the primary heater (21) is configured to heat the aerosol-forming substrate by convection and by direct contact.