DESC:
Field of Invention
The present invention relates to an aerosol generating device and, more particularly the present invention relates to an induction heating aerosol generating device having a chassis and an enclosure wherein there is an inner dimension of the enclosure, which is higher than the outer dimension of the induction coil heating assembly hence provides empty space for air insulation.

Background of Invention
In aerosol generating devices, heating of the aerosol generating substrate can be done through technologies such as resistive heating, induction heating, infrared heating, dielectric heating and the like.

Aerosol generating devices, operating on induction heating, device consists of a device housing comprising a cavity and the aerosol generating article can be at least partially inserted inside the cavity. The cavity has an induction coil surrounding it which creates induction field. The prior art also discloses a recessed section within device body and placement of induction coil inside the recess segment.

TW201811205A discloses an electrically operated aerosol-generating device (100) for heating an aerosol-generating article (10) including an aerosol-forming substrate (20) by heating a susceptor element (30) positioned to heat the aerosol-forming substrate. The device includes a housing (110) defining a chamber (120) for receiving at least a portion of the aerosol-generating article, an inductor (200) comprising an inductor coil (210) disposed around at least a portion of the chamber, and a power source (140) connected to the inductor coil and configured to provide a high frequency electric current to the inductor coil such that, in use, the inductor coil generates a fluctuating electromagnetic field to heat the susceptor element and thereby heat the aerosol-forming substrate. The inductor further includes a flux concentrator (230) disposed around the inductor coil and configured to distort the fluctuating electromagnetic field, generated by the inductor coil during use, towards the chamber. The inductor further comprises a cushioning element positioned between the flux concentrator and the device housing.

CN112087961 discloses an aerosol delivery device that includes an aerosol precursor segmented within a reservoir and a nebulizer configured to generate heat by induction. The atomizer has an inductive emitter and an inductive receiver in operable contact with the aerosol precursor within the reservoir and configured to wick the aerosol precursor into the range of the inductive emitter to be heated and vaporized.

WO2021037820A1 describes an aerosol-generating device comprising an induction heating arrangement with improved operational and heating efficiency. They describe susceptor with a sidewall arrangement which may be permeable for lateral airflow to enter the cavity.

WO2021140018A1 describes a heater for an aerosol-generating device. The heater may comprise a flexible electrically insulating substrate. The flexible electrically insulating substrate comprises a first portion and a second portion. First portion of the flexible electrically insulating substrate is arranged at least partly coaxially surrounding the outer perimeter of the second portion of the flexible electrically insulating substrate.

US2023012249A1 describes a heat insulator configured to reduce conduction of heat from the susceptor to the outside, the heat insulator comprising a tube wall, and a central region defined by the tube wall, the tube wall containing a metal or an alloy, and the pressure in the central region being configured to be lower than the pressure outside the heat insulator; and a magnetic field shield, configured to isolate the heat insulator from a varying magnetic field, so as to prevent the heat insulator from being penetrated by the varying magnetic field to generate heat.

However, the above discussed devices do not have enough room for insulating the heat emanating from the coil assembly hence they make the devices hotter.

Therefore, there is a need to provide an improved induction based aerosol generating device that provides better thermal and battery management and overall consumer acceptance while overcoming the above discussed issues.

Object of the invention
It is an object of the present invention to provide an improved induction-based aerosol generating device that provides better thermal and battery management.

Summary of the Invention
In an aspect of the present invention, there is provided an aerosol generating device comprising: a chassis comprising of cavity, induction heating assembly surrounding the cavity, comprising of induction coil, flux concentrator, magnetic shield, surrounding the flux concentrator, optionally a high temperature heat shrinkable material surrounding the Induction heating assembly; a controlling unit, rechargeable power source; an enclosure; wherein the inner dimension of enclosure is higher than the outer dimension of the Induction heating assembly.

Other aspects, advantages and salient features of the invention will become apparent to those skilled in the art from the detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

Brief Description of the accompanying drawings
The above and other features, aspects, and advantages of the subject matter will be better understood with regard to the following description and accompanying drawings.

Figure 1 illustrates an aerosol generating device according to one embodiment of the present invention.

Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may not have been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

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.

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.

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” if used in this specification is taken to specify the presence of stated features, integers, steps or component but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

In an aspect of the present invention, there is provided an aerosol generating device comprising: a chassis (1) comprising of cavity (2), induction heating assembly surrounding the cavity, comprising of induction coil (4), flux concentrator (5), magnetic shield (6), surrounding the flux concentrator (5), optionally a high temperature heat shrinkable material (7) surrounding the Induction heating assembly; a controlling unit (9), rechargeable power source (10); an enclosure (8); wherein, the inner dimension of enclosure (8) is higher than the outer dimension of the Induction heating assembly.

In another aspect of the present invention, there is provided an aerosol generating device wherein the Cavity (2) is used for the partial or complete insertion of an aerosol generating article.

In another aspect of the present invention, there is provided an aerosol generating device, wherein the aerosol generating article comprises at least one aerosol generating substrate.

In another aspect of the present invention, there is provided an aerosol generating device, wherein the aerosol generating article comprises at least one susceptor (3).

In another aspect of the present invention, there is provided an aerosol generating device, wherein the Cavity (2) exterior wall parts have grooves and crests, through which the induction coil (4) runs and are arranged in circular and non-circular fashion.

In another aspect of the present invention, there is provided an aerosol generating device, wherein the controlling unit (9) is suitable to provide high voltage current to the Induction coil (4).

In another aspect of the present invention, there is provided an aerosol generating device, wherein the induction coil (4) turns are arranged in such a way that it ensures uniform heating across the horizontal cross section and temperature at the end of the susceptor (3) is at least 20°C lower than the highest temperature at the middle of the susceptor (3).

In another aspect of the present invention, there is provided an aerosol generating device, wherein the Flux concentrator (5) is used to concentrate the flux lines for better thermal management.

In another aspect of the present invention, there is provided an aerosol generating device, wherein the Magnetic shield (6) is used to arrest stray flux lines.

In another aspect of the present invention, there is provided an aerosol generating device, wherein the high temperature heat shrinkable material (7) is placed around the Induction heating assembly to ensure physical adherence of the entire assembly and keep the assembly in place.

In another aspect of the present invention, there is provided an aerosol generating device, wherein the induction heating assembly provides mechanical strength, ensuring centrality of the coil assembly with the enclosure and providing optimal performance.

The present invention describes an aerosol generating device which works on susceptor heating technology wherein the device comprises: a chassis: made of electrically and magnetically nonconductive material having a proximal end and a distal end. The proximal end has a tubular shaped cavity for complete insertion of the susceptor and at least partial insertion of the aerosol generating article wherein the exterior of the cavity wall has grooves and crests. The aerosol generating article includes aerosol generating substrate and susceptor. The susceptor is an integral part of the aerosol generating article (not shown in the figure). The cavity has an induction coil wrapped around it and running through the grooves and separated by those crests to create magnetic flux lines parallel to the longitudinal axis of the chassis wherein the coil has a flux concentrator to concentrate the flux lines for better thermal management and a magnetic shield around the flux concentrator to arrest stray flux lines and a high temperature heat shrinkable material around the coil assembly to ensure physical adherence of the entire assembly and keeping the assembly in place wherein, the induction coil has coil material having circular or non-circular cross section and has stepping of coil turn to ensure uniform heating across the horizontal cross section and the coil turns are designed in such a way that the temperature at the end of the susceptors is at least 20 °C lower than the highest temperature at the middle of the susceptor having grooves and crests on the exterior surface of the tubular segment of the chassis through which the induction coil runs having a controlling unit suitable to provide high frequency current to the coil, and a rechargeable power source as integral part of the chassis, an enclosure to enclose the chassis wherein the internal dimension of the enclosure is higher than the outer dimension of the coil assembly to promote air cooling of the coil assembly.

The induction coil assembly is an integral part of the chassis hence provides mechanical strength, ensuring centrality of the coil assembly with the enclosure and providing optimal performance.

The present invention mentions the single body chassis on which all major components of the device such as induction heating assembly, battery and PCBA are mounted. It results in easier manufacturability of the device.

Positioning of the coil is a key parameter in determining the efficiency of the heating of substrate present inside the cavity. Thus, it is highly desirable to have consistency in the positioning of coil placed inside the device. The use of chassis in the aerosol generating device helps to ensure consistent position of coil during manufacturing and usage of the aerosol generating device.

The higher inner dimension of the enclosure compared to the induction heating assembly ensures that there is air gap between the enclosure and heating assembly which helps in efficient heat management of the heating assembly.
,CLAIMS:
1. An aerosol generating device comprising:
a chassis (1) comprising a cavity (2),
an induction heating assembly surrounding said cavity, comprising induction coils (4), flux concentrator (5), magnetic shield (6) surrounding the flux concentrator (5),
a controlling unit (9),
a rechargeable power source (10); and
an enclosure (8);
wherein, the inner dimension of enclosure (8) is higher than the outer dimension of the Induction heating assembly.

2. The device as claimed in claim 1, comprising a high temperature heat shrinkable material (7) surrounding the induction heating assembly.

3. The device as claimed in claim 1, wherein the cavity (2) is adapted to insert an aerosol generating article partially or completely.

4. The device as claimed in claim 3, wherein the aerosol generating article comprises at least one aerosol generating substrate.

5. The device as claimed in claim 4, wherein the aerosol generating article comprises at least one susceptor (3).

6. The device as claimed in claim 1, wherein the cavity (2) exterior wall parts comprise grooves and crests, through which the induction coil (4) is adapted to run through and are arranged in circular and non-circular fashion.

7. The device as claimed in claim 1, wherein the controlling unit (9) is configured to provide high voltage current to the induction coil (4).

8. The device as claimed in claim 1, wherein the induction coil (4) is arranged such that the coil provides uniform heating across the horizontal cross section and temperature at one end of the susceptor (3) is at least 20°C lower than the highest temperature at the middle of the susceptor (3).

9. The device as claimed in claim 1, wherein the Flux concentrator (5) is adapted to concentrate the flux lines for better thermal management.

10. The device as claimed in claim 1, wherein the Magnetic shield (6) is adapted to arrest stray flux lines.

11. The device as claimed in claim 2, wherein the high temperature heat shrinkable material (7) is placed around the induction heating assembly such that the material provides physical adherence of the entire assembly and keeps the assembly in place.

12. The device as claimed in claim 1, wherein the induction heating assembly is adapted to provide mechanical strength, ensuring centrality of the coil assembly with the enclosure and providing optimal performance.