Induction Heating Assembly for a Vapour Generating Device

Abstract

An induction heating assembly for a vapour generating device includes a rechargeable power source and an induction coil. The induction coil is arranged to heat, in use, a susceptor and is also arranged to receive, in use, an electromagnetic field generated by an external source to charge the power source.

Claims

1. A vapour generating device for generating a vapour to be inhaled by a user by inductively heating a vaporisable substance comprising: an induction heating assembly comprising an induction coil, a rechargeable power source and an induction controller, wherein the induction coil is substantially cylindrical in shape and wherein the induction controller is configured to be manually operated by a user to select a heat setting for adjusting a current through the induction coil.

2. The vapour generating device according to claim 1, wherein the induction heating assembly is configured to operate at a frequency of between 80 kHz and 500 kHz.

3. The vapour generating device according to claim 1, wherein the induction heating assembly is configured to operate at a frequency of between 80 kHz and 250 kHz.

4. The vapour generating device according to claim 1, wherein the induction heating assembly is configured to operate at a frequency of between 150 kHz and 500 kHz.

5. The vapour generating device according to claim 1, wherein the induction heating assembly is configured to operate at a frequency of between 150 kHz and 250 kHz.

6. The vapour generating device according to claim 1, wherein the induction heating assembly is configured to operate at a frequency of between 150 kHz and 200 kHz.

7. The vapour generating device according to claim 1, wherein the induction controller is configured to adjust the current through the induction coil according to predetermined parameters.

8. The vapour generating device according to claim 1, further comprising a heating compartment configured to receive a substantially cylindrical member to be heated.

9. The vapour generating device according to claim 8, further comprising a substantially cylindrical member including a vaporisable substance.

10. The vapour generating device according to claim 9, wherein the vaporisable substance is tobacco.

11. The vapour generating device according to claim 9, wherein the substantially cylindrical member further includes a body having an air permeable layer or membrane that contains the vaporisable substance.

12. The vapour generating device according to claim 11, wherein the body is formed substantially in the shape of a stick.

13. The vapour generating device according to claim 9, wherein the vaporisable substance is wrapped in paper.

14. The vapour generating device according to claim 8, further comprising an air inlet arranged to provide air to the heating compartment and an air outlet in communication with the heating compartment.

15. The vapour generating device according to claim 14, wherein the device is configured such that vapour generated by heating a vaporisable substance exits the heating compartment through the air outlet to be inhaled by a user of the device, and wherein the air outlet is removable from the device.

16. The vapour generating device according to claim 1, wherein the induction coil comprises a Litz wire or Litz cable.

17. The vapour generating device according to claim 1, further comprising a mouthpiece configured to be installed on the device.

18. The vapour generating device according to claim 1, wherein the induction coil is configured to receive power generated by an external source to inductively and wirelessly charge the rechargeable power source.

19. A vapour generating device charging system comprising: the vapour generating device according to claim 1, and a charging device configured to provide wireless charging to the rechargeable power source of the vapor generating device.

20. A system for generating a vapour to be inhaled by a user by inductively heating a vaporisable substance comprising: a susceptor, an induction coil configured to heat the susceptor; a rechargeable power source; and an induction controller, wherein the induction coil is substantially cylindrical in shape and wherein the induction controller is configured to be manually operated by a user to select a heat setting for adjusting a current through the induction coil.

21. The system according to claim 20, wherein the susceptor is comprised of a material that includes at least one of aluminium, iron, nickel, stainless steel, or alloys thereof.

22. The system according to claim 20, wherein the susceptor is comprised of Nickel Chromium.

23. The system according to claim 20, further comprising a heating compartment configured to receive a vaporisable substance, and wherein the susceptor is configured to be in indirect contact with the vaporisable substance.

24. The system according to claim 20, further comprising a mouthpiece.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The invention will now be described by way of example with reference to the accompanying drawings, in which:

[0044] FIG. 1 schematically illustrates an induction heating assembly according to an example of the present invention.

[0045] FIG. 2A schematically illustrates the flow of current through the induction heating assembly of FIG. 1, when operating to heat an external susceptor.

[0046] FIG. 2B schematically illustrates the flow of current through the induction heating assembly of FIG. 1, when operating to charge the rechargeable power source.

[0047] FIG. 3 schematically illustrates how the induction heating assembly of FIGS. 1, 2A and 2B may interact with an external source of electromagnetic field.

[0048] FIG. 4 schematically illustrates an exploded view of a vapour generating device according to an example of the present invention.

[0049] FIG. 5 schematically illustrates the vapour generating device of FIG. 4, in use.

[0050] FIG. 6 schematically illustrates another example of how the induction heating assembly of FIGS. 1, 2A and 2B may interact with an example external source of electromagnetic field.

DETAILED DESCRIPTION

[0051] FIG. 1 schematically illustrates an induction heating assembly 10 according to an example of the present invention. In this example, the heating assembly 10 includes an induction coil 12 and a rechargeable power source 13. The power source 13 and the induction coil 12 are placed in electrical connection such that electrical power can be selectively transmitted between the two components. The induction coil 12 is arranged to heat an external susceptor by receiving electrical power from the power source 13 and producing an electromagnetic field. The induction coil 12 is further arranged to receive an externally generated electromagnetic field, to selectively induce an electrical current to charge the rechargeable power source 13. In this example, the induction coil 12 is substantially cylindrical such that the form of the induction heating assembly 10 is also substantially cylindrical.

[0052] When operating to heat an external susceptor, an alternating current changed from a direct current supplied by the power source 13 flows through the induction coil 12 to generate a controlled electromagnetic field in a region near the coil 12. The electromagnetic field generated provides a source for an external susceptor to absorb the electromagnetic energy and convert it to heat, thereby achieving induction heating.

[0053] The induction heating assembly 10 of FIG. 1 can also be operated to inductively charge the power source 13 when an external source of electromagnetic field is placed near the induction coil 12. When operating to charge the rechargeable power source 13, the induction coil 12 interacts with an external field to absorb electromagnetic energy and induce an alternating current, which is changed to a direct current and transferred to the power source 13 to provide inductive charging. In this manner, the induction coil 12 provides means for both the heating and the charging functionalities of the induction heating assembly 10.

[0054] In some examples, the induction heating assembly 10 further comprises an induction controller 14, as shown FIGS. 2A and 2B. In this example, the induction controller 14 is arranged to be, in use, in electrical connection with the power source 13 and the induction coil 12, so as to selectively control the electrical current flowing between the power source 13 and the induction coil 12 such that the extent of heating or charging may be regulated. The induction controller 14 is capable of being manually operated by the user to select a heat setting, or programmed to automatically adjust the current through the induction coil 12 according to predetermined parameters.

[0055] The induction heating assembly 10 further comprises an inverter arranged to change a direct current from the power source 13 to an alternating high-frequency current for driving the induction coil 12, and a rectifier arranged to change an alternating high-frequency current from the induction coil 12 to a direct current for charging the power source 13.

[0056] FIG. 2A illustrates the flow of current through the induction heating assembly 10 when operating to heat an external susceptor. Electrical current from the power source 13, converted to a high-frequency alternating current by the inverter, is selectively supplied to the induction coil 12 by the induction controller 14. The alternating current in the induction coil 12 produces a dynamic electromagnetic field in the region of the coil 12, which can be absorbed by an external susceptor to achieve inductive heating.

[0057] FIG. 2B illustrates the flow of current through the induction heating assembly 10 when operating to charge the rechargeable power source 13. Power is received at the induction coil 12 in the form of a dynamic electromagnetic field generated by an external source. The electromagnetic field produces an electromotive force in the induction coil 12 to generate a high-frequency alternating electrical current. The alternating current from the induction coil 12, converted to a direct current by the rectifier, is selectively supplied to the rechargeable power source 13 by the induction controller 14. In this way, the rechargeable power source 13 can be inductively and wirelessly charged by an external source of electromagnetic field, using the induction coil 12 as a receiving susceptor (or equivalently as the secondary winding of a transformer arrangement as is well-known in the art of inductive charging).

[0058] Although for the sake of clarity the inverter and the rectifier have been described as separate components, these components can be the same member arranged to operate in reverse, to selectively change a direct current from the power source 13 to a high-frequency alternating current and to selectively change a high-frequency alternating current from the induction coil 12 to a direct current.

[0059] FIG. 3 schematically illustrates two examples of how the induction heating assembly 10 of FIGS. 1, 2A and 2B can interact with an external source of electromagnetic field. As shown in FIG. 3, one possible configuration of the induction heating assembly 10 and the external source 17 of electromagnetic field has at least a portion of the induction heating assembly 10 inserted in a volume of the external source 17 of electromagnetic field. In this configuration, the induction heating assembly 10 is inserted in the external source 17 such that the induction coil 12 of the heating assembly 10 is substantially overlapping with a region of electromagnetic field generation of the external source 17. In this example, the external electromagnetic field is generated by a generating coil in the external source 17, but the field may be produced by any other suitable means, for example by a point source.

[0060] In another example, the induction heating assembly 10 is arranged to receive a portion of the external source 17 of electromagnetic field within a volume of the heating assembly 10. In this example, the external source 17 is inserted in the induction heating assembly 10 such that the field generating component of the external source 17 is substantially contained within the interior of the induction coil 12. This arrangement allows the induction heating assembly to be charged safely and reliably while maintaining a compact form.

[0061] The induction heating assembly 10 is capable of being operated to charge the power source 13 in either of the above configurations, with the configuration being chosen to suit the needs of the user's demands. For example, it may be desirable to operate at the same time both the heating and charging functionalities of the induction heating assembly 10, in which case an external source 17 of electromagnetic field which wraps around the induction heating assembly 10 is desirable.

[0062] FIG. 4 schematically illustrates an exploded view of a vapour generating device 20 according to an example of the present invention. In this example, the vapour generating device comprises the induction heating assembly 10 and further comprises a heating compartment 21, arranged to receive a body 22 comprising a vaporisable substance 23 and an induction heatable susceptor 24. The heating compartment 21 is at least partially adjacent to or contained in the volume of the induction coil 12. An air inlet 25 positioned adjacent to the heating compartment 21 provides air from the surrounding environment to the heating compartment 21. An air outlet 26 is in communication with the heating compartment 21 and provides for the ability to extract vapour produced within the heating compartment 21. All, or some of the components shown in FIG. 4 are arranged to be removable, and FIG. 5 illustrates how the various components of the vapour generating device 20 shown in FIG. 4 assemble together in use.

[0063] The heating compartment 21 is arranged to receive a body 22 comprising a vaporisable substance 23 and an induction heatable susceptor 24. Preferably, the body 22 has a layer or membrane to contain the vaporisable substance, with the layer or membrane being air permeable. For example, the body 22 may be a disposable capsule containing tobacco and at least one induction heatable susceptor element. The susceptor 24 can be in direct or indirect contact with the vaporisable substance 23, such that when the susceptor 24 is inductively heated by the induction coil 12 of the induction heating assembly 10, heat is transferred from the susceptor 24 to the vaporisable substance 23, to heat the vaporisable substance 23 and produce a vapour. The vaporisation of the vaporisable substance 23 is facilitated by the addition of air from the surrounding environment through the air inlet 25. The vapour generated by heating the vaporisable substance 23 then exits the heating compartment 21 through the air outlet 26 and may for example be inhaled by a user of the device. The flow of air through the heating compartment 21, i.e. from the air inlet 25 though the compartment 21 and out of the air outlet 26, can be aided by negative pressure created by a user drawing air from the outlet 26 side of the device 20.

[0064] When the device 20 is used for generating vapour to be inhaled, a mouthpiece 27 may also be installed on the device, in communication with the air outlet 26. The mouthpiece 27 provides the ability for a user to easily draw the generated vapour from the device 20.

[0065] FIG. 6 schematically illustrates how the vapour generating device 20 of FIGS. 4 and 5 can be operated to charge the rechargeable power source 13 and to inductively heat a susceptor 24. An external induction device 30 comprising an external coil 32 surrounds the perimeter of the induction heating assembly 10 such that the central axes of the heating coil 12 and the external coil 32 are substantially overlapping. In this example, the external induction device 30 has two open ends, through which the induction heating assembly 10 may be inserted. There may be means for fixing the position of the external coil 32 in relation to the induction coil 12, such as a snap-fit mechanism. This allows the vapour generating device 20 to be operated to heat a susceptor 24 and charge the rechargeable power source 13 at the same time.

[0066] As will be appreciated from the above, the present invention, by avoiding the need for one induction system for heating and another separate induction system for charging, enables the provision of a vapour generating device which is inexpensive, compact, and suitable for portable handheld use. An electronic vapour generating device with a safe and efficient charging mechanism, and a lower component count to reduce size, weight and manufacture cost, is achieved by the invention and yet still enables both the heating and charging functionalities of such a vapour generating device.