Electromagnetic heating device and aerosol generating device

Abstract

The present invention discloses an electromagnetic heating device for use in an aerosol-generating device, comprising: a conductive coil; an inductive heating element, the inductive heating element being provided with a receiving cavity for accommodating an aerosol-generating substrate; and the inductive heating element extending in a first direction perpendicular to the axial direction of the conductive coil. The electromagnetic heating device, employing the above-described technical solution, achieves high heating efficiency. The present invention also discloses an aerosol-generating device.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic heating, and in particular to an electromagnetic heating device and an aerosol generating device. Background Art

[0002] Electromagnetic heating is increasingly being used in aerosol-generating devices in the new tobacco sector. This is particularly true in the heat-not-burn (HBN) sector. Current HNB smoking devices employ electromagnetic heating devices, which typically wind a conductive coil axially around an induction heating element. This coil is wrapped around the heating element in a manner similar to a cylindrical spring, extending along its length. Summary of the Invention

[0003] The applicant has found that the existing electromagnetic heating device has the problem of low heating efficiency during its application. The applicant has further studied and found that this is because the axial direction of the conductive coil of the electromagnetic heating device in the prior art is consistent with the length direction of the induction heating element. This results in the magnetic lines of force generated by the conductive coil cutting the radial cross-section of the induction heating element during the electromagnetic heating process. Regardless of whether it is the heating needle with inner core heating or the heating tube with outer heating, its cross-sectional area in the accommodating cavity of the aerosol generating device will be limited by the cavity space and cannot be made very large. Since the efficiency of electromagnetic heating is directly proportional to the area that can be cut by the magnetic lines of force, the heating efficiency of electromagnetic heating is low.

[0004] The purpose of the present invention is to solve the problem of low heating efficiency when electromagnetic heating devices are used in the prior art.

[0005] To solve the above technical problems, an embodiment of the present invention discloses an electromagnetic heating device for an aerosol generating device, comprising: a conductive coil; an induction heating element, the induction heating element being provided with a accommodating cavity for accommodating an aerosol generating substrate, the induction heating element extending along a first direction, the first direction being perpendicular to the axial direction of the conductive coil.

[0006] By adopting the above technical solution, the electromagnetic heating device has high heating efficiency when used.

[0007] Optionally, the conductive coil is arranged on the outer wall of the induction heating body.

[0008] Optionally, a thermal insulation sleeve is provided between the conductive coil and the induction heating element.

[0009] Optionally, the outer wall includes at least one plane, and the conductive coil is arranged on the plane of the outer wall.

[0010] Optionally, the conductive coil is wound flatly on the plane of the outer wall.

[0011] Optionally, the outer wall includes at least a pair of parallel planes located on both sides of the axis of the induction heating element, and a conductive coil is respectively provided on the pair of planes.

[0012] Optionally, a gap is provided between the plane and the accommodating cavity to reduce the heat absorption volume.

[0013] Optionally, the induction heating element includes a first induction part and a second induction part, the first induction part and the second induction part are arranged at intervals, and outer walls of the first induction part and the second induction part are both provided with conductive coils.

[0014] Optionally, the first sensing portion and the second sensing portion are spaced apart along the first direction.

[0015] An embodiment of the present invention further discloses an aerosol generating device, comprising any of the aforementioned electromagnetic heating devices, and further comprising: a control circuit electrically connected to the conductive coil; and a power supply electrically connected to the control circuit for supplying power to the conductive coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of an electromagnetic heating device according to an embodiment of the present invention is shown;

[0017] Figure 2 A perspective view showing an electromagnetic heating device according to another embodiment of the present invention;

[0018] Figure 3 A top view of an electromagnetic heating device according to an embodiment of the present invention is shown;

[0019] Figure 4 A schematic structural diagram of an electromagnetic heating device in another embodiment of the present invention is shown;

[0020] Figure 5 A top view of an electromagnetic heating device according to another embodiment of the present invention is shown;

[0021] Figure 6 A schematic structural diagram of an electromagnetic heating device in another embodiment of the present invention is shown;

[0022] Figure 7 A schematic diagram illustrating magnetic flux calculation in one embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0025] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0026] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0027] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0028] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] Reference Figure 1-Figure 3As shown, an embodiment of the present invention provides an electromagnetic heating device 1 for an aerosol generating device (not shown), comprising: a conductive coil 2; an induction heating element 3, the induction heating element 3 is provided with a receiving cavity 31, the receiving cavity 31 is used to receive an aerosol generating substrate (not shown), and the induction heating element 3 is arranged along a first direction ( Figure 1-Figure 2 The first direction extends in the axial direction of the conductive coil 2 ( Figure 1-Figure 2 Y direction) vertical.

[0030] In this embodiment, the conductive coil 2 is powered by an internal or external power source, and when powered on, it generates magnetic lines of force 21 that cut the induction heating element 3. The induction heating element 3 is provided with a receiving cavity 31, which is used to accommodate an aerosol generating matrix. The aerosol generating matrix can be tobacco, tobacco oil, tobacco paste, etc. as needed. The induction heating element 3 cut by the magnetic lines of force 21 generates an induced electromotive force E, forming an eddy current 22. The temperature of the induction heating element 3 rises, thereby heating the aerosol generating matrix in the receiving cavity 31. The induction heating element 3 extends along the first direction ( Figure 1-Figure 2 The first direction is the length direction of the induction heating element 3, and the first direction is parallel to the axial direction of the conductive coil 2 ( Figure 1-Figure 2 (indicates Y direction) vertical, that is Figure 1 The angle A in the figure is 90°. The conductive coil 2 can have various shapes as needed. In one embodiment, refer to Figure 1 As shown, the conductive coil 2 is similar to the cylindrical shape of a cylindrical spring. Figure 2 As shown, the conductive coil 2 may be flat, and the direction perpendicular to the plane where the conductive coil 2 is located, that is, the axial direction of the conductive coil 2 ( Figure 2 Indicates the Y direction). In other embodiments, the conductive coil 2 may also be of other shapes. The so-called first direction being perpendicular to the axial direction of the conductive coil means that as long as the magnetic lines of force 21 generated by the conductive coil 2 after being energized cut the side of the induction heating element 3, it is sufficient. In this embodiment, since the length direction of the induction heating element 3 is perpendicular to the axial direction of the conductive coil 2, the magnetic lines of force 21 generated by the conductive coil 2 after being energized cut the side of the induction heating element 3 rather than the cross section. For the electromagnetic heating device 1, in order to better accommodate the aerosol generating matrix, the area of ​​the side of the object forming the accommodating cavity 31 is much larger than the area of ​​the cross section. Refer to Figure 7 As shown, according to Φ = BScosθ, when the magnetic field intensity B is constant, the larger the area Scosθ perpendicular to the magnetic field, the larger the corresponding magnetic flux Φ. Consequently, the larger the magnetic flux change ΔΦ that can be achieved during variable frequency power output, the larger the eddy current 22 generated by the induced electromotive force E, the faster the temperature rise of the induction heating element 3, and the higher the heating efficiency. Preferably, the induction heating element 3 is made of a material with high magnetic permeability, such as nickel, iron, alloy steel, or manganese, to further improve the heating efficiency.

[0031] By adopting the above technical solution, the electromagnetic heating device 1 disclosed in this embodiment has high heating efficiency when used. Especially for the aerosol generating device that heats without burning, the preheating time will be greatly shortened by using the electromagnetic heating device 1 disclosed in this embodiment. The conductive coil 2 can be arranged inside the induction heating element 3, that is, inside the accommodating cavity 31, or it can be arranged outside the external induction heating element 3, that is, on the outer wall 32 of the induction heating element 3. This is not limited in this embodiment. In one embodiment, the induction heating element 3 is a hollow cylinder. In another embodiment, the induction heating element 3 is a hollow cuboid. In other embodiments, the induction heating element 3 can also be other shapes, which is not limited in this embodiment.

[0032] Reference Figure 1 As shown, another embodiment of the present invention provides an electromagnetic heating device 1, in which a conductive coil 2 is disposed on the outer wall 32 of an induction heating element 3. In this embodiment, disposing the conductive coil 2 on the outer wall 32 of the induction heating element 3 prevents direct contact between the aerosol-generating substrate and the conductive coil 2. This prevents problems such as residual tobacco leaves or contamination of tobacco oil when the aerosol-generating substrate exits the accommodating chamber 31, facilitating cleaning. Furthermore, the accommodating chamber 31 can accommodate as much aerosol-generating substrate as possible.

[0033] Reference Figure 4 As shown, another embodiment of the present invention provides an electromagnetic heating device 1, in which a thermal insulation sleeve 4 is provided between the conductive coil 2 and the induction heating element 3. In this embodiment, the provision of the thermal insulation sleeve 4 prevents direct contact between the induction heating element 3 and the conductive coil 2, thereby preventing damage to the conductive coil 2 due to the temperature rise of the induction heating element 3 during the induction heating process, thereby improving the reliability of the device. Preferably, the thermal insulation sleeve 4 is made of thermal insulation cotton. Further preferably, the thermal insulation sleeve 4 is made of aerogel felt, which has excellent thermal insulation and low magnetic permeability.

[0034] Reference Figure 1-Figure 2 As shown, another embodiment of the present invention provides an electromagnetic heating device 1, wherein the outer wall 32 includes at least one plane, and the conductive coil 2 is arranged on the plane of the outer wall 32. In the electromagnetic heating device 1 disclosed in this embodiment, the outer wall 32 may include multiple planes, or may include a curved surface plus a flat surface. Arranging the conductive coil 2 on a plane is easier to wind and reliably fix than on a curved surface, thereby improving production efficiency and reliability of the device. The conductive coil 2 can be arranged on one or more planes of the outer wall 32 of the induction heating body 3, and this embodiment does not impose any restrictions on this. Preferably, the accommodating cavity 31 is cylindrical, so that the accommodating cavity 31 is consistent with the shape of a conventional cigarette, which can facilitate the insertion and fixation of the cigarette, and is particularly suitable for aerosol generating devices that heat without burning.

[0035] Reference Figure 2As shown, another embodiment of the present invention provides an electromagnetic heating device 1, in which the conductive coil 2 is wound in a flat shape on the plane of the outer wall 32. The conductive coil 2 disclosed in this embodiment is flat. Preferably, all the wires of a conductive coil 2 are arranged in the plane of an outer wall 32. Compared with the cylindrical spring-type winding, the flat shape can reduce the space required for the conductive coil 2 along the radial direction of the induction heating element 3, reduce the thickness of the conductive coil 2, and thus make the device more miniaturized, which is beneficial to the product design. It is also easier to fix the conductive coil 2 on the outer wall 32 of the induction heating element 3, thereby improving the reliability of the device. Preferably, the area occupied by the conductive coil 2 is the same as the area of ​​the plane in which it is located, that is, the conductive coil 2 covers the entire plane of the outer wall 32 in which it is located, thereby making full use of the side area of ​​the induction heating element 3 and further improving the heating efficiency.

[0036] Reference Figure 1 As shown, another embodiment of the present invention provides an electromagnetic heating device 1, wherein the outer wall 32 includes at least a pair of parallel planes located on both sides of the axis 36 of the induction heating element 3, and a conductive coil 2 is respectively provided on the pair of planes. In this embodiment, the conductive coil 2 is arranged on the plane of the outer wall 32 along the axis 36 of the induction heating element 3, parallel to the plane of the outer wall 32, which can ensure that when the aerosol generating matrix in the accommodating cavity 31 is heated, the matrix in the same radial cross section is heated evenly and more fully. In one embodiment, the outer wall 32 of the induction heating element 3 can include more planes, such as six planes, in which case the outer edge of the radial cross section of the induction heating element 3 is a hexagon. In other embodiments, the outer wall 32 can also include multiple planes of other numbers, or a plane plus a curved surface, and this embodiment is not limited to this.

[0037] Reference Figure 1 and Figure 5 As shown, another embodiment of the present invention provides an electromagnetic heating device 1, in which a gap 35 is provided between the plane and the accommodating cavity 31 to reduce the heat absorption volume. In this embodiment, when the conductive coil 2 is energized, magnetic lines of force 21 are generated to cut the plane in which it is located. At the same time, a gap 35 is provided between the plane and the accommodating cavity 31. The gap 35 can be formed by partially hollowing out the outer wall 32 inward, but the inner wall still forms the accommodating cavity 31 to fully contact the aerosol generating matrix; the gap 35 can also be formed by providing a hollow channel between the outer wall 32 and the accommodating cavity 31; other gap settings that can reduce the heat absorption volume are not excluded. Preferably, the radial width of the plane is not less than the inner diameter of the accommodating cavity 31. The setting of the gap 35 can reduce the volume of the induction heating element 3 and reduce heat loss while ensuring good heat conduction, so that the induction heating element 3 heats up faster and has higher heating efficiency during heating.

[0038] Reference Figure 5-Figure 6As shown, another embodiment of the present invention provides an electromagnetic heating device 1, wherein the induction heating element 3 includes a first induction portion 33 and a second induction portion 34, the first induction portion 33 and the second induction portion 34 are spaced apart, and the outer walls 32 of the first induction portion 33 and the second induction portion 34 are both provided with a conductive coil 2. Figure 5 As shown, the first sensing portion 33 and the second sensing portion 34 can be the left and right parts of the induction heating element 3. Figure 6 The figure shows the upper and lower parts of the induction heating element 3. By dividing the induction heating element 3 into two independent parts, the first induction part 33 and the second induction part 34 can be heated independently of each other during heating, thereby achieving control of heating efficiency. Preferably, the first induction part 33 and the second induction part 34 are mirror images of each other to facilitate manufacturing. Optionally, the gap between the first induction part 33 and the second induction part 34 is filled with PEEK, silicone, etc. to further ensure that the two parts operate independently.

[0039] Optionally, the induction heating element 3 may include three or more induction parts to better achieve segmented heating and uniform heating.

[0040] Reference Figure 6 As shown, another embodiment of the present invention provides an electromagnetic heating device 1, wherein the first induction portion 33 and the second induction portion 34 are arranged along a first direction ( Figure 6 In this embodiment, the first sensing portion 33 and the second sensing portion 34 divide the induction heating element 3 into two upper and lower sections. Each of the first and second sensing portions 33 and 34 is equipped with at least one set of symmetrical conductive coils 2, thereby achieving fully uniform segmented heating of the aerosol-generating substrate. Preferably, the first sensing portion 33 includes two first sensing sub-sections that are mirror images of each other and spaced apart, and the second sensing portion 34 includes two second sensing sub-sections that are mirror images of each other and spaced apart, thereby dividing the induction heating element 3 into four sections, facilitating separate heating control and improving fault tolerance.

[0041] Reference Figure 4 As shown, optionally, a temperature sensor 5 is provided on the induction heating element 3, and the temperature sensor 5 is in contact with the induction heating element 3. By providing the temperature sensor 5, the real-time temperature of the induction heating element 3 can be measured and fed back in a timely manner. For example, the temperature can be transmitted to the control circuit to adjust the output power of the control circuit, thereby achieving closed-loop control of the temperature. Preferably, the temperature sensor 5 is a thermocouple for accurate measurement.

[0042] An embodiment of the present invention further discloses an aerosol generating device, comprising any of the aforementioned electromagnetic heating devices 1 , and further comprising: a control circuit electrically connected to the conductive coil 2 ; and a power supply electrically connected to the control circuit for supplying power to the conductive coil.

[0043] In the aerosol generating device disclosed in this embodiment, the power supply is supplied to one or more conductive coils 2 simultaneously or separately through the control circuit, so that after the conductive coils 2 are energized, the magnetic lines of force 21 cut the side of the induction heating element 3. In this embodiment, since the length direction of the induction heating element 3 is perpendicular to the axial direction of the conductive coil 2, the magnetic lines of force 21 generated after the conductive coils 2 are energized cut the side of the induction heating element 3 rather than the cross section. For the electromagnetic heating device 1, in order to better accommodate the aerosol generating matrix, the area of ​​the side of the object forming the accommodating cavity 31 is much larger than the area of ​​the cross section. Figure 7 As shown, according to Φ=BScosθ, when the magnetic field intensity B is constant, the larger the area Scosθ perpendicular to the magnetic field is, the larger the corresponding magnetic flux Φ will be, and thus the larger the magnetic flux change ΔΦ that can be achieved when the variable frequency power is output will also be, the faster the temperature of the induction heating element 3 will rise, and the higher the heating efficiency will be.

[0044] By adopting the above technical solution, the aerosol generating device disclosed in this embodiment has high heating efficiency. In particular, for a heat-not-burn aerosol generating device, the preheating time will be greatly shortened.

[0045] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An electromagnetic heating device for an aerosol generating device, characterized in that: include: Conductive coil; an induction heating element, the induction heating element being provided with a receiving cavity for receiving an aerosol-generating substrate, the induction heating element extending along a first direction perpendicular to the axial direction of the conductive coil; The conductive coil is arranged on the outer wall of the induction heating body; The outer wall comprises at least a pair of planes located on both sides of the axis of the induction heating element and parallel to each other, and the conductive coils are respectively arranged on the pair of planes; A gap is provided between the plane and the accommodating cavity to reduce the heat absorption volume and reduce heat loss; the radial width of the plane is not less than the inner diameter of the accommodating cavity; The gap is formed by hollowing out an inner portion of the outer wall of the induction heating element, or the gap is formed by providing a hollow channel between the outer wall of the induction heating element and the accommodating cavity.

2. The electromagnetic heating device according to claim 1, characterized in that A heat insulating sleeve is provided between the conductive coil and the induction heating element.

3. The electromagnetic heating device according to claim 1, wherein The conductive coil is wound flatly on the plane of the outer wall.

4. The electromagnetic heating device according to claim 1, wherein The induction heating element includes a first induction part and a second induction part, the first induction part and the second induction part are spaced apart, and outer walls of the first induction part and the second induction part are both provided with conductive coils.

5. The electromagnetic heating device according to claim 4, characterized in that The first sensing portion and the second sensing portion are spaced apart along the first direction.

6. An aerosol generating device, characterized in that: The electromagnetic heating device according to any one of claims 1 to 5, further comprising: a control circuit electrically connected to the conductive coil; A power supply is electrically connected to the control circuit and is used to supply power to the conductive coil.

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