High-current-carrying induction coil and aerosol generating device thereof

Abstract

The utility model discloses a high current-carrying induction coil, which is particularly suitable for a heating non-combustion smoking set, the induction coil is formed by winding a conductive wire rod, when current passes through the conductive wire rod, the induction coil generates a magnetic field, the conductive wire rod comprises a first conductive sheet, a second conductive sheet and an electric connection area, on the cross section perpendicular to the current advancing direction, the first conductive sheet and the second conductive sheet are at least partially overlapped; the overlapping face comprises an insulation area, the first conductive sheet and the second conductive sheet are insulated from each other in the insulation area, and the first conductive sheet and the second conductive sheet are electrically connected with each other in the electric connection area. The high-current-carrying induction coil provided by the utility model can effectively utilize the power-on sectional area, is less influenced by the skin effect, and has the advantages of smaller relative volume, thinner thickness, easier production and winding, lower cost and the like.

Description

Technical Field

[0001] The utility model relates to the field of novel heat-not-burn smoking articles, in particular to an induction coil, a manufacturing method thereof and an aerosol generating device. Background Art

[0002] In the prior art, the induction coil of the heat-not-burn smoking device is usually made of a multi-strand enameled wire composed of round thin wires, such as Figure 1 As shown. The utilization rate of the energized cross-section of the induction coil is not ideal. There are two main reasons. First, due to the skin effect, the current can be considered to flow on the surface of the wire, which is equivalent to comparing the circumference of the two figures. The circle is the geometric figure with the largest area under the same circumference. Therefore, the efficiency of the circular cross-section wire is not high because the internal area is not used. Second, even if the circular wires are closely arranged to form multiple strands of enameled wire, there must be cavities between the circles. This part of the cavity occupies the area, but it is not energized. This is also the main reason why the entire multi-strand enameled wire needs a larger total cross-sectional diameter under the same energized cross-section. The diameter of a single thin wire of a multi-strand enameled copper wire is generally 0.05mm~0.1mm. It needs to be determined according to the frequency of the working environment.

[0003] The method of determination is to calculate the skin depth. According to the theory of electromagnetic induction, in high-frequency circuits, the current mainly flows on the surface of the conductor. The further into the conductor, the smaller the current. The skin depth is used to describe this phenomenon. The calculation formula of skin depth is:

[0004]

[0005] Where f is the operating frequency

[0006] For copper conductor, magnetic permeability μ=4π×10 -7 H / m;

[0007] Conductivity σ=57142857S / m;

[0008] After being brought into the calculation, it is simplified to

[0009]

[0010] Assuming f=100kHz, δ≈0.2mm; assuming f=1MHz, δ≈0.02mm.

[0011] Generally speaking, the diameter of the copper wire needs to be less than 2 times the skin depth (so that most of the cross-sectional area of ​​the copper wire can pass a large current). The operating frequency of general electromagnetic induction equipment is at the hundreds of k level, so it is acceptable to choose a 0.1mm copper wire.

[0012] However, according to electrical engineering experience, the safe current carrying capacity of copper wire is about 5A / mm 2 If the current carrying capacity exceeds this value, the coil will heat up seriously.

[0013] The current carried by the coil of the electromagnetic heating device is usually between 10A and 20A. Taking the middle value of 15A for estimation, 3mm is required. 2 The wire cross section must be small enough to prevent the coil wire from heating up. For a multi-strand enameled wire composed of round thin wires with a diameter of 0.1mm, about 400 strands are needed to achieve this cross-sectional area. According to market products, the total outer diameter of the composite multi-strand enameled wire is about 2.8mm, which is equivalent to reserving 5.6mm of space on both sides outside the bracket to place the coil, which is not conducive to the miniaturization of electromagnetic heating equipment products.

[0014] Generally, about 100 strands of enameled wire are selected as coil winding wire. The total outer diameter after compounding is 1.35mm, but its cross-sectional area is only 0.784mm. 2 , the safe current carrying capacity is only 3.92A, which is why the coils on current electromagnetic heating devices heat up severely and consume a lot of energy.

[0015] Although some coil solutions have been proposed for large-scale engineering equipment, these coils are bulky and expensive and are not suitable for handheld electronic heating devices.

[0016] This patent application is mainly aimed at the large heat generated by the coil in the current electromagnetic device, which causes the shell temperature to rise and energy waste. The reason is that the cross-sectional area of ​​the multi-strand wire currently used is small (because of the volume limitation of the device, very thick multi-strand wire cannot be selected).

[0017] Therefore, in order to optimize coil heating and improve energy efficiency, it is necessary to develop an improved induction heating coil. Utility Model Content

[0018] The utility model aims to provide an improved induction heating coil in order to optimize coil heating and improve energy efficiency.

[0019] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0020] A high current induction coil, the induction coil is wound by a conductive wire, when current passes through the conductive wire, the induction coil generates a magnetic field, the conductive wire comprises a first conductive sheet, a second conductive sheet and an electrical connection area, in a cross section perpendicular to the direction of current travel, the first conductive sheet and the second conductive sheet have at least a portion of overlapping surfaces; the overlapping surface comprises an insulating area, the first conductive sheet and the second conductive sheet are insulated from each other in the insulating area, and the first conductive sheet and the second conductive sheet are electrically connected to each other in the electrical connection area.

[0021] Further, in a cross section perpendicular to the direction of current travel, a height of the insulating region is greater than a height of the electrical connection region.

[0022] Furthermore, the conductive wire is composed of a multilayer conductive sheet formed by folding an initial sheet, the conductive wire includes the first conductive sheet and the second conductive sheet, the initial sheet is a conductive material whose surface is insulated, the initial sheet is folded to form the overlapping surface and the crease, the insulating area is composed of at least a portion of the surface that has been insulated, and the electrical connection area is composed of at least a portion of the crease.

[0023] Furthermore, the conductive wire is formed by folding the initial sheet material multiple times.

[0024] Furthermore, the conductive wire also includes at least a third conductive sheet, the first conductive sheet, the second conductive sheet and the third conductive sheet are stacked in sequence, the fold includes the first fold between the first conductive sheet and the first conductive sheet, the second fold between the second conductive sheet and the third conductive sheet, and the third conductive sheet in sequence, and the first fold and the second fold are parallel to each other.

[0025] Further, in a cross section perpendicular to the current traveling direction, the first conductive sheet, the second conductive sheet and the third conductive sheet completely overlap.

[0026] Furthermore, the conductive wire also includes at least a fourth conductive sheet, and the first conductive sheet, the second conductive sheet, the third conductive sheet and the fourth conductive sheet are stacked in sequence, and a third fold is formed between the third conductive sheet and the fourth conductive sheet, so that the first fold and the third fold are parallel and arranged in a stepped manner.

[0027] Furthermore, in a cross section perpendicular to the direction of current travel, the height a1 of the first conductive sheet, the height a2 of the second conductive sheet, the height a3 of the third conductive sheet and the height a4 of the fourth conductive sheet satisfy the following condition: a1=a3>a2=a4, wherein the height difference between the first fold and the third fold is c.

[0028] Furthermore, the conductive wire includes N conductive sheets, wherein n is an integer greater than or equal to 3; the fold includes an N-1th conductive sheet and an N-1th conductive sheet between the N-1th conductive sheet, wherein N is an integer less than or equal to n; the first conductive sheet to the nth conductive sheet are staggered and superimposed in sequence, so that at least one of the folds on both sides of the conductive wire is arranged in a fish scale shape in sequence.

[0029] Furthermore, the conductive wire is formed by folding the initial sheet material multiple times, and then cutting and folding.

[0030] Furthermore, the cutting is zigzag cutting.

[0031] Furthermore, the conductive wire is composed of conductive sheets that are cut from initial sheets and staggered in the same direction to form a stepped structure. The conductive sheets include the first conductive sheet and the second conductive sheet. The initial sheets are conductive materials with at least a portion of their surfaces insulated. The surfaces of the first conductive sheet and the second conductive sheet include non-insulating areas. The non-insulating areas between the first conductive sheet and the second conductive sheet overlap, and the non-insulating areas form the electrical connection area.

[0032] Furthermore, the non-insulating region is at most 20% of the overlapping area between the first conductive sheet and the second conductive sheet.

[0033] Furthermore, the conductive wire also includes at least a third conductive sheet and a fourth conductive sheet, the first conductive sheet, the second conductive sheet, the third conductive sheet and the fourth conductive sheet are stacked in sequence, and the first conductive sheet, the second conductive sheet, the third conductive sheet and the fourth conductive sheet are parallel to each other.

[0034] Further, the thickness of the first conductive sheet is equal to or different from the thickness of the second conductive sheet.

[0035] Further, in a cross section perpendicular to the current traveling direction, a height of the first conductive sheet is equal to a height of the second conductive sheet.

[0036] Further, in a cross section perpendicular to the current traveling direction, the first conductive sheet and the second conductive sheet completely or incompletely overlap.

[0037] Furthermore, in a cross section perpendicular to the direction of travel of the current, the induction coil includes a bent portion, and the bent portion is composed of one or more layers of bent conductive sheets.

[0038] Furthermore, the bent conductive sheet includes a first portion and a second portion, the first portion is parallel to the coil winding axis, and the second portion is arranged at an angle to the coil winding axis.

[0039] Furthermore, in a cross section perpendicular to the direction of current travel, the induction coil also includes an inclined portion, which is composed of one or more layers of inclined conductive sheets, and the inclined conductive sheets are arranged at an angle to the coil winding axis, and the second part of the bent portion is arranged at an angle to the coil winding axis.

[0040] An induction heating aerosol generating device, which can heat an aerosol generating product by induction heating to generate an aerosol for a user to inhale, comprises: a shell, which defines a heating chamber for receiving at least a portion of the aerosol generating product; an inductor, which comprises any one of the induction coils described above; the induction coil is fixed on a coil support; a power supply, which supplies power to a main control circuit; the main control circuit is connected to the induction coil and is configured to provide a high-frequency current to the induction coil, and when in use, the induction coil generates a fluctuating electromagnetic field to heat a heat-sensitive heating body in thermal contact with the aerosol generating product and thereby heat the aerosol generating substrate of the aerosol generating product.

[0041] Furthermore, when the operating frequency of the main control circuit is less than or equal to 100k, the thickness of the first conductive sheet and the second conductive sheet is less than or equal to 0.1mm and greater than 0.01mm.

[0042] Furthermore, when the operating frequency of the main control circuit is greater than 100k, the thickness of the first conductive sheet and the second conductive sheet is less than or equal to 0.01mm.

[0043] The induction coil disclosed in this patent can effectively utilize the cross-sectional area of ​​the current carrying area, and is less affected by the skin effect. It can effectively increase the safe current carrying capacity of the coil wire and effectively improve the coil heating when the electromagnetic induction device is working. The induction coil disclosed in this patent has a smaller relative volume, thinner thickness, easier production and winding, and is cheaper than other existing solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above technical content of the utility model and the following specific implementation methods will be better understood when read in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only examples of the technical solutions claimed for protection. In the accompanying drawings, the same reference numerals represent the same or similar elements.

[0045] Figure 1 is a cross-sectional view of a multi-strand enameled wire coil in the prior art;

[0046] Figure 2 is a cross-sectional view of the induction coil in the first embodiment of the utility model;

[0047] Figure 3 It is a schematic diagram of a method for manufacturing an induction coil in the first embodiment of the utility model;

[0048] Figure 4 is a cross-sectional view of the induction coil in the second embodiment of the utility model;

[0049] Figure 5 This is a schematic diagram of the first step of the method for manufacturing the induction coil in the second embodiment of the utility model;

[0050] Figure 6 It is a schematic diagram of the second step of the manufacturing method of the induction coil in the second embodiment of the utility model;

[0051] Figure 7 It is a three-dimensional schematic diagram of the second step of the manufacturing method of the induction coil in the second embodiment of the utility model;

[0052] Figure 8 It is a schematic diagram of the third step of the manufacturing method of the induction coil in the second embodiment of the utility model;

[0053] Fig. 9 is a side view of the induction coil in the second embodiment of the utility model;

[0054] Fig.10 is a three-dimensional diagram of the induction coil in the second embodiment of the utility model;

[0055] Fig.11 It is a cross-sectional schematic diagram of the induction coil in the second embodiment of the utility model when it is close to the coil support;

[0056] Fig.12 yes Fig.11 A partial cross-sectional schematic diagram of the induction coil;

[0057] Fig.13 is a cross-sectional view of the induction coil in the third embodiment of the utility model;

[0058] Fig.14 It is a cross-sectional schematic diagram of the induction coil in the third embodiment of the utility model when it is close to the coil support;

[0059] Fig.15 This is a schematic diagram of the first step of the method for manufacturing an induction coil in the fourth embodiment of the utility model;

[0060] Fig.16 It is a three-dimensional schematic diagram of the second step of the manufacturing method of the induction coil in the fourth embodiment of the utility model;

[0061] Fig.17 It is a schematic diagram of the fifth step of the method for manufacturing the induction coil in the fourth embodiment of the utility model;

[0062] Fig.18 It is a schematic diagram of the sixth step of the method for manufacturing the induction coil in the fourth embodiment of the utility model;

[0063] Fig.19 It is a schematic diagram of the seventh step of the method for manufacturing the induction coil in the fourth embodiment of the utility model;

[0064] Fig. 20 It is a cross-sectional view of an electromagnetic heating assembly in one embodiment of the utility model;

[0065] Fig.21 It is a cross-sectional view of an electromagnetic heating assembly in one embodiment of the utility model;

[0066] Fig. 22 This is a top view of an electromagnetic heating assembly in one embodiment of the utility model;

[0067] Fig.23 This is a schematic diagram of a heating chamber in one embodiment of the utility model;

[0068] Fig.24 This is a cross-sectional view of an electromagnetic heating assembly in use in one embodiment of the utility model;

[0069] The reference numerals are described as follows:

[0070] Initial sheets: 1, 2, 4

[0071] First conductive sheet: 101, 201, 301, 401

[0072] Second conductive sheet: 102, 202, 302, 402

[0073] The third conductive sheet: 103, 203, 403

[0074] Fourth conductive sheet: 204

[0075] First electrical connection area: 10a, 20a, 30a

[0076] Second electrical connection area: 10b, 20b

[0077] Third electrical connection area: 20c

[0078] First electrical insulation area: 15a, 35a

[0079] Second electrical insulation area: 15b, 25b

[0080] Induction coil: 511, 521

[0081] Coil support: 512, 522

[0082] Feel the heat: 513, 523

[0083] Main control circuit: 514, 524

[0084] Aerosol-generating products: 515, 525 DETAILED DESCRIPTION

[0085] The detailed features and advantages of the present invention are described below in the specific implementation mode, and the content is sufficient to enable those skilled in the art to understand the technical content of the present invention and implement it accordingly. According to this specification, claims and drawings, those skilled in the art can easily understand the relevant purposes and advantages of the present invention.

[0086] 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 and explained in the subsequent drawings.

[0087] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product is usually placed when used. They are only for the convenience of describing the utility model 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, and therefore cannot be understood as a limitation on this patent.

[0088] In the following, in order to better explain the three-dimensional parameters of the product, the coordinate axes including the X-axis, Y-axis and Z-axis are defined, and the specific reference can be made to the symbols in the attached drawings. The term "height" refers to the length of the product on the Y-axis, the term "thickness" refers to the length of the product on the X-axis, and the term "width" refers to the length of the product on the Z-axis.

[0089] Hereinafter, the term "vertical direction" refers to the axial direction when the coil is wound.

[0090] In order to make the purpose, technical solutions and advantages of this patent clearer, the implementation method of this patent will be further described in detail below in conjunction with the accompanying drawings.

[0091] Figure 2and Figure 3 This is the first embodiment of the utility model. Figure 2 The basic form of the conductive wire cross section (perpendicular to the direction of current flow) of the induction coil is shown in Figure 1. Figure 3 As shown, the conductive wire is formed by folding a rectangular initial sheet 1 for multiple times: step 1, insulating both sides of an initial sheet 1, the initial sheet is a flexible conductive material, preferably, the initial sheet 1 is rectangular, and the flexible conductive material is a uniform flexible conductive material; step 2, folding the initial sheet back and forth n-1 times, the height is a, n is an integer greater than 1; step 3, fixing the overlapping part of the initial sheet; step 4, insulating the initial sheet as a whole to form a conductive wire; step 5, winding the conductive wire into an induction coil along the current direction.

[0092] Therefore, from the cross section of the conductive wire, the first conductive sheet 101, the second conductive sheet 102, the third conductive sheet 103 and other n conductive sheets are completely overlapped, and their heights are all a. The fold between the first conductive sheet 101 and the second conductive sheet 102 constitutes the first electrical connection area 10a, and the first electrical connection area 10a is composed of the fold formed by the folding of the base sheet. The conductive wire includes n layers of conductive sheets. The thickness of the conductive sheet is s, and the thickness of the conductive wire is b, that is, b=n*s.

[0093] Taking the induction coil passing through a safe current of 15A as an example, assuming that the folding height (i.e., the step length of the step) is a=1.7mm, because each layer is in close contact, its conductive cross-sectional area can be estimated by the rectangular formula. In order to ensure that the induction coil is less affected by the skin effect when passing through the current, at the hundred k level of the common working frequency of the electromagnetic induction device, a conductive sheet with a thickness of s=0.1mm can be used. It can be calculated that b≈1.8mm at this time, and this thickness is much smaller than the 2.8mm of the 400-strand multi-strand enameled wire composed of round fine wires, and is relatively close to the diameter of 1.35mm of the 100-strand multi-strand enameled wire composed of round fine wires. However, the safe current of the induction coil in this embodiment reaches 15A, which is much better than the 3.92A of the 100-strand multi-strand enameled wire composed of round fine wires. At this time, the heating of the induction coil will be greatly improved.

[0094] In another embodiment, the height of the first conductive sheet is a, and the height of the second conductive sheet is a'. a and a' are not necessarily equal. The thickness of the conductive sheet is s. The thickness of the conductive wire is b, that is, b = n*s. The induction coil can flexibly adjust the values ​​of a and b according to the actual design, as long as the cross-sectional area of ​​the current meets the requirements, which is more flexible than round multi-strand enameled wire.

[0095] When the conductive wire in the first embodiment is wound into a coil, it is necessary to ensure that each layer is not twisted during the coil winding, either to ensure that the distances from the points on the nth layer and the first layer to the winding axis are equal, or the distance between the nth layer and the winding axis needs to be increased by a length of n*s compared to the first layer, that is, the outer layer needs to be longer than the inner layer. If the conductive wire is first bonded and then wound in a flat state, the lengths of the layers are the same and the layers cannot slide relative to each other, which will inevitably cause twisting during the winding process. If the length is calculated layer by layer and then wound to ensure that no twisting occurs, the manufacturing process is too cumbersome. Therefore, in order to improve the practical application of the induction coil in the first embodiment, it is necessary to improve the folded induction coil in the first embodiment.

[0096] Figures 4 to 12 This is the second embodiment of the present utility model. Figure 4 The basic form of the conductive wire cross section (perpendicular to the direction of current flow) of the induction coil is shown in Figure 1. Figure 5-7 As shown, the manufacturing method of the induction coil in the second embodiment includes: step 1, insulating both sides of an initial sheet 2, the initial sheet is a flexible conductive material, preferably, the initial sheet 2 is rectangular, and the flexible conductive material is a uniform flexible conductive material; step 2, folding the initial sheet 2 back and forth n-1 times, the height is a, n is an integer greater than 1, but the difference from the first embodiment is that the next folding steps a certain distance in the same direction (preferably, the stepping distance is the same each time, set to c); step 3, winding the conductive wire to form a certain angle with the axial direction of the coil to form an induction coil, the axial height of the induction coil is L; step 4, fixing the overlapping part of the initial sheet; step 5, pressing and fixing the initial sheet as a whole and insulating it.

[0097] Figure 4 The basic form of the cross section of the folded conductive wire in the second embodiment is shown. The first conductive sheet 201, the second conductive sheet 202, the third conductive sheet 203 and the fourth conductive sheet 204 do not completely overlap. The folds of the first conductive sheet 201 and the second conductive sheet 202 (the first electrical connection area 20a) and the folds of the third conductive sheet 203 and the fourth conductive sheet 204 (the third electrical connection area 20c) are staggered in the height direction by a certain step distance c, and the folds on the other side (i.e. the folded side) (such as the second electrical connection area 20b) are also staggered by this step distance c. The folds on both sides of the conductive wire are arranged in fish scales in sequence. The conductive wire includes n layers of conductive sheets. The cross-sectional area of ​​the induction coil is approximately a parallelogram area (a1=a2=a3=a4=a5=a), which is a*n*s.

[0098] Figure 8-10 The process of winding the conductive wire in the second embodiment into an induction coil is shown as follows: Figure 8As shown, the conductive wire is tilted relative to the Y axis and then wound into Fig. 9 and Fig.10 The spiral shape shown.

[0099] like Fig.11 A cross-sectional schematic diagram is shown when the induction coil is pressed against the coil support (12, 22) after winding. In the induction coil in the second embodiment, the winding radius of the induction coil (i.e., the distance between the winding axis and the inner wall of the coil) is r, and the distance between any point in each layer of the induction coil and the winding axis is between r and r+ε (the thickness of the coil support is negligible), and ε is the maximum thickness of the induction coil after winding. Although the basic thickness of the conductive wire is b, when the induction coil is wound, the induction coil will be pressed against the coil support (12, 22) due to compression. Preferably, the induction coil includes a bent portion, such as Fig.11 The bent portion shown is composed of a bent conductive sheet, which can match the induction coil with the coil bracket to reduce the radial size of the induction coil; further, a portion of the bent conductive sheet is parallel to the coil winding axis and the other portion is arranged at a certain angle α to the coil winding axis.

[0100] Furthermore, after the stacking of the induction coil reaches a certain thickness, the induction coil can be arranged at a certain angle to the winding axis starting from the n'th layer of conductive sheet (from the inner circle to the outer circle), and the thickness of the induction coil is no longer increased. That is, the induction coil may include an inclined portion, and the inclined portion is composed of an inclined conductive sheet; preferably, the inclined conductive sheet is arranged at a certain angle α to the winding axis. ε is related to the conductive sheet thickness s, the step distance c, the conductive sheet height a and the inclined angle α of the inclined portion. The specific calculation method of ε is shown below.

[0101] Fig.12 Assume that a = 2 mm, c = 0.5 mm, and s = 0.05 mm for its local cross section. According to the following formula:

[0102]

[0103]

[0104] It can be calculated that ε≈0.4mm, n'=4, that is, no matter how many layers of the induction coil n there are in this scheme, its deformation is the same as that of a 4-layer fully overlapping conductive sheet coil. It can be considered that the distances between each point of each layer and the winding axis are basically equal. Even if the distances are not equal, the distortion caused is very small compared to the induction coil disclosed in the first embodiment, and the limitation of the fold becomes less obvious. Therefore, the step-by-step overlapping conductive sheet can be wound more docilely and easily than the fully overlapping conductive sheet. Furthermore, the corresponding parameters can be adjusted to adapt to the conditions of various coils. For example, adjust the step distance c=1mm, and select a thinner sheet, that is, s=0.02mm. At this time, ε≈0.1mm, n'=2, and the induction coil can reach the distortion level of a 2-layer fully overlapping sheet coil. In this scheme, the induction coil can be folded with n layers of sheets exceeding n' layers to increase the overcurrent level, where n>>>n'.

[0105] Figure 13-14 The basic form of the cross section of the conductive wire of the induction coil in the third embodiment is shown. The overall structure of the third embodiment is similar to that of the second embodiment, but the manufacturing method is different, as follows: Step 1, prepare an initial sheet, the initial sheet is a flexible conductive material whose surface has not been insulated, preferably, the initial sheet is rectangular, and the flexible conductive material is a uniform flexible conductive material; Step 2, cut the initial sheet into n conductive sheets, n is an integer greater than or equal to 1, preferably, the heights of the n conductive sheets are equal; Step 3, stagger the n conductive sheets in the same direction to form a stepped structure; Step 4, partially insulate the overlapping parts of adjacent sheets 301 and 302, for example, by bonding them with insulating glue to form an insulating area 35a, and retain a non-insulated electrical connection area 30a of up to 20% of the overlapping area, and the non-insulated area can be reinforced by welding to form a structure such as Fig.13 The cross section shown; step 5, further fix the overlapping part of the conductive sheet; step 6, press and fix the initial sheet as a whole and insulate it; step 7, wind the conductive wire perpendicular to the axial direction of the coil into an induction coil, which can form a Fig.14 Preferably, for steps 2 and 3, the initial sheet can be folded back and forth n times, each folding stepping a certain distance in the same direction (preferably, the stepping distance each time is the same, set to c), and then the initial sheet is cut along the crease to obtain a conductive sheet with a stepped structure.

[0106] The induction coil winding radius (i.e., the distance between the winding axis and the inner wall of the coil) is r, and the distance between any point in each layer of the induction coil and the winding axis is between r and r+ε (the thickness of the coil support is negligible), and ε is the maximum thickness of the induction coil after winding. Although the basic thickness of the conductive wire is b, when the induction coil is wound, the induction coil will be pressed against the coil support (12, 22) due to extrusion. Preferably, the induction coil includes a bent portion, such as Fig.14 The bent portion is composed of a bent conductive sheet, which can match the induction coil with the coil support to reduce the radial size of the induction coil; further, a portion of the bent conductive sheet is parallel to the coil winding axis and another portion is arranged at a certain angle α to the coil winding axis.

[0107] Further, after the stacking of the induction coil reaches a certain thickness, the induction coil can be arranged at a certain angle to the winding axis starting from the n'th layer of conductive sheet (from the inner circle to the outer circle), and the thickness of the induction coil is no longer increased, that is, the induction coil includes an inclined portion, and the inclined portion is composed of an inclined conductive sheet; preferably, the inclined conductive sheet is arranged at a certain angle α to the winding axis. The calculation method of ε is the same as that in the second embodiment.

[0108] Figures 15 to 18 The induction coil in the fourth embodiment has the same cross-section of the conductive wire as the induction coil in the first embodiment, but the coil structure can be directly formed by cutting and folding in different ways. The conductive wire 4 is formed by a rectangular initial sheet that is folded multiple times and then cut and folded in a zigzag shape: step 1, insulating both sides of an initial sheet 4, the initial sheet is a flexible conductive material, preferably, the initial sheet 4 is rectangular, and the flexible conductive material is a uniform flexible conductive material; step 2, folding the initial sheet 4 in half n times, with a height of a, Fig.16 and Fig.17 Taking the four-fold conductive wire as an example (i.e., n=4), the conductive sheets are marked as 4A, 4B, 4C, and 4D in sequence; Step 3, the overlapping parts of the initial sheets are fixed, and 4A, 4B, 4C, and 4D can be formed into a whole by bonding or welding, or semi-fixed by embossing; Step 4, the sheets are pressed and fixed as a whole and insulated; Step 5, refer to Fig.18 The folded sheet is cut alternately in a zigzag pattern on the upper and lower sides. The initial sheet includes multiple rectangular parts. Fig.18 Taking the 4D facing upward and 5 cuttings as an example, the conductive sheet is cut into 4D1, 4D2...4D6 connected alternately at the head and tail; step 6, the first rectangular part 4D1 remains unchanged, and each of the rectangular parts is folded 180° in sequence on the basis of the previous rectangular part. For example, after 4D2 is folded, 4A2 faces upward, and finally the conductive sheet is formed as shown in the figure. Fig.19The conductive wire shown in step 7 is wound into an induction coil with a polygonal cross section (taking a quadrilateral as an example). When winding the coil, the protruding corners can be tightly fixed, such as being stuck in the coil bracket or being wound and folded, and finally forming a coil as shown in FIG. Fig.19 The induction coil is shown.

[0109] In the utility model, the induction coil is wound by a conductive wire. When current passes through the conductive wire, the induction coil generates a magnetic field. The conductive wire is composed of multiple layers of conductive sheets. The conductive sheet is composed of a flexible conductive material with insulating materials attached to both sides, such as metal, graphite, semiconductor, conductive rubber. Preferably, the material of the conductive sheet is metal. Preferably, the material of the conductive sheet is metal foil. The material of the conductive sheet is preferably a metal with high electrical conductivity and low magnetic permeability. Preferably, the material of the conductive sheet is copper or silver.

[0110] Preferably, the insulating material may be insulating paint or insulating film, etc. Accordingly, the insulating material may be sprayed or attached to the conductive sheet, or the substrate may be etched or printed on the insulating material, etc. Preferably, the conductive sheet may be a combination of different insulating materials.

[0111] The coverage area of ​​the insulating material accounts for more than 50% of the surface area of ​​the conductive sheet.

[0112] The thickness of the conductive sheet can be selected according to the operating frequency of the device. If the operating frequency is at the 100k level, a conductive sheet with a thickness of 0.1mm can be selected. If the operating frequency exceeds 100k, a conductive sheet of micrometer level needs to be selected. The thickness of the conductive sheet has a wider range of options compared to the round cross-section wire, which is more conducive to adapting to the requirements of electromagnetic induction equipment.

[0113] like Fig. 20 and Fig.21 As shown, the patent also discloses an electromagnetic heating assembly using the above-mentioned induction coil, including an induction coil (11, 21), a coil support (12, 22), a heating element (13, 23) and a main control circuit (14, 24).

[0114] A power source is connected to the induction coil and is configured to provide a high frequency current to the induction coil. In use, the induction coil generates a fluctuating electromagnetic field to heat the heat susceptor in thermal contact with the aerosol generating article and thereby heat the aerosol generating substrate of the aerosol generating article.

[0115] The electromagnetic heating component can be of external heating type or internal heating type.

[0116] Preferably, the electromagnetic heating assembly further comprises an extractor 26, which is movably mounted inside the bracket and is used to contain the aerosol generating product and to take the aerosol generating product out.

[0117] The induction coil is connected to the main control circuit by welding or plugging. Preferably, the electromagnetic heating assembly also includes a temperature sensor for feedback sensing the temperature of the heating element.

[0118] The induction coil and the heating element are fixedly mounted on the bracket. When there is no extractor, the internal space of the bracket forms a heating chamber; when there is an extractor, the internal space of the extractor forms the heating chamber. The heating chamber is used to accommodate the aerosol generating product and heat it.

[0119] like Fig. 22 As shown, the cross section of the heating chamber is a non-circular figure surrounded by one or more tangent curves but with an inscribed circle. The inscribed circle is approximately equal to the cross-sectional size of the aerosol generating article, and for any point on the curve, a tangent line is drawn through the point, and all points of the curve except the point are on the same side of the tangent line as the center of the circle. The space between the interface of the heating chamber and the inscribed circle forms an air path channel. Preferably, the heating chamber and the aerosol generating article form multiple air paths.

[0120] Fig.23 The method of designing and forming the cross section of the heating chamber in one embodiment is shown: the outer contour of the aerosol generating matrix is ​​the inscribed circle of the heating chamber. The number of air paths is X, and a corresponding circumscribed regular X-gon is made according to the selected number of air paths (X=4 in this embodiment). After determining the maximum width of the air path, two arcs are made on the midpoint of the side of the circumscribed regular polygon and the extension line of the center of the circle and the diagonal line to make them tangent. Finally, based on the short-circuit line, the above process is copied to guide the multiple groups of curves to form a closed figure. The shape of the heating chamber constructed by this calculation method is centrally symmetrical and axially symmetrical. In addition, the gap of the air path is regular and controllable, and cross sections with different numbers of divisions can also be selected according to different structural forms.

[0121] like Fig.24 As shown, when inhaling, the air flow flows from the top to the bottom of the bracket through the gap between the above-mentioned heating chamber and the aerosol generating product, flows to the bottom of the aerosol generating product through the ventilation groove reserved at the bottom, and then flows through the aerosol generating product to be inhaled and bring out the aerosol.

[0122] The terms and expressions used here are for description only, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or parts thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, changes and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

[0123] Similarly, it should be pointed out that although the utility model has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the utility model, and various equivalent changes or substitutions can be made without departing from the spirit of the utility model. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the utility model, they will fall within the scope of the claims of the utility model.

Claims

1. A high current induction coil, the induction coil is wound by a conductive wire, when current passes through the conductive wire, the induction coil generates a magnetic field, characterized in that: The conductive wire includes a first conductive sheet, a second conductive sheet and an electrical connection area. In a cross section perpendicular to the direction of current travel, the first conductive sheet and the second conductive sheet have at least a portion of overlapping surfaces; the overlapping surface includes an insulating area, the first conductive sheet and the second conductive sheet are insulated from each other in the insulating area, and the first conductive sheet and the second conductive sheet are electrically connected to each other in the electrical connection area.

2. The induction coil according to claim 1, characterized in that In a cross section perpendicular to the current traveling direction, the height of the insulating region is greater than the height of the electrical connection region.

3. The induction coil according to claim 1, characterized in that: The conductive wire is composed of a multilayer conductive sheet formed by folding an initial sheet, the conductive wire includes the first conductive sheet and the second conductive sheet, the initial sheet is a conductive material with an insulation treatment on the surface, the initial sheet is folded to form the overlapping surface and the fold, the insulating area is composed of at least a portion of the insulation-treated surface, and the electrical connection area is composed of at least a portion of the fold.

4. The induction coil according to claim 3, characterized in that: The conductive wire is formed by folding the initial sheet for multiple times.

5. The induction coil according to claim 3, characterized in that: The conductive wire also includes at least a third conductive sheet, the first conductive sheet, the second conductive sheet and the third conductive sheet are stacked in sequence, the folds include the first fold between the first conductive sheet and the first conductive sheet, and the second fold between the second conductive sheet and the third conductive sheet, and the first fold and the second fold are parallel to each other.

6. The induction coil according to claim 5, characterized in that: In a cross section perpendicular to the current traveling direction, the first conductive sheet, the second conductive sheet, and the third conductive sheet completely overlap.

7. The induction coil according to claim 5, characterized in that: The conductive wire also includes at least a fourth conductive sheet, and the first conductive sheet, the second conductive sheet, the third conductive sheet and the fourth conductive sheet are stacked in sequence in an offset manner, and a third fold is formed between the third conductive sheet and the fourth conductive sheet, so that the first fold and the third fold are parallel and arranged in a stepped manner.

8. The induction coil according to claim 7, characterized in that: In a cross section perpendicular to the current travel direction, the height a1 of the first conductive sheet, the height a2 of the second conductive sheet, the height a3 of the third conductive sheet, and the height a4 of the fourth conductive sheet satisfy the following conditions: a1=a3>a2=a4, The height difference between the first fold and the third fold is c.

9. The induction coil according to claim 3, characterized in that: The conductive wire includes n conductive sheets, wherein n is an integer greater than or equal to 3; the folds include the N-1th conductive sheet and the N-1th conductive sheet between the N-1th conductive sheet, wherein N is an integer less than or equal to n; the first conductive sheet to the nth conductive sheet are staggered and superimposed in sequence, so that at least one of the folds on both sides of the conductive wire is arranged in a fish scale shape in sequence.

10. The induction coil according to claim 3, characterized in that: The conductive wire is formed by folding the initial sheet material multiple times, and then cutting and / or folding.

11. The induction coil according to claim 10, characterized in that: The cutting is zigzag cutting.

12. The induction coil according to claim 1, characterized in that: The conductive wire is formed by cutting the initial sheet and staggering in the same direction to form a conductive sheet with a stepped structure. The conductive sheet includes the first conductive sheet and the second conductive sheet. The initial sheet is a conductive material with at least part of its surface being insulated. The surfaces of the first conductive sheet and the second conductive sheet include non-insulating areas. The non-insulating areas between the first conductive sheet and the second conductive sheet overlap, and the non-insulating areas form the electrical connection area.

13. The induction coil according to claim 12, characterized in that: The non-insulating region is at most 20% of the overlapping area between the first conductive sheet and the second conductive sheet.

14. The induction coil according to claim 13, characterized in that: The conductive wire further includes at least a third conductive sheet and a fourth conductive sheet, the first conductive sheet, the second conductive sheet, the third conductive sheet and the fourth conductive sheet are stacked in sequence, and the first conductive sheet, the second conductive sheet, the third conductive sheet and the fourth conductive sheet are parallel to each other.

15. The induction coil according to claim 1, characterized in that The thickness of the first conductive sheet is equal to or different from the thickness of the second conductive sheet.

16. The induction coil according to claim 1, characterized in that In a cross section perpendicular to the current traveling direction, a height of the first conductive sheet is equal to a height of the second conductive sheet.

17. The induction coil according to claim 1, characterized in that In a cross section perpendicular to the current traveling direction, the first conductive sheet and the second conductive sheet completely or incompletely overlap.

18. The induction coil according to any one of claims 1 to 17, characterized in that: In a cross section perpendicular to the direction of travel of the current, the induction coil includes a bent portion, and the bent portion is composed of one or more layers of bent conductive sheets.

19. The induction coil according to claim 18, characterized in that The bent conductive sheet includes a first portion and a second portion, wherein the first portion is parallel to the coil winding axis, and the second portion is arranged at an angle to the coil winding axis.

20. The induction coil according to claim 18, characterized in that In a cross section perpendicular to the direction of current travel, the induction coil further comprises an inclined portion, which is composed of one or more layers of inclined conductive sheets, the inclined conductive sheets are arranged at an angle to the coil winding axis, and the second portion of the bent portion is arranged at an angle to the coil winding axis.

21. An induction heating aerosol generating device, which can heat an aerosol generating product by induction heating to generate an aerosol for a user to inhale, characterized in that: include: a housing defining a heating chamber for receiving at least a portion of the aerosol-generating article; An inductor comprising the induction coil according to any one of claims 1 to 20; The induction coil is fixed on the coil support; A power supply, which supplies power to the main control circuit; The main control circuit is connected to the induction coil and is configured to provide a high-frequency current to the induction coil. In use, the induction coil generates a fluctuating electromagnetic field to heat a heat-sensitive body in thermal contact with the aerosol-generating article and thereby heat the aerosol-generating substrate of the aerosol-generating article.

22. The induction heating aerosol generating device according to claim 21, characterized in that: When the operating frequency of the main control circuit is less than or equal to 100k, the thickness of the first conductive sheet and the second conductive sheet is less than or equal to 0.1mm and greater than or equal to 0.01mm.

23. The induction heating aerosol generating device according to claim 21, characterized in that: When the operating frequency of the main control circuit is greater than 100k, the thickness of the first conductive sheet and the second conductive sheet is less than or equal to 0.01mm.

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