Heating device and aerosol generating equipment

Abstract

The utility model relates to the technical field of aerosol generation, in particular to a heating device and aerosol generation equipment, the heating device comprises a supporting piece and a heating assembly, the supporting piece is internally provided with a containing channel, and the containing channel is used for containing an aerosol generation base body; at least part of the structure of the heating assembly is inserted into the containing channel. The heating assembly comprises at least two air outlets, a spiral air channel and at least one air inlet, the spiral air channel is communicated with the air inlets and the air outlets, external air can enter the spiral air channel through the air inlets, and the heating assembly can be electrified to generate heat so as to heat the air to form hot air flow; the hot air flows into the aerosol generating substrate through the air outlet and is used for heating the aerosol generating substrate. As the air channel length of the spiral air channel is longer than that of the straight air channel, the heating assembly can sufficiently heat air, the heat utilization rate is increased, and the use taste of a user is improved.

Description

Technical Field

[0001] This application relates to the technical field of aerosol generation, and more specifically, to a heating device and an aerosol production device. Background Art

[0002] An aerosol production device is a device that uses heating to atomize an aerosol generation substrate to produce an aerosol for user use. It includes a heating device and a power supply component. The power supply component can provide the power required for the heating device to operate, and the heating device provides the heat for heating and atomizing the aerosol generation substrate. In order to increase the use efficiency of the heating device and make the heating of the aerosol generation substrate uniform, a central air flow heating method is usually adopted. The specific method is that when the user uses it, external air enters the air flow channel through suction. The heating device can heat the air to form a hot air flow, and the hot air flow flows into the aerosol generation substrate for heating. Most of the air intake methods in the prior art use direct air intake, and the heating path of the air is short, resulting in a lower temperature of the hot air flow, which easily causes insufficient heating of the aerosol generation substrate and thus affects the user's taste. Summary of the Utility Model

[0003] This application provides a heating device and an aerosol production device, which can extend the heating path, avoid insufficient heating of the aerosol generation substrate, and improve the user's taste.

[0004] This application provides a heating device, including:

[0005] A support member having a receiving channel therein for placing an aerosol generation substrate; and

[0006] A heating assembly, at least a part of which is inserted into the receiving channel and inserted into the aerosol generation substrate placed in the receiving channel; the heating assembly includes at least two air outlets, a spiral air duct, and at least one air inlet. The spiral air duct is connected to the air inlet and the air outlets. External air can enter the spiral air duct through the air inlet. The heating assembly can be energized to generate heat to heat the air entering the spiral air duct to form a hot air flow, and the hot air flow flows through the air outlets into the aerosol generation substrate to heat the aerosol generation substrate.

[0007] In one embodiment, the heating assembly includes a heating element, an electromagnetic coil, and a heating body. The heating body is disposed within the heating element, and at least a part of the structure of the heating body abuts against the inner side wall of the heating element to form the spiral air duct between the heating element and the heating body; at least two of the air outlets and at least one of the air inlets are disposed on the heating element; the electromagnetic coil is disposed outside the heating element, and after the electromagnetic coil is energized, a magnetic field is generated to heat the heating body.

[0008] In one embodiment, the heating element includes a base body and at least one spiral portion. At least one of the spiral portions is arranged continuously or at intervals along the axial direction of the base body. The spiral portion abuts against the inner side wall of the heating member, and the spiral air duct is formed between the spiral portion, the base body and the heating member.

[0009] In one embodiment, there are a plurality of the spiral portions, and at least two of the plurality of spiral portions have different pitches.

[0010] In one embodiment, the base body has a first end and a second end along its axial direction. The first end is inserted into the accommodating channel; the pitches of the plurality of spiral portions gradually decrease in the direction from the first end to the second end.

[0011] In one embodiment, at least two of the air outlets are arranged close to the first end, and at least two of the air outlets are arranged axially staggered along the base body; at least one of the air inlets is arranged close to the second end;

[0012] And / or, there are at least two of the air inlets. At least two of the air inlets are arranged on the side wall of the heating element and are close to the second end; at least two of the air inlets are arranged axially staggered along the base body.

[0013] In one embodiment, at least two of the air outlets are arranged close to the first end, and at least two of the air outlets are arranged axially staggered along the base body; at least one of the air inlets is arranged at the end of the second end.

[0014] In one embodiment, the heating device further includes a bracket. The support member is arranged in the bracket to form an air inlet channel between the support member and the bracket. The air inlet channel is communicated with the air inlet; the electromagnetic coil is arranged on the outer side wall of the bracket; an installation hole is further provided on the support member, and the installation hole is communicated with the accommodating channel. The heating member passes through the installation hole and is inserted into the accommodating channel.

[0015] In one embodiment, the heating device further includes a base. The base is arranged in the bracket and is spaced from the support member. The air inlet channel is formed between the base, the support member and the bracket; one end of the heating member is fixedly arranged on the base, and the other end passes through the installation hole and is inserted into the accommodating channel.

[0016] The present application provides an aerosol generating device, which includes an outer housing, a power supply assembly and the heating device as described above. The power supply assembly and the heating device are arranged in the outer housing; the power supply assembly and the heating device are electrically connected to provide the power required for the operation of the heating device.

[0017] According to the heating device in the above embodiment, it includes a support member and a heating assembly. The support member has a receiving channel for placing an aerosol generation matrix. At least part of the structure of the heating assembly is inserted into the receiving channel and inserted into the aerosol generation matrix placed in the receiving channel. The heating assembly includes at least two air outlets, a spiral air duct, and at least one air inlet. And a spiral air duct is provided in the heating assembly, and the spiral air duct is communicated with the air inlet and the air outlet. External air can enter the spiral air duct through the air inlet. The heating assembly can be powered on to generate heat for heating the air to form a hot air flow. The hot air flow flows into the aerosol generation matrix through the air outlet to heat the aerosol generation matrix. Since the air duct length of the spiral air duct is longer than that of the direct air duct, it is equivalent to increasing the contact area between the air and the heating assembly, which is conducive to the heating assembly heating the air more fully, improving the utilization rate of the generated heat, increasing the temperature of the hot air flow, so that the aerosol generation matrix can be heated evenly and sufficiently, thereby improving the user's taste. Description of the Drawings

[0018] Figure 1 It is a structural cross-sectional view of an aerosol generating device in an embodiment;

[0019] Figure 2 It is a structural cross-sectional view of a heating device in an embodiment;

[0020] Figure 3 It is a structural cross-sectional view of the cooperation between a heating element and a heating body in an embodiment;

[0021] Figure 4 It is a structural schematic diagram of a heating body in an embodiment.

[0022] Wherein: 100, outer housing; 110, installation space; 200, heating device; 210, support member; 211, receiving channel; 212, mounting hole; 220, heating assembly; 221, air outlet; 222, air inlet; 223, spiral air duct; 224, heating element; 225, electromagnetic coil; 226, heating body; 2261, matrix; 2262, spiral part; 2263, first end; 2264, second end; 230, bracket; 240, air inlet channel; 250, base; 300, power supply assembly; A, aerosol generation matrix. Detailed Embodiments

[0023] The present application will be further described in detail below in conjunction with specific embodiments and the accompanying drawings. Similar elements in different embodiments are denoted by related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification in order to avoid obscuring the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and general technical knowledge in the art.

[0024] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operation steps involved in each embodiment can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a certain embodiment and do not mean to be an essential composition and / or sequence.

[0025] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0026] The present application provides an aerosol generating device (hereinafter referred to as the generating device), which can be used to heat an aerosol generating substrate A to generate an aerosol that can be used.

[0027] It should be noted that the aerosol referred to in the terms refers to a dispersion of solid particles or liquid particles in a gas. As used herein, "aerosol" generally can be used to refer to a substance that has been vaporized, atomized, in the form of a spray or jet, or otherwise transformed from a solid or liquid form into an inhalable form containing suspended solid or liquid drug particles.

[0028] As used herein, the term "aerosol generating substrate A" refers to any suitable compound or mixture of compounds that facilitates the formation of an aerosol (such as a stable aerosol that is substantially resistant to thermal degradation at the operating temperature of the system) during use. Suitable aerosol generating substrates A are well known in the art and include, but are not limited to: polyols such as triethylene glycol, 1,3-butanediol, and glycerol; esters of polyols such as glycerol mono-, di-, or triacetate; and aliphatic esters of mono-, di-, or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate.

[0029] The aerosol - generating substrate A may include nicotine. The aerosol - generating substrate A may include water. The aerosol - generating substrate A may include glycerol (also known as propanetriol) which has a boiling point higher than that of nicotine. The aerosol - generating substrate A may include propylene glycol. The aerosol - generating substrate A may include plant - based materials. The aerosol - generating substrate A may include a homogeneous plant matrix material. The homogeneous plant matrix material may contain volatile compounds. These compounds may be released from the aerosol - generating substrate A when heated. The aerosol - generating substrate A may be contained in a container to form a columnar structure with a preset length, etc.

[0030] Please refer to Figure 1 , the generating device includes a housing 100, a heating device 200, and a power supply component 300. An installation space 110 is provided inside the housing 100. Both the heating device 200 and the power supply component 300 are arranged in the installation space 110. The power supply component 300 and the heating device 200 are electrically connected to provide the power required for the heating device 200 to operate and control its operation. The housing 100 can be understood as a collection of related components that form the overall outer contour of the generating device. For example, the housing 100 can be assembled by combining one or more components, and corresponding assembly structures are provided inside or on the wall of the housing 100 to assemble other components of the generating device to the housing 100. For example, the PCB control circuit board (not shown in the figure) and the battery (not shown in the figure) in the power supply component 300 can be assembled inside the housing 100, and the operation buttons in the power supply component 300 can be installed on the housing 100 in a way that is exposed outside the housing 100. With the help of the housing 100, users can carry, move, operate, and use the generating device.

[0031] It should be noted that the housing 100 and the power supply component 300 are technologies already disclosed in the prior art and are not the core protected by this application, so no further description will be given here. The heating device 200 protected by this application will be introduced in detail below.

[0032] Please refer to Figures 2 to 4, the heating device 200 includes a support member 210 and a heating assembly 220. The support member 210 has a receiving channel 211 therein for placing the aerosol generation substrate A. At least a part of the heating assembly 220 is inserted into the receiving channel 211 and inserted into the aerosol generation substrate A placed in the receiving channel 211. The heating assembly 220 includes at least two air outlets 221, a spiral air passage 223, and at least one air inlet 222. A spiral air passage 223 is provided in the heating assembly 220. The spiral air passage 223 is communicated with the air inlet 222 and the air outlets 221. External air can enter the spiral air passage 223 through the air inlet 222. The heating assembly 220 can be powered on to generate heat for heating the air to form a hot air flow. The hot air flow flows into the aerosol generation substrate A through the air outlets 221 to heat the aerosol generation substrate A.

[0033] Specifically, when in use, the aerosol generation substrate A is inserted into the support member 210, and at least a part of the heating assembly 220 is arranged inside the aerosol generation substrate A. In particular, at least two air outlets 221 are correspondingly arranged with the matrix section of the aerosol generation substrate A, so that the hot air flow can directly flow to the matrix section to be heated to form aerosol. The air is heated to form a hot air flow when flowing through the entire spiral air passage 223. Since the length of the air passage of the spiral air passage 223 is longer than that of a straight air passage, it is equivalent to increasing the contact area between the air and the heating assembly 220, which is beneficial for the heating assembly 220 to heat the air more fully, improve the utilization rate of the generated heat, and increase the temperature of the hot air flow, so as to facilitate the aerosol generation substrate A to be heated sufficiently and evenly, thereby improving the user's taste during use.

[0034] Please refer to Figure 2 , in one embodiment, the heating assembly 220 includes a heating element 224, an electromagnetic coil 225, and a heating body 226. The heating body 226 is arranged inside the heating element 224. At least a part of the heating body 226 abuts against the inner side wall of the heating element 224 to form a spiral air passage 223 between the heating element 224 and the heating body 226. At least two air outlets 221 and at least one air inlet 222 are arranged on the heating element 224. The electromagnetic coil 225 is arranged outside the heating element 224. After the electromagnetic coil 225 is powered on, an eddy current effect is generated in the heating body 226 placed inside it, which can generate heat. This heat can be transferred to the air flowing into the spiral air passage 223 through the air inlet 222 to form a hot air flow, and the hot air flow flows from the air outlets 221 to the aerosol generation substrate A.

[0035] It should be further noted that the heating element 226 is made of a metal material with a high magnetic permeability, such as cast iron. Since the heating member 224 is disposed between the electromagnetic coil 225 and the heating element 226, the heating member 224 is made of a material with a relatively low magnetic permeability. This material will not generate heat due to the eddy current effect in the magnetic field, and at the same time will not shield the magnetic field, and it has the performance of high temperature resistance, such as ceramic or glass materials. Since the heating element 226 is disposed inside the heating member 224 and the electromagnetic coil 225 is disposed outside the heating member 224, when the electromagnetic coil 225 is energized, the heating element 226 can generate heat, and the air in the spiral air duct 223 defined by the heating element 226 and the heating member 224 can fully contact the heating element 226, effectively improving the temperature of the hot air flow.

[0036] Of course, in other embodiments, the heating assembly may also include a heating member 224 and a heating element 226 disposed inside the heating member 224. The heating element 226 is a heating wire, a heating mesh or a heating tube made of a conductive wire. The heating element 226 directly generates heat after being energized. A spiral air duct 223 is provided inside the heating member 224. For example, the heating member 224 includes an inner tube and an outer tube, and the spiral air duct 223 is disposed between the inner tube and the outer tube. The heating element 226 is also attached to the outer wall of the inner tube or the outer wall of the outer tube.

[0037] In one embodiment, one end of the heating member 224 is a conical structure, and the heating member 224 is a needle-shaped or rod-shaped structure, which can be conveniently inserted into the aerosol generation matrix A, facilitating the fixed installation and disassembly of the aerosol generation matrix A.

[0038] Please refer to Figure 4 , in one embodiment, the heating element 226 is disposed inside the heating member 224 and coaxially arranged, so that the spiral air duct 223 around the heating element 226 is uniform. The heating element 226 includes a base 2261 and at least one spiral portion 2262. The at least one spiral portion 2262 is continuously arranged along the axial direction of the base 2261. The spiral portion 2262 abuts against the inner side wall of the heating member 224, and the spiral air duct 223 is formed between the spiral portion 2262, the base 2261 and the heating member 224. In this embodiment, the heating element 226 can be directly made of a screw with an external thread. The heating member 224 is a needle-shaped or rod-shaped structure with a hollow insertion portion. The spiral air duct 223 is formed by the cooperation of the screw and the heating member 224. The screw and the heating member 224 are convenient to process, easy to implement, and can save production costs.

[0039] Of course, in other embodiments, at least one spiral portion 2262 may also be provided on the inner wall of the heating member 224. The at least one spiral portion 2262 is arranged continuously or at intervals along the axial direction of the heating member 224. The spiral portion 2262 abuts against the outer side wall of the heating element 226, and the spiral air duct 223 is formed between the spiral portion 2262 and the heating element 226. In this embodiment, an internal thread is machined on the inner wall of the heating member 224, and the heating element 226 is in a rod-shaped or bar-shaped structure, and it is easy to form the spiral air duct 223 in cooperation with the heating member 224.

[0040] In another embodiment, the heating element 226 includes a base body 2261 and at least one spiral portion 2262. The at least one spiral portion 2262 is arranged at intervals along the axial direction of the base body 2261. The spiral portion 2262 abuts against the inner side wall of the heating member 224, and the spiral air duct 223 is formed among the spiral portion 2262, the base body 2261 and the heating member 224. The multiple spiral portions 2262 arranged at intervals can also increase the contact area between the air and the heating element 226 and improve the utilization rate of heating heat.

[0041] In one embodiment, there are multiple spiral portions 2262, and the pitches of at least two of the multiple spiral portions 2262 are different. That is, the pitches of the multiple spiral portions 2262 may not be the same, so that the spiral air duct 223 is divided into multiple segments, which is beneficial to extending the airway length of the spiral air duct 223 and further increasing the heating distance and contact area. For example, the pitches of the spiral portions 2262 at both ends are large, and the pitch of the spiral portion 2262 in the middle is small.

[0042] In one embodiment, the spiral directions of at least two of the multiple spiral portions 2262 are different, which is also beneficial to increasing the heating distance and contact area.

[0043] In one embodiment, the base body 2261 has a first end 2263 and a second end 2264 along its axial direction. The first end 2263 is inserted into the accommodation channel 211, so that when the heating member 224 is inserted into the aerosol generating base A, the first end 2263 of the base body 2261 is also located in the aerosol generating base A. The pitches of the multiple spiral portions 2262 gradually decrease along the direction from the first end 2263 to the second end 2264, so that the spiral air duct 223 is divided into multiple segments with different airway lengths. The segment with a small pitch has a large contact area with the air and a long heating distance, which is beneficial to forming a hot air flow with a relatively high temperature. The segment with a large pitch, relatively speaking, has a small contact area with the air and a short heating distance, which is beneficial to forming a hot air flow with a relatively low temperature. Thus, a temperature gradient is formed along the axial direction of the aerosol generating matrix (parallel to the axial directions of the base body 2261 and the heating member 224), which can prevent the aerosol generating base A from generating a burnt smell due to a large high-temperature area and avoid insufficient heating of the aerosol generating base A, effectively improving the user's taste.

[0044] In one embodiment, at least two air outlets 221 are arranged close to the first end 2263, and the at least two air outlets 221 are arranged axially staggered along the base body 2261; at least one air inlet 222 is arranged close to the second end 2264. In this embodiment, if the pitches of the plurality of spiral portions 2262 gradually decrease in the direction from the first end 2263 to the second end 2264, the heating area in the direction close to the air inlet 222 is large and the heat exchange distance is long, while the heating area close to the air outlet 221 is relatively small and the heat exchange distance is relatively short. Since during use, the user sucks at a position close to the first end 2263 and the hot air flow moves from the second end 2264 to the first end 2263, and the temperature gradually increases during the flow process, reducing the heating area at the position close to the first end 2263 can avoid the hot air flow temperature at the air outlet 221 being too high and causing the aerosol generating substrate A to be burnt.

[0045] It should be further noted that the pitch mentioned in this article refers to the distance measured along the spiral direction (the axial direction of the base body 2261) between adjacent threads. The smaller the pitch, the denser the threads, and the larger the area of contact between the air flow and the spiral portion 2262.

[0046] In one embodiment, the length of the heating element 226 is 14 mm, and the spiral portion 2262 has 7 spiral periods. In the limited space of the generating device, this design can not only reduce the occupied volume of the heating element 226, but also effectively improve the heating efficiency.

[0047] It should be understood that in the spiral portion 2262, a basic geometry is one spiral period.

[0048] Furthermore, at least two air outlets 221 are arranged at different positions on the side wall of the heating element 224 and are axially staggered along the base body 2261. Preferably, since the heating element 224 is in a needle-like or rod-like structure and its orthographic projection along the axial direction of the base body 2261 is circular, the orthographic projections of the at least two air outlets 221 along the axial direction of the base body 2261 are uniformly and symmetrically arranged within this circle, which is beneficial to the uniform distribution of the hot air flow and facilitates the uniform heating of the aerosol generating substrate A.

[0049] In one embodiment, there are at least two air inlets 222. The at least two air inlets 222 are arranged on the side wall of the heating element 226 and are close to the second end 2264; the at least two air inlets 222 are axially staggered along the base body 2261. Since the heating element 224 is in a needle-like or rod-like structure and its orthographic projection along the axial direction of the base body 2261 is circular, the orthographic projections of the at least two air inlets 222 along the axial direction of the base body 2261 are uniformly and symmetrically arranged within this circle, which is beneficial to the uniform entry of air and the uniformity of the hot air flow.

[0050] Please refer to Figure 3, In one embodiment, there are two air outlets 221 and also two air inlets 222. The two air outlets 221 and the two air inlets 222 are both arranged on the side wall of the heating element 226. The two air outlets 221 are arranged close to the first end 2263, and the two air inlets 222 are arranged close to the second end 2264. The spiral part 2262 includes protruding parts, and recessed parts are formed between the multiple protruding parts. The air outlets 221 and the air outlets 221 are both correspondingly arranged and communicated with the recessed parts of the spiral part 2262, so that air flow can correspondingly enter from the air inlets 222 or flow out from the air outlets 221.

[0051] In another embodiment, at least two air outlets 221 are arranged close to the first end 2263, and the at least two air outlets 221 are arranged axially staggered along the base body 2261; at least one air inlet 222 is arranged at the end of the second end 2264, that is, the heating element 224 has a structure with one end open or semi-closed and one end closed, and this opening serves as the air inlet 222, and air enters the spiral air duct 223 from the air inlet 222 and is heated to form a hot air flow.

[0052] In one embodiment, the heating device 200 further includes a bracket 230. The support member 210 is arranged inside the bracket 230 to form an air inlet channel 240 between the support member 210 and the bracket 230. The air inlet channel 240 is communicated with the air inlet 222; the electromagnetic coil 225 is arranged on the outer side wall of the bracket 230; an installation hole 212 is further arranged on the support member 210, and the installation hole 212 is communicated with the accommodation channel 211. The heating element 224 passes through the installation hole 212 and is inserted into the accommodation channel 211.

[0053] In one embodiment, the heating device 200 further includes a base 250. The base 250 is arranged inside the bracket 230 and is arranged at an interval from the support member 210. The air inlet channel 240 is formed between the base 250, the support member 210 and the bracket 230; one end of the heating element 224 is fixedly arranged on the base 250, and the other end passes through the installation hole 212 and is inserted into the accommodation channel 211.

[0054] In one embodiment, the base 250 is provided with a plurality of holes, and these holes are communicated with the air flow channel and the air inlet 222. When the heating element 224 is fixed on the base 250, air flows through the air flow channel and the holes and enters the spiral air duct 223 from the air inlet 222.

[0055] Of course, in other embodiments, the air inlet 222 is arranged on the side wall of the heating element 224. The heating element 224 is fixed on the base 250, and the air inlet 222 is arranged at an interval from the base 250, so that the air inlet 222 is directly communicated with the air flow channel.

[0056] The above uses specific examples to illustrate the present application, which is only for helping to understand the present application and is not intended to limit the present application. For those skilled in the art to which the present application pertains, based on the idea of the present application, several simple deductions, deformations or substitutions can also be made.

Claims

1. A heating device, characterized in that, Comprising: A support member having a receiving channel therein for placing an aerosol generating substrate. And A heating assembly, at least a part of which is inserted into the receiving channel and inserted into the aerosol generating substrate placed in the receiving channel; the heating assembly includes at least two air outlets, a spiral air passage and at least one air inlet, the spiral air passage is communicated with the air inlet and the air outlets, external air can enter the spiral air passage through the air inlet, the heating assembly can be energized to generate heat for heating the air entering the spiral air passage to form a hot air flow, and the hot air flow flows into the aerosol generating substrate through the air outlets for heating the aerosol generating substrate.

2. The heating device according to claim 1, wherein, The heating assembly includes a heating member, an electromagnetic coil and a heating body, the heating body is arranged in the heating member, at least a part of the structure of the heating body abuts against the inner side wall of the heating member to form the spiral air passage between the heating member and the heating body; at least two of the air outlets and at least one of the air inlets are arranged on the heating member; the electromagnetic coil is arranged outside the heating member, and after the electromagnetic coil is energized, a magnetic field is generated to make the heating body generate heat.

3. The heating device according to claim 2, characterized in that, The heating body includes a substrate and at least one spiral portion, at least one of the spiral portions is arranged continuously or at intervals along the axial direction of the substrate, the spiral portion abuts against the inner side wall of the heating member, and the spiral air passage is formed between the spiral portion, the substrate and the heating member.

4. The heating device according to claim 3, characterized in that, There are a plurality of the spiral portions, and at least two of the plurality of spiral portions have different pitches.

5. The heating device according to claim 4, characterized in that, The substrate has a first end and a second end along its axial direction, and the first end is inserted into the receiving channel; the pitches of the plurality of spiral portions gradually decrease along the direction from the first end to the second end.

6. The heating device according to claim 5, characterized in that, At least two of the air outlets are arranged close to the first end, and at least two of the air outlets are arranged offset from each other along the axial direction of the substrate; at least one of the air inlets is arranged close to the second end; And / or, there are at least two of the air inlets, at least two of the air inlets are arranged on the side wall of the heating body and close to the second end; at least two of the air inlets are arranged offset from each other along the axial direction of the substrate.

7. The heating device according to claim 5, characterized in that At least two of the air outlets are arranged close to the first end, and at least two of the air outlets are arranged offset from each other along the axial direction of the substrate; at least one of the air inlets is arranged at the end of the second end.

8. The heating device according to claim 2, characterized in that, The heating device further includes a bracket, the support member is arranged in the bracket to form an air inlet channel between the support member and the bracket, and the air inlet channel is communicated with the air inlet; the electromagnetic coil is arranged on the outer side wall of the bracket; an installation hole is further arranged on the support member, the installation hole is communicated with the receiving channel, and the heating member passes through the installation hole and is inserted into the receiving channel.

9. The heating device according to claim 8, characterized in that, The heating device further includes a base, the base is disposed within the bracket and is spaced apart from the support member, and the air inlet passage is formed between the base, the support member and the bracket; one end of the heating element is fixedly disposed on the base, and the other end passes through the mounting hole and is inserted into the accommodating passage.

10. An aerosol generating device, characterized in that, It includes a housing, a power supply component and the heating device according to any one of claims 1-9, the power supply component and the heating device are disposed within the housing; the power supply component and the heating device are electrically connected to provide the power required for the operation of the heating device.

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