Airflow heater and aerosol generating device

Abstract

The utility model discloses an airflow heater and an aerosol generating device, the airflow heater comprises a heating piece, the heating piece is provided with an air guide surface and an air outlet surface which are opposite in the axial direction of the heating piece, a plurality of convection channels are formed in the heating piece, air outlets of the convection channels are formed in the air outlet surface, and air inlets of the convection channels are formed in the air guide surface; the air guide face is arranged to be of a non-planar structure so that the air inlets of the multiple convection channels can be located at different height positions in the axial direction. The air inlet end of the heating piece is arranged to be in a non-planar structural form, so that air inlets of different convection channels can be located at different height positions, and air flow can be guided to gather towards a preset area of the air inlet end and enter the corresponding convection channels more easily; therefore, the difference between the air flow in the convection channel and the heat carried by the air flow is achieved, and a heat distribution form meeting the circumferential heating or center heating requirement is formed. Meanwhile, distribution of airflow and energy is changed by changing the shape of the outer contour of the heater, and implementation is easier.

Description

Technical Field

[0001] The utility model relates to the technical field of aerosol, in particular to an air flow heater and an aerosol generating device. Background Art

[0002] With the rapid development of the heat-not-burn technology, the application of aerosol generating devices is becoming more and more extensive. In some aerosol generating devices, an air flow heater is usually configured to heat the flowing air to form a hot air flow, so that during the process of the hot air flow flowing through the aerosol matrix, the aerosol matrix can be heated and atomized, and then the aerosol available for use can be generated.

[0003] For some existing air flow heaters, generally, the settings of air flow and heat distribution are achieved by adjusting the aperture size of the ventilation holes, the extending path of the ventilation holes, the distribution form of the ventilation holes in the device, etc. However, this method is likely to affect the convective heat transfer effect of the air flow and is not conducive to the heating and atomization of the aerosol matrix. Summary of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide an air flow heater and an aerosol generating device applying the air flow heater, so as to achieve the purpose of adjusting air flow and heat distribution.

[0005] According to a first aspect, an embodiment provides an air flow heater for being installed in an aerosol generating device to heat the flowing air flow; the air flow heater includes a heating member, the heating member has a gas guiding surface and an air outlet surface that are opposite to each other in the axial direction of the heating member, and a plurality of convection channels that are isolated from each other are formed inside the heating member, an air inlet of the convection channel is arranged on the gas guiding surface, and an air outlet of the convection channel is arranged on the air outlet surface; wherein, the gas guiding surface is arranged as a non-planar structure, so that the air inlets of the plurality of convection channels are at different height positions in the axial direction.

[0006] In one embodiment, the gas guiding surface is a convex surface structure that protrudes outward in the axial direction away from the air outlet surface, or the gas guiding surface is a concave surface structure that recesses inward in the axial direction toward the air outlet surface.

[0007] In one embodiment, the gas guiding surface is a spherical surface structure or a conical surface structure.

[0008] In one embodiment, the heating element includes a heating portion and a diversion portion that are axially connected. The surface of the heating portion at one end axially away from the diversion portion is the air outlet surface, and the surface of the diversion portion at one end axially away from the heating portion is the air guiding surface. The convection channel is axially formed through the heating portion and the diversion portion; wherein, the heating portion is configured to generate or receive heat to heat the airflow flowing through the heating element.

[0009] In one embodiment, it further includes a heating element for generating heat; the heating element is in contact with the heating portion so that the heat generated by the heating element can be conducted to the heating element.

[0010] In one embodiment, the heating element is circumferentially disposed on the outer surface of the heating portion along the heating element.

[0011] In one embodiment, a positioning structure is provided on the outer surface of the heating element, and the positioning structure is configured to limit and fix the heating element to the heating portion.

[0012] In one embodiment, the heating element further includes a receiving portion, the receiving portion is disposed at one end of the heating portion axially away from the diversion portion, and a receiving channel communicating with the convection channel is formed inside the receiving portion, and the receiving channel is configured to receive an aerosol matrix.

[0013] In one embodiment, the diversion portion, the heating portion and the receiving portion are of an integral structure; and / or a limiting structure is provided in the receiving channel, and the limiting structure is configured to abut against the aerosol matrix so that a preset distance is maintained between the air outlet surface and the aerosol matrix in the axial direction.

[0014] According to a second aspect, an embodiment provides an aerosol generating device, including a main body assembly and the airflow heater according to the first aspect. An intake channel and an outlet channel are formed inside the main body assembly, and the airflow heater is disposed between the intake channel and the outlet channel.

[0015] The air flow heater according to the above embodiments includes a heating element. The heating element has a gas guiding surface and an air outlet surface facing away from each other in its axial direction. A plurality of convection channels are formed inside the heating element. The air outlet of the convection channel is arranged on the air outlet surface, and the air inlet of the convection channel is arranged on the gas guiding surface. The gas guiding surface is set as a non-planar structure so that the air inlets of the plurality of convection channels are at different height positions in the axial direction. By setting the air inlet end of the heating element as a non-planar structural form, the air inlets of different convection channels can be at different height positions, which is beneficial to guiding the air flow to gather at a predetermined area position at the air inlet end of the heater and more easily enter the corresponding convection channel, thereby realizing the differentiation of the air flow rate and the heat carried by the air flow in the convection channel to form a heat distribution form suitable for circumferential heating or central heating requirements. At the same time, by changing the outer contour shape of the heater to design the air flow and heat distribution, it is not only easy to achieve, but also easy to process and manufacture the heater, which is beneficial to reducing the cost of the heater. Description of the Drawings

[0016] Figure 1 Schematic structural assembly diagram (I) of an air flow heater according to an embodiment.

[0017] Figure 2 Schematic structural assembly diagram (II) of an air flow heater according to an embodiment.

[0018] Figure 3 Schematic structural diagram of the heating element in an air flow heater according to an embodiment.

[0019] Figure 4 Schematic cross-sectional structural diagram of an air flow heater accommodating an aerosol article according to an embodiment.

[0020] Figure 5 Schematic cross-sectional structural diagram (I) of an air flow heater according to an embodiment.

[0021] Figure 6 Schematic cross-sectional structural diagram (II) of an air flow heater according to an embodiment.

[0022] Figure 7 Schematic cross-sectional structural diagram (III) of an air flow heater according to an embodiment.

[0023] Figure 8 Schematic cross-sectional structural diagram (IV) of an air flow heater according to an embodiment.

[0024] Figure 9 Schematic cross-sectional structural diagram of an aerosol generating device according to an embodiment.

[0025] In the figures:

[0026] 10. Heating element; 10a. Convection channel; 10b. Air guiding surface; 10c. Air outlet surface; 10d. Ring groove; 10e. Lead groove; 10f. Receiving channel; 10g. Limiting structure; 11. Heating part; 12. Drainage part; 13. Receiving part; 20. Heating element; 21. Heating sheet; 22. Electrode pin; 30. Host assembly; 30a. Intake channel; 30b. Outlet channel; A. Aerosol product. Detailed implementation manners

[0027] The present application will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. Similar elements in different implementation manners are labeled with related similar element numbers. In the following implementation manners, 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 to avoid the core part of the present application being overwhelmed by 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.

[0028] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various implementation manners. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are necessary sequences, unless it is stated that a certain sequence must be followed.

[0029] 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 meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connections (couplings).

[0030] Please refer to Figures 1 to 9 , an embodiment of the present application provides an air flow heater, which can be applied and installed in an aerosol generating device, and forms a hot air flow by heating the flowing air flow, so that the aerosol generating device mainly heats and atomizes the aerosol matrix in the form of a hot air flow to generate a usable aerosol. The air flow heater includes a heating element 10, a heating element 20, and other functional components that exist as needed; the following is a specific description.

[0031] Please refer to Figures 1 to 9, the heating element 10 is generally a columnar structure with a preset length. A plurality of mutually isolated or independent convection channels 10a are formed inside the heating element 10. The convection channels 10a are mainly used to guide air flow to flow through the heating element 10 from the inside of the heating element 10, so as to heat the air flow to a preset temperature by means of the heating element 10 to form a hot air flow (for example, heating the air flow to a temperature that can generate aerosol from the aerosol matrix but is not sufficient to cause combustion).

[0032] For the convenience of distinction and description, two surfaces of the heating element 10 that are opposite to each other in its axial direction (or length direction) are defined as an air guiding surface 10b and an air outlet surface 10c; wherein, the air inlet of the convection channel 10a is arranged on the air guiding surface 10b, and the air outlet of the convection channel 10a is arranged on the air outlet surface 10c; it can also be understood that one end where the air guiding surface 10b is located is the air inlet end of the heating element 10, and one end where the air outlet surface 10c is located is the air outlet end of the heating element 10, and the air inlet and air outlet of the convection channel 10a are respectively arranged through the air guiding surface 10b and the air outlet surface 10c.

[0033] Please refer to Figures 2 to 9 , the air guiding surface 10b is set as a non-planar structure, so that the air inlets of at least two of the plurality of convection channels 10a are at different height positions in the axial direction of the heating element 10; thus, by means of the non-planar structure form of the air guiding surface 10b or the height position difference of the air inlets of different convection channels 10a, the air flow can be aggregated or dispersed to a predetermined area position from the air inlet end of the heating element 10, so that the air flow rates in different convection channels 10a are different, thereby achieving the effect of adjusting the air flow and the distribution of the energy carried by the air flow to adapt to different heating requirements.

[0034] Exemplarily, please refer to Figures 2 to 6 , the air guiding surface 10b is a convex surface structure that protrudes outward in the axial direction of the heating element 10 away from the air outlet surface 10c (for example Figures 3 to 5 the spherical surface structure shown, or such as Figure 6 the conical surface structure shown); by using the height position difference of the air inlets of each convection channel 10a on the air guiding surface 10b, the air flow can more easily enter the corresponding convection channel 10a from the surrounding area of the air inlet end of the heating element 10, while the air intake in the central area position is relatively difficult; correspondingly, the air flow flowing through the heating element 10 from the surrounding area of the heating element 10 can carry more heat, and the air flow flowing through the central area of the heating element 10 carries relatively less heat; and based on the formed distribution form of the air flow and heat, it is beneficial to the realization of the circumferential heating mode and improves the circumferential heating effect on the aerosol matrix.

[0035] Exemplarily, please refer to Figure 7 and Figure 8, the air guiding surface 10b is a concave surface structure that is recessed inward in the axial direction of the heating element 10 towards the air outlet surface 10c (for example Figure 7 the spherical surface structure shown, or Figure 8 the conical surface structure shown). It can be understood that a groove structure is provided at the air inlet end of the heating element 10, and the air guiding surface 10b is the groove surface of this groove structure or the air guiding surface 10b encloses the groove body space of the groove structure. By means of the concave surface structure form of the air guiding surface 10b, the airflow can be guided to gather towards the central region of the heating element 10, making it easier for the central region of the heating element 10 to intake air and relatively more difficult for the surrounding regions to intake air; thus, the heating element 10 can be applied to the central heating mode to enhance the central heating effect on the aerosol matrix.

[0036] It should be noted that according to different heating modes or the different densities or volume sizes of different parts of the aerosol matrix, the air guiding surface 10b can also be set to a corresponding non-planar structure, such as an arc-shaped curved surface structure, a stepped surface structure, etc., so that the heating element 10 or the air flow heater is more likely to intake air in the area corresponding to the part of the aerosol matrix with a larger volume or density, and relatively more difficult to intake air in other areas. All these are not elaborated here.

[0037] Please refer to Figure 1 、 Figure 2 、 Figures 4 to 8 , the heating element 20 is in contact with and arranged on the heating element 10. The heating element 20 is mainly used to electrically connect to the power supply component of the aerosol generating device, so as to generate heat in the energized state and then transfer the heat to the heating element 10, thereby heating the flowing air through the heating element 10. Among them, the heating element 20 can be made of electrothermal materials such as nickel-chromium alloy and iron-chromium alloy, and the heating element 10 can be made of heat-conducting materials with high heat conductivity such as aluminum and copper; the heating element 20 can be coated and arranged on the outside of the heating element 10, or can be inserted inside the heating element 10.

[0038] In one embodiment, please refer to Figure 1 、 Figure 2 and Figure 5 , the heating element 20 includes a heating sheet 21 and electrode pins 22; among them, the heating sheet 21 can be a metal mesh sheet, an electrothermal material coating, or an FPC heating film, etc. coated and arranged on the outer surface (such as the circumferential surface) of the heating element 10. The electrode pins 22 are in electrical contact connection with the heating sheet 21 and are used to electrically connect to the power supply component of the aerosol generating device.

[0039] In some embodiments, the heating element 20 can also be omitted. The heating element 10 is made of electrothermal material and is electrically connected to the power supply component of the aerosol generating device through the electrode pin 21; thus, by energizing the heating element 10, the heating element 10 generates heat and heats the flowing air.

[0040] In some embodiments, the heating element 20 or the heating member 10 may also be made of a ferromagnetic material or an alloy material containing elements such as iron, nickel, cobalt, and titanium, or an inorganic non-metallic material with ferromagnetic properties such as magnetized ceramics and carbon fibers. By placing the air flow heater in an alternating electromagnetic field environment provided by the aerosol generating device (for example, arranging electromagnetic coils around the air flow heater inside the aerosol generating device), the heating element 20 or the heating member 10 is heated by the alternating magnetic field, and then the flowing air is heated.

[0041] Based on this, by setting the air inlet end of the air flow heater (specifically, the heating member 10) to a non-planar structural shape, the air flow can be guided and distributed based on the structural forms at different height positions presented by the air inlet of the convection channel 10a on the air guiding surface 10b, so that the air flow can more easily enter and flow through the heating member 10 from a preset area position at the air inlet end of the air flow heater (such as the surrounding area or the central area of the air inlet end), thereby realizing differential regulation of the air flow rate in the convection channel and changing the energy or heat distribution in the air flow heater.

[0042] By changing the outer contour shape of the air flow heater to change the air flow and energy distribution, on the one hand, it will not only not affect the heat convection effect of the air flow, but also can reduce the setting accuracy of the convection channel 10a. Through the regulation and design of the energy distribution of the air flow heater, the air flow heater can be adapted to the heating mode requirements such as circumferential heating and central heating, which is beneficial to improving the heating effect of the corresponding heating mode. On the other hand, compared with the related art, in the solution of changing the air flow and energy distribution by changing the size, distribution, and path of the ventilation holes, the embodiments of the present application are easier to implement in the process of manufacturing the air flow heater (for example, there is no need to set a complex convection channel 10a), which can effectively reduce the processing and manufacturing difficulty and manufacturing cost of the air flow heater.

[0043] In one embodiment, please refer to Figures 2 to 8 , the heating member 10 includes a heating part 11 and a drainage part 12 connected in the axial direction of the heating member 10; it can also be understood that the heating part 11 and the drainage part 12 can be formed by structurally or functionally differentiating the heating member 10 along the axial direction of the heating member 10. Among them, the surface or end face of the heating part 11 at the end away from the drainage part 12 in the axial direction includes an air outlet surface 10c, while the surface or end face of the drainage part 12 at the end away from the heating part 11 in the axial direction includes an air guiding surface 10b, and the convection channel 10a runs through the heating part 11 and the drainage part 12 along the axial direction.

[0044] Exemplarily, the heating part 11 is mainly used to receive the heat generated by the heating element 20. The heating element 20 is disposed around the circumference of the heating part 11 on the outer peripheral surface thereof; the heat generated by the heating element 20 is first transferred to the heating part 11, and during the process that the air flow enters from the side of the air guiding surface 10b and flows through the heating part 11, it is heated by the heating part 11 to form a hot air flow.

[0045] Exemplarily, in an embodiment where the heating element 20 is omitted, the heating part 11 can be made of electrothermal material or electromagnetic material, so that the heat generated by the heating part 11 is transferred to the flowing air.

[0046] Regarding the structural form of the drainage part 12, please refer to Figure 5 and Figure 6 , the drainage part 12 can be set to a hemispherical shape, and the outer surface of the drainage part 12 can be understood as the air guiding surface 10b; please refer to Figure 1 , the drainage part 12 can also be set to other shapes such as a frustum shape or a conical shape. The conical bottom end of the drainage part 12 is the end connected to the heating part 11, and the conical top end is the end axially away from the heating part 11. The outer surface of the drainage part 12 can be understood as the air guiding surface 10b.

[0047] In some embodiments, the drainage part 12 can also adopt other structural forms. For example, please refer to Figure 7 and Figure 8 , a spherical groove or a conical groove and other groove structures are arranged in the drainage part 12, and the surface of the groove space enclosing the groove structure can be understood as the air guiding surface 10b.

[0048] In one embodiment, please refer to Figure 3 and in combination with Figure 2 , a positioning structure is provided on the outer surface of the heating part 10. The positioning structure includes an annular groove 10d that is circumferentially enclosed on the circumferential surface of the heating part 11 along the circumference of the heating part 10, and a lead wire groove 10e that extends axially along the heating part 10 on the outer surface of the drainage part 12; wherein, the heating sheet 21 is embedded in the annular groove 10d, and the electrode lead 22 is arranged through the lead wire groove 10e. Thus, by means of the positioning structure formed by the annular groove 10d and the lead wire groove 10e, not only can the heating element 20 be firmly restricted and fixed to the heating part 10, but also the structural compactness of the air flow heater can be effectively enhanced, creating favorable conditions for the installation and application of the air flow heater.

[0049] In other embodiments, according to the different structural configurations or assembly forms of the heating element 20, the positioning structure can also adopt other suitable structural forms. For example, the heating element 20 can be disposed to cover the outer surfaces of the heating part 11 and the drainage part 12, and the positioning structure can be a sunk groove structure provided on the outer surface of the heating part 10; all these are not elaborated here.

[0050] In one embodiment, please refer to Figures 2 to 8 , the heating member 10 further includes a receiving portion 13 disposed at one end of the heating portion 11 away from the drainage portion 12 in the axial direction of the heating member 10. A receiving channel 10f communicating with the convection channel 10a is formed inside the receiving portion 13. It can also be understood that the air outlet surface 10c or the air outlet of the convection channel 10a is located within the receiving channel 10f. The receiving channel 10f is mainly used to receive the aerosol matrix. For example, a part of the aerosol article A is inserted into the receiving portion 13 through the receiving channel 10f.

[0051] Thus, the aerosol matrix (specifically, the aerosol article A) can be received by means of the receiving portion 13 so that the aerosol article A remains in contact with the air flow heater. The heat received or generated by the heating portion 11 can also be transferred to the receiving portion 13, so as to circumferentially heat the aerosol matrix from all around by means of the receiving portion 13, thereby improving the heating effect and quickly generating aerosol.

[0052] Exemplarily, in an embodiment where the air guiding surface 10b adopts a spherical surface structure or a conical surface structure protruding outward away from the heating portion 11, the heat received by the receiving portion 13 can make the heat in the surrounding area of the heating member 10 more concentrated, so that the rapid generation of aerosol can be achieved.

[0053] In one embodiment, please refer to Figures 4 to 8 , a limiting structure 10g is provided in the receiving channel 10f. The limiting structure 10g protrudes from the air guiding surface 10b and is mainly used to abut against the aerosol matrix so that the air inlet of the convection channel 10a and the aerosol matrix maintain a preset gap or distance in the axial direction of the heating member 10. The aerosol matrix can be prevented from blocking the air outlet of the convection channel 10a by means of the limiting structure 10g, so that the hot air flow can smoothly enter the receiving channel 10f, thereby heating and atomizing the aerosol matrix.

[0054] In some embodiments, a sunk groove structure can be provided on the end surface of the heating portion 11 located within the receiving channel 10f. The groove surface of the sunk groove structure is the air outlet surface 10c, and the portion surrounding the sunk groove structure is the limiting structure 10g. In other embodiments, the limiting structure 10g can also be one or more protruding structures protruding from the air guiding surface 10b.

[0055] In one embodiment, please refer to Figure 1 , the drainage portion 12, the heating portion 11 and the receiving portion 13 adopt an integral structure, that is, the three are integrally formed of the same material. With the integral heating member 10, the air flow heater can be assembled and formed conveniently and quickly, realizing the disassembly and assembly application of the air flow heater, and is also beneficial to reducing heat loss and improving heat utilization rate.

[0056] In other embodiments, the receiving portion 13 may also be an independent structural member in contact and cooperation with the heating member 10. For example, the receiving portion 13 is detachably assembled at one end of the heating portion 11 away from the drainage portion 12, so as to meet different structural designs or application requirements.

[0057] Please refer to Figure 9 and in combination with Figures 1 to 8 , the embodiment of the present application further provides an aerosol generating device, including a host component 30 and the airflow heater of the foregoing embodiment. Among them, an air intake passage 30a and an air outlet passage 30b are formed inside the host component 30. The airflow heater is disposed between the air intake passage 30a and the air outlet passage 30b. For example, the air inlet of the convection passage 10a is communicated with the air intake passage 30a, and the receiving passage 10f is communicated with the air outlet passage 30b.

[0058] By means of the airflow heater's deployment of the airflow and energy distribution within the host component 30, a circumferential heating mode, a central heating mode, etc. mainly based on hot air flow can be realized for the aerosol generating device, and the corresponding heating effect can be effectively improved.

[0059] Regarding the host component 30, the structure, function, and the connection or cooperation relationship between it and the airflow heater, etc., can refer to the prior art.

[0060] Exemplarily, the host component 30 can be assembled by combining a body shell, internal pipe fittings, a power supply, a control circuit board, a key switch, etc. With the help of the body shell, the user can hold, move, and operate the aerosol generating device. The air intake passage 30a and the air outlet passage 30b are constructed inside the body shell by means of the internal pipe fittings. The heating member 10 can be fixed to the internal pipe fittings and arranged to communicate between the air intake passage 30a and the air outlet passage 30b. At the same time, the heating element 20 is electrically connected to the power supply components such as the power supply.

[0061] It should be noted that a typical aerosol matrix is usually packaged or shaped by a material with high heat resistance and mechanical strength (such as a paper material dedicated to cigarette sticks or a polyamide ester material). Therefore, the aerosol matrix mentioned in some embodiments of the present application can be understood as the aerosol product A.

[0062] It should be noted that Figure 9 the solid line with a single arrow represents the approximate path or direction of the airflow, and the thick solid line with a double arrow represents the cooperation relationship between the aerosol product A and the aerosol generating device.

[0063] The above uses specific examples to elaborate on the present utility model, which is only used to help understand the present utility model and is not intended to limit the present utility model. For those skilled in the technical field to which the present utility model pertains, based on the idea of the present utility model, several simple deductions, deformations or substitutions can also be made.

Claims

1. An air flow heater, characterized in that: Used to be installed in an aerosol generating device to heat the air flow passing through; the air flow heater includes a heating element, the heating element has an air guide surface and an air outlet surface opposite to each other in the axial direction of the heating element, a plurality of convection channels isolated from each other are formed inside the heating element, the air inlet of the convection channel is arranged on the air guide surface, and the air outlet of the convection channel is arranged on the air outlet surface; wherein the air guide surface is arranged to be a non-planar structure so that the air inlets of the plurality of convection channels are at different height positions in the axial direction.

2. The air flow heater according to claim 1, characterized in that The air guiding surface is a convex structure protruding outwardly in the axial direction away from the air outlet surface, or the air guiding surface is a concave structure recessed inwardly in the axial direction toward the air outlet surface.

3. The air flow heater according to claim 2, characterized in that: The air guide surface is a spherical structure or a conical structure.

4. The air flow heater according to any one of claims 1 to 3, characterized in that: The heating element includes a heating portion and a drainage portion connected to each other in the axial direction, the surface of the heating portion away from one end of the drainage portion in the axial direction is the air outlet surface, the surface of the drainage portion away from one end of the heating portion in the axial direction is the air guide surface, and the convection channel is arranged to penetrate the heating portion and the drainage portion along the axial direction; wherein the heating portion is used to generate or receive heat to heat the airflow flowing through the heating element.

5. The air flow heater according to claim 4, characterized in that It also includes a heating element for generating heat; the heating element is arranged in contact with the heating part so that the heat generated by the heating element can be conducted to the heating element.

6. The air flow heater according to claim 5, characterized in that The heating element is covered on the outer surface of the heating portion along the circumference of the heating element.

7. The air flow heater according to claim 6, characterized in that A positioning structure is provided on the outer surface of the heating element, and the positioning structure is used to restrict and fix the heating element to the heating portion.

8. The air flow heater according to claim 4, characterized in that The heating element further comprises a receiving portion, which is arranged at one end of the heating portion away from the drainage portion in the axial direction, and a receiving channel connected to the convection channel is formed inside the receiving portion, and the receiving channel is used to receive the aerosol matrix.

9. The air flow heater according to claim 8, characterized in that The drainage portion, the heating portion and the receiving portion are an integrated structure; and / or a limiting structure is provided in the receiving channel, and the limiting structure is used to resist the aerosol matrix so that the gas outlet surface and the aerosol matrix maintain a preset distance in the axial direction.

10. An aerosol generating device, characterized in that: It comprises a main unit component and an air flow heater as described in any one of claims 1 to 9, wherein an air inlet channel and an air outlet channel are formed inside the main unit component, and the air flow heater is arranged between the air inlet channel and the air outlet channel.

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