Airflow heating assembly and aerosol generator

Abstract

This application relates to the technical field of aerosol generating devices (1000), and relates to an air flow heating assembly (100) and an air flow heating device. The air flow heating assembly (100) includes a gas guide element (10) provided with a first mounting cavity (12) inside and a plurality of through gas guide passages (11) for gas to flow through, and is provided inside the first mounting cavity (12). A heating element (20) that is electrically connected to an external power source and heats the gas guide element (10) so that the gas flowing through the gas guide passage (11) is heated by the gas guide element (10). By providing the heating element (20) inside the gas guide element (10), the problem that the conventional heating element (20) is externally fitted outside the gas guide element (10) and part of the heat is released to the outside can be effectively overcome, and the heating efficiency of the heating element (20) can be improved.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on July 8, 2022, with the application number 202210802011.6 and the title of the invention being "Airflow Heating Assembly and Aerosol Generator", and all its contents are incorporated herein by reference.

[0002] The embodiments of this application relate to the technical field of aerosol generators, and particularly to airflow heating assemblies and aerosol generators.

Background Art

[0003] With the development and popularization of non - combustion heating technologies, the application of aerosol generators is becoming increasingly widespread. In an aerosol generator, the heating device is the most important component. By heating the aerosol - generating product with the heating device, smoke can be generated from the aerosol - generating product. Currently, there is also a solution to heat the aerosol - generating product by heating the airflow, but it has a relatively large volume and relatively high power consumption.

Summary of the Invention

[0004] The embodiments of this application provide an airflow heating assembly and an aerosol generator capable of reducing power consumption.

[0005] One of the technical means adopted in the embodiments of this application is an airflow heating assembly for generating an aerosol by heating an aerosol - generating product, comprising a gas - guiding element provided with a first mounting cavity therein and a plurality of through gas - guiding passages for gas flow, and a heating element electrically connected to an external power source and provided in the first mounting cavity to heat the gas - guiding element so that the gas flowing through the gas - guiding passages is heated by the gas - guiding element.

[0006] Another technical means adopted in the embodiments of the present application is an air flow heating assembly for generating aerosol by heating an aerosol generating product, which includes a gas guide element provided with a first mounting cavity inside and a plurality of through gas guide passages for gas to flow through, and a heating element electrically connected to an external power source and provided in the first mounting cavity for heating the gas guide element so that the gas flowing through the gas guide passages is heated by the gas guide element. The gas guide element is made of graphite or graphite alloy, and an air flow heating assembly is provided.

[0007] Yet another technical means adopted in the embodiments of the present application is an aerosol generating device for generating aerosol by heating an aerosol generating product, which includes a housing provided with a receiving cavity inside for removably providing the aerosol generating product, and the above-mentioned air flow heating assembly provided at an upstream position of the air flow of the aerosol generating product in the receiving cavity so that the air passing through it is heated and then enters the aerosol generating product. An aerosol generating device is provided.

[0008] The air flow heating assembly according to the embodiments of the present application includes a gas guide element provided with a first mounting cavity inside and a plurality of through gas guide passages for gas to flow through, and a heating element provided in the first mounting cavity and electrically connected to an external power source for heating the gas guide element so that the gas flowing through the gas guide passages is heated by the gas guide element. By providing the heating element inside the gas guide element, the heating efficiency of the heating element can be improved, and the power consumption of the air flow heating assembly can be reduced.

Brief Description of the Drawings

[0009] In the following, in order to more clearly explain the technical means of specific embodiments of the present application, the drawings necessary for the specific embodiments will be briefly described. In all the drawings, similar elements or parts are usually given the same reference numerals. Also, in the drawings, each element or part is not necessarily drawn to an actual scale.

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Modes for Carrying Out the Invention

[0010] To facilitate the understanding of the present application, the present application will be described in more detail below with reference to the drawings and specific embodiments. When an element is expressed as being "fixed" to another element, it may be a direct fixation or a fixation with one or more intervening elements. When an element is expressed as being "connected" to another element, it may be a direct connection or a connection with one or more intervening elements. The orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of explaining and simplifying the description of the present application, and does not indicate or imply that the device or element mentioned must have a specific orientation and be configured and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present application. Also, the terms "first" and "second" are used only for the purpose of explanation and should not be understood as indicating or suggesting relative importance.

[0011] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of explaining specific embodiments and are not for limiting this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0012] Also, the technical features regarding different embodiments of the present application described below can be combined with each other as long as they do not conflict.

[0013] As shown in FIG. 1, the airflow heating assembly 100 includes a gas guide element 10 and a heating element 20. The heating element 20 is connected to the gas guide element (gas guide member) 10. The heating element 20 is electrically connected to an external power source and is for heating the gas guide element 10. The gas guide element 10 is for gas to flow through and gives thermal energy to the gas by heating the gas flowing inside.

[0014] In one embodiment of the application, the gas guide element 10 is made of graphite or a graphite alloy. The gas guide element 10 made of graphite or a graphite alloy has good thermal conductivity. By directly heating the gas guide element 10 with the heating element 20, the gas guide element 10 can be heated to a preset temperature in a short time. For example, the gas guide element 10 can be heated to 300 °C or higher within 25 seconds.

[0015] Regarding the above gas guide element 10, as shown in FIGS. 1 and 2, the gas guide element 10 is provided with at least one first mounting cavity 12 and a plurality of gas guide passages 11. The first mounting cavity 12 is provided inside the gas guide element 10 and is for mounting the heating element 20. The gas guide passages 11 penetrate the gas guide element 10 along the axial direction of the gas guide element 10 and are for gas to flow through. When the heating element 20 is in an operating state and the gas guide element 10 is heated, the gas passing through the gas guide passages 11 is heated by the gas guide element 10 to form a hot air flow. The hot air flow flows into the aerosol generating product and heats the aerosol generating product. The temperature of the hot air flow is 200 °C to 400 °C.

[0016] In some embodiments, the shapes of the plurality of gas guide passages 11 are cylindrical. Specifically, the diameter D1 of the gas guide passage 11 satisfies 0 < D1 ≤ 0.5 mm. By adopting the solution of the small-diameter gas guide passage 11, the number of gas guide passages 11 can be increased within the limited space of the gas guide element 10, while the heating efficiency of the gas flowing through the gas guide passages 11 can be improved. When the gas guide passage 11 is too large, the gas flow rate increases, preventing the gas heating effect from being good.

[0017] In some embodiments, the ratio of the sum of the cross-sectional areas of the plurality of gas guide passages 11 to the cross-sectional area of the gas guide element 10 is 1 / 5 or more. The cross-section of the gas guide passage 11 is within the cross-section of the gas guide element 10, and both the cross-section of the gas guide passage 11 and the cross-section of the gas guide element 10 are perpendicular to the center line of the gas guide element 10. On the premise that the structural stability of the gas guide element 10 is satisfied, the ratio of the cross-sectional area of the gas guide passage 11 to the cross-sectional area of the gas guide element 10 approaching 1 means that the effective area of the gas guide passage 11 increases and the area through which gas can flow increases. Also, when the cross-sectional area of each individual gas guide passage 11 is constant, it means that the number of gas guide passages 11 provided in the gas guide element 10 also increases.

[0018] In some embodiments, a plurality of circumferences of gas guide passages are provided surrounding the center of the gas guide element 10. The ratio of the number of gas guide passages 11 on the inner circumference to the number of gas guide passages 11 on the outer circumference is equal to the ratio of the radius of the inner circumference to the radius of the outer circumference. As going from the center of the cross-section of the gas guide element 10 towards the edge of the cross-section of the gas guide element 10, the number of gas guide passages 11 provided increases, thereby increasing the passages through which gas can flow. In some embodiments, the plurality of gas guide passages 11 are provided in an annular array, that is, the distance between two adjacent gas guide passages 11 on the same circumference is equal.

[0019] In some embodiments, as shown in FIGS. 2 and 8, the gas guide element 10 (1) the diameter D3 of the gas guide element 10 satisfies 4 mm ≤ D3 ≤ 8 mm, (2) the diameter D3 of the gas guide element 10 satisfies 6 mm ≤ D3 ≤ 7 mm, (3) the cross-sectional area S1 of the gas guide element 10 satisfies 10 mm 2 ≤ S1 ≤ 50 mm 2 ; (4) the cross-sectional area S1 of the gas guide element 10 satisfies 25 mm 2 ≤ S1 ≤ 35 mm 2 ; (5) The axial length L1 of the gas guide element 10 satisfies 5 mm ≤ L1 ≤ 10 mm, and (6) The axial length L1 of the gas guide element 10 satisfies 7 mm ≤ L1 ≤ 9 mm satisfies at least one of the conditions.

[0020] In some other embodiments, the gas guide passage 11 may have an irregular shape, and the gas guide passages 11 may be distributed linearly, radially, or randomly on the gas guide element 10.

[0021] It should be understood that the first mounting cavity 12 is provided inside the gas guide element 10 means that the first mounting cavity 12 is recessed from the outer surface of the gas guide element 10 into the inside of the gas guide element 10, or a cavity or gap for mounting the heating element 20 is formed between two adjacent independent members of the gas guide element 10 assembled by two or more independent members. Specifically, the following embodiments can be referred to.

[0022] In some embodiments, as shown in FIG. 3, the gas guide element 10 includes a first gas guide block 13 and a second gas guide block 14. The first gas guide block 13 and the second gas guide block 14 are sequentially provided along the extending direction of the center line of the gas guide element 10, that is, the end face of the first gas guide block 13 and the end face of the second gas guide block 14 are provided to face each other. A first mounting cavity 12 is formed between the first gas guide block 13 and the second gas guide block 14, and the heating element 20 is provided in the first mounting cavity 12. Specifically, the heating element 20 between the first gas guide block 13 and the second gas guide block 14 is in the shape of a sheet and may be a mesh heating net, a metal sheet, or a flexible heating film, etc.

[0023] In some embodiments, as shown in FIG. 4, the gas guide block includes a first gas guide block 13 and a second gas guide block 14. The first gas guide block 13 and the second gas guide block 14 are sequentially provided along a direction perpendicular to the extending direction of the center line of the gas guide element 10, that is, the side surface of the first gas guide block 13 and the side surface of the second gas guide block 14 are provided to face each other. A first mounting cavity 12 is formed between the first gas guide block 13 and the second gas guide block 14, and the heating element 20 is provided in the first mounting cavity 12. Specifically, the heating element 20 is in the shape of a sheet and may be wound into a rod shape. Specifically, it may be a mesh heating net, a metal sheet, or a flexible heating film.

[0024] In some other embodiments, the gas guide block includes a first gas guide block 13 and a second gas guide block 14. A through groove is provided in the first gas guide block 13, and the second gas guide block 14 is provided in the through groove. The gap formed between the first gas guide block 13 and the second gas guide block 14 becomes the first mounting cavity 12, and the heating element 20 is provided in the first mounting cavity 12. In some embodiments, the heating element 20 is in a cylindrical or annular shape and is externally fitted to the outer surface of the second gas guide block 14 and is mounted in the through groove together with the second gas guide block 14. In some other embodiments, the heating element 20 is a resistance heating wire. The resistance heating wire is wound around the outer surface of the second gas guide block 14 and is mounted in the through groove together with the second gas guide block 14. In still some other embodiments, the heating element 20 may be a mesh metal net, a heating film, etc.

[0025] Of course, in some other embodiments, the gas guide element 10 may include a plurality of gas guide blocks. The plurality of gas guide blocks are stacked vertically along the extending direction of the center line of the gas guide element 10, or stacked horizontally along the direction perpendicular to the extending direction of the center line of the gas guide element 10. The heating element 20 is provided in the gap between two adjacent gas guide blocks and heats the two adjacent gas guide blocks respectively.

[0026] Regarding the above-mentioned first mounting cavity 12, as shown in FIGS. 1 and 2, the first mounting cavity 12 is provided at the center of the gas guide element 10, and the heating element 20 is provided in the first mounting cavity 12. By providing the heating element 20 at the center of the gas guide element 10, the characteristics of the heating element 20 that generates heat in a spot-radial manner are utilized, and by heating from the center of the gas guide element 10 radially outward, the heat loss of the heating element 20 can be significantly reduced, and the thermal efficiency of the airflow heating assembly 100 can be improved.

[0027] In some embodiments, the first mounting cavity 12 may be tubular. Its diameter D2 satisfies 0 mm < D2 ≤ 2.5 mm. On the premise that the heating element 20 can be mounted in the first mounting cavity 12, the smaller the diameter of the first mounting cavity 12, the more space of the gas guide element 10 can be released, and the number of gas guide passages 11 can be increased. In order to more effectively achieve the effect of space release, the diameter D2 of the first mounting cavity 12 may further satisfy 0 mm < D2 ≤ 1.7 mm.

[0028] In some embodiments, the first mounting cavity 12 may be a flat groove, which may be provided horizontally or vertically on the gas guide element 10. The flat groove is for inserting the sheet-shaped heating element 20. Specifically, the sheet-shaped heating element 20 may be a resistive heating sheet containing a metal material. Thereby, the space occupied by the first mounting cavity 12 in the gas guide element 10 can be reduced, the heating element 20 and the gas guide element 10 can be made as close as possible, better contact can be maintained, and it can also contribute to improving the heating efficiency.

[0029] In some embodiments, the number of the first mounting cavities 12 is plural, and the number of the heating elements 20 is also plural. The plural heating elements 20 are provided in the plural first mounting cavities 12. The plural first mounting cavities 12 may be provided surrounding the center of the gas guide element 10, may be provided linearly, or may be provided randomly. By providing a plurality of heating elements 20 on the gas guide element 10, the time required to heat the gas guide element 10 can be effectively shortened, and the thermal efficiency of the airflow heating assembly 100 can be improved.

[0030] In some embodiments, at least a part of the inner surface of the first mounting cavity 12 and the outer surface of the heating element 20 are provided to be in close contact, thereby reducing the gap between the outer surface of the heating element 20 and the inner surface of the first mounting cavity 12 and enhancing the direct heating effect of the heating element 20 on the gas guide element 10. Specifically, a flat heating wire can be used as the heating element, whereby the outer surface of the spiral heating wire can be in a smooth state. When the spiral heating wire is installed in the first mounting cavity 12, the outer surface of the heating wire can be in close contact with the inner surface of the first mounting cavity 12, so that the heat generated by the heating wire is directly transmitted to the gas guide element 10, and the heat loss is reduced.

[0031] In some embodiments, the first mounting cavity 12 penetrates through the gas guide element 10. The first mounting cavity 12 is for mounting the heating element 20, and can allow the airflow to pass through, and can increase the airflow passage in the gas guide element 10. In some embodiments, the first mounting cavity 12 may be provided as a blind via, whereby the fixing of the heating element 20 to the first mounting cavity 12 is facilitated, and the gas heated by the heating element 20 in the first mounting cavity 12 directly enters the inside of the aerosol generating product, preventing the user from getting burned when inhaling the smoke generated by the aerosol generating product.

[0032] In some embodiments, only a part of the heating element 20 and the first mounting cavity 12 may overlap, and the first mounting cavity 12 may be provided only in a part of the region of the gas guide element 10. For example, the axial length of the heating element 20 inserted into the first mounting cavity 12 is at least 1 / 3 of the axial length of the gas guide element.

[0033] In some embodiments, as shown in FIG. 6, a contact portion 122 is provided on the inner wall of the first mounting cavity 12. The contact portion 122 is for contacting one end of the heating element 20 for mounting the heating element 20, and the heating element 20 is fixed to the first mounting cavity 12 by the connection between the contact portion 122 and other members. In some embodiments, the contact portion 122 may be a stepped surface. In some embodiments, an engaging groove is provided on the inner wall of the first mounting cavity 12. The engaging groove can fix the heating element 20 to the first mounting cavity 12 by engaging and connecting with the heating element 20.

[0034] In some embodiments, as shown in FIGS. 5 and 6, the heating element 20 is provided with a ventilation gap 21. The ventilation gap 21 increases the gas passage in the first mounting cavity 12. By increasing the passage of the gas directly or indirectly heated by the heating element 20, the utilization rate of the hot gas is improved. There are multiple methods for forming the ventilation gap 21 of the heating element 20, and some of these methods can refer to the following embodiments.

[0035] For example, a first hollow groove is provided inside the heating element 20, and at least the top of the first hollow groove penetrates to the gas guide element 10 and / or at least the top of the first hollow groove penetrates to the bottom of the aerosol generating product. The first hollow groove constitutes the ventilation gap 21 of the heating element 20, allowing gas to flow through the first mounting cavity 12, increasing the gas passage, and enabling the gas directly heated by the heating element 20 to flow into the aerosol generating product. Further, a plurality of protrusions may be provided on the inner wall surface of the first hollow groove. The plurality of protrusions change the flow direction of the air flow in the first hollow groove, causing the gas flowing in the first hollow groove to flow in an "S" shape, increasing the heat absorbed by the gas, and preventing the air flow at a temperature much lower than the preset heating temperature from entering the aerosol generating product prematurely.

[0036] For example, a plurality of first through holes penetrating the first hollow groove and the side wall surface of the heating element 20 are provided inside the heating element 20. The ventilation gap 21 of the heating element 20 is constituted by the first hollow groove and the plurality of first through holes. The plurality of first through holes communicate with the gas guide passage 11 of the gas guide element 10, so that after the gas inside the heating element 20 is heated, it flows through the gas guide passage 11 into the aerosol generating product.

[0037] For example, a plurality of concave grooves are provided on the outer peripheral surface of the heating element 20. When the heating element 20 is mounted in the first mounting cavity 12, a ventilation gap 21 is formed by the concave grooves and the inner surface of the first mounting cavity 12. The heating element 20 directly heats the gas flowing through the concave grooves while heating the gas guide element 10. Thereby, the gas passage increases.

[0038] In some embodiments, as shown in FIGS. 5 and 6, the heating element 20 is formed by a spiral heating wire. By making the heating wire spiral, a plurality of ventilation gaps 21 are formed. Note that the heating element 20 may be partially spiral or entirely spiral.

[0039] Specifically, the heating element 20 may have a two-layer spiral structure composed of a first spiral layer 22 and a second spiral layer 23. The second spiral layer 23 is provided outside the first spiral layer 22. In the axial direction of the spiral center line of the heating element 20, the spiral pitch of the second spiral layer 23 is larger than that of the first spiral layer 22, whereby the shape of the heating element 20 becomes screw-like. By providing a spiral fixing groove 123 for screw connection to the second spiral layer 23 on the inner wall surface of the first mounting cavity 12, the heating element 20 can be directly fixed in the first mounting cavity 12, reducing the members for fixing the heating element 20 and helping to reduce the volume of the airflow heating assembly 100.

[0040] For example, an engaging portion 24 is provided on the heating element 20. When the heating element 20 is inserted into the first mounting cavity 12, the engaging portion 24 engages with the engaging groove of the first mounting cavity 12 to fix the heating element 20 in the first mounting groove. In some embodiments, the engaging groove is provided at the opening of the cavity of the first mounting cavity 12, and the engaging portion 24 is provided at one end of the heating element 20, so that the heating element 20 and the first mounting cavity 12 can be engaged only at the opening of the cavity. In this way, the portion of the heating element 20 inserted into the first mounting cavity 12 can be in direct close contact with the inner surface of the first mounting cavity 12, reducing the heat loss of the heating element 20.

[0041] In some embodiments, as shown in FIGS. 6 and 8, the heating element 20 is (1) the diameter D4 of the heating element 20 satisfies 1 mm ≦ D4 ≦ 2 mm, (2) the diameter D4 of the heating element 20 satisfies 1.4 mm ≦ D4 ≦ 1.7 mm, (3) the area S2 enclosed by the outer contour of the cross-section of the heating element 20 is 0.7 mm 2 ≦ S2 ≦ 3.5 mm 2 and the cross-section of the gas guide element 10 is perpendicular to the center line of the gas guide element 10, and (4) the axial length L2 of the heating element 20 satisfies 4 mm ≦ L2 ≦ 9 mm satisfies at least one of the conditions.

[0042] In some embodiments, the heating element 20 can be made of at least one of a metal material, a metal alloy, graphite, carbon, a conductive ceramic, or a composite material of a ceramic material and a metal material, having an appropriate impedance. Examples of suitable metal or alloy materials include at least one of nickel, cobalt, zirconium, titanium, nickel alloy, cobalt alloy, zirconium alloy, titanium alloy, nickel-chromium alloy, nickel-iron alloy, iron-chromium alloy, iron-chromium-aluminum alloy, titanium alloy, iron-manganese-aluminum-based alloy, or stainless steel.

[0043] In some embodiments, as shown in FIG. 7, the air flow heating assembly 100 further includes a piercing type heating element 30. The piercing type heating element 30 is provided at one end of the gas guide element 10 and is for piercing into the tobacco section of the aerosol generating product to transfer the heat generated by the heating element 20 to the aerosol generating product.

[0044] The piercing type heating element 30 includes a piercing portion 31 and a mounting portion 32. One end of the mounting portion 32 is connected to the gas guide element 10, and the other end is connected to the piercing portion 31. The piercing portion 31 is for piercing the inlet end of the tobacco section of the aerosol generating product. Inside the mounting portion 32, a second mounting cavity 321 is provided. The second mounting cavity 321 communicates with the first mounting cavity 12. The heating element 20 is provided in the first mounting cavity 12 and the second mounting cavity 321, and heats the gas guide element 10, the mounting portion 32, and the piercing portion 31 simultaneously. Through holes 322 that penetrate are provided on the side wall surface of the mounting portion 32. When the piercing type heating element 30 pierces into the aerosol generating product, the heated gas enters from the first mounting cavity 12 into the second mounting cavity 321 through the through holes 322 that communicate the second mounting cavity 321 with the outside, and then enters into the aerosol generating product, and the aerosol generating product is heated in this process.

[0045] In some embodiments, as shown in FIG. 8, the airflow heating assembly 100 further includes a cover plate 40. The cover plate 40 is provided at the other end of the gas guide element 10 and fixes the heating element 20 in the first mounting cavity 12 by coupling with the contact portion 122 in the first mounting cavity 12. At least a part of the cover plate 40 may be made of ceramic so as to effectively insulate heat. Similarly, the contact portion may also be formed by at least a part of the gas guide element 10, or may be formed by the heating element provided inside the first mounting cavity 12.

[0046] In some embodiments, as shown in FIG. 8, the airflow heating assembly 100 further includes a heat insulation assembly. The heat insulation assembly 200 includes an inner tube portion 202 and an outer tube portion 203. An accommodation cavity 201 is provided inside the inner tube wall. The inner tube wall may be provided with a mounting structure that matches the gas guide element 10. Thereby, the gas guide element 10 can be incorporated inside the inner tube wall, and the aerosol generating product can be inserted into the accommodation cavity 201 so as to be in close contact with the accommodation cavity 201. The outer tube portion 203 is externally fitted outside the inner tube portion 202. A cavity 204 is formed between the inner tube portion 202 and the outer tube portion 203 by an enclosure. The inside of the cavity 204 has a certain degree of vacuum, or is filled with an inert gas having a low thermal conductivity, or a solid medium or a liquid medium having a low thermal conductivity. Note that "close contact" preferably means that the distance between the inner tube portion 202 and the aerosol generating product is as small as possible. Thereby, the circumferential outer surface of the aerosol generating product can be auxiliary heated by the residual temperature of the inner tube portion 202, supplement the baking of the outer surface of the aerosol generating product, and make the baking of the aerosol generating product more complete and uniform. Specifically, the shortest distance between the inner tube portion 202 and the outer surface of the aerosol generating product is within 1 mm, preferably 0.5 mm. The cavity 204 of the heat insulation assembly 200 can reduce the heat transferred from the inner tube portion 202 to the outer tube portion 203. Thereby, the heat insulation assembly 200 also functions as a heat insulation function of the airflow heating assembly, eliminating the need to add other heat insulation measures or assemblies, which helps to reduce costs and simplify the structure.

[0047] In some embodiments, as shown in FIG. 9, the above heat insulation assembly 200 may be a single-layer tube, for example, a metal tube or a ceramic tube. Thereby, a part of the heat of the gas guide element 10 can be absorbed and utilized for heating the aerosol generating product. Thereby, not only can heat be quickly released, but also power consumption can be reduced.

[0048] The airflow heating assembly 100 according to an embodiment of the present application includes a gas guide element 10 provided with a first mounting cavity 12 inside and a plurality of through gas guide passages 11 for gas to flow through, and a heating element 20 provided in the first mounting cavity 12 and electrically connected to an external power source to heat the gas guide element 10 so that the gas flowing through the gas guide passages 11 is heated by the gas guide element 10. By providing the heating element 20 inside the gas guide element 10, the problem that the conventional heating element 20 is externally fitted to the outside of the gas guide element 10 and part of the heat is released to the outside can be effectively overcome, and the heating efficiency of the heating element 20 can be improved.

[0049] The present application further provides an embodiment of an aerosol generating device 1000. As shown in FIG. 8, the aerosol generating device 1000 is for generating an aerosol by heating an inserted aerosol generating product. The aerosol generating device 1000 includes a housing 200 and the above-described airflow heating assembly 100. The housing 200 is provided with a receiving cavity 201, and at least a part of the aerosol generating product is removably provided in the receiving cavity 201. The airflow heating assembly 100 is provided in the receiving cavity 201. Since the airflow heating assembly 100 is provided at an upstream position of the airflow of the aerosol generating product, the air passing through it is heated and then enters the inside of the aerosol generating product to heat the aerosol generating product. For the functions and structures of the airflow heating assembly 100, reference can be made to the above embodiments.

[0050] In some embodiments, the housing may be a heat-insulating member, or a heat-insulating member may be provided inside. For example, the heat-insulating member may be in a hollow cylindrical shape and may be made of a high-temperature resistant material such as a vacuum tube, a peak, or an aerogel. The heat-insulating member can reduce the transmission of the heat generated by the airflow heating assembly along the housing, and prevent the temperature of the area in contact with the user outside the airflow heating assembly from becoming too high and causing burns to the user.

[0051] The above is merely an example of the present application and does not limit the scope of the patent of the present application. Modifications of equivalent structures or equivalent processes made based on the content of the specification and drawings of the present application, or direct or indirect applications to other related technical fields of the content of the specification and drawings of the present application, shall all be similarly included in the scope of patent protection of the present application.

Claims

1. An air flow heating assembly for generating an aerosol by heating an aerosol generating product, comprising: a gas guide element provided with a first mounting cavity therein and a plurality of through gas guide passages for gas to flow through; a heating element provided in the first mounting cavity and electrically connected to an external power source so that the gas flowing through the gas guide passages is heated by the gas guide element, the heating element being for heating the gas guide element.

2. The air flow heating assembly according to claim 1, wherein the diameter D1 of the gas guide passage satisfies 0 < D1 ≤ 0.5 mm, or the diameter D2 of the first mounting cavity satisfies 0 mm < D2 ≤ 2.5 mm.

3. The air flow heating assembly according to claim 1, wherein the ratio of the sum of the cross-sectional areas of the plurality of gas guide passages to the cross-sectional area of the gas guide element is 1 / 5 or more, the cross-section of the gas guide passage and the cross-section of the gas guide element overlap, and both the cross-section of the gas guide passage and the cross-section of the gas guide element are perpendicular to the center line of the gas guide element.

4. The air flow heating assembly according to claim 1, wherein the plurality of gas guide passages are provided so as to surround the center of the gas guide element and form a plurality of circular shapes, and the distance between two adjacent gas guide passages on the same circumference is equal.

5. The air flow heating assembly according to claim 4, wherein the ratio of the number of gas guide passages on the inner circumference to the number of gas guide passages on the outer circumference is equal to the ratio of the radius of the inner circumference to the radius of the outer circumference.

6. The gas guide element has a cross-sectional area S1 of the gas guide element of 10 mm ２ ≤ S1 ≤ 50 mm ２ and the cross-section of the gas guide element is perpendicular to the center line of the gas guide element, or The air flow heating assembly according to claim 1, wherein at least one of the conditions that the axial length L1 of the gas guide element satisfies 5 mm ≤ L1 ≤ 10 mm is met.

7. The heating element has an area S2 enclosed by the outer contour of the cross-section of the heating element, where 0.7 mm ２ ≦ S2 ≦ 3.5 mm ２ and the cross-section of the gas guide element is perpendicular to the center line of the gas guide element. The air flow heating assembly according to claim 1, wherein at least one of the conditions that the axial length L2 of the heating element satisfies 4 mm ≤ L2 ≤ 9 mm is met.

8. The first mounting cavity is provided at the center of the gas guide element, penetrates the gas guide element, and The airflow heating assembly according to claim 1, characterized in that at least one of the first mounting cavities is a blind via.

9. The number of the heating elements is plural, the number of the first mounting cavities is plural, and the plural heating elements are provided in the plural first mounting cavities. The airflow heating assembly according to claim 1 is characterized by this.

10. The outer surface of the heating element and the inner surface of the first mounting cavity are provided so that at least a part thereof is in close contact. The airflow heating assembly according to claim 1 is characterized by this.

11. The heating element has a ventilation gap, The ventilation gap includes at least a first hollow groove and / or a plurality of concave grooves, The first hollow groove is provided inside the heating element, and at least the top penetrates to the gas guide element, or at least the top of the first hollow groove penetrates to the bottom of the aerosol generating product, or at least the side surface of the first hollow groove penetrates to the heating element, thereby forming a plurality of first through holes. The concave groove is provided on the outer peripheral surface of the heating element, and the concave groove forms a ventilation gap for the gas to flow together with the inner surface of the first mounting cavity. The airflow heating assembly according to claim 1 is characterized by this.

12. At least a part of the heating element is formed by a spiral heating wire, and a plurality of the ventilation gaps are formed by making the heating wire spiral. The airflow heating assembly according to claim 11 is characterized by this.

13. The cross-sectional shape of the heating wire is rectangular, and the cross-section of the heating wire is perpendicular to the stretching direction when the heating wire is stretched, or The airflow heating assembly according to claim 1, characterized in that the shape of the heating element is sheet-like.

14. An engaging portion is provided on the heating element, an engaging groove is provided on the inner surface of the first mounting cavity, and the heating element is engaged with the engaging groove of the first mounting cavity by the engaging portion, thereby being fixed in the first mounting cavity. The airflow heating assembly according to claim 1 is characterized by this.

15. The airflow heating assembly further includes a cover plate, and at least one of the gas guide element, the inner wall of the first mounting cavity, and / or the heating element is provided with an abutting portion for fixing the heating element in the first mounting cavity. The airflow heating assembly according to claim 1 is characterized in that.

16. The axial length of the heating element inserted into the first mounting cavity is at least 1 / 3 of the axial length of the gas guide element. The airflow heating assembly according to claim 1 is characterized in that.

17. The gas guide element includes a first gas guide block and a second gas guide block. The heating element is provided between the first gas guide block and the second gas guide block. The first gas guide block and the second gas guide block are The first gas guide block and the second gas guide block are provided vertically along the extending direction of the center line of the gas guide element. The first gas guide block and the second gas guide block are provided horizontally along a direction perpendicular to the extending direction of the center line of the gas guide element. A groove is provided in the first gas guide block, and the second gas guide block is fitted into the groove. The airflow heating assembly according to claim 1 is characterized in that it satisfies at least one of the following conditions.

18. The airflow heating assembly further includes a piercing type heating element provided at one end of the gas guide element. A first mounting cavity is provided in the gas guide element. The heating element is provided in the first mounting cavity. The piercing type heating element and the gas guide element are heated. The piercing type heating element is inserted into the aerosol generating product to heat the aerosol generating product. The airflow heating assembly according to claim 1 is characterized in that.

19. The piercing type heating element includes a piercing portion and a mounting portion. One end of the mounting portion is connected to the gas guide element, the piercing portion is provided at the other end of the mounting portion, a second mounting cavity is provided inside the mounting portion, the second mounting cavity communicates with the first mounting cavity, and the heating element is provided in the first mounting cavity and the second mounting cavity. The airflow heating assembly according to claim 18, characterized in that.

20. The airflow heating assembly according to claim 19, characterized in that ventilation holes are provided in the side wall of the piercing type heating element that contacts the aerosol generating product.

21. The gas guide element is made of graphite or a graphite alloy The airflow heating assembly according to claim 1, characterized in that.

22. Further comprising a heat insulation assembly connected to the gas guide element and having a receiving cavity provided inside for receiving the aerosol generating product, The heat insulation assembly includes an inner pipe portion and an outer pipe portion. The receiving cavity is provided inside the inner pipe portion, the outer pipe portion is provided surrounding the inner pipe portion, a cavity is formed between the outer pipe portion and the inner pipe portion by surrounding, and the inner pipe portion is in close contact with the aerosol generating product, or, The heat insulation assembly is a single-layer pipe, the inside of the single-layer pipe is in close contact with the aerosol generating product, and the single-layer pipe is a metal pipe or a ceramic pipe. The airflow heating assembly according to claim 1, characterized in that.

23. An airflow heating assembly for generating an aerosol by heating an aerosol generating product, A gas guide element provided with a first mounting cavity inside and a plurality of through gas guide passages for gas flow, A resistance heating element provided in the first mounting cavity, electrically connected to an external power source so that the gas flowing through the gas guide passage is heated by the gas guide element, and a heating element for heating the gas guide element. The airflow heating assembly, characterized in that the gas guide element is made of graphite or a graphite alloy.

24. An aerosol generating device for generating an aerosol by heating an aerosol generating product, A housing provided with a receiving cavity for removably providing the aerosol generating product therein, An airflow heating assembly according to any one of claims 1 to 23, provided at an upstream position of the airflow of the aerosol generating product so that the air passing through it is heated and then enters the aerosol generating product, provided in the receiving cavity, An aerosol generating device, characterized in that.

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