Aerosol-generating device

Abstract

The utility model relates to an aerosol generating device which comprises an air inlet structure and a heating tube. A containing cavity used for containing at least part of the aerosol generating product is formed in the heating pipe. The air inlet structure comprises a first air channel and a second air channel, one end of the second air passage is communicated with the bottom of the accommodating cavity, and the other end of the second air passage is communicated with the first air passage; and the buffer cavity is arranged at the intersection of the first air channel and the second air channel. The central axis of the second air channel and the central axis of the first air channel form an included angle, and the bottom wall face of the buffer cavity is lower than the bottom wall face of the first air channel. When flue gas flows back, the backflow flue gas flows downwards to the buffer cavity through the second gas channel, one part of the backflow flue gas is condensed in the buffer cavity and stored in the buffer cavity, so that backflow or overflow of the flue gas is reduced, in addition, the other part of the backflow flue gas flows upwards after encountering the bottom wall face of the buffer cavity, and vortex can be formed at the tail end of the buffer cavity; therefore, smoke is prevented from flowing out of the air inlet of the first air channel or slowed down.

Description

Technical Field

[0001] The utility model relates to the technical field of aerosol generation, and more specifically, to an aerosol generating device. Background Art

[0002] Aerosol-generating devices use heat to bake aerosol-generating products without burning them, producing an aerosol for inhalation. During use, smoke removal is crucial, and one of the key factors influencing smoke volume is the airway structure. However, existing airway structures often cause smoke backflow and escape from the airway inlet, as well as condensate deposition and difficulty in removal, impacting the user experience. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide an aerosol generating device which can slow down or prevent smoke backflow in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is to construct an aerosol generating device, comprising:

[0005] air intake structure; and

[0006] The heating tube has a receiving cavity formed therein for receiving at least part of the aerosol generating product.

[0007] The air intake structure comprises:

[0008] a first air passage having an air inlet at one end thereof;

[0009] a second air channel, one end of which is connected to the bottom of the accommodating cavity, and the other end of which is connected to the first air channel; and

[0010] A buffer chamber is provided at the intersection of the first airway and the second airway,

[0011] The central axis of the second air channel is arranged at an angle to the central axis of the first air channel, and the bottom wall surface of the buffer cavity is lower than the bottom wall surface of the first air channel.

[0012] In some embodiments, a guide slope is provided at the intersection of the buffer cavity and the first air channel, and an angle α between the guide slope and the bottom wall of the buffer cavity is 100° to 160°.

[0013] In some embodiments, the distance between the bottom wall of the buffer cavity and the central axis of the first air channel is 3 mm to 7 mm.

[0014] In some embodiments, the pore size of the second air channel is greater than or equal to the pore size of the first air channel.

[0015] In some embodiments, the aperture of the first air channel is 2.5 mm to 3.5 mm, and the aperture of the second air channel is 3 mm to 4 mm.

[0016] In some embodiments, an adsorbent is placed in the buffer cavity.

[0017] In some embodiments, an edge of the adsorption member is spaced apart from an edge of the bottom wall of the buffer cavity.

[0018] In some embodiments, the central axis of the first air channel and the central axis of the second air channel are perpendicular to each other, and the central axis of the second air channel is parallel to or coincides with the central axis of the accommodating cavity.

[0019] In some embodiments, the air intake structure is an integrally formed structure.

[0020] In some embodiments, the air intake structure is assembled from at least two structural components, and the buffer cavity is formed on one of the structural components.

[0021] In some embodiments, the air intake structure is assembled from three structural components: the first air duct, the second air duct, and the buffer cavity.

[0022] In some embodiments, the heat pipe comprises:

[0023] infrared-transparent substrate tube;

[0024] a heating layer, disposed on the outer wall of the base tube, for generating infrared light waves when energized; and

[0025] A protective layer is coated on the outside of the heating layer and the base tube, and the thermal conductivity of the protective layer is lower than the thermal conductivity of the base tube.

[0026] The implementation of the present invention has at least the following beneficial effects: when the flue gas refluxes, the reflux flue gas flows downward to the buffer chamber through the second air duct, and a portion of the reflux flue gas will condense into condensate in the buffer chamber and be stored in the buffer chamber, thereby reducing the overflow of the flue gas; in addition, a portion of the reflux flue gas will turn to flow upward after encountering the bottom wall of the buffer chamber, and will form a vortex at the end of the buffer chamber, thereby preventing or slowing down the outflow of flue gas from the air inlet of the first air duct, slowing down the reflux of flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0028] Figure 1 2 is a schematic diagram of the three-dimensional structure of the aerosol generating system in the first embodiment of the present utility model;

[0029] Figure 2 yes Figure 1 A schematic diagram of the longitudinal cross-sectional structure of the aerosol generating system shown;

[0030] Figure 3 yes Figure 2 Schematic diagram of the three-dimensional structure of the heating component;

[0031] Figure 4 yes Figure 3 A schematic diagram of the exploded structure of the heat generating component shown;

[0032] Figure 5 yes Figure 3 A schematic diagram of the longitudinal cross-sectional structure of the heating component shown;

[0033] Figure 6 yes Figure 5 Schematic diagram of the longitudinal cross-section structure of the middle base;

[0034] Figure 7 This is a schematic diagram of the longitudinal cross-sectional structure of the base in the second embodiment of the present utility model;

[0035] Figure 8 This is a schematic diagram of the longitudinal cross-sectional structure of the base in the third embodiment of the present utility model;

[0036] Figure 9 yes Figure 8 A schematic diagram of the exploded structure of the base shown;

[0037] Figure 10 This is a schematic diagram of the longitudinal cross-sectional structure of the base in the fourth embodiment of the present utility model;

[0038] Figure 11 This is a schematic diagram of the three-dimensional structure of the heating tube in the fifth embodiment of the present invention;

[0039] Figure 12 yes Figure 11 A schematic diagram of the longitudinal cross-sectional structure of the heating tube shown;

[0040] Figure 13 yes Figure 11 Schematic diagram of the enlarged structure at A in the middle;

[0041] Figure 14 It is a schematic diagram of the longitudinal cross-sectional structure of the heating tube in the sixth embodiment of the present utility model. DETAILED DESCRIPTION

[0042] In order to provide a clearer understanding of the technical features, objectives, and effects of the present invention, a specific embodiment of the present invention will now be described in detail with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly defined. In addition, in the present invention, unless otherwise clearly defined and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0044] In the description of the present invention, terms such as "air inlet end", "air outlet end", "starting end", "end end", "inlet end", and "outlet end" are defined by the flow direction of the airflow. The end where the airflow flows in is the "air inlet end", "starting end" or "inlet end", and the end where the airflow flows out is the "air outlet end", "end end" or "outlet end".

[0045] Figures 1 to 2 The aerosol-generating system 300 of the first embodiment of the present invention is shown. The aerosol-generating system 300 may include an aerosol-generating device 100 and an aerosol-generating article 200. The aerosol-generating article 200 can be removably inserted into the aerosol-generating device 100, allowing for easy removal and replacement of the aerosol-generating article 200 for continued use after heating. When powered on, the aerosol-generating device 100 can heat the inserted aerosol-generating article 200, releasing the aerosol extract in the aerosol-generating article 200 without burning it.

[0046] In some embodiments, the aerosol-generating article 200 may be cylindrical. Of course, in other embodiments, the aerosol-generating article 200 may also be in other cylindrical shapes, such as an elliptical cylinder or a polygonal cylinder. The aerosol-generating article 200 may include a solid material in the form of strips, sheets, or granules, made from leaves and / or stems of plants (e.g., tobacco or tea leaves), and an aroma component may be further added to the solid material.

[0047] The aerosol generating device 100 may include a housing 10, and a heating component 20, a circuit board 30, and a battery disposed within the housing 10. The circuit board 30 is electrically connected to the heating component 20 and the battery, respectively. The circuit board 30 is provided with a control circuit for controlling the power supply of the battery to the heating component 20.

[0048] The housing 10 includes a sidewall 12, and a top wall 11 and a bottom wall 13 disposed at either end of the sidewall 12. The sidewall 12 may be in the shape of a square cylinder, but in other embodiments, it may also be in other cylindrical shapes, such as a circular cylinder or an elliptical cylinder. The top wall 11 and the bottom wall 13 respectively cover the upper and lower openings of the sidewall 12.

[0049] A socket 110 is provided through the top wall 11. A receiving cavity 210 is formed within the heating assembly 20 for accommodating at least a portion of the aerosol-generating article 200. The aerosol-generating article 200 can be at least partially inserted into the receiving cavity 210 via the socket 110 for heating. When energized, the heating assembly 20 generates heat, thereby heating the aerosol-generating article 200 accommodated therein. The heating method employed by the heating assembly 20 is not limited; for example, it may employ one or more of resistance heating, electromagnetic heating, infrared heating, laser heating, microwave heating, and the like.

[0050] The side wall 12 of the housing 10 is provided with an air inlet 120 for allowing external air to enter the accommodating cavity 210. The number of the air inlet 120 is not limited, and there can be one or more air inlet holes.

[0051] like Figures 2 to 6 As shown, the heating assembly 20 may include a support assembly 29 and a heating tube 21. The inner wall of the heating tube 21 defines a receiving cavity 210. The heating tube 21 is fixed to the housing 10 via the support assembly 29. One end of the support assembly 29 (the upper end in the figure) has an opening 290. The opening 290 is coaxially connected to the receiving cavity 210, and the aerosol-generating article 200 can be inserted into the receiving cavity 210 through the opening 290.

[0052] In some embodiments, the air inlet end of the air inlet structure 240 is in communication with the air inlet hole 120, and the air outlet end of the air inlet structure 240 is in communication with the lower end of the accommodating chamber 210 (i.e., the end away from the opening 290). When the aerosol-generating article 200 is inserted into the accommodating chamber 210, external airflow can flow along the air inlet structure 240 into the bottom of the aerosol-generating article 200. The medium in the aerosol-generating article 200 is heated to generate an aerosol. Under the negative pressure applied by the user's inhalation, the smoke is inhaled by the user.

[0053] In some embodiments, the support assembly 29 may include a sleeve 23 and a base 24 disposed at the lower end of the sleeve 23. The sleeve 23 is a through-hole structure, and its inner side forms a cavity 2310 for accommodating the heating pipe 21. An opening 290 is formed at the upper end of the sleeve 23. The base 24 is disposed at the lower end of the sleeve 23 and covers the lower opening of the sleeve 23. An air intake structure 240 is formed within the base 24.

[0054] In some embodiments, the air intake structure 240 may include a first air channel 241, a second air channel 242, and a buffer chamber 243. The first air channel 241 has an air inlet at one end and is connected to the outside atmosphere through the air inlet. The second air channel 242 is connected to the bottom of the accommodating chamber 210 at one end and to the first air channel 241 at the other end. When a user inhales, the outside air can enter the accommodating chamber 210 through the first air channel 241 and the second air channel 242 in sequence.

[0055] The buffer chamber 243 is disposed at the intersection of the first air channel 241 and the second air channel 242 and is in communication with both. Located below the accommodating chamber 210, the second air channel 242, and the first air channel 241, the buffer chamber 243 is capable of accommodating condensate formed after inhalation of the aerosol-generating article 200. In some embodiments, the buffer chamber 243 may be offset from the flow path of the inlet airflow through the first air channel 241 and the second air channel 242 to prevent the airflow from directly carrying away condensate during inhalation, thereby affecting the inhalation experience.

[0056] When the flue gas refluxes, it flows downward into the buffer chamber 243 via the second airway 242. A portion of the refluxed flue gas condenses into condensate in the buffer chamber 243 and is stored there, thereby reducing flue gas reflux or overflow. Furthermore, a portion of the refluxed flue gas, upon encountering the bottom wall 2430 of the buffer chamber 243, turns upward and forms a vortex in the buffer chamber 243, thereby preventing or slowing the flow of flue gas out of the air inlet of the first airway 241 and slowing down the reflux of flue gas. It should be noted that, based on the axial direction of the accommodating chamber 210, the side closest to the opening 290 is the top or upper side, and the side away from the opening 290 is the bottom or lower side.

[0057] Specifically, the second air channel 242 is axially disposed at the lower end of the accommodating chamber 210. The second air channel 242 and the accommodating chamber 210 may both be cylindrical, and the central axis of the second air channel 242 may coincide with the central axis of the accommodating chamber 210. Of course, in other embodiments, the second air channel 242 and / or the accommodating chamber 210 may also be in other shapes, such as a polygonal column or an elliptical column. In other embodiments, the central axis of the second air channel 242 may also be parallel to the central axis of the accommodating chamber 210, or the central axis of the second air channel 242 may also form a certain angle with the central axis of the accommodating chamber 210.

[0058] The first air channel 241 may be cylindrical, and the central axis of the first air channel 241 may be perpendicular to the central axis of the second air channel 242. Of course, in other embodiments, the first air channel 241 may also be in other shapes, such as a polygonal column or an elliptical column. In other embodiments, the central axis of the first air channel 241 may form a certain angle with the central axis of the second air channel 242.

[0059] The buffer chamber 243 extends downward from the intersection of the first airway 241 and the second airway 242. The bottom wall 2430 of the buffer chamber 243 is lower than the bottom wall 2412 of the first airway 241. A guide slope 2431 is provided at the intersection of the buffer chamber 243 and the first airway 241 to guide the reflowing smoke. The smoke reflowing from the second airway 242 rises along the guide slope 2431, forming a vortex at the end of the buffer chamber 243, thereby preventing the smoke from flowing out of the air inlet of the first airway 241 and slowing the reflow of the smoke.

[0060] It should be noted that the bottom wall surface 2430 and the bottom wall surface 2412 are defined when the device is in normal use or normal placement. Alternatively, the bottom wall surface 2430 and the bottom wall surface 2412 can also be understood as the wall surface of the buffer cavity 243 and the first air channel 241, respectively, that is away from the accommodating cavity 210 in the axial direction of the accommodating cavity 210.

[0061] The buffer chamber 243 may include a first portion 243a and a second portion 243b arranged side by side in a transverse direction. The second portion 243b extends axially downward from a portion of the peripheral wall surface of the second air passage 242. The second portion 243b may have an arc-shaped cross section, and the diameter of the second portion 243b is equal to the diameter of the second air passage 242, so that the second portion 243b is smoothly connected to the second air passage 242.

[0062] The first portion 243a extends downward from the end of the first air channel 241. The cavity wall of the first portion 243a includes a guide slope 2431 and two side walls 2432 located on both sides of the guide slope 2431. The guide slope 2431 is set at an angle to the bottom wall 2430 of the buffer cavity 243. The upper end of the guide slope 2431 is inclined toward the air inlet end of the first air channel 241. The two side walls 2432 are perpendicular to the bottom wall 2430 of the buffer cavity 243, so that the first portion 243a is a trapezoidal column with a cross-sectional area that gradually increases from bottom to top. Furthermore, the two side walls 2432 can be tangent to the radial sides of the first air channel 241 respectively, so that the connection between the two side walls 2432 and the first air channel 241 is smooth and does not hinder the flow of air. Of course, in other embodiments, the side wall surface 2432 may also be an inclined surface, that is, the side wall surface 2432 is not perpendicular to the bottom wall surface 2430 .

[0063] The bottom wall 2430 of the buffer chamber 243 is a horizontal plane. That is, the bottom wall 2430 is perpendicular to the central axis of the second airway 242 and parallel to the central axis of the first airway 241. The distance L between the bottom wall 2430 and the central axis of the first airway 241 can be 3 mm to 7 mm (inclusive), preferably 4.5 mm, 5 mm, or 5.5 mm. Within this range, the buffer chamber 243 has sufficient accommodation space and can form a suitable vortex at the end of the buffer chamber 243.

[0064] The length of the bottom wall 2430 (i.e., the length W of the bottom wall 2430) can be 1 to 2 times, preferably about 1.5 times, the diameter d2 of the second air channel 242. The length of the bottom wall 2430 is substantially parallel to the direction of the return airflow at the bottom wall 2430 and parallel to the axial direction of the first air channel 241.

[0065] The angle α between the guide slope 2431 and the bottom wall 2430 can be 100° to 160° (inclusive), for example, the angle α is about 120°, 135°, or 150°. When the angle α is set to 100° to 160°, on the one hand, the deflection angle of the return airflow when flowing along the bottom wall 2430 toward the guide slope 2431 is smaller (the deflection angle is the supplementary angle of α), and the return airflow can be more smoothly turned to flow toward the guide slope 2431. On the other hand, the return airflow flowing upward along the guide slope 2431 can better form a vortex under the obstruction of the upper side wall of the first air duct 241, thereby preventing smoke from flowing out of the air inlet of the first air duct 241.

[0066] like Figure 5 、 Figure 6 As shown, after the inhalation is completed, the smoke generates a reflux, and the refluxed smoke flows downward through the second air duct 242, turns after encountering the bottom wall surface 2430 of the buffer chamber 243, climbs upward along the guide slope 2431, and then is blocked by the upper side wall of the first air duct 241 to form a vortex, thereby preventing the smoke from flowing out from the air inlet of the first air duct 241, slowing down the smoke reflux, and improving the user experience.

[0067] The aperture d2 of the second air passage 242 may be slightly larger than the aperture d1 of the first air passage 241. That is, the cross-sectional area of ​​the second air passage 242 is larger than the cross-sectional area of ​​the first air passage 241. In this way, during inhalation, all air entering through the first air passage 241 can be drawn out through the second air passage 242, and the vortex generated during backflow can also be drawn out through the second air passage 242. Of course, in other embodiments, the cross-sectional area of ​​the second air passage 242 may be equal to or smaller than the cross-sectional area of ​​the first air passage 241.

[0068] In some embodiments, the aperture d1 of the first air channel 241 may be 2.5 mm to 3.5 mm (inclusive), preferably 3 mm. The aperture d2 of the second air channel 242 may be 3 mm to 4 mm (inclusive), preferably 3.5 mm.

[0069] The air intake structure 240 can be an integrally formed structure, which helps reduce the number of assembly steps and does not produce assembly gaps due to assembly. Of course, the air intake structure 240 can also be assembled from at least two structural parts, and the buffer chamber 243 is formed on one of the structural parts for easy replacement. In some embodiments, the buffer chamber 243 is composed of two detachable structural parts, which is easy to disassemble and clean. Alternatively, the air intake structure 240 is assembled from three structural parts: the first air duct 241, the second air duct 242, and the buffer chamber 243.

[0070] For example Figures 4 and 5 As shown, in some embodiments, the heat pipe 21 may include a base tube 211 and a heat-generating layer 212 disposed on the base tube 211. The base tube 211 may be in the shape of a circular tube with two through ends, and its inner wall defines a receiving cavity 210. The heat-generating layer 212 may be disposed on the outer surface and / or inner surface of the base tube 211. It is connected to the control circuit and is configured to generate heat when energized to heat the aerosol-generating article 200 inserted into the base tube 211. Preferably, the heat-generating layer 212 is disposed on the outer surface of the base tube 211 to facilitate processing and manufacturing.

[0071] In some embodiments, the heating layer 212 may be a film structure, which may include an infrared film 213 and a resistive heating circuit 214 disposed on the outer surface of the base tube 211. When connected to a power source, the resistive heating circuit 214 generates heat, which is then transferred to the base tube 211. The base tube 211 then transfers the heat to the infrared film 213. Alternatively, the resistive heating circuit 214 directly transfers the heat to the infrared film 213. When heated, the infrared film 213 generates infrared light waves, which are transmitted through the base tube 211 and absorbed by the aerosol-generating article 200 inserted therein, thereby heating the aerosol-generating article 200. Furthermore, the base tube 211 can also heat the aerosol-generating article 200 in contact therewith through heat conduction. Accordingly, the base tube 211 may be made of a material that is transparent to infrared light waves, such as transparent ceramic or quartz. In addition, the base tube 211 also has a relatively high thermal conductivity (eg, thermal conductivity greater than or equal to 10 W / mK, preferably greater than or equal to 30 W / mK) so as to better transfer heat.

[0072] In some embodiments, the base tube 211 may be a ceramic tube made of a ceramic material with a high thermal conductivity. The ceramic materials that may be used for the base tube 211 include one or more of aluminum oxide, spinel, yttrium oxide, zirconium oxide, magnesium oxide, beryllium oxide, gallium arsenide, zinc sulfide, zinc selenide, magnesium fluoride, and calcium fluoride. For example, the base tube 211 may be made of aluminum oxide, wherein the aluminum oxide has a purity greater than or equal to 99% and a density greater than or equal to 99% (density = measured density / true density*100%).

[0073] In some embodiments, the transmittance of the base tube 211 to infrared light with a wavelength of 0 to 6.5 μm is greater than or equal to 50%. After heating, the base tube 211 can radiate infrared light waves with a wavelength of 8 to 11 μm.

[0074] The infrared film 213 can be coated, covered, or printed on the outer side of the base tube 211. The infrared film 213 evenly covers the entire outer side of the base tube 211. The resistive heating circuit 214 can be provided on the infrared film 213 and can be formed on the infrared film 213 by coating or printing.

[0075] In some embodiments, the heating layer 212 further includes at least one conductive film 215 connected to the resistive heating circuit 214. The conductive film 215 is disposed on the outer side of the base tube 211 and is used to connect the resistive heating circuit 214 to an external power source. Typically, there are two conductive films 215, one connected to each end of the resistive heating circuit 214. In some embodiments, the conductive film 215 can be printed and laminated onto the resistive heating circuit 214. The conductive film 215 and the resistive heating circuit 214 at least partially overlap, thereby ensuring reliable electrical contact.

[0076] Furthermore, the heating component 20 also includes at least one electrode 217 connected to the conductive film 215. There are typically two electrodes 217, one end of each of which is connected to the two conductive films 215, and the other end is connected to an external power source. The electrode 217 may be an electrode lead, one end of which may be welded to the conductive film 215. In other embodiments, the electrode 217 may also be an electrode sheet or an electrode column, which may be electrically connected to the conductive film 215 through contact.

[0077] Of course, in other embodiments, the infrared film 213 and / or the resistive heating circuit 214 may also be disposed on the inner surface of the base tube 211. For example, the resistive heating circuit 214 may be disposed on the outer surface of the base tube 211, while the infrared film 213 may be disposed on the inner surface of the base tube 211. In this case, the base tube 211 only needs to have a high thermal conductivity and does not need to be light-transmissive. In another example, the resistive heating circuit 214 may be disposed on the inner surface of the base tube 211, while the infrared film 213 may be disposed on the outer surface of the base tube 211. In another example, both the infrared film 213 and the resistive heating circuit 214 may be disposed on the inner surface of the base tube 211.

[0078] In other embodiments, the heating layer 212 may also be a conventional infrared heating film that actively generates heat and radiates infrared light when powered on. The infrared heating film may be provided on the outer surface and / or inner surface of the base tube 211 .

[0079] The sleeve 23 may include a cylindrical body 231 and an extension portion 232 disposed at the upper end of the cylindrical body 231. The cylindrical body 231 and the extension portion 232 may be coaxially arranged, but are not limited to a coaxial arrangement. The inner wall surface of the cylindrical body 231 defines a cavity 2310, and the inner wall surface of the extension portion 232 defines an insertion hole 2320. The aerosol-generating article 200 can be inserted into the heating tube 21 through the insertion hole 2320.

[0080] In some embodiments, both the barrel 231 and the extension 232 may be tubular, with the inner and outer diameters of the barrel 231 being larger than those of the extension 232, respectively. The larger inner diameter of the barrel 231 allows the cavity 2310 formed therein to have a larger receiving space. The diameter of the cavity 2310 is larger than that of the insertion hole 2320, thereby forming an end surface at the upper end of the cavity 2310 against which the upper end of the heating tube 21 can rest.

[0081] The base 24 is an integrally molded structure. It includes a base body 244, an airway portion 245 extending from the lower end surface of the base body 244, and a first annular portion 246 and a second annular portion 247 extending upward from the upper end surface of the base body 244. The airway portion 245 is used to form the air intake structure 240. The outer diameter of the base body 244 is consistent with the outer diameter of the cylinder 231. The first annular portion 246 is embedded in the lower end opening of the cylinder 231 and can be fixed to the cylinder 231 by means of an interference fit, a snap fit, a threaded fit, or adhesive bonding.

[0082] The second annular portion 247 is located inside the first annular portion 246. The outer wall of the second annular portion 247 and the inner wall of the first annular portion 246 may be spaced apart, and the annular space 2460 formed therebetween can serve as a heat insulator.

[0083] The upper end surface of the second annular portion 247 also extends upward to form at least two clamping arms 248. These at least two clamping arms 248 are spaced apart circumferentially around the second annular portion 247 to secure the lower end of the heating tube 21. Securing the heating tube 21 with the clamping arms 248 can reduce the contact area between the heating tube 21 and the base 24, facilitating thermal insulation. Of course, in other embodiments, the base 24 may not be provided with the clamping arms 248, and the heating tube 21 may be directly embedded in the second annular portion 247 for securement.

[0084] In some embodiments, the heating assembly 20 may further include a reflective cover 22, which may be disposed in the cavity 2310 and surround the outer circumference of the heating tube 21 to reflect the thermal radiation emitted by the heating tube 21. This, on the one hand, reduces the amount of heat transferred to the sleeve 23, thereby improving the thermal insulation effect of the aerosol generating device 100, and on the other hand, reduces thermal radiation loss, thereby improving the energy efficiency of the heating tube 21. The lower end of the reflective cover 22 may be sleeved outside the second annular portion 247 to achieve installation and fixation of the reflective cover 22.

[0085] The shape of the reflector 22 is not limited; for example, it can be a polygonal tube or a circular tube, among other shapes. The reflector 22 can be spaced apart from the heat pipe 21 to reduce heat transfer from the heat pipe 21 to the reflector 22. The reflector 22 can also be spaced apart from the sleeve 23, providing thermal insulation through the cavity. Of course, in other embodiments, thermal insulation can be achieved by filling the space between the reflector 22 and the heat pipe 21 and / or between the reflector 22 and the sleeve 23 with an insulating material such as aerogel.

[0086] Furthermore, at least one end of the heating tube 21 may be provided with a heat insulation structure to reduce the heat transferred from the heating tube 21 to the sleeve 23 and / or the base 24, thereby reducing heat loss and improving energy efficiency.

[0087] Specifically, a first thermal insulation structure is provided at the upper end of the heating tube 21. This first thermal insulation structure includes a first thermal insulation member 25. The first thermal insulation member 25 can be annular and can be coaxially arranged with the heating tube 21. The upper end surface of the heating tube 21 abuts against the top wall of the cylinder 231 via the first thermal insulation member 25, thereby achieving thermal insulation between the heating tube 21 and the sleeve 23.

[0088] The first thermal insulator 25 can be made of a thermally insulating material with low thermal conductivity (e.g., thermal conductivity less than or equal to 2.07 W / mK) and high temperature resistance. In some embodiments, the first thermal insulator 25 can be made of insulating ceramic, such as zirconia ceramic. Of course, in other embodiments, the first thermal insulator 25 can also be made of other insulating materials such as aerogel and aerosol glue.

[0089] In some embodiments, an annular inner flange 2311 is formed on the inner side of the top wall of the barrel 231, and the first thermal insulation member 25 is at least partially disposed within the inner flange 2311. The outer diameter of the inner flange 2311 is smaller than the inner diameter of the barrel 231, so that the inner flange 2311 is spaced apart from the side wall of the barrel 231, which facilitates thermal insulation.

[0090] The first thermal insulation member 25 may include a main body 251 and a sleeve portion 252 extending downward from an end surface of the main body 251. The main body 251 is disposed within the inner flange 2311, and the main body 251 and the inner flange 2311 are sealed together to reduce or prevent aerosol generated by the aerosol-generating article 200 inserted into the accommodating cavity 210 from leaking through the gap between the main body 251 and the inner flange 2311.

[0091] In some embodiments, the first thermal insulation structure further includes a first sealing member 26 disposed between the main body 251 and the inner flange 2311 to improve the sealing effect. The material of the first sealing member 26 preferably has high temperature resistance, thermal insulation, and sealing properties. In some embodiments, the first sealing member 26 can be made of thermal insulation silicone.

[0092] The sleeve portion 252 is annular and sleeved on the upper end of the heating tube 21. The inner diameter of the sleeve portion 252 is larger than the inner diameter of the main body 251, so that the upper end surface of the heating tube 21 can abut against the lower end surface of the main body 251.

[0093] The upper end of the reflector 22 is sleeved onto the outer surface of the sleeve portion 252. The inner wall surface of the upper end of the reflector 22 and the outer wall surface of the sleeve portion 252 may be at least partially in contact or may not be in contact at all. In this embodiment, the sleeve portion 252 is annular, and the reflector 22 is a regular polygonal cylindrical shape. The outer diameter of the sleeve portion 252 may be approximately equal to the diameter of the inscribed circle of the reflector 22, so that the sleeve portion 252 and the reflector 22 are partially in contact and partially spaced apart. This not only ensures the installation and fixation of the reflector 22, but also facilitates thermal insulation between the sleeve portion 252 and the reflector 22. Of course, in other embodiments, the outer diameter of the sleeve portion 252 may also be smaller than the diameter of the inscribed circle of the reflector 22.

[0094] The lower end of the heating tube 21 is provided with a second thermal insulation structure, which includes a second thermal insulation member 28. The lower end surface of the heating tube 21 abuts against the base 24 via the second thermal insulation member 28, thereby achieving thermal insulation between the heating tube 21 and the base 24. The second thermal insulation member 28 can be made of a high-temperature resistant material with low thermal conductivity. In some embodiments, the second thermal insulation member 28 can be made of thermally insulating silicone (preferably a vapor-phase silicone with a temperature resistance greater than 320°C).

[0095] In some embodiments, the second thermal insulation structure further includes a support member 27. The lower end surface of the heating tube 21 abuts against the support member 27 via a second thermal insulation member 28, and further abuts against the base 24 via the support member 27. The second thermal insulation member 28 can be annular and sealingly sleeved between the outer wall of the support member 27 and the inner wall of the second annular portion 247.

[0096] The support member 27 may be annular and have a vent hole 270 extending therethrough. Airflow entering through the second air inlet duct 2422 can enter the accommodating chamber 210 through the vent hole 270. The second air inlet duct 2422, the vent hole 270, and the accommodating chamber 210 may be coaxially arranged from bottom to top. The support member 27 has an end wall 271, which is formed annularly by the vent hole 270. The lower end of the aerosol-generating article 200 may rest against the end wall 271. It is understood that in other embodiments, the end wall 271 may be provided with multiple vent holes 270.

[0097] The support member 27 can be made of a heat-insulating material with low thermal conductivity and high temperature resistance, such as insulating ceramic. Of course, in other embodiments, the support member 27 can also be made of other heat-insulating materials such as aerogel and aerosol-phase adhesive. In other embodiments, the support member 27 may not be provided, and the lower end of the aerosol-generating article 200 may directly rest against the base 24.

[0098] Figure 7 The base 24 of the second embodiment of the present invention is shown. The main difference between the base 24 and the first embodiment is that an adsorption member 2433 is provided in the buffer cavity 243 of the base 24 for absorbing condensate collected in the buffer cavity 243. The adsorption member 2433 can also be replaced regularly to continue absorbing condensate.

[0099] The adsorbent 2433 is a porous structure, and the porous structure inside it can absorb and store a certain amount of condensate. Preferably, the adsorbent 2433 is a liquid-absorbing cotton. The adsorbent 2433 is placed at the bottom of the buffer cavity 243, and the edge of the adsorbent 2433 and the edge of the bottom wall 2430 of the buffer cavity 243 have a certain interval d3. On the one hand, it is convenient for the adsorbent 2433 to be assembled into the buffer cavity 243, and on the other hand, it can provide the liquid-absorbing cotton with expansion space after absorbing liquid. Of course, the interval d3 should not be too large to avoid the adsorbent 2433 being too small and affecting its liquid storage capacity. In some embodiments, the interval d3 between the edge of the adsorbent 2433 and the edge of the bottom wall 2430 may be greater than 0 and less than or equal to 1.5 mm, preferably 0.1 mm to 0.5 mm.

[0100] Figures 8 and 9The third embodiment of the present invention shows a base 24. The main difference between this embodiment and the first embodiment is that this base 24 is a split structure, comprising a first structural member 24a and a second structural member 24b. The air intake structure is partially formed in the first structural member 24a and partially formed in the second structural member 24b. The connection between the first structural member 24a and the second structural member 24b can be detachable or non-detachable. The first and second structural members 24a, 24b can be connected integrally by bonding, screwing, or snap-fitting, thereby forming the base 24.

[0101] Specifically, in this embodiment, the base 24 is formed by a first structural member 24a and a second structural member 24b joined together. A buffer chamber 243 is formed within the second structural member 24b, and a second air passage 242 is formed within the first structural member 24a. The first air passage 241 is partially formed within the first structural member 24a and partially within the second structural member 24b.

[0102] The joining surface of the first structural member 24a and the second structural member 24b can be a plane, which can better fit together and help ensure the sealing of the assembled air intake structure. In this embodiment, the joining surface of the first structural member 24a and the second structural member 24b is a horizontal plane located at the central axis of the first air channel 241.

[0103] In addition, in this embodiment, an adsorption member 2433 is also provided at the bottom of the buffer cavity 243 . The structure of the adsorption member 2433 can refer to the relevant description in the above-mentioned second embodiment and will not be repeated here.

[0104] Figure 10 The base 24 in the fourth embodiment of the present invention is shown. The main difference between the base 24 in the fourth embodiment and the first embodiment is that in the fourth embodiment, a plurality of air inlet holes 2410 are provided at the air inlet of the first air channel 241 .

[0105] Specifically, the air inlet of the first air duct 241 is covered with an end wall 2411, and a plurality of air inlet holes 2410 are provided through the end wall 2411. The plurality of air inlet holes 2410 can be evenly spaced in the circumferential direction and / or radial direction of the end wall 2411. The plurality of air inlet holes 2410 can reduce the air flow velocity, which helps to reduce the occurrence of smoke backflow.

[0106] Figures 11 to 13 The fifth embodiment of the present invention shows a heat pipe 21. The main difference between the heat pipe 21 in the first embodiment and the heat pipe 21 in this embodiment is that the heat pipe 21 in this embodiment further includes a protective layer 216 disposed on the base tube 211. The heat-generating layer 212 is at least partially located between the protective layer 216 and the base tube 211. The thickness of the protective layer 216 is smaller than that of the base tube 211, and the thermal conductivity of the protective layer 216 is lower than that of the base tube 211.

[0107] The protective layer 216 enhances the mechanical strength of the base tube 211 (especially the mechanical strength of a base tube 211 with a smaller thickness), thermal stability, and dielectric strength. It also enhances the aesthetics of the heat pipe 211, facilitates cleaning, and resists corrosion. In some embodiments, the ratio of the thermal conductivity of the base tube 211 to the thermal conductivity of the protective layer 216 is greater than or equal to 6. The thermal conductivity of the protective layer 216 is less than or equal to 1.5 W / mK.

[0108] Furthermore, the provision of protective layer 216 facilitates the thinning of base tube 211, thereby reducing the heat capacity of base tube 211, increasing the heating rate, and thus reducing energy consumption. Furthermore, the thinning of base tube 211 increases the transmittance of infrared light, further improving energy efficiency. It also facilitates the miniaturization of heating element 20, and consequently, the miniaturization of the entire aerosol generating device 100. In some embodiments, the thickness of base tube 211 is less than or equal to 0.8 mm.

[0109] Furthermore, the infrared transmittance of the protective layer 216 is low, thereby reducing the outward transmission of infrared light waves. In some embodiments, the infrared light emissivity of the protective layer 216 for wavelengths of 1 to 10 μm is less than or equal to 0.5, thereby reducing energy consumption.

[0110] In some embodiments, the protective layer 216 may cover the entire outer surface of the base tube 211 and may cover the upper and lower end surfaces of the base tube 211. By covering the entire outer surface of the base tube 211 with the protective layer 216, the entire heating layer 212 is covered in the protective layer 216, thereby preventing the heating layer 212 from being corroded by the outside, enhancing the corrosion resistance of the heating component 20, and preventing fouling, which is beneficial for cleaning the heating component 20. In addition, it can also block or slow down the heat transferred outward from the outer surface of the base tube 211. By covering the upper and lower end surfaces of the base tube 211 with the protective layer 216, it can block or slow down the heat transferred outward from the upper and lower end surfaces of the base tube 211, thereby reducing heat loss and improving energy efficiency. In addition, it can also simplify the process, and the end surface of the base tube 211 does not need to be deliberately protected.

[0111] Of course, in other embodiments, the protective layer 216 may only cover the outer surface of the base tube 211 and one end surface of the base tube 211 , or the protective layer 216 may only cover the outer surface of the base tube 211 .

[0112] The protective layer 216 and the base tube 211 can form an integral structure to improve the structural stability of the heating tube 21. Specifically, the protective layer 216 can be a glass glaze, which can be formed into an integral structure with the base tube 211 through calcination. It should be noted that glaze is a continuous glassy layer attached to the surface of the ceramic body, or a mixed layer of glass and crystals. It is made by grinding mineral raw materials (quartz) and raw materials in a certain proportion to make a glaze slurry, applying it to the surface of the body, and calcining it at a certain temperature. Of course, in some other embodiments, the protective layer 216 is not limited to glass glaze.

[0113] Figure 14 A heating tube 21 in a sixth embodiment of the present invention is shown. The main difference between the sixth embodiment and the fifth embodiment is that, in this embodiment, an infrared film 213 is arranged on the inner surface of a base tube 211, a resistance heating circuit 214 is arranged on the outer surface of the base tube 211, and a protective layer 216 covers the resistance heating circuit 214 and the outer surface of the base tube 211.

[0114] The working principle of the heating tube 21 is as follows: the resistance heating circuit 214 is connected to the power supply through the electrode 217. The resistance heating circuit 214 generates heat under the action of the current. The heat is transferred to the base tube 211 and then to the infrared film 213. The infrared film 213 is heated to generate infrared light waves. The infrared light waves are absorbed by the aerosol generating article 200 inserted into the base tube 211, thereby heating the aerosol generating article 200.

[0115] In this embodiment, since the infrared film 213 is disposed on the inner surface of the base tube 211, the base tube 211 only needs to have a high thermal conductivity and does not need to be transparent to infrared light waves. Furthermore, the base tube 211 can have a low infrared transmittance, thereby reducing the outward transmission of infrared light waves.

[0116] It can be understood that the above technical features can be used in any combination without limitation.

[0117] The above embodiments only express the specific implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An aerosol generating device, characterized in that include: air intake structure (240); as well as A heating tube (21) is formed with a receiving cavity (210) for receiving at least a portion of the aerosol generating product (200). The air intake structure (240) includes: a first air passage (241) having an air inlet at one end; a second air channel (242), one end of which is connected to the bottom of the accommodating cavity (210), and the other end of which is connected to the first air channel (241); and The buffer chamber (243) is provided at the intersection of the first air channel (241) and the second air channel (242). The central axis of the second air channel (242) is arranged at an angle to the central axis of the first air channel (241), and the bottom wall surface (2430) of the buffer cavity (243) is lower than the bottom wall surface (2412) of the first air channel (241).

2. The aerosol generating device according to claim 1, wherein A flow guiding slope (2431) is provided at the intersection of the buffer cavity (243) and the first air channel (241), and an included angle α between the flow guiding slope (2431) and the bottom wall surface (2430) of the buffer cavity (243) is 100° to 160°.

3. The aerosol generating device according to claim 1, wherein The distance between the bottom wall surface (2430) of the buffer cavity (243) and the central axis of the first air channel (241) is 3 mm to 7 mm.

4. The aerosol generating device according to claim 1, wherein The aperture of the second air channel (242) is greater than or equal to the aperture of the first air channel (241).

5. The aerosol generating device according to claim 1, wherein: The aperture of the first air channel (241) is 2.5 mm to 3.5 mm, and the aperture of the second air channel (242) is 3 mm to 4 mm.

6. The aerosol generating device according to claim 1, wherein: An adsorption element (2433) is placed in the buffer cavity (243).

7. The aerosol generating device according to claim 6, wherein: The edge of the adsorption member (2433) is spaced apart from the edge of the bottom wall surface (2430) of the buffer cavity (243).

8. The aerosol generating device according to claim 1, wherein The central axis of the first air channel (241) and the central axis of the second air channel (242) are perpendicular to each other, and the central axis of the second air channel (242) is parallel to or coincides with the central axis of the accommodating cavity (210).

9. The aerosol generating device according to claim 1, wherein: The air intake structure (240) is an integrally formed structure, or, The air intake structure (240) is assembled from at least two structural members, and the buffer cavity (243) is formed on one of the structural members, or, The air intake structure (240) is assembled from three structural components: the first air channel (241), the second air channel (242), and the buffer chamber (243).

10. The aerosol generating device according to any one of claims 1 to 9, characterized in that: The heating pipe (21) comprises: an infrared-transparent substrate tube (211); a heating layer (212), disposed on the outer wall of the base tube (211), and configured to generate infrared light waves when energized; and A protective layer (216) is coated on the outside of the heating layer (212) and the base tube (211), and the thermal conductivity of the protective layer (216) is lower than the thermal conductivity of the base tube (211).

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