Heating assembly and aerosol generating device

Abstract

The invention discloses a heating assembly and an aerosol generating device. The heating assembly comprises a cylindrical shell and a heating piece. A cavity for accommodating an aerosol generating substrate is defined by the shell, and the heating piece is arranged in the cavity; flow guide structures are arranged on the inner side wall of the shell, each flow guide structure comprises at least two flow guide sections, each flow guide section comprises a first end and a second end, and the first end of each flow guide section is closer to the inner bottom wall than the second end of the flow guide section; at least two flow guide sections are the first flow guide section and the second flow guide section, the first end of the first flow guide section is connected with the first end of the second flow guide section, and the second end of the first flow guide section and the second end of the second flow guide section extend in the same preset direction. The forked flow guide structure can guide air to flow between the first end and the second end of the flow guide section, the heat transfer capacity of the aerosol generating substrate is enhanced, and therefore the risk that the aerosol generating substrate is locally overheated in the heating process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat-not-burn, and particularly to a heating component and an aerosol generating device. Background Art

[0002] Existing heat-not-burn aerosol generating devices mainly consist of a heating element, an aerosol forming substrate, and other structures. Heat transfer between the heating element and the aerosol forming substrate occurs through conduction, convection, or radiation. The heating element usually only locally heats the aerosol forming substrate. Therefore, there are necessarily regions with faster temperature rise and regions with slower temperature rise on the aerosol forming substrate. The regions with faster temperature rise on the aerosol forming substrate are prone to overheating, that is, it is manifested as local overheating of the aerosol forming substrate. The aerosol generated when the aerosol forming substrate is locally overheated is likely to have unpleasant odors such as burnt smell. Therefore, local overheating of the aerosol forming substrate has an adverse effect on the taste of the aerosol. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an improved heating component and an aerosol generating device to reduce the risk of local overheating of the aerosol forming substrate during the heating process.

[0004] The technical solution adopted by the present invention to solve its technical problem is: providing a heating component, which includes a cylindrical outer shell and a heating element; the outer shell defines a cavity for accommodating the aerosol forming substrate, and the heating element is arranged in the cavity; the inner wall surface of the outer shell includes an inner side wall and an inner bottom wall that are connected, at least one flow guiding structure is provided on the inner side wall of the outer shell, each flow guiding structure includes at least two flow guiding segments, and each flow guiding segment includes a first end and a second end; at least two of the flow guiding segments are respectively a first flow guiding segment and a second flow guiding segment, the first end of the first flow guiding segment is connected to the first end of the second flow guiding segment, and the second end of the first flow guiding segment and the second end of the second flow guiding segment extend in the same direction.

[0005] Preferably, the first end of each flow guiding segment is closer to the inner bottom wall than its second end; the second ends of the first flow guiding segment and the second flow guiding segment respectively extend away from the inner bottom wall.

[0006] Preferably, at least two of the flow guiding segments are symmetrically distributed on the inner side wall.

[0007] And / or, the extending trajectory of at least one of the flow guiding segments from its first end to its second end is a curve.

[0008] Preferably, the cavity has a longitudinal axis parallel to the inner sidewall. The inner sidewall of the housing is provided with at least two flow guiding structures, and the at least two flow guiding structures are spaced apart along the extension direction of the longitudinal axis on the inner sidewall.

[0009] Preferably, at least one of the flow guiding sections includes a plurality of the grooves spaced apart along the direction from its first end to its second end;

[0010] Preferably, at least one of the flow guiding sections is entirely recessed in the inner sidewall from its first end to its second end to form a groove.

[0011] Preferably, at least one of the flow guiding sections is at least partially a boss protruding from the inner sidewall.

[0012] Preferably, at least one of the flow guiding sections includes a plurality of the bosses spaced apart along the direction from its first end to its second end. Preferably, the housing includes a cylindrical outer conductor unit and a fixing seat for accommodating an aerosol generating substrate; the outer conductor unit defines the cavity; the fixing seat is cylindrical and is disposed in the cavity, and the inner wall surface of the fixing seat is the inner wall surface of the housing.

[0013] The present invention also provides an aerosol generating device, which includes a microwave generating unit and the heating component according to any one of the above, and the heating component further includes a microwave feeding unit connected to the outer conductor unit, and the microwave feeding unit is connected to the microwave generating unit and feeds the microwave generated by the microwave generating unit into the cavity.

[0014] The present invention has at least the following beneficial effects: The bifurcated flow guiding structure can guide the air to flow between the first end and the second end of the flow guiding section, enhance the heat transfer capacity of the aerosol generating substrate, reduce the heating rate of the high temperature area of the aerosol generating substrate, improve the heating uniformity, and thus reduce the risk of local overheating of the aerosol generating substrate during heating. Description of the Drawings

[0015] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0016] Figure 1 is a schematic diagram of the overall structure of the heating component according to the first embodiment of the present invention;

[0017] Figure 2 is Figure 1 a longitudinal sectional view of the heating component shown;

[0018] Figure 3 is a schematic diagram of the structure of the fixing seat of the heating component according to the first embodiment of the present invention;

[0019] Figure 4 isFigure 3 Longitudinal sectional view of the shown fixed seat;

[0020] Figure 5 It is a schematic longitudinal sectional view of the fixed seat of the heating component of this second embodiment;

[0021] Figure 6 It is a schematic view of the structure of the fixed seat of the heating component of this third embodiment;

[0022] Figure 7 is Figure 6 Longitudinal sectional view of the shown fixed seat;

[0023] Figure 8 It is a schematic view of the structure of the fixed seat of the heating component of this fourth embodiment;

[0024] Figure 9 is Figure 8 Longitudinal sectional view of the shown fixed seat;

[0025] Figure 10 It is a simulation diagram of the temperature distribution of the heating components of three embodiments of the present invention, as well as the heating component without a diversion structure in the prior art;

[0026] Figure 11 It is a simulation diagram of the pressure distribution of the heating components of three embodiments of the present invention, as well as the heating component without a diversion structure in the prior art;

[0027] Figure 12 It is a schematic longitudinal sectional view of the heating component of the fifth embodiment of the present invention. Detailed implementation manners

[0028] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] As Figure 1 and Figure 2 shown, the heating component of the first embodiment of the present invention includes a cylindrical outer shell 1 and a heating element 4. The outer shell 1 defines a cavity 101 for accommodating the aerosol-generating substrate 2. The heating element 4 is disposed in the cavity 101 and is located on one side of the aerosol-generating substrate 2 in the cavity 101 or inserted into the aerosol-generating substrate 2. The heating element 4 is used to heat and atomize the aerosol-generating substrate 2 to generate an aerosol for the user to inhale.

[0030] The aerosol-generating substrate 2 can be a solid aerosol-generating substrate 2 such as a processed plant leaf product. Alternatively, the aerosol-generating substrate 2 can also be a liquid aerosol-generating substrate 2.

[0031] The housing 1 can be cylindrical, square cylindrical, or other types of cylindrical shapes. The main feature of the housing 1 is that one end is closed and the other end is open. The aerosol generating substrate 2 can be loaded into the cavity 101 from the open end of the housing 1. The cylindrical housing 1 has an inner wall surface 12, and the inner wall surface 12 includes an inner side wall 121 and an inner bottom wall 122 that are connected to each other.

[0032] In particular, as Figure 2 shown, at least one flow guiding structure 3 is provided on the inner side wall 121 of the housing 1. When the aerosol generating substrate 2 is placed in the cavity 101, there is no direct contact between the aerosol generating substrate 2 and the flow guiding structure 3. Instead, an intake gap is formed between the aerosol generating substrate 2 and the flow guiding structure 3, so that under the suction force of the user, air can enter the interior of the aerosol generating substrate 2 from the flow guiding structure 3. The air entering the flow guiding structure 3 from the outside can exchange heat (abbreviated as heat exchange) with the aerosol generating substrate 2. The flow guiding structure 3 is used to guide the flow direction of the air flow near the aerosol generating substrate 2, and promote the air flow to flow from the region with a higher temperature on the aerosol generating substrate 2 to the region with a lower temperature. In this way, the heat exchange efficiency between the aerosol generating substrate 2 and the air entering the cavity 101 can be enhanced, thereby reducing the risk of local overheating of the aerosol generating substrate 2 during the heating process.

[0033] The specific structural design of the flow guiding structure 3 of the present invention combines the field synergy theory of the heat and mass transfer process. During the heating process of the aerosol generating substrate 2, due to the gas flow and the continuous generation of aerosol, the fluid flow can carry part of the heat source to migrate, resulting in the heated area of the aerosol generating substrate 2 being significantly affected by the gas flow. Based on the heat and mass transfer field synergy theory, by changing the flow rate, temperature difference, fluid physical properties, or changing the Reynolds number and Prandtl number during the fluid flow process, the convective heat transfer intensity can be controlled. However, through the derivation of the field synergy theory, it can be found that the influence of the angle between the fluid velocity vector and the temperature gradient vector on enhancing the convective heat transfer intensity cannot be ignored either.

[0034] Each flow guiding structure 3 of the present invention includes at least two flow guiding segments, and each flow guiding segment includes a first end 301 and a second end 302. At least two flow guiding segments are respectively the first flow guiding segment 31 and the second flow guiding segment 32. The first end 301 of the first flow guiding segment 31 is connected to the first end 301 of the second flow guiding segment 32, and the second end 302 of the first flow guiding segment 31 and the second end 302 of the second flow guiding segment 32 extend in the same preset direction, and the same preset direction includes the direction away from the inner bottom wall 122 and the direction close to the inner bottom wall 122. In this way, a bifurcated flow guiding structure 3 can be formed. This bifurcated flow guiding structure 3 can control the angle between the fluid velocity vector near the aerosol generating substrate 2 and the temperature gradient vector of the aerosol generating substrate 2, so as to effectively enhance the convective heat transfer intensity between the aerosol generating substrate 2 and the air. As Figure 3 andFigure 4 As shown, in the first embodiment, the diversion structure 3 is generally in a "person" shape. Each diversion structure 3 includes two diversion sections, namely a first diversion section 31 and a second diversion section 32. Each diversion section includes a first end 301 and a second end 302. The first end 301 of each diversion section is closer to the inner bottom wall 122 than its second end 302. The first ends 301 of the first diversion section 31 and the second diversion section 32 are joined together, and the second ends 302 of the first diversion section 31 and the second diversion section 32 extend away from the inner bottom wall 122 respectively. That is, the extension paths of the first diversion section 31 and the second diversion section 32 have the same starting point and extend away from the inner bottom wall 122 in a bifurcated manner respectively.

[0035] As Figure 12 shown, in the fifth embodiment, the second ends 302 of the first diversion section 31 and the second diversion section 32 can also extend towards the inner bottom wall 122 respectively, as long as a bifurcated structure is formed. At this time, the first end 301 of each diversion section is farther from the inner bottom wall 122 than its second end 302.

[0036] Of course, in other embodiments, each diversion structure 3 can also include three or more diversion sections. The first end 301 of each diversion section is joined to the first ends 301 of other diversion sections, and the second end 302 of each diversion section extends in the same preset direction respectively. Generally, the area on the aerosol-forming substrate 2 that is relatively closer to its bottom is the area where the temperature rises faster and is higher (high-temperature area); the area on the aerosol-forming substrate 2 that is relatively farther from its bottom is the area where the temperature rises slower and is lower (low-temperature area). When the aerosol-forming substrate 2 is placed in the cavity 101, the high-temperature area on the aerosol-forming substrate 2 corresponds to the area on the outer shell 1 that is relatively closer to its inner bottom wall 122, and the low-temperature area on the aerosol-forming substrate 2 corresponds to the area on the outer shell 1 that is relatively farther from its inner bottom wall 122.

[0037] In summary, under the suction force of the user, the bifurcated diversion structure 3 can guide the air to flow between the first end 301 and the second end 302 of the diversion section, achieving the effect of coordinating the air flow direction and the heat transfer direction of the aerosol-forming substrate 2, enhancing the heat transfer ability of the aerosol-forming substrate 2, reducing the heating rate of the high-temperature area of the aerosol-forming substrate 2, improving the heating uniformity, and thus reducing the risk of local overheating of the aerosol-forming substrate 2 during the heating process.

[0038] Furthermore, at least two diversion sections can be symmetrically distributed on the inner sidewall 121. That is, it can be that each diversion section of each diversion structure 3 is symmetrically distributed on the inner sidewall 121, or it can be that some of the diversion sections of each diversion structure 3 are symmetrically distributed and some are not. As Figure 3and Figure 4 In the first embodiment shown, the first diversion section 31 and the second diversion section 32 are symmetrically distributed on the inner sidewall 121. The symmetrical distribution of the diversion sections is beneficial to the uniform distribution of the air flow and improves the heating uniformity.

[0039] Furthermore, the extension trajectory of at least one diversion section from its first end 301 to its second end 302 can be a curve. As Figure 3 and Figure 4 shown in the first embodiment, the extension trajectories of the first diversion section 31 and the second diversion section 32 from their first ends 301 to their second ends 302 are both curves. Thus, the diversion sections extend smoothly from their first ends 301 to their second ends 302, showing a circumferential rotation and upward or downward movement along the inner sidewall 121. In this way, the diversion structure 3 can guide the air to flow rotationally and translationally from the first ends 301 of the first diversion section 31 and the second diversion section 32 to the second ends 302 of the first diversion section 31 and the second diversion section 32, enhancing the heat transfer capacity of the aerosol-forming substrate 2 and further reducing the risk of local overheating of the aerosol-forming substrate 2 during the heating process.

[0040] Furthermore, after the second ends 302 of the first diversion section 31 and the second diversion section 32 extend away from the inner bottom wall 122 respectively, they can be joined together. Thus, the first diversion section 31 and the second diversion section 32 can form a closed extension trajectory. Of course, in other embodiments, the second ends 302 of the first diversion section 31 and the second diversion section 32 may not be joined.

[0041] As Figure 3 and Figure 4 shown in the first embodiment, the cavity 101 has a longitudinal axis y, the longitudinal axis y is parallel to the inner sidewall 121, and three diversion structures 3 are provided on the inner sidewall 121, and the three diversion structures 3 are spaced apart along the extension direction of the longitudinal axis y on the inner sidewall 121. As Figure 5 shown in the second embodiment, the number of the diversion structures 3 can be two. It can be understood that the number of the diversion structures 3 can also be four, five, etc. Furthermore, the intervals between adjacent diversion structures 3 can be equal.

[0042] Each diversion section can be concave with respect to the inner sidewall 121 or convex with respect to the inner sidewall 121:

[0043] For example, at least one diversion section can be at least partially a groove recessed in the inner sidewall 121.

[0044] Specifically, it can be that at least one diversion section is entirely recessed in the inner sidewall 121 from its first end 301 to its second end 302, forming a groove. For example Figure 3 and Figure 4In the first embodiment shown, each diversion section is entirely recessed in the inner sidewall 121 from its first end 301 to its second end 302, forming a strip-shaped groove on the inner sidewall 121.

[0045] Alternatively, at least one diversion section may include a plurality of grooves spaced apart in the direction from its first end 301 to its second end 302. For example Figure 6 and Figure 7 In the third embodiment shown, different from the first embodiment, each diversion section includes a plurality of grooves spaced apart in the direction from its first end 301 to its second end 302. Preferably, the intervals between adjacent grooves may be equal.

[0046] As Figure 8 shown, the grooves are oval-shaped. However, the shape of the grooves is not limited to oval, and may also be circular, square, etc.

[0047] Furthermore, at least one diversion section may be at least partially a boss protruding from the inner sidewall 121. As Figure 8 and Figure 9 In the fourth embodiment shown, different from the first embodiment, each diversion section includes a plurality of bosses spaced apart in the direction from its first end 301 to its second end 302. Preferably, the intervals between adjacent bosses may be equal.

[0048] As Figure 9 shown, the bosses are circular. However, the shape of the bosses is not limited to circular, and may also be oval, square, etc.

[0049] The grooves or bosses spaced apart in the direction from the first end 301 to the second end 302 of the diversion section exhibit a periodic texture structure, which can eliminate the local pressure loss in the form of rotational translation, thereby reducing the pressure loss during the suction process of the aerosol generating device. On the basis of reducing the suction pressure loss of the device, this periodic texture structure can also create a large number of local vortices during the air flow process, which can further enhance the heat transfer ability of the aerosol generation matrix 2, thereby further reducing the risk of local overheating of the aerosol generation matrix 2 during the heating process.

[0050] In other embodiments, at least one diversion section may also be entirely protruding from the inner sidewall 121 from its first end 301 to its second end 302, forming a strip-shaped boss on the inner sidewall 121.

[0051] As Figure 3 and Figure 4As shown, on the inner bottom wall 122 of the outer shell 1, a plurality of protruding portions 1221 are provided at intervals. When the aerosol generating substrate 2 is placed in the cavity 101, its bottom is supported on the protruding portions 1221, and its side wall is at least partially attached to the inner side wall 121 of the outer shell 1. Thus, the flow guiding structure 3 defines a first air inlet channel, and a second air inlet channel is defined between adjacent protruding portions 1221. Under the action of the user's suction force, air can flow through the first air inlet channel and the second air inlet channel to exchange heat with the aerosol generating substrate 2, thereby reducing the risk of local overheating of the aerosol generating substrate 2 during the heating process.

[0052] Specifically, when the flow guiding section is concave relative to the inner side wall 121, the flow guiding section itself serves as the first air inlet channel. When the flow guiding section protrudes relative to the inner side wall 121, the first air inlet channel is defined between adjacent flow guiding sections or between adjacent bosses.

[0053] As Figure 1 and Figure 2 As shown, the heating component of the first embodiment of the present invention is a microwave heating component. However, the heating component provided by the present invention is not limited to being a microwave heating component, and can also be a heating component of other heating forms, such as resistance heating, electromagnetic induction heating, etc.

[0054] As Figure 2 As shown, in the first embodiment, the outer shell 1 includes an outer conductor unit 10 and a fixing seat 11 for accommodating the aerosol generating substrate 2. The outer conductor unit 10 is cylindrical, having an outer wall surface and an inner wall surface, and the inner wall surface of the outer conductor unit 10 defines a cavity 101. The fixing seat 11 is cylindrical and is disposed in the cavity 101, and the outer wall surface of the fixing seat 11 is in tight fit with the inner wall surface of the outer conductor unit 10. The fixing seat 11 can be used to prevent impurities such as condensate from contaminating other components inside the cavity 101 and to fix the position of the aerosol generating substrate 2.

[0055] The inner wall surface of the fixing seat 11 is the inner wall surface 12 of the outer shell 1. The fixing seat 11 can be detachably fitted with the outer conductor unit 10 to facilitate the user to clean or replace the fixing seat 11. However, the inner wall surface 12 of the outer shell 1 is not limited to being the inner wall surface of the fixing seat 11. In other embodiments, the fixing seat 11 may not be provided, and the inner wall surface of the cylindrical outer conductor unit 10 can be used as the inner wall surface 12 of the outer shell 1.

[0056] As Figure 3 and Figure 4In the first embodiment shown, the cylindrical fixing base 11 defines a first accommodation cavity 111 and a second accommodation cavity 112. The first accommodation cavity 111 is used to accommodate the aerosol generation matrix 2, and the second accommodation cavity 112 is used to accommodate the probe section 41 of the heating element 4. The flow guiding structure 3 is only provided in the area of the inner wall surface of the fixing base 11 corresponding to the first accommodation cavity 111, and the flow guiding structure 3 may not be provided in the area of the inner wall surface of the fixing base 11 corresponding to the second accommodation cavity 112. At this time, the second ends 302 of the first flow guiding section 31 and the second flow guiding section 32 only extend to the junction of the first accommodation cavity 111 and the second accommodation cavity 112.

[0057] As Figure 2 shown, in the first embodiment, the shape of the outer conductor unit 10 is similar to an eccentric shaft. The cavity 101 includes two communicating first sub-cavities and a second sub-cavity. The first sub-cavity and the second sub-cavity respectively have a central axis and a cross-section, and the cross-section is perpendicular to the central axis. The central axis is parallel to the longitudinal axis y of the cavity 101, but not necessarily coincident. The central axis of the first sub-cavity does not coincide with the central axis of the second sub-cavity, and the cross-sectional area of the first sub-cavity is larger than the cross-sectional area of the second sub-cavity. The first sub-cavity is used to accommodate the aerosol generation matrix 2, and the flow guiding structure 3 is located in the first sub-cavity.

[0058] The outer conductor unit 10 can be processed from a metal material or other highly conductive materials. For example, the outer conductor unit 10 can include one or more of gold, silver, copper, aluminum, iron, gold-containing alloys, aluminum-containing alloys, copper-containing alloys, iron-containing alloys, stainless steel, etc. Alternatively, the outer conductor unit 10 can also include a non-metallic main body and a metal coating provided on the outer layer of the non-metallic main body.

[0059] The fixing base 11 can include one or more of Teflon, PEEK, quartz, alumina ceramics, gold, silver, copper, aluminum, iron, gold-containing alloys, aluminum-containing alloys, copper-containing alloys, iron-containing alloys, stainless steel, etc.

[0060] The aerosol generating device provided by the present invention can use microwave to heat the aerosol generation matrix 2 to atomize and generate aerosol for the user to inhale or suck. The aerosol generating device can include a microwave generating device (not shown) and a microwave heating component. The microwave generating device can generate microwave. When the device is in use, the aerosol generation matrix 2 is loaded into the microwave heating component, and the microwave heating component is connected to the microwave generating device to access microwave, forming a microwave field, and the microwave field can act on the aerosol generation matrix 2 to realize microwave heating.

[0061] As Figure 2As shown, the microwave heating component may further include a microwave feeding unit connected to the outer shell 1. The microwave feeding unit is connected to the microwave generating unit and feeds the microwave generated by the microwave generating unit into the cavity 101. The microwave feeding unit may include a radio frequency connector 6. A microwave feeding hole (not shown) is formed in the outer conductor unit 10. The radio frequency connector 6 extends into the cavity 101 through the microwave feeding hole and is in ohmic contact with the outer conductor unit 10 and the impedance matching section 42 of the heating element 4 respectively. The radio frequency connector 6 may be a standard or non-standard radio frequency connector. For example, the radio frequency connector 6 may be a standard SMP-JYD radio frequency connector.

[0062] The heating element 4 may serve as the inner conductor unit of the microwave heating component. It includes a probe section 41 and an impedance matching section 42 connected to each other. The impedance matching section 42 is in ohmic contact with the outer conductor unit 10. The probe section 41 extends toward the open end of the outer shell 1 and is located on one side of the aerosol generating matrix 2, and is used to generate a microwave field to heat and atomize the aerosol generating matrix 2.

[0063] Please refer to Figure 10 、 Figure 11 and Table 1 below, Figure 10 which are the temperature distribution simulation diagrams of the heating components of three embodiments of the present invention and the heating component without the diversion structure 3 in the prior art. Figure 11 which are the pressure distribution simulation diagrams of the heating components of three embodiments of the present invention and the heating component without the diversion structure 3 in the prior art.

[0064] The following Table 1 shows the simulation data of the heating components of three embodiments of the present invention and the heating component without the diversion structure 3 in the prior art:

[0065]

[0066] Table 1

[0067] It can be seen from Table 1 that compared with the heating component without the diversion structure 3 in the prior art, after the heating components of the three embodiments of the present invention are provided with the bifurcated diversion structure 3, the maximum temperature of the aerosol generating matrix 2 decreases, the temperature at the gas outlet end of the aerosol generating matrix 2 decreases, and the suction pressure loss of the aerosol generating device decreases. The average temperature of the aerosol generating matrix 2 in two of the embodiments increases. This is sufficient to show that the heating component of the present invention can further enhance the heat transfer ability of the aerosol generating matrix 2, thereby further reducing the risk of local overheating of the aerosol generating matrix 2 during the heating process.

[0068] For the technical features not mentioned in each embodiment described herein, reference may be made to any other embodiment or set in combination with multiple embodiments, and details will not be elaborated herein.

[0069] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A heating component, characterized in that, It includes a cylindrical outer shell (1) and a heating element (4); the outer shell (1) defines a cavity (101) for accommodating an aerosol - generating substrate (2), and the heating element (4) is disposed in the cavity (101); the inner wall surface (12) of the outer shell (1) includes an inner side wall (121) and an inner bottom wall (122) that are joined. The inner side wall (121) of the outer shell (1) is provided with at least one flow - guiding structure (3), and each flow - guiding structure (3) includes at least two flow - guiding segments. Each flow - guiding segment includes a first end (301) and a second end (302); at least two of the flow - guiding segments are respectively a first flow - guiding segment (31) and a second flow - guiding segment (32). The first end (301) of the first flow - guiding segment (31) is joined to the first end (301) of the second flow - guiding segment (32), and the second end (302) of the first flow - guiding segment (31) and the second end (302) of the second flow - guiding segment (32) extend in the same preset direction. The preset direction includes a direction away from the inner bottom wall (122) and a direction close to the inner bottom wall (122).

2. The heating component according to claim 1, characterized in that, The first end (301) of each flow - guiding segment is closer to the inner bottom wall (122) than its second end (302); the second ends (302) of the first flow - guiding segment (31) and the second flow - guiding segment (32) extend in directions away from the inner bottom wall (122) respectively.

3. The heating component according to claim 1, characterized in that, At least two of the flow - guiding segments are symmetrically distributed on the inner side wall (121); and / or, the extension trajectory of at least one of the flow - guiding segments from its first end (301) to its second end (302) is a curve.

4. The heating component according to claim 1, characterized in that, The cavity (101) has a longitudinal axis (y), the longitudinal axis (y) is parallel to the inner side wall (121), and the inner side wall (121) of the outer shell (1) is provided with at least two flow - guiding structures (3). The at least two flow - guiding structures (3) are spaced apart along the extension direction of the longitudinal axis (y) on the inner side wall (121).

5. The heating assembly according to claim 1, wherein At least one of the flow - guiding segments includes a plurality of grooves spaced apart in the direction from its first end (301) to its second end (302).

6. The heating component according to claim 1, wherein At least one of the flow - guiding segments is entirely recessed in the inner side wall (121) from its first end (301) to its second end (302) to form a groove.

7. The heating assembly according to claim 1, characterized in that, At least one of the flow - guiding segments is at least partially a boss protruding from the inner side wall (121).

8. The heating assembly according to claim 7, characterized in that, At least one of the flow - guiding segments includes a plurality of bosses spaced apart in the direction from its first end (301) to its second end (302).

9. The heating component according to any one of claims 1 to 8, characterized in that, The outer shell (1) includes a cylindrical outer conductor unit (10) and a fixing seat (11) for accommodating an aerosol - generating substrate (2); the outer conductor unit (10) defines the cavity (101); the fixing seat (11) is cylindrical and is disposed in the cavity (101), and the inner wall surface of the fixing seat (11) is the inner wall surface (12) of the outer shell (1).

10. An aerosol generating device, characterized in that, Comprising a microwave generating unit and the heating component according to any one of claims 1 to 9, the heating component further comprising a microwave feeding unit connected to the outer conductor unit (10), the microwave feeding unit being connected to the microwave generating unit and feeding the microwave generated by the microwave generating unit into the cavity (101).

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