Patent Description:
Traditional products produce aerosols by burning, and when baked at a high temperature of more than <NUM>, a large quantity of harmful substances are easily volatilized. In order to meet the needs of people and reduce the harm caused by the harmful substances caused by burning, an aerosol-generating device of a "heat-not-burn" type emerges.

The aerosol-generating device of the "heat-not-burn" type generates aerosols by heating and baking different forms of aerosol-generating substrates (such as grass leaf materials), and transmits the aerosol to a user for inhalation. In this "heat-not-burn" manner, the aerosol-generating substrate is heated only at a lower temperature (<NUM>-<NUM>), does not burn and does not generate an open flame, and effectively avoids generation of harmful substances caused by the aerosol-generating substrate.

Currently, electromagnetic induction heating or resistive material heating is commonly used in the "heat-not-burn" aerosol-generating device. The electromagnetic induction heating is as follows: A coil is disposed around a heating member that contains the aerosol-generating substrate, the heating member heats up by means of electromagnetic induction, heat is conducted to the aerosol-generating substrate, and baking and heating are performed on the aerosol-generating substrate.

The aerosol-generating substrate is usually formed into a close fit with the heating member for baking and heating. As electromagnetic induction heating efficiency is fast, the heating member is able to reach a very high temperature at a moment, and the outer periphery of the aerosol-generating substrate that is in direct contact with the heating member is able to easily reach a high temperature. However, as inner heat transfer efficiency of the aerosol-generating substrate is low, baking of the inner aerosol-generating substrate is insufficient, and temperature distribution of the inner and outer periphery of the aerosol-generating substrate is uneven.

The documents <CIT>, <CIT>, <CIT> and <CIT> disclose pertinent aerosol-generating devices.

According to the aerosol-generating device provided in the present disclosure, the aerosol-generating device is able to resolve the problem that the inner and outer peripheral temperatures are uneven when the aerosol-generating substrate is heated.

In order to resolve the foregoing technical problem, the present disclosure adopts a technical solution as follows. An aerosol-generating device is provided. The aerosol-generating device includes a heating base and a heating member. The heating base includes a heating cavity; and the heating member is configured to accommodate and heat an aerosol-generating substrate, the heating member is disposed in the heating cavity; the heating member includes a first sidewall, and a first airflow channel is formed between the first sidewall and the inner surface of the heating cavity; and at least one protrusion is disposed on the inner surface of the first sidewall, the protrusion makes a second airflow channel formed between the first sidewall and the aerosol-generating substrate, and both the first airflow channel and the second airflow channel are led from the outside of the aerosol-generating device to the bottom of the heating cavity.

In some embodiments, the ratio of the surface area of the protrusion for contacting the aerosol-generating substrate to the inner surface area of the first sidewall is <NUM>%-<NUM>%.

In some embodiments, the height of the protrusion is <NUM>-<NUM>.

In some embodiments, the first sidewall is disposed in a ring shape.

In some embodiments, the at least one protrusion is spirally disposed on the inner surface of the first sidewall; or the at least one protrusion is a plurality of strip-shaped protrusions disposed on the inner surface of the first sidewall at intervals in the circumferential direction; or the at least one protrusion is a plurality of arcuate protrusions disposed on the inner surface of the first sidewall at intervals in the circumferential direction; or the at least one protrusion is a plurality of dotted protrusions distributed in an array on the inner surface of the first sidewall; or the at least one protrusion is a plurality of annular protrusions disposed on the inner surface of the first sidewall at intervals in the axial direction, and each annular protrusion includes a groove or a through hole.

In some embodiments, a part of the first sidewall portion protrudes inwards to form the protrusion.

In some embodiments, the first sidewall is disposed in a ring shape, and the heating member is disposed coaxially with the heating base.

In some embodiments, the heating base includes a second sidewall, a first limiting member is disposed between the first sidewall and the second sidewall, and the first limiting member spaces the first sidewall from the second sidewall to form the first airflow channel between the first sidewall and the inner surface of the heating cavity.

The outer surface of the first sidewall protrudes to form the first limiting member; and/or the inner surface of the second sidewall protrudes to form the first limiting member.

In some embodiments, the first limiting member includes an air hole to enable air to flow through the first airflow channel to the bottom of the aerosol-generating substrate. The heating base includes a second sidewall and a bottom wall, and the second sidewall surrounds to form the heating cavity; and a third airflow channel is formed between the bottom wall and the aerosol-generating substrate, and the third airflow channel communicates with the first airflow channel and the second airflow channel.

In some embodiments, a first limiting member is disposed between the first sidewall and the second sidewall, and the first limiting member is configured to limit the radial position of the heating member to separate the first sidewall and the second sidewall.

In some embodiments, the first sidewall abuts against the bottom wall, and the end of the first sidewall close to the bottom wall has an opening for the third airflow channel to communicate with the first airflow channel.

In some embodiments, the bottom wall or the first sidewall or the second sidewall is provided with a second limiting member; and the second limiting member spaces the aerosol-generating substrate from the bottom wall to form the third airflow channel.

In some embodiments, a fourth opening is formed at the end of the heating member close to the bottom of the heating cavity, the height of the second limiting member is higher than or equal to the distance between the fourth opening and the bottom of the heating cavity.

In some embodiments, the first limiting member includes an air hole to enable air to flow through the first airflow channel to the bottom of the aerosol-generating substrate.

Beneficial effects of the present disclosure are as follows.

According to the aerosol-generating device provided in the present disclosure, a first airflow channel and a second airflow channel are formed on two sides of a heating member. A protrusion in the second airflow channel changes a heat transfer mode of the heating member for heating the aerosol-generating substrate from heat conduction to a combination of heat conduction and heat convection, in which heat convection takes a main heat transfer manner. Heat transfer efficiency of heat convection is lower than heat transfer efficiency of heat conduction, and therefore, the heat transfer rate of the heat from the heating member to the outer periphery of the aerosol-generating substrate is able to be effectively slowed down. In addition, a cold airflow passes through the first airflow channel and the second airflow channel, such that the heating rate of air in the first airflow channel and the second airflow channel is able to be slower, and the heat transfer rate of the heating member to the outer periphery of the aerosol-generating substrate is close to the heat transfer rate of the outer periphery of the aerosol-generating substrate to the inside of the aerosol-generating substrate. Therefore, the temperature difference between the inner and outer periphery of the aerosol-generating substrate is effectively reduced, thereby resolving the problem of uneven temperature distribution between the inner and outer periphery of the aerosol-generating substrate during heating.

To describe the technical solutions of the embodiments of the present disclosure more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show only some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

The technical solutions in embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure.

In the following description, for the purpose of illustration rather than limitation, specific details such as the specific system structure, interface, and technology are proposed to thoroughly understand the present disclosure.

The term "and/or" in this specification is merely an association relationship for describing associated objects, and indicates that there may be three relationships. For example, A and/or B may indicate the following three cases: only A exists, both A and B exist, and only B exists. In addition, "a plurality of" in this specification means two or more than two.

The terms "first", "second", and "third" in the present disclosure are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or implicit indication of the number of indicated technical features. Therefore, features defining "first", "second", and "third" may explicitly or implicitly include at least one feature. In description of the present disclosure, "plurality of" means at least two, such as two and three unless it is specifically defined otherwise. All directional indications (for example, up, down, left, right, front, back. ) in the embodiments of the present disclosure are only used for explaining relative position relationships, movement situations, or the like between the various components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications change accordingly. In the embodiments of the present disclosure, the terms "include", "have", and any variant thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but further optionally includes a step or unit that is not listed, or further optionally includes another step or component that is intrinsic to the process, method, product, or device.

Embodiments mentioned in the specification means that particular features, structures, or characteristics described with reference to the embodiments may be included in at least one embodiment of the present disclosure. A term appearing at different positions of this specification may not refer to the same embodiment or an independent or alternative embodiment that is mutually exclusive with some embodiments. A person skilled in the art explicitly or implicitly understands that the embodiments described in the specification may be combined with other embodiments.

The following describes the present disclosure in detail with reference to the accompanying drawings and embodiments.

It should be noted in advance that generally, the outside of an aerosol-generating substrate has a housing. For example, the outside is provided with a paper package, but to make the description of the embodiments more simplified, an aerosol-generating substrate described below generally refers to an aerosol-generating substrate including a housing.

As illustrated in <FIG>, <FIG> is a structural schematic view of an aerosol-generating device <NUM> according to the present disclosure, <FIG> is a cross-sectional structural schematic view of the aerosol-generating device <NUM> shown in <FIG>, <FIG> is an enlarged structural schematic view of part A shown in <FIG>, and <FIG> is a structural schematic view of an aerosol-generating device <NUM> and an aerosol-generating substrate <NUM> assembled together.

In the present embodiment, the aerosol-generating device <NUM> is provided. The aerosol-generating device <NUM> may be configured to heat and bake the aerosol-generating substrate <NUM> and generate an aerosol for a user to inhale. The aerosol-generating device <NUM> includes a housing <NUM> and a heating switch <NUM>. The heating switch <NUM> is disposed on the outer surface of the housing <NUM>, and is configured to control on and off of the aerosol-generating device <NUM>. Various components of the aerosol-generating device <NUM> are disposed in the housing <NUM>. In the present embodiment, the shape of the housing <NUM> is cylindrical. In other embodiments, the housing <NUM> may also be other shapes. The housing <NUM> may be made of the same material, or may be made of multiple materials. For example, the housing <NUM> includes a plastic outer layer and a metal inner layer, and the user is only able to contact the plastic outer layer when using it. Heat generated inside the aerosol-generating device <NUM> is evenly distributed in the metal inner layer due to the property of rapid heat conduction of the metal, so as to prevent scalding hands of the user as a result of the heated plastic outer layer being touched by the user, and is able to further prevent softening of the plastic outer layer.

The aerosol-generating device <NUM> further includes an atomizer <NUM>, a battery assembly <NUM>, and a controller <NUM>. The atomizer <NUM> is electrically connected to the battery assembly <NUM>. Specifically, a top of the housing <NUM> has a first opening <NUM>, the inside of the housing <NUM> has a mounting cavity <NUM>, both the atomizer <NUM> and the battery assembly <NUM> are disposed in the mounting cavity <NUM>, and the atomizer <NUM> is disposed on one side of the battery assembly <NUM> close to the first opening <NUM>. The atomizer <NUM> is configured to heat and bake the aerosol-generating substrate <NUM> and generate an aerosol, and the battery assembly <NUM> is configured to provide a power supply for the atomizer <NUM>.

Further, the atomizer <NUM> includes a heating base <NUM>, a coil <NUM>, and a heating member <NUM>. The controller <NUM> is disposed on one side of the battery assembly <NUM> close to the first opening <NUM>, and the controller <NUM> is electrically connected to the coil <NUM>, the heating switch <NUM>, and the battery assembly <NUM>. The controller <NUM> is configured to control start and stop of heating of the coil <NUM> and the heating member <NUM> by means of electromagnetic induction, and is able to control parameters such as a heating power and a temperature. When the user needs to use the aerosol-generating device <NUM>, the heating switch <NUM> of the housing <NUM> may be pressed. When the controller <NUM> receives a request of start using from the user, the battery assembly <NUM> is controlled to supply power to the coil <NUM>, such that the coil <NUM> and the heating member <NUM> heat the aerosol-generating substrate by means of electromagnetical induction. When the user presses the heating switch <NUM> of the housing <NUM> again, the controller <NUM> receives a request of stop using from the user, and controls the battery assembly <NUM> to stop supplying power to the coil <NUM>, then the coil <NUM> stops working. The controller <NUM> further has other functions, and details are not described herein.

The heating base <NUM> is configured to fasten the aerosol-generating substrate <NUM>. The heating base <NUM> is disposed at one end of the mounting cavity <NUM> close to the first opening <NUM>, and the heating base <NUM> has a bottom wall <NUM> and a second sidewall <NUM>. In the present embodiment, the second sidewall <NUM> of the heating base <NUM> is arranged in a ring shape and is shaped as a cylinder, the second sidewall <NUM> is disposed at one end of the bottom wall <NUM> close to the first opening <NUM>, and the second sidewall <NUM> and the bottom wall <NUM> of the heating base <NUM> surround to form the heating cavity <NUM>. The thickness of the bottom wall <NUM> is greater than the thickness of the second sidewall <NUM>, such that the structural strength of the heating base <NUM> is higher. Further, the second sidewall <NUM> and the bottom wall <NUM> are integrally formed, and the material of the second sidewall <NUM> and the bottom wall <NUM> may be a thermally conductive material such as a metal or an alloy.

A top of the second sidewall <NUM> of the heating base <NUM> abuts against a top of the housing <NUM>, and the heating base <NUM> is coaxially disposed with the housing <NUM>. One end of the second sidewall <NUM> close to the first opening <NUM> has a second opening <NUM>, and the caliber of the second opening <NUM> is greater than or equal to the caliber of the first opening <NUM>. Therefore, the heating base <NUM> separates the mounting cavity <NUM> from the heating cavity <NUM>, and the heating cavity <NUM> communicates with the outside of the aerosol-generating device <NUM> through the second opening <NUM> and the first opening <NUM>. In the present embodiment, the caliber of the second opening <NUM> is the same as the caliber of the first opening <NUM> and less than the inner diameter of the second sidewall <NUM>, and shapes of both the second opening <NUM> and the first opening <NUM> are circular. In some embodiments, the heating base <NUM> is not limited to the structure described in the present embodiment.

The coil <NUM> is configured to heat the aerosol-generating substrate <NUM>. In the present embodiment, the coil <NUM> is sleeved on the outer periphery of the second sidewall <NUM> of the heating base <NUM>, so as to heat the aerosol-generating substrate <NUM> in the heating member <NUM>. In the present embodiment, the coil <NUM> is a spirally wound coil, and a changing magnetic field is generated after the coil is energized, forming an eddy current which penetrates the metal heating member <NUM>, such that the metal heating member <NUM> heats up and heats the aerosol-generating substrate <NUM>. In other embodiments, other heating manners, for example, a resistance wire, may be used to heat the aerosol-generating substrate <NUM>.

The heating member <NUM> is disposed in the heating cavity <NUM>. The heating member <NUM> includes a first sidewall <NUM>. Further, the first sidewall <NUM> of the heating member <NUM> is annularly arranged, and one end of the first sidewall <NUM> close to the second opening <NUM> has a third opening <NUM>. Therefore, the inside of the heating member <NUM> communicates with the heating cavity <NUM>, and communicates with the outside of the aerosol-generating device <NUM>.

As illustrated in <FIG>, <FIG>, the heating member <NUM> is configured to accommodate and heat the aerosol-generating substrate <NUM>, and the aerosol-generating substrate <NUM> may be disposed inside the heating member <NUM>. When the user uses the aerosol-generating device <NUM>, the aerosol-generating substrate <NUM> is inserted from the first opening <NUM> of the aerosol-generating device <NUM>, and is disposed inside a heat conductive body after successively passing through the second opening <NUM> of the heating base <NUM> and the third opening <NUM> of the heating member <NUM>.

In the present embodiment, the shape of the heating member <NUM> may be cylindrical, or certainly, may be other shapes, such as a cylinder-like shape or a cube. The heating member <NUM> is coaxial with the heating base <NUM>. Therefore, the coil <NUM> is able to evenly heat the outer periphery of the first sidewall <NUM>, and is further able to evenly heat the outer periphery of the aerosol-generating substrate <NUM>.

As illustrated in <FIG> and <FIG> is a schematic view of a flow path of an airflow in the aerosol-generating device <NUM> according to the present disclosure. Further, at least one protrusion <NUM> is provided on the inner surface of the first sidewall <NUM> of the heating member <NUM>. A part of the surface of the protrusion <NUM> is in contact with the outer periphery of the aerosol-generating substrate <NUM>, and heat is transferred to the aerosol-generating substrate <NUM> in a heat conduction manner. When the aerosol-generating substrate <NUM> is disposed inside the heating member <NUM>, the protrusion <NUM> of the first sidewall <NUM> is able to form a gap between the aerosol-generating substrate <NUM> and the inner surface of the first sidewall <NUM>, and form a second airflow channel <NUM>. The second airflow channel <NUM> is led from the outside of the aerosol-generating device <NUM> to the bottom of the heating cavity <NUM>, such that air flows from the third opening <NUM> into the second airflow channel <NUM>, flows to the bottom of the heating cavity <NUM> through the second airflow channel <NUM>, and finally flows to one end of the aerosol-generating substrate <NUM> away from the third opening <NUM>. When the airflow flows through the protrusion <NUM> on the first sidewall <NUM>, the airflow flows from two sides of the protrusion <NUM> to the bottom of the aerosol-generating substrate <NUM>.

There is a gap between the outer surface of the first sidewall <NUM> and the inner surface of the heating cavity <NUM>, such that the outer surface of the first sidewall <NUM> and the inner surface of the heating cavity <NUM> form a first airflow channel <NUM>. The first airflow channel <NUM> is led from the outside of the aerosol-generating device <NUM> to the bottom of the heating cavity <NUM>, such that air flows from the second opening <NUM> into the second airflow channel <NUM>, flows to the bottom of the heating cavity <NUM> through the second airflow channel <NUM>, and finally flows to one end of the aerosol-generating substrate <NUM> away from the third opening <NUM>.

In the present embodiment, the second airflow channel <NUM> and the protrusion <NUM> are disposed to change the heat transfer mode of the heating member <NUM> to the aerosol-generating substrate <NUM> from heat conduction to a combination of heat conduction and heat convection, and heat convection is the main heat transfer manner. Heat transfer efficiency of heat convection is lower than heat transfer efficiency of heat conduction, and therefore, a heat transfer rate of the heat from the heating member <NUM> to the outer periphery of the aerosol-generating substrate <NUM> is effectively slowed down. Therefore, the heat transfer rate of the heating member <NUM> to the outer periphery of the aerosol-generating substrate <NUM> is close to the heat transfer rate of the outer periphery of the aerosol-generating substrate <NUM> to the inside of the aerosol-generating substrate <NUM>. Thus, the temperature difference between the inner and outer periphery of the aerosol-generating substrate <NUM> is effectively reduced, thereby resolving the problem of uneven temperature between the inner and outer periphery of the aerosol-generating substrate <NUM> during heating.

The first airflow channel <NUM> and the second airflow channel <NUM> are disposed on two sides of the heating member <NUM>, such that the heating rate of air in the first airflow channel <NUM> and in the second airflow channel <NUM> is slower. The airflow flows from the outside of the aerosol-generating device <NUM> through the first airflow channel <NUM> and the second airflow channel <NUM> to the bottom of the heating cavity <NUM>, and heat in the first airflow channel <NUM> and the second airflow channel <NUM> is taken away, such that heat generated by the heating member <NUM> and heat radiated by the first sidewall <NUM> on the inner surface of the heating base <NUM> are reduced. Therefore, the heat transfer rate of the heat to the outer periphery of the aerosol-generating substrate <NUM> is slower, the temperature difference between the outer periphery of the aerosol-generating substrate <NUM> and the inside of the aerosol-generating substrate <NUM> is smaller, and uniformity of temperature distribution between the inner periphery and the outer periphery of the aerosol-generating substrate <NUM> is better, thereby resolving the problem of uneven temperature between the inner and outer periphery of the aerosol-generating substrate during heating.

In addition, cold air flows through the first airflow channel <NUM> and the second airflow channel <NUM>, and takes away some heat in the first airflow channel <NUM> and the second airflow channel <NUM>, such that heat transferred by the heating cavity <NUM> to the housing <NUM> of the aerosol-generating device <NUM> is reduced. Therefore, the housing <NUM> of the aerosol-generating device <NUM> is able to be insulated.

Moreover, the first airflow channel <NUM> and the second airflow channel <NUM> are disposed on two sides of the heating member <NUM>, such that flow of the airflow in the heating cavity <NUM> is able to be increased, and the airflow may simultaneously flow from two sides of the first sidewall <NUM>. Therefore, inhalation resistance inside the aerosol-generating device <NUM> is smaller, and the user inhales more easily when using the aerosol-generating device <NUM>.

The protrusion <NUM> is able to further reduce a contact area between the heating member <NUM> and the aerosol-generating substrate <NUM>, and an aerosol condensate is less likely to adhere to the first sidewall <NUM>, thereby reducing adhesion of stains on the heating member <NUM>. In some embodiments, when the housing of the aerosol-generating substrate <NUM> is a paper outer wall, the arrangement of the protrusion <NUM> is also able to reduce a contact area between the heating member <NUM> and the paper outer wall, so as to prevent the paper outer wall from being baked and pasted due to overheating, and prevent a pungent smell from forming, which improves user experience.

In some embodiments, the ratio of the surface area of the protrusion <NUM> in contact with the aerosol-generating substrate <NUM> to the inner surface area of the first sidewall <NUM> is <NUM>%-<NUM>%. For example, the ratio may be <NUM>%, <NUM>%, or <NUM>%. The surface of the protrusion <NUM> in contact with the aerosol-generating substrate <NUM> means: the surface of one end of the protrusion <NUM> in contact with the surface of the aerosol-generating substrate <NUM> when the aerosol-generating substrate <NUM> is disposed in the heating member <NUM>. The smaller the area ratio of the contact surface to the inner surface of the first sidewall <NUM> is, the smaller the heat transfer area of the heat conduction is, in the common heat transfer manner, the smaller the proportion of heat conduction to heat convection is. When the area ratio is between <NUM>%-<NUM>%, heat convection is the main heat transfer mode in the common heat transfer mode, and the heat transfer rate of the heat to the aerosol-generating substrate <NUM> is greatly reduced. As the heat transfer rate between the aerosol-generating substrate <NUM> and the first sidewall <NUM> is reduced, the heat transfer rate of the heating member <NUM> toward the outer periphery of the aerosol-generating substrate <NUM> is gradually similar to the heat transfer rate of the outer periphery of the aerosol-generating substrate <NUM> toward the inside of the aerosol-generating substrate <NUM>, and the temperature difference between the inner and outer periphery of the aerosol-generating substrate <NUM> is reduced, thereby effectively resolving the problem of uneven temperature distribution on the inner periphery and outer periphery of the aerosol-generating substrate <NUM> during heating. In some cases, the heat transfer rate inside the aerosol-generating substrate <NUM> is greater than the heat transfer rate between the heating member <NUM> and the outer periphery of the aerosol-generating substrate <NUM>, and the temperature difference between the inside and outside of the aerosol-generating substrate <NUM> tends to be <NUM> after heating for a period of time, and the inner and outer periphery temperature are more evenly distributed.

The area ratio of the contact surface to the inner surface of the first sidewall <NUM> may not be too high or too low, and when the area ratio is too high, the proportion of heat convection in the common heat transfer manner is reduced, and the heat transfer rate of the heat to the aerosol-generating substrate <NUM> is not able to be reduced. Too low an area ratio makes the proportion of heat conduction too low and the heating effect is not good.

In the present embodiment, a part of the first sidewall <NUM> protrudes toward the aerosol-generating substrate <NUM> to form the protrusion <NUM>. In this manner, a mold is used to stamp the outer surface of the first sidewall <NUM> to the inside of the first sidewall <NUM> to form the protrusion <NUM>. A processing process of the protrusion <NUM> is simple, and costs are relatively low. In some embodiments, the protrusion <NUM> may be a bump, and the bump is disposed on the inner surface of the first sidewall <NUM>. The material of the bump may be the same as the material of the first sidewall <NUM>, and the bump and the first sidewall <NUM> are integrally formed. The bump may alternatively be made of a material different from the material of the first sidewall <NUM>, and the bump may be made of a material with relatively poor heat conductivity. Therefore, when the heat is transferred from the protrusion <NUM> to the aerosol-generating substrate <NUM> in the heat conduction manner, As heat conductivity of the bump is relatively poor, the speed of heat conduction may be reduced, such that the heat transfer rate of the heating member <NUM> to the outer periphery of the aerosol-generating substrate <NUM> and the heat transfer rate of the outer periphery of the aerosol-generating substrate <NUM> to the inside of the aerosol-generating substrate <NUM> are closer to each other. Therefore, the temperature difference between the inner and outer periphery of the aerosol-generating substrate <NUM> is effectively reduced, and the temperature of the inner and outer periphery of the aerosol-generating substrate <NUM> is more uniform.

In some embodiments, the maximum height of the protrusion <NUM> is <NUM>-<NUM>. The maximum height of the protrusion <NUM> refers to the maximum height at which the protrusion <NUM> protrudes relative to the inner surface of the first sidewall <NUM>. The maximum height of the protrusion <NUM> may be adjusted to adjust the width of the gap between the heating member <NUM> and the aerosol-generating substrate <NUM>, so as to control the size of the airflow in the second airflow channel <NUM>, thereby achieving the effect of adjusting the inhalation resistance. The smaller the maximum height of the protrusion <NUM>, the larger the inhalation resistance. Conversely, the larger the maximum height of the protrusion <NUM>, the smaller the inhalation resistance.

There may be a plurality of protrusions <NUM>, and the plurality of protrusions <NUM> may be spirally disposed on the inner surface of the first sidewall <NUM>. The plurality of protrusions <NUM> may be circumferentially distributed on the inner surface of the first sidewall <NUM>, and/or the plurality of protrusions <NUM> are axially distributed on the inner surface of the first sidewall <NUM>. The greater the quantity of protrusions <NUM>, the greater the proportion of heat conduction between the heating member <NUM> and the aerosol-generating substrate <NUM> in the common heat transfer of heat conduction and heat convection. When there are three or more protrusions <NUM>, the plurality of protrusions <NUM> may be evenly distributed along the circumferential direction at intervals, and the plurality of protrusions <NUM> are in contact with the peripheral edge of the aerosol-generating substrate <NUM>, so as to limit the aerosol-generating substrate <NUM>.

The shape of the protrusion <NUM> may be a regular shape, such as a strip shape, a dot shape, or a ring shape, or may be an irregular shape. In the present disclosure, four types of heating members <NUM> with different shapes and distributed protrusions <NUM> are shown in <FIG>.

The protrusion <NUM> in <FIG> is strip-shaped, and the strip-shaped protrusion <NUM> extends from the third opening <NUM> to one end facing away from the third opening <NUM>, that is, extends from the top of the first sidewall <NUM> to the bottom. The plurality of strip-shaped protrusions <NUM> are distributed on the inner surface of the first sidewall <NUM> at intervals in the circumferential direction. Specifically, the four strip-shaped protrusions <NUM> are evenly circumferentially distributed on the inner surface of the first sidewall <NUM>. The extending direction of the strip-shaped protrusion <NUM> may be parallel to the axial direction of the heating member <NUM>.

The protrusion <NUM> in <FIG> is arcuate, one end of the arcuate protrusion <NUM> extends in the circumferential direction to another end, and a plurality of arcuate protrusions <NUM> are distributed on the inner surface of the first sidewall <NUM> at intervals in the circumferential direction. Specifically, the four arcuate protrusions <NUM> are evenly circumferentially distributed on the inner surface of the first sidewall <NUM>. The distribution of the protrusions <NUM> shown in <FIG> may also be considered as an annular protrusion <NUM> being broken into four arcuate protrusions <NUM> in the circumferential direction. The plurality of annular protrusions <NUM> may be disposed at intervals in the axial direction of the heating member <NUM>, and each annular protrusion <NUM> includes a groove or a through hole, so as to form the second airflow channel <NUM>.

The protrusions <NUM> shown in <FIG> are dot-shaped, and the dot-shaped protrusions <NUM> are distributed in an array on the inner surface of the first sidewall <NUM>. Specifically, twelve dot-shaped protrusions <NUM> are distributed in an array on the inner surface of the first sidewall <NUM>. In some embodiments, the dot-shaped protrusions <NUM> may alternatively be irregularly distributed on the inner surface of the first sidewall <NUM>. The plurality of dot-shaped protrusions <NUM> may be distributed in a plurality of rows, each row of dot-shaped protrusions <NUM> is arranged along the axial direction of the heating member <NUM>, and the plurality of rows of dot-shaped protrusions <NUM> are disposed at intervals in the circumferential direction of the heating member <NUM>.

The protrusions <NUM> shown in <FIG> are spirally shaped. <FIG> is a front view of the heating member <NUM> provided with the spirally shaped protrusions <NUM>. <FIG> is a structural schematic view of the heating member <NUM> provided with the spirally shaped protrusions <NUM>. The spiral protrusion <NUM> of the present embodiment is a non-closing ring, such that the second airflow channel <NUM> is able to be formed between the inner surface of the first sidewall <NUM> and the aerosol-generating substrate <NUM>, and is led from the third opening <NUM> to one end of the aerosol-generating substrate <NUM> facing away from the third opening <NUM>. In some embodiments, the spiral protrusions <NUM> may alternatively be disconnected and axially distributed on the inner surface of the first sidewall <NUM>.

In conclusion, the shape and distribution of the protrusions <NUM> need to enable the second airflow channel <NUM> to be formed between the inner surface of the heating member <NUM> and the aerosol-generating substrate <NUM>, and the second airflow channel <NUM> is led from the top of the heating member <NUM> to the bottom of the aerosol-generating substrate <NUM>. In some embodiments, the shape and distribution of the protrusions <NUM> are not limited to the foregoing manners, and may alternatively be in other manners.

As illustrated in <FIG>, in some embodiments, a first limiting member <NUM> is disposed between the outer surface of the first sidewall <NUM> and the inner surface of the second sidewall <NUM>. The first limiting member <NUM> limits the heating member <NUM> to the inside of the heating cavity <NUM>, such that the first airflow channel <NUM> is formed between the first sidewall <NUM> and the inner surface of the heating cavity <NUM>.

In the present embodiment, the first limiting member <NUM> is circumferentially sleeved on the outer surface of the first sidewall <NUM>, such that there is a gap between the first sidewall <NUM> and the heating cavity <NUM>, and the first airflow channel <NUM> is formed between the first sidewall <NUM> and the inner surface of the heating cavity <NUM>. The first limiting member <NUM> includes an air hole, and the air hole in the first limiting member <NUM> enables air to flow in from the second opening <NUM>, and then flow through the first airflow channel <NUM> via the air hole in the first limiting member <NUM>, and finally flow to the bottom of the aerosol-generating substrate <NUM>.

The quantity of the first limiting members <NUM> may be one or more. In the present embodiment, there are two first limiting members <NUM>, which are respectively disposed at one end close to the second opening <NUM> and one end away from the second opening <NUM>, and simultaneously limit an upper end and a lower end of the heating member <NUM>, such that an airflow is able to flow from the upper end of the heating member <NUM> into the first airflow channel <NUM>, and is able to flow from the lower end of the heating member <NUM> into the bottom of the aerosol-generating substrate <NUM>.

The first limiting member <NUM> may be a rubber ring, and the first limiting member <NUM> may be fastened between the heating base <NUM> and the heating member <NUM> in a close fitting and bonding manner. Alternatively, the first limiting member <NUM> is protruded on the outer surface of the heating member <NUM>, and the first limiting member <NUM> and the outer surface of the heating member <NUM> are integrally formed. Alternatively, the first limiting member <NUM> is protruded on the inner surface of the heating cavity <NUM>, and the first limiting member <NUM> and the inner surface of the heating cavity <NUM> are integrally formed. In some embodiments, the first limiting member <NUM> is protruded on the inner surface of the heating cavity <NUM> or the outer surface of the heating member <NUM>, the shape and distribution of the first limiting member <NUM> are the same as those in the above manners in which the protrusion <NUM> is disposed. That is, the protrusion <NUM> is disposed on the outer surface of the heating member <NUM> to form the first limiting member <NUM>. The shape and distribution of the first limiting member <NUM> are not described herein again.

In some embodiments, there is a gap between the bottom wall <NUM> and the aerosol-generating substrate <NUM>, a third airflow channel <NUM> is formed between the bottom wall <NUM> and the aerosol-generating substrate <NUM>, and the third airflow channel <NUM> communicates with the first airflow channel <NUM> and the second airflow channel <NUM>. The third airflow channel <NUM> is disposed such that an airflow passing through the first airflow channel <NUM> and the second airflow channel <NUM> finally flows to one end of the aerosol-generating substrate <NUM> facing away from the third opening <NUM>.

In some embodiments, the first sidewall <NUM> abuts against the bottom wall <NUM>, and one end of the first sidewall <NUM> close to the bottom wall <NUM> has an opening, and the opening penetrates through the first sidewall <NUM> and communicates with the third airflow channel <NUM> and the first airflow channel <NUM>, such that the airflow of the first airflow channel <NUM> is able to lead to the third airflow channel <NUM>, and finally flows to one end of the aerosol-generating substrate <NUM> facing away from the third opening <NUM>.

In the present embodiment, the first limiting member <NUM> is disposed between the first sidewall <NUM> and the second sidewall <NUM>, and the first limiting member <NUM> is configured to limit a radial direction of the heating member <NUM> in the heating cavity <NUM>, such that the first sidewall <NUM> and the bottom wall <NUM> are disposed at an interval, and the third airflow channel <NUM> communicates with the first airflow channel <NUM>. The airflow of the first airflow channel <NUM> is able to lead to the third airflow channel <NUM>, and finally flow to one end of the aerosol-generating substrate <NUM> facing away from the third opening <NUM>.

In the present embodiment, a second limiting member <NUM> is protruded at one end of the bottom wall <NUM> opposite to the second opening <NUM>, the second limiting member <NUM> has a through hole, and a fourth opening <NUM> is formed at one end of the heating member <NUM> opposite to the third opening <NUM>. The second limiting member <NUM> is configured to limit the axial direction of the aerosol-generating substrate <NUM> in the heating cavity <NUM>. The aerosol-generating substrate <NUM> is inserted into the heating cavity <NUM> and abuts against the second limiting member <NUM>, such that a gap exists between the bottom of the aerosol-generating substrate <NUM> and the inner surface of the bottom wall <NUM>, and the third airflow channel <NUM> is formed. The airflow is able to flow from the first airflow channel <NUM> and the second airflow channel <NUM> into the third airflow channel <NUM>, and finally flows to the bottom of the aerosol-generating substrate <NUM>.

In some embodiments, the second limiting member <NUM> is disposed on the bottom wall <NUM>, a part or an entirety of the second limiting member <NUM> protrudes into the fourth opening <NUM> and abuts against the bottom of the aerosol-generating substrate <NUM>, or one end of the second limiting member <NUM> close to the fourth opening <NUM> is flush with the fourth opening <NUM> and abuts against the bottom of the aerosol-generating substrate <NUM>. That is, the height of the second limiting member <NUM> is higher than or equal to the distance between the fourth opening <NUM> and the bottom of the heating cavity <NUM>. In this way, one end of the aerosol-generating substrate <NUM> away from the fourth opening <NUM> is able to be disposed inside the heating member <NUM>, and the first airflow channel <NUM> and the second airflow channel <NUM> is able to be more fully used, such that overall temperature distribution of the aerosol-generating substrate <NUM> is more uniform. The maximum height of the second limiting member <NUM> may not be excessively high, the aerosol-generating substrate <NUM> is able to be fully baked, and the first airflow channel <NUM> and the second airflow channel <NUM> are fully used.

In some embodiments, the second limiting member <NUM> may be protruded at one end of the first sidewall <NUM> close to the bottom wall <NUM>, and the second limiting member <NUM> abuts against the bottom surface of the aerosol-generating substrate <NUM>, such that the aerosol-generating substrate <NUM> is limited in the heating member <NUM>. The first limiting member <NUM> limits the heating member <NUM> in the axial direction of the heating cavity <NUM>. And at the same time, the aerosol-generating substrate <NUM> is limited in the heating cavity <NUM>, such that a gap exists between the bottom of the aerosol-generating substrate <NUM> and the inner surface of the bottom wall <NUM>, and the third airflow channel <NUM> is formed. The airflow is able to flow from the first airflow channel <NUM> and the second airflow channel <NUM> into the third airflow channel, and finally flows to the bottom of the aerosol-generating substrate <NUM>.

Claim 1:
An aerosol-generating device (<NUM>), comprising:
a heating base (<NUM>), comprising a heating cavity (<NUM>); and
a heating member (<NUM>), configured to accommodate and heat an aerosol-generating substrate (<NUM>), wherein the heating member (<NUM>) is disposed in the heating cavity (<NUM>);
wherein the heating member (<NUM>) comprises a first sidewall (<NUM>), and a first airflow channel (<NUM>) is formed between the first sidewall (<NUM>) and the inner surface of the heating cavity (<NUM>) characterised in that at least one protrusion (<NUM>) is disposed on the inner surface of the first sidewall (<NUM>), the protrusion (<NUM>) is configured to make a second airflow channel (<NUM>) formed between the first sidewall (<NUM>) and the aerosol-generating substrate (<NUM>), and both the first airflow channel (<NUM>) and the second airflow channel (<NUM>) are led from the outside of the aerosol-generating device (<NUM>) to the bottom of the heating cavity (<NUM>).