Heating assembly and aerosol generating device

Abstract

The utility model relates to the technical field of aerosol generation, and particularly discloses a heating assembly and an aerosol generation device. An assembly for heating an aerosol-generating article to generate an aerosol, the assembly comprising a support tube and a microwave antenna; a support tube defining a heating chamber for accommodating at least a portion of the aerosol-generating product; the microwave antenna is arranged on the inner surface of the supporting pipe, at least part of the microwave antenna surrounds the heating cavity or defines at least part of the boundary of the heating cavity, and the microwave antenna is used for emitting radio frequency energy into the heating cavity so as to conduct radiation heating on at least one part of the aerosol generating product located in the heating cavity. According to the assembly, the design that the microwave antenna is fixed in the supporting pipe is adopted, so that the microwave antenna can perform direct contact heating and radiation heating on the aerosol generating product, the microwave heating efficiency is improved, and power dissipation in the heat preservation stage is reduced.

Description

Technical Field

[0001] This application relates to the technical field of aerosol generation, and particularly to a heating component and an aerosol generating device. Background Art

[0002] The combustion temperature of traditional cigarettes is generally about 900°C. During the combustion process, flue gas containing harmful chemical components is generated, which not only affects the physical health of smokers and surrounding people, but also causes environmental pollution. To help habitual smokers who want to quit smoking get rid of traditional tobacco products such as cigarettes, cigars, cigarillos and roll-your-own cigarettes, tobacco heating devices have gradually attracted people's attention. The tobacco heating device uses the method of heating tobacco instead of burning it, baking out the flavor substances in the tobacco to generate aerosol. Therefore, it will not cause high-temperature combustion of cigarettes, avoiding the generation of harmful substances and sidestream smoke, which is one of the important development directions of the future tobacco industry.

[0003] The tobacco heating device is essentially an aerosol generating device, which generates heat through a heater and heats the tobacco material by means of heat transfer or heat exchange. In order to improve the problems of low heating efficiency and uneven heating caused by the heat transfer method, an aerosol generating device using microwave heating method is provided in the prior art. As an example, a microwave absorber (or wave absorber) is mixed in the tobacco used in the aerosol generating device. The microwave absorber can quickly heat up by absorbing microwave energy, and the temperature rise of the microwave absorber is conducted to the tobacco, so that the tobacco is heated and aerosol is generated. At the same time, the aerosol generating device is provided with a resonant cavity, and the microwave conduction signal is fed into the resonant cavity through a dielectric antenna, and resonance is generated by reflecting back and forth on the inner wall of the resonant cavity, baking and heating the tobacco matrix material to generate aerosol; dielectric bodies are provided on the inner wall surface and the outer wall surface of the resonant cavity for efficiently absorbing microwave resonance energy.

[0004] However, the above aerosol generating device has the following defects:

[0005] 1) The microwave absorber (or wave absorber) added to the tobacco material of the aerosol generating article has very poor versatility in the market, increasing the use cost of the product;

[0006] 2) Under ideal conditions, preferably, the resonance heating efficiency in a closed metal cavity is relatively high. However, the aerosol generating article is cylindrical, and the heating cavity of the above aerosol generating device needs to be designed with an opening for the aerosol generating article to be inserted, which causes the resonant cavity to be unable to be completely closed during the use of the device, resulting in a serious reduction in the microwave heating efficiency. And the production consistency of such aerosol generating devices with resonant cavities is poor, there is a problem of high microwave reflection power, and it is very difficult to adjust the return loss of the radio frequency signal through the dielectric antenna to the optimal value, resulting in high power consumption and reduced battery life during the use of the device.

[0007] Application content

[0008] The purpose of the present utility model is to provide a heating component and an aerosol generating device that replace the resonant cavity heating method, improve the microwave heating efficiency of the aerosol generating device and reduce power consumption.

[0009] To achieve this purpose, the present utility model adopts the following technical solutions:

[0010] At least one embodiment of the present application provides a heating component for heating an aerosol generating article to generate an aerosol, including a support tube defining a heating cavity for accommodating at least a part of the aerosol generating article; a microwave antenna disposed on the inner surface of the support tube, the microwave antenna at least partially surrounding the heating cavity or defining at least a part of the boundary of the heating cavity, and the microwave antenna for emitting radio frequency energy into the heating cavity, thereby radiatively heating at least a part of the aerosol generating article located in the heating cavity.

[0011] As a preferred technical solution of the heating component, the microwave antenna is formed by winding a planar microwave antenna.

[0012] As a preferred technical solution of the heating component, the support tube includes a first support portion and a second support portion connected to each other. The first support portion is located at one end where the aerosol generating article is inserted. The inner diameter of the first support portion is smaller than the inner diameter of the second support portion. A step is formed at the connection of the first support portion and the second support portion, and the microwave antenna abuts against the step.

[0013] As a preferred technical solution of the heating component, a metal layer is provided between the support tube and the microwave antenna.

[0014] As a preferred technical solution of the heating component, the support tube is a ceramic tube or a polyether ether ketone tube.

[0015] As a preferred technical solution of the heating component, the microwave antenna is a cupronickel sheet.

[0016] As a preferred technical solution of the heating component, the microwave antenna is in a sheet shape, and the thickness of the microwave antenna is 0.2 mm to 0.7 mm.

[0017] As a preferred technical solution of the heating component, the microwave antenna has a first through groove and a second through groove extending circumferentially and parallel to each other, and part of the support tube is exposed to the first through groove and the second through groove.

[0018] As a preferred technical solution of the heating component, the width of the first through groove is greater than the width of the second through groove.

[0019] As a preferred technical solution of the heating component, the microwave antenna is provided with a feeding end for connecting to the output end of the radio frequency energy and a grounding end for connecting to the antenna reference ground, and the feeding end and the grounding end are respectively located on both sides of the opening of the first through slot or the second through slot.

[0020] As a preferred technical solution of the heating component, the support tube includes a first through hole and a second through hole, the feeding end is exposed in the first through hole, and the grounding end is exposed in the second through hole.

[0021] As a preferred technical solution of the heating component, the microwave antenna is in a Z shape or an F shape.

[0022] As a preferred technical solution of the heating component, the support tube further includes a third through hole, and the microwave antenna includes a pad for connecting to a temperature sensor, and the pad is exposed in the third through hole.

[0023] As a preferred technical solution of the heating component, the planar microwave antenna has opposite first and second side edges in the circumferential direction, and the first side edge and the second side edge do not overlap with each other to form a gap.

[0024] As a preferred technical solution of the heating component, the planar microwave antenna is provided with a first through slot extending from the first side edge towards the second side edge, and there is a distance between the first through slot and the second side edge.

[0025] As a preferred technical solution of the heating component, the planar microwave antenna is further provided with a second through slot extending from the second side edge towards the first side edge, there is a distance between the second through slot and the first side edge, and the second through slot and the first through slot are longitudinally offset.

[0026] As a preferred technical solution of the heating component, the distance between the first through slot and the second side edge is greater than the distance between the second through slot and the first side edge.

[0027] As a preferred technical solution of the heating component, the planar microwave antenna includes a grounding end and a feeding end, and both the grounding end and the feeding end are located on the first side edge, or both the grounding end and the feeding end are located on the second side edge.

[0028] As a preferred technical solution of the heating component, the height of the planar microwave antenna along the longitudinal direction of the support tube is 15 mm - 19 mm, or the width of the planar microwave antenna after being unfolded in the circumferential direction is 17 mm - 23 mm.

[0029] An aerosol generating device includes a circuit board assembly and the above-mentioned heating component, and the circuit board assembly is used to supply electrical energy to the heating component.

[0030] Advantages of the present utility model:

[0031] The heating component adopts a design in which the microwave antenna is fixed inside the support tube and surrounds the heating cavity. The heating cavity is used to accommodate and heat the aerosol generating article, enabling the microwave antenna to directly radiate heat to the aerosol generating article. Among them, the radio frequency energy of the microwave will be radiated in the near field of the microwave antenna after being transmitted through the connector. Since the matrix material of the aerosol generating article contacts or is close to the microwave antenna, there is no or very little absorption or attenuation of the radio frequency energy by the intermediate medium material during the heating process; this can greatly improve the microwave heating efficiency and reduce the power dissipation during the heat preservation stage. The microwave antenna preferably adopts a planar antenna that is curled around the heating cavity, mainly feeding the radio frequency energy towards the inside of the heating cavity in the radial direction, thus reducing the influence of the end opening of the heating cavity on the microwave heating efficiency.

[0032] In addition, the structural positioning of the support tube sleeved on the microwave antenna ensures the determination of the relative position between the two, facilitating the adjustment of the position of the area with the maximum radiation energy of the microwave antenna, contributing to heating the middle part of the aerosol generating article by the heating component, thereby improving the heating effect and enhancing the stability and reliability of the long-term operation of the microwave heating cavity. The above support tube and microwave antenna are integrated into an overall structure, simplifying the structural complexity of the heating component and facilitating the realization of the miniaturized design of the heating component.

[0033] The aerosol generating device powers the heating component through the circuit board component, enabling the microwave antenna to feed microwaves into the heating cavity, so that the microwave heating of the aerosol generating article can be successfully completed in the heating cavity, achieving the design purpose of heating the aerosol generating article to generate aerosol. The aerosol generating device has a simple and reliable structure, occupies a small space, has high working stability and a long service life. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the heating component provided by an embodiment of the present utility model;

[0035] Figure 2 is a schematic structural diagram of the heating component provided by an embodiment of the present utility model.

[0036] Figure 3 is a sectional view of the heating component provided by an embodiment of the present utility model;

[0037] Figure 4 is an unfolded view of the microwave antenna provided by an embodiment of the present utility model;

[0038] Figure 5 is a schematic structural diagram of the heating module and the aerosol generating article provided by an embodiment of the present utility model;

[0039] Figure 6It is an exploded view of the heating module provided by an embodiment of the present utility model;

[0040] Figure 7 It is a schematic structural diagram of an aerosol generating device and an aerosol generating article provided by an embodiment of the present utility model;

[0041] Figure 8 It is a sectional view of an aerosol generating device and an aerosol generating article provided by an embodiment of the present utility model;

[0042] Figure 9 It is an exploded view of an aerosol generating device and an aerosol generating article provided by an embodiment of the present utility model;

[0043] Figure 10 It is a signal transmission schematic diagram of a microwave generating circuit according to an embodiment of the present utility model;

[0044] Figure 11 It is Figure 10 One of the signal transmission schematic diagrams of the microwave generating circuit;

[0045] Figure 12 It is Figure 10 Another signal transmission schematic diagram of the microwave generating circuit;

[0046] Figure 13 It is an electric field simulation diagram of a planar microwave antenna according to an embodiment of the present utility model;

[0047] Figure 14 It is a magnetic field simulation diagram of a planar microwave antenna according to an embodiment of the present utility model.

[0048] In the figure:

[0049] 100. Heating module;

[0050] 110. Heating component;

[0051] 111. Microwave antenna; 1111. First through groove; 1112. Second through groove; 1113. Ground end; 1114. Feeding end; 1115. First side; 1116. Second side; 11171. First part; 11172. Second part; 11173. Third part; 1118. Pad;

[0052] 112. Support tube; 1121. Heating cavity; 1122. First support part; 1123. Second support part; 1124. Step; 1125. First through hole; 1126. Second through hole; 1127. Third through hole; 1128. Metal layer; 1129. Rib; 120. Module housing;

[0053] 200. Circuit board assembly;

[0054] 300. Device housing;

[0055] 400, aerosol generating device;

[0056] 900, aerosol generating article. Detailed implementation manners

[0057] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0058] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0059] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0060] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0061] As used herein, the term "aerosol-generating article 900" refers to an article that includes an aerosol-forming substrate, which is intended to be heated rather than burned to release volatile compounds that can form an aerosol. Compared to aerosols produced by burning or pyrolytic degradation of the aerosol-forming substrate, aerosols formed by heating the aerosol-forming substrate may contain fewer known harmful components. In one embodiment, the aerosol-generating article 900 is removably connectable to the aerosol-generating device 400.

[0062] The aerosol-forming substrate preferably uses a tobacco-containing material that releases volatile compounds from the substrate upon heating; it can also be a non-tobacco material suitable for electric heating and smoking. The aerosol-forming substrate preferably uses a solid substrate, which can include one or more of powder, granule, fragment, strip, ribbon or flake of vanilla leaf, tobacco leaf, homogenized tobacco, expanded tobacco, etc.; alternatively, the solid substrate can contain additional tobacco or non-tobacco volatile flavor compounds to be released when the substrate is heated. A suitable aerosol-forming substrate can be a cigarette filled with tobacco material.

[0063] In other embodiments, the term "aerosol-generating article 900" refers to a container or cartridge capable of being filled with an aerosol-forming substrate, or other carrier capable of holding the aerosol-forming substrate. The aerosol-forming substrate contained in the aerosol-generating article 900 can be a liquid component or a combination of a liquid component and a solid component. For example, suitable aerosol-forming substrates include, but are not limited to: polyols, such as triethylene glycol, 1,3-butanediol and glycerol; esters of polyols, such as glycerol mono-, di- or triacetate; and fatty acid esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. The preferred aerosol-forming substrate is a polyhydric alcohol or a mixture thereof, such as triethylene glycol, 1,3-butanediol and most preferably glycerol. The aerosol-forming substrate can include other additives and ingredients, such as flavors. In some alternative examples, the aerosol-generating article 900 further includes a liquid holding element for adsorbing and holding the liquid substrate. Suitable liquid holding elements are prepared from flexible fibers such as cotton fibers, non-woven fabrics, sponges, etc. In other examples, the liquid holding element is composed of porous materials such as microporous ceramics, microporous glass or microporous metal.

[0064] As used herein, the term "aerosol-generating device 400" is a device that engages or interacts with the aerosol-generating article 900 to form an inhalable aerosol.

[0065] The aerosol-generating device 400 includes a heating assembly 110, which is used to heat the aerosol-forming substrate of the aerosol-generating article 900 to generate an aerosol.

[0066] As Figures 1 to 3As shown in the figure, an embodiment of the present application provides a heating component 110 for heating an aerosol-generating article 900 to generate an aerosol, including a support tube 112 and a microwave antenna 111; the support tube 112 defines a heating cavity 1121 for accommodating at least a part of the aerosol-generating article 900; the microwave antenna 111 is disposed on the inner surface of the support tube 112, and the microwave antenna 111 at least partially surrounds the heating cavity 1121 or defines at least a part of the boundary of the heating cavity 1121, and the microwave antenna 111 is configured to emit radio frequency energy into the heating cavity 1121, so as to radiatively heat at least a part of the aerosol-generating article 900 located in the heating cavity 1121.

[0067] It can be understood that different matrix materials in the aerosol-generating article 900 can absorb microwave radio frequency energy to different degrees, and the matrix material is coupled with the microwave electromagnetic field to achieve the purpose of energy conversion. The process of microwave electromagnetic field energy conversion includes, but is not limited to, ways such as ionic conduction, dipole rotation, and interfacial polarization. The aerosol-forming matrix absorbs microwave electromagnetic field energy through ways such as ionic conduction and dipole rotation and converts it into heat, so that its own overall temperature rises to generate an aerosol. Compared with the traditional heating method, the heating method of the present application does not rely on heat transfer and convective radiation, reduces the temperature gradient in the aerosol-forming matrix during the heating process, and has the advantages of fast heating speed and high temperature uniformity.

[0068] The heating component 110 adopts a design in which the microwave antenna 111 is fixed inside the support tube 112, and the heating cavity 1121 is used to accommodate and heat the aerosol-generating article 900, so that the microwave antenna 111 can directly contact and radiatively heat the aerosol-generating article 900. Among them, the microwave-conducted energy will be radiated in the near field through the connector and then through the microwave antenna 111. Since the matrix material of the aerosol-generating article 900 contacts or is close to the microwave antenna, there is no or very little absorption or attenuation of radio frequency energy by the intermediate dielectric material during the heating process; the microwave heating efficiency can be greatly improved, and the power dissipation during the heat preservation stage can be reduced. The microwave antenna 111 preferably adopts a planar antenna that is curled around the heating cavity, mainly concentrating on feeding radio frequency energy radially into the heating cavity 1121, so as to reduce the influence of the end opening of the heating cavity on the microwave heating efficiency. At the same time, the structural positioning of the support tube 112 sleeved on the microwave antenna 111 ensures the determination of the relative position between the two, which is convenient for adjusting the position of the area with the maximum radiated energy of the microwave antenna 111, helps the heating component 110 to heat the middle part of the aerosol-generating article 900, thereby improving the heating effect, and improving the stability and reliability of the long-term operation of the microwave heating cavity 1121. The above-mentioned support tube 112 and microwave antenna 111 are integrated into an overall structure, which simplifies the structure of the heating component 110 and helps to realize the miniaturized design of the heating component 110.

[0069] In this embodiment, the support tube 112 includes a first support portion 1122 and a second support portion 1123 that are connected to each other. The first support portion 1122 is located on the side where the aerosol-generating article 900 is inserted. The inner diameter of the first support portion 1122 is smaller than the inner diameter of the second support portion 1123. A step 1124 is formed at the connection between the first support portion 1122 and the second support portion 1123, and the microwave antenna 111 abuts against the step 1124.

[0070] Specifically, the heating cavity 1121 has a first opening and a second opening. The first opening is provided in the first support portion 1122, and the second opening is provided in the second support portion 1123. One end of the microwave antenna 111 close to the first opening fits on the step 1124 (i.e., the inner wall step surface of the support tube 112), and the inner diameter of the microwave antenna 111 is greater than or equal to the inner diameter of the support tube 112 at the first opening. In an exemplary embodiment, when the microwave antenna 111 is installed into the second support portion 1123, its inner surface smoothly transitions with the inner surface of the first support portion 1122 to ensure the smooth insertion of the aerosol-generating article.

[0071] With the above limitations, the installation difficulty of the microwave antenna 111 in the support tube 112 is reduced, ensuring that the support tube 112 can be stably installed in place, and guaranteeing the heating effect of the heating assembly 110 on the aerosol-generating article 900. By limiting the inner diameter size, the situation where the microwave antenna 111 stops the aerosol-generating article 900 can be avoided, reducing the risk of damage to the microwave antenna 111 and the difficulty for the smoker to insert the aerosol-generating article 900, which helps to improve the smoker's usage experience.

[0072] Furthermore, the step 1124 is annular, and the microwave antenna 111 is arranged to surround the inner surface of the support tube 112. That is, the inscribed circles of the cross-sections of the first support portion 1122 and the second support portion 1123 are concentrically arranged. The above limitations further reduce the assembly difficulty of the microwave antenna 111 in the support tube 112, simplify the specific structure inside the support tube 112, reduce the production cost of the support tube 112, and optimize the specific structure of the heating assembly 110.

[0073] In this embodiment, the step 1124 is machined on the inner wall of the support tube 112. The inner diameter size of the microwave antenna 111 needs to be selected after considering the thickness that bulges after brazing connection. After metallizing the surface of the support tube 112, the support tube 112 and the microwave antenna 111 are fixed using a fixture, and then the microwave antenna 111 is inserted through the support tube 112. After ensuring that the microwave antenna 111 is fixed in the ideal position and shape, a high-temperature brazing fixing operation is performed.

[0074] In some embodiments, a protective layer such as a glaze layer is provided on the side of the microwave antenna 111 facing away from the support tube 112. As an example, the protective layer generally has a thickness of only 0.1 mm - 0.5 mm, and the attenuation effect on the microwave radio frequency signal is extremely small. The above-mentioned protective layer can ensure that the aerosol generating article 900 can be smoothly inserted into or removed from the heating cavity 1121 through its smooth inner surface, and at the same time can prevent residues and liquids generated by the matrix material from corroding the microwave antenna 111 during long-term use, thereby affecting the performance of the microwave antenna 111.

[0075] In some embodiments, the support tube 112 is a ceramic tube, a quartz glass tube or a polyether ether ketone tube. The material of the support tube 112 can also be other plastics that can withstand high temperatures. As an alternative example, a metal layer 1128 is provided between the support tube 112 and the microwave antenna 111. The metal layer 1128 can improve the bonding force between the microwave antenna 111 and the support tube 112. In addition, the metal layer 1128 can also concentrate the radiation energy in the heating cavity through emission and other means, improving the heating efficiency. For example, when the material of the support tube 112 is ceramic, the surface of the support tube 112 is metallized to obtain the metal layer 1128, and the metal layer 1128 acts as a pad, facilitating the connection of the microwave antenna 111 to the support tube 112 by welding to the metal layer 1128, reducing the difficulty of subsequent welding operations. Another example is that when the material of the support tube 112 is polyether ether ketone, the microwave antenna 111 is in interference fit with the support tube 112, and the microwave antenna 111 can be in interference fit with polyether ether ketone during the assembly process.

[0076] In some other embodiments of the present application, the microwave antenna 111 can be integrated on the inner surface of the support tube 112 to form an integral structure by means including but not limited to electroplating, printing, spraying, vapor deposition, sintering molding, in-mold injection molding, etc. For example, when the material of the support tube 112 is ceramic, the microwave antenna 111 can be sintered together with the ceramic slurry, so that the microwave antenna 111 is disposed inside the ceramic tube. For example, when the material of the support tube 112 is plastic, the plastic can be molded around the microwave antenna in a mold to form a whole.

[0077] In one embodiment of the present application, the microwave antenna 111 is a cupronickel sheet. In another embodiment of the present application, the microwave antenna 111 includes a flexible printed circuit board (FPC).

[0078] In one embodiment of the present application, the microwave antenna 111 is sheet-shaped, and the thickness of the microwave antenna 111 is from 0.2 mm to 0.7 mm. Optionally, the thickness of the microwave antenna 111 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm or 0.7 mm. By defining the material and thickness of the microwave antenna 111, the heating effect and radiation effect of the microwave antenna 111 are ensured, and it is ensured that the microwave antenna 111 can smoothly perform direct contact heating and radiation heating on the aerosol generating article 900. In addition, since the microwave antenna 111 is a planar wire or strip wire and has a certain width, compared with the traditional spiral antenna with a linear trace, the microwave antenna 111 in the present application can provide a larger area of radiation projection in the heating cavity, which is beneficial to improving the microwave heating efficiency of the heating component 110.

[0079] Further, the microwave antenna 111 is brazed to the metal layer 1128. The ceramic tube and the polyether ether ketone tube have low production costs, high working stability and long service life. At the same time, the heat conduction performance of polyether ether ketone and ceramic is weaker than that of metal materials, which can effectively curb the leakage of heat in the heating cavity 1121, thereby effectively improving the heat preservation ability of the heating component 110, helping to improve the microwave heating efficiency of the heating component 110, and reducing the power dissipation of the heating component 110 during the heat preservation stage. Brazing connection has the advantages of high reliability, wide adaptability, simple processing and controllable quality, which helps to achieve a long-term stable connection between the microwave antenna 111 and the support tube 112. With the setting of the metal layer 1128, the connection effect between the microwave antenna 111 and the support tube 112 can be guaranteed, thereby ensuring the long-term stable operation of the heating component 110.

[0080] In this embodiment, the microwave antenna 111 has a first through groove 1111 and a second through groove 1112 that extend circumferentially and are parallel to each other, and part of the support tube 112 is exposed in the first through groove 1111 and the second through groove 1112. In some embodiments, the shape of the microwave antenna 111 is Z-shaped or F-shaped, and it is wound around the inner surface of the support tube 112 to form an annular strip. As an optional example, the microwave antenna 111 may be a Planar Inverted-F Antenna (PIFA). Using a PIFA antenna is beneficial for reducing the volume of the heating component 110. In some embodiments, the microwave antenna 111 is Z-shaped. The above design defines the specific structure of the microwave antenna 111, ensures the stable operation of the microwave antenna 111, ensures that the microwave antenna 111 can smoothly feed microwaves into the heating cavity 1121, and guarantees the heating effect of the heating component 110 on the aerosol generating article 900.

[0081] In some embodiments, the microwave antenna 111 is flexible and rollable. The microwave antenna 111 includes a flexible thin film and a conductor material carried on the flexible thin film. The conductor material has certain corrosion resistance and good electrical conductivity, including but not limited to metal materials such as aluminum, copper, tungsten, and alloys. For example, a suitable microwave antenna 111 can be a flexible printed circuit board (FPC). Or in some other examples, the microwave antenna 111 can be a phosphor bronze sheet. The FPC and the phosphor bronze sheet are soft in material, so the microwave antenna 111 can be bent to enable the microwave antenna 111 to surround and fit the support tube 112. In some exemplary embodiments, the heating assembly 110 further includes a positioning component for holding the FPC or the phosphor bronze sheet on the inner surface of the support tube 112 without displacement. Commonly used positioning components include heat shrink tubes and high-temperature resistant tapes, etc.

[0082] In an embodiment of the present application, when the microwave antenna 111 is mounted on the inner surface of the support tube 112. In an embodiment of the present application, the conductor material of the microwave antenna 111 is integrated on the support tube 112. In some alternative embodiments, the microwave antenna 111 includes a film layer structure of the conductor material, and the film layer structure has a specific pattern shape (refer to Figure 4 ), and the film layer structure can be combined and integrated on the inner surface of the support tube by means such as but not limited to printing, spraying, etching, or vapor deposition.

[0083] The width and height of the microwave antenna 111 after unfolding are matched with the outer diameter and the longitudinal length of the support tube 112. In this embodiment, the circumferential width of the microwave antenna 111 is smaller than the circumference of the support tube 112, so as to ensure that the microwave antenna 111 can just be mounted on the surface of the support tube 112. At the same time, the two side edges of the planar microwave antenna 111 in the width direction will not overlap when the microwave antenna 111 surrounds and is arranged on the outer wall of the support tube 112, avoiding the overlapping part from affecting the radiation efficiency of the microwave antenna 111. In the height direction, the microwave antenna 111 can basically cover or partially cover the longitudinal length of the support tube 112; it can be understood that the height of the microwave antenna 111 is matched with the length of the aerosol generation matrix section in the aerosol generation article 900, so that the radiation area of the antenna can effectively cover the matrix material.

[0084] It can be understood that for the planar microwave antenna 111 in a surrounding form, providing an appropriate inner diameter and longitudinal height is helpful for improving the heating efficiency. In a suitable embodiment, such as Figures 1 - 3As shown, in this embodiment, the height of the microwave antenna 111 along the longitudinal direction of the support tube 112 is 15 mm - 19 mm, and the width of the microwave antenna 111 after circumferential expansion is 17 mm - 23 mm. Furthermore, the formed tubular antenna has an appropriate inner diameter, so that the axial center of the aerosol generating matrix in the heating cavity during operation can also have an electric field or magnetic field intensity sufficient to volatilize one or more components in the matrix material, which is beneficial to improving the heating uniformity of the aerosol generating matrix.

[0085] Furthermore, the microwave antenna 111 is provided with a feeding end 1113 for connecting the output end of the radio frequency energy and a grounding end 1114 for connecting the antenna reference ground. The feeding end 1113 and the grounding end 1114 are respectively located on both sides of the opening of the first through slot 1111 or the second through slot 1112. The above design realizes the layout of the positions of the feeding end 1113 and the grounding end 1114, reduces the difficulty of the welding operation, ensures the smooth connection between the microwave antenna 111 and the external environment, and further ensures the long-term stable operation of the heating assembly 110.

[0086] In an embodiment of the present application, the microwave antenna 111 has opposite first side edges 1115 and second side edges 1116 in the circumferential direction. The first side edge 1115 and the second side edge 1116 do not overlap with each other, thus forming a gap. Because the two side edges of the microwave antenna 111 along the length direction X overlap when the microwave antenna 111 is wound around the outer wall of the support tube 112, the overlapping part will affect the return loss of the microwave antenna 111, resulting in a serious impact on the energy transmission efficiency of the radio frequency radiation. Therefore, as Figures 1 - 2 shown, the first side edge 1115 and the second side edge 1116 of the microwave antenna 111 in this embodiment do not overlap and have a gap.

[0087] In an embodiment of the present application, as Figure 2 shown, the support tube 112 further includes a rib 1129. The rib 1129 is located between the first side edge 1115 and the second side edge 1116. The design of the rib 1129 can play a positioning role when the microwave antenna 111 is installed on the support tube 112, so that the feeding end 1113 is exposed to the first through hole 1125 and the grounding end 1114 is exposed to the second through hole 1126 after the microwave antenna 111 is installed on the support tube 112.

[0088] In an embodiment of the present application, the microwave antenna 111 includes a first part 11171, a second part 11172, and a third part 11173 separated by the first through slot 1111 and the second through slot 1112. The dimensions of the first part 11171, the second part 11172, and the third part 11173 in the direction perpendicular to the first through slot 1111 and the second through slot 1112 are L1, L2, and L3 respectively, and L3 > L1 > L2.

[0089] In one embodiment of the present application, the microwave antenna 111 is provided with a first through slot 1111 extending from the first side 1115 towards the second side 1116, and there is a spacing L4 between the first through slot 1111 and the second side 1116. In one embodiment of the present application, the microwave antenna 111 is further provided with a second through slot 1112 extending from the second side 1116 towards the first side 1115. There is a spacing L5 between the second through slot 1112 and the first side 1115, and the second through slot 1112 is longitudinally offset from the first through slot 1111. In one embodiment of the present application, the spacing L4 between the first through slot 1111 and the second side 1116 is greater than the spacing L5 between the second through slot 1112 and the first side 1115.

[0090] In one embodiment of the present application, the microwave antenna 111 is provided with a first through slot 1111 and a second through slot 1112 that extend along the circumferential direction or the unfolding width direction and are parallel to each other, and a part of the support tube 112 is exposed in the first through slot 1111 and the second through slot 1112. In one embodiment of the present application, the width L6 of the first through slot 1111 is greater than the width L7 of the second through slot 1112.

[0091] As shown in Figure 4 In some embodiments, the microwave antenna 111 is Z-shaped. That is, the first through slot 1111 and the second through slot 1112 respectively extend from the left edge and the right edge of the microwave antenna 111 towards the center, and the first through slot 1111 and the second through slot 1112 are located in the middle of the microwave antenna 111 in the height direction Y. In one embodiment of the present application, the microwave antenna 111 can be F-shaped.

[0092] In one embodiment of the present application, as shown in Figure 4 The microwave antenna 111 includes a grounding end 1113 and a feeding end 1114. The grounding end 1113 and the feeding end 1114 are respectively located on both sides of the opening of the first through slot 1111, and the electromagnetic wave radiation of the microwave antenna 111 is the strongest near the first through slot 1111. For example, refer to the electric field distribution diagram of the heating component when it is powered on as shown in Figure 13 and the magnetic field distribution diagram as shown in Figure 14 When the grounding end 1113 and the feeding end 1114 are located on both sides of the opening of the first through slot 1111, the electric field intensity and the magnetic field intensity of the microwave antenna 111 near the first through slot 1111 are the highest. As a preferred example, the first through slot 1111 is generally opened at the middle position of the longitudinal height of the microwave antenna 111 (see Figure 4)。According to the established length of the aerosol - generating substrate, it can be designed such that the first through - slot 1111 is positioned at a specific position in the longitudinal direction of the heating chamber, so that during the use of the aerosol - generating device, when the aerosol - generating article 900 is inserted into the heating chamber, the first through - slot 1111 can be longitudinally aligned with the middle position of the aerosol - generating substrate basically, thereby maximizing the absorption of radio - frequency energy and facilitating the increase in the heating rate of the aerosol - generating substrate. Or in some alternative embodiments, the grounding end 1113 and the feeding end 1114 are respectively located on both sides of the opening of the second through - slot 1112.

[0093] In one embodiment of the present application, the microwave antenna 111 includes a grounding end 1113 and a feeding end 1114. Both the grounding end 1113 and the feeding end 1114 are located on the first side 1115, or both the grounding end 1113 and the feeding end 1114 are located on the second side 1116, that is, both the grounding end 1113 and the feeding end 1114 are located on the same side of the microwave antenna 111. In one embodiment of the present application, the aerosol - generating article 900 includes a filter segment and a smoking segment connected to each other. The filter segment is for the user to hold in the mouth, and the smoking segment includes a smoking substance. After being heated by the heating assembly 110, the smoking segment can generate an aerosol for the user to inhale. In one embodiment of the present application, the energy of the microwave is the highest at the first through - slot 1111 or the second through - slot 1112 provided with the feeding end 1113 and the grounding end 1114, and the middle part of the smoking segment of the aerosol - generating article 900 corresponds to the position of the first through - slot 1111 or the second through - slot 1112 provided with the feeding end 1113 and the grounding end 1114, so that the middle part of the smoking segment of the aerosol - generating article 900 absorbs the most microwave energy, which is beneficial to the rapid generation of aerosol in the smoking segment.

[0094] Furthermore, the support tube 112 includes a first through - hole 1125 and a second through - hole 1126 that penetrate the inner and outer sides. The feeding end 1113 is exposed in the first through - hole 1125, and the grounding end 1114 is exposed in the second through - hole 1126, which is convenient for welding the radio - frequency cable of the microwave antenna to the feeding end 1113 and the grounding end 1114; the support tube 112 further includes a third through - hole 1127. The microwave antenna 111 includes a pad 1118 for connecting a temperature sensor, and the pad 1118 is exposed in the third through - hole 1127. The temperature sensor is connected to the pad 1118 through the third through - hole 1127, so that the temperature sensor can sense the temperature of the heating assembly 110.

[0095] By setting the first through hole 1125 and the second through hole 1126, the integration difficulty of the pad on the heating component 110 is reduced, thereby simplifying the specific structure of the heating component 110, improving the structural stability of the heating component 110, reducing the difficulty of the pad detaching from the heating component 110 due to accidents, prolonging the service life of the heating component 110, ensuring the long-term stable operation of the heating component 110, and ensuring the smooth connection between the remaining components and the heating component 110.

[0096] Specifically, three cables are correspondingly welded to the feed end 1113, the ground end 1114, and the pad 1115.

[0097] In this embodiment, the antenna reference ground and the output end of the radio frequency energy are conventional settings in the art. Their setting purposes and specific connection methods are common knowledge in the art and are well-known to those skilled in the art, so no further elaboration will be provided here.

[0098] As Figures 7 to 9 shown, this embodiment also provides an aerosol generating device 400, which includes a circuit board assembly 200 and the above-mentioned heating component 110. The circuit board assembly 200 is used to supply electrical energy to the heating component 110.

[0099] This aerosol generating device 400 supplies power to the heating component 110 through the circuit board assembly 200, enabling the microwave antenna 111 to feed microwaves into the heating chamber 1121, so that the microwave heating of the aerosol generating article 900 can be successfully completed in the heating chamber 1121, achieving the design purpose of heating the aerosol generating article 900 to generate aerosol. The structure of this aerosol generating device 400 is simple and reliable, occupies a small space, has high working stability, and has a long service life.

[0100] The heating component 110 is installed in the module housing 120. The module housing 120 is composed of multiple components spliced together and is used to protect the heating component 110. Both the heating component 110 and the module housing 120 belong to the heating module 100.

[0101] The aerosol generating device 400 further includes a device housing 300. The heating module 100 and the circuit board assembly 200 are both installed in the device housing 300. The device housing 300 is composed of multiple components spliced together and is used to protect the heating module 100 and the circuit board assembly 200.

[0102] In some embodiments, this aerosol generating device 400 can be a heat-not-burn aerosol generating device 400 and can be handheld. It can be used to heat an aerosol generating article 900 containing solid tobacco, such as a cigarette.

[0103] In some embodiments, the aerosol generating device 400 uses microwave heating. Specifically, the aerosol generating device 400 includes a microwave antenna 111 disposed around the outer wall of the support tube 112. The microwave antenna 111 is electrically connected to the circuit board assembly 200. The circuit board assembly 200 is integrated with a microwave generating circuit and a controller. The controller is connected to the microwave generating circuit.

[0104] As Figure 10 shown, in some embodiments, the microwave generating circuit includes: an integrated chip, a circulator, a microstrip, a PI-type attenuator, a power detector, and a load. The circulator is installed outside the heating chamber 1121. The output end of the integrated chip is connected to the first end of the circulator. The second end of the circulator is connected to the microwave antenna 111. The microwave output by the integrated chip is fed into the microwave antenna 111 through the first end and the second end of the circulator. The aerosol generating matrix in the heating chamber 1121 is heated under the action of the microwave to release aerosol. The second end of the circulator can also receive the microwave signal fed back by the microwave antenna 111 and transmit the fed-back microwave signal through the second end of the circulator to the third end of the circulator.

[0105] The integrated chip outputs a radio frequency signal with a conduction frequency of f and a power of Pout to the first end of the circulator. The second end of the circulator outputs a radio frequency signal to the microwave antenna 111. Since the frequency of the microwave antenna 111 will shift, the microwave antenna 111 operates in a shifted broadband. The return loss of the microwave antenna 111 at different frequencies is different. Therefore, part of the radio frequency signal is reflected to the third end of the circulator and is absorbed by the high-power load.

[0106] As an optional example, the integrated chip is an oscillator power amplifier chip using a single integrated oscillation circuit and a 20-40W unipolar gallium nitride radio frequency power amplifier on a single substrate. The space occupied by the microstrip matching of the gate, drain, and feedback network outside the above integrated chip is very small, which is beneficial to the miniaturization of the product integration of the aerosol generating device 400. The power of the unipolar gallium nitride radio frequency power amplifier can also be selected as 20-25W, 25-30W, 30-35W, or 35-40W. In an embodiment of the present application, the integrated chip is a chip of model GTAH25030C6 produced by Innogration Technologies.

[0107] As Figure 11 shown, in some embodiments, the oscillation circuit of the integrated chip is an integrated voltage-controlled oscillator VCO and attenuator ATT, and the output power can be adjusted. The output power passes through the integrated first-stage power amplifier, the driver-stage power amplifier + the final-stage power amplifier in sequence; or as Figure 12As shown, the output power successively passes through the integrated first-stage power amplifier + driver power amplifier and the final-stage power amplifier. A circulator is a device that transmits RF conduction signals unidirectionally. In the circulator, the conduction direction of the signal is from the first end to the second end and from the second end to the third end.

[0108] Reference Figure 10 、 Figure 11 or Figure 12 As shown, in some possible implementation scenarios, the high-power load is selected to operate in a high-frequency state. The rated power of the high-power load is greater than the maximum reflected power of the microwave antenna 111. As an optional example, the resistance value of the high-power load is 50 ohms or a larger resistance value. The function of the high-power load is to absorb the energy reflected back by the microwave antenna 111.

[0109] In some embodiments, the microstrip includes a forward output microstrip and a reflection microstrip. The two ends of the forward output microstrip are respectively connected to the output end of the integrated chip and the PI-type attenuator. The two ends of the reflection microstrip are respectively connected to the load and the power detector. The forward output microstrip and the reflection microstrip are coupled with a certain coupling degree. The microstrip couples the power of the forward output end and the reflection end. The sampling pin MCU_AD1 of the controller collects the voltage value V at the output end through the PI-type attenuator 耦合 , and the sampling pin MCU_AD2 collects the voltage value V at the reflection end through the power detector 反射 . Thus, the magnitudes of the power at the forward output end and the reflection end can be mapped and calculated. Further, the return loss of the microwave antenna 111 can be calculated through the proportional relationship between the power at the forward output end and the power at the reflection end.

[0110] In some other embodiments, the microstrip includes a reflection microstrip. The two ends of the reflection microstrip are respectively connected to the load and the power detector. The power value of the reflected microwave signal can also be mapped through the power detector. The controller can actually map the return loss value through the mapping relationship between the changing power value and the return loss.

[0111] In still some other embodiments, the forward output microstrip and the reflection microstrip can be omitted, and the stability of the integrated chip is judged by the stable current floating change of the integrated chip during operation. An increase in current indicates that the reflected signal of the microwave antenna increases, resulting in a decrease in return loss. When the current decreases, it indicates an increase in the value of the return loss and an improvement in the efficiency of microwave heating.

[0112] In some embodiments, the integrated chip operates within a frequency range of 2430 MHz - 2460 MHz. According to the return loss RL = 20log(VSWR + 1 / VSWR - 1) = 20log(P 输出 / P 反射 ) = 20log(V 耦合 / V 反射)Calculate the return loss of the aerosol generating article 900 at each frequency, where P 输出 and P 反射 correspond to the RF power at the forward output end and the reflected power at the reflection end, V 耦合 and V 反射 correspond to the voltage value at the forward output end and the voltage value at the reflection end. For example, as an example, the integrated chip outputs RF energy with a reference frequency of 2449 MHz and a power of Pout, which is input through the first end of the circulator, conducted through the second end and output to the microwave antenna 111, and the microwave energy reflected back by the microwave antenna 111 is received through the third end and transferred to the load. During the operation of the aerosol generating device 400, part of the heat of the heating component 110 is transferred to the microwave generating circuit. As the temperature rises or falls, the output frequency of the integrated chip will increase or decrease, not exceeding 2460 MHz at most and not less than 2430 MHz at least. Therefore, the optimal return loss of the microwave antenna 111 must cover these frequency ranges.

[0113] For example, as some test examples, when the return loss is greater than or equal to 10, the power transfer efficiency of the microwave antenna 111 is greater than 90%; when the return loss is greater than or equal to 13.7, the power transfer efficiency of the microwave antenna 111 is greater than 95.7%; when the return loss is greater than or equal to 18.2, the power transfer efficiency of the microwave antenna 111 is greater than 98.5%.

[0114] From the above tests, it can be seen that in this embodiment, as a suitable exemplary frequency selection, the heating frequency of the microwave antenna 111 is 2430 MHZ - 2460 MHZ. In this frequency band, the return loss of the microwave antenna 111 is greater than or equal to 10, and the transmission efficiency of the microwave antenna 111 is greater than 90%, and the heating effect on the aerosol generating article 900 is better.

[0115] In the existing integrated chip, there is no circulator at the output end, and it is directly connected to the microwave antenna 111. When the return loss of the microwave antenna 111 deteriorates, the microwave will be reflected back to the output end of the integrated chip, resulting in self-excitation and damage to the integrated chip. Therefore, in this embodiment, by adding a circulator at the output end of the integrated chip, the microwave reflected by the microwave antenna 111 is absorbed by the load, thus protecting the integrated chip.

[0116] In some other embodiments of the present application, the integrated chip selects the optimal operating frequency point among the top 5 frequency points with the best transmission efficiency as the frequency point for actual microwave heating. The heating control method is as follows: The controller controls the integrated chip to output a microwave signal with a frequency of f and a power of Pout; the microwave signal is input through the first end of the circulator and conducted and output to the sheet microwave antenna through the second end; the sheet microwave antenna reflects part of the microwave signal to the third end of the circulator; the power of the first end and the third end of the microstrip coupled circulator is coupled, and V 耦合 and V 反射 are given to the controller; the controller calculates the return loss of the output frequency according to the return loss RL = 20log(VSWR + 1 / VSWR - 1) = 20log(P 输出 / P 反射 ) = 20log(V 耦合 / V 反射 ); the controller increases or decreases the output frequency of the integrated chip according to the preset adjustment value, and repeats the above steps until the output frequency of the integrated chip traverses 2430 MHz - 2460 MHz, obtaining the return loss values of multiple output frequencies; the controller selects the output frequencies corresponding to the return loss greater than 10, and records the output frequencies with the return loss greater than 10 and their corresponding transmission efficiencies in an array to form a mapping relationship; the controller selects the top 5 output frequencies with the best transmission efficiency from the array, and selects the best output frequency from the 5 output frequencies as the actual output frequency of the integrated chip. By controlling the aerosol generating device 400 through the above heating control method, the top 5 output frequencies with the best transmission efficiency can be selected, and the best output frequency is selected from them as the actual output frequency of the integrated chip, so that the sheet microwave antenna 111 heats the aerosol generating article 900 at the best output frequency when the transmission efficiency is greater than 90%, improving the heating efficiency. It should be noted that the preset adjustment value can be set through the controller as needed. In this embodiment, the preset adjustment value can be set to 2 MHz.

[0117] It can be understood that during the heating operation of the aerosol generating device 400, the microwave generating circuit can output a microwave signal with a fixed frequency. For example, in some exemplary embodiments, during the long-term use of the device, the optimal frequency point of the microwave antenna may shift. Therefore, a program for screening the optimal output frequency is built into the controller in the microwave generating circuit. When the aerosol generating device 400 is started each time or periodically, the integrated chip calls and runs this program to determine the optimal output frequency through the above method, and then uses this optimal output frequency to feed radio frequency energy through the microwave antenna, thereby controlling the heating component 110 to start working. For another example, in some other exemplary embodiments, the aerosol generating device 400 can only use the above method to determine the optimal output frequency during the commissioning stage before leaving the factory, and use the determined optimal output frequency to heat during the actual use of the aerosol generating device 400.

[0118] In some other exemplary embodiments, during the heating operation of the aerosol generating device 400, the microwave generating circuit can output a microwave signal with a variable frequency. For example, factors such as temperature change may affect the frequency shift of the microwave antenna. Therefore, the controller in the microwave generating circuit is configured to collect the feedback signal parameters of the microwave antenna in real time or periodically and calculate the return loss value, so as to adjust the optimal output frequency output to the microwave antenna according to the change of the return loss value.

[0119] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A heating assembly for heating an aerosol generating article to generate an aerosol, characterized in that: include: a support tube defining a heating chamber for receiving at least a portion of the aerosol-generating article; A microwave antenna is disposed on the inner surface of the support tube, the microwave antenna at least partially surrounds the heating cavity or defines at least a portion of the boundary of the heating cavity, and the microwave antenna is used to emit radio frequency energy into the heating cavity, thereby radiatively heating at least a portion of the aerosol generating product located in the heating cavity.

2. The heating assembly according to claim 1, characterized in that The microwave antenna is formed by winding a planar microwave antenna.

3. The heating assembly according to claim 1 or 2, characterized in that: The support tube includes a first support portion and a second support portion that are connected to each other. The first support portion is located at one end where the aerosol generating product is inserted. The inner diameter of the first support portion is smaller than the inner diameter of the second support portion. A step is formed at the connection between the first support portion and the second support portion, and the microwave antenna abuts against the step.

4. The heating assembly according to claim 1, characterized in that A metal layer is arranged between the support tube and the microwave antenna.

5. The heating assembly according to claim 1, characterized in that The support tube is a ceramic tube, a quartz glass tube or a polyetheretherketone tube.

6. The heating assembly according to claim 1, characterized in that The microwave antenna is a nickel silver sheet.

7. The heating assembly according to claim 2, characterized in that The microwave antenna is in a sheet shape, and the thickness of the microwave antenna is 0.2 mm to 0.7 mm.

8. The heating assembly according to claim 1, characterized in that The microwave antenna has a first through slot and a second through slot extending circumferentially and parallel to each other, and a portion of the support tube is exposed to the first through slot and the second through slot.

9. The heating assembly according to claim 8, characterized in that The width of the first through slot is greater than the width of the second through slot.

10. The heating assembly according to claim 8, characterized in that The microwave antenna is provided with a feeding end for connecting to the output end of radio frequency energy and a grounding end for connecting to the antenna reference ground, and the feeding end and the grounding end are respectively located at two sides of the opening of the first through slot or the second through slot.

11. The heating assembly according to claim 10, characterized in that The supporting tube includes a first through hole and a second through hole, the feeding end is exposed to the first through hole, and the grounding end is exposed to the second through hole.

12. The heating assembly according to claim 2, characterized in that The microwave antenna is in a Z shape or an F shape.

13. The heating assembly according to claim 1, characterized in that The supporting tube further includes a third through hole, and the microwave antenna includes a soldering pad for connecting a temperature sensor, wherein the soldering pad is exposed to the third through hole.

14. The heating assembly according to claim 1, characterized in that The microwave antenna comprises a planar microwave antenna, wherein the planar microwave antenna has a first side and a second side opposite to each other in a circumferential direction, wherein the first side and the second side do not overlap each other to form a gap.

15. The heating assembly according to claim 14, characterized in that The planar microwave antenna is provided with a first through slot extending from the first side toward the second side, and there is a distance between the first through slot and the second side.

16. The heating assembly according to claim 15, characterized in that The planar microwave antenna is further provided with a second through slot extending from the second side toward the first side, the second through slot is spaced apart from the first side, and the second through slot is staggered with the first through slot in the longitudinal direction.

17. The heating assembly according to claim 16, characterized in that The distance between the first through slot and the second side is greater than the distance between the second through slot and the first side.

18. The heating assembly according to claim 14, characterized in that The planar microwave antenna comprises a grounding end and a feeding end, wherein the grounding end and the feeding end are both located on the first side, or the grounding end and the feeding end are both located on the second side.

19. The heating assembly according to claim 1, characterized in that The microwave antenna comprises a planar microwave antenna, the height of the planar microwave antenna along the longitudinal direction of the support tube is 15 mm-19 mm, or the width of the planar microwave antenna after being unfolded along the circumferential direction is 17 mm-23 mm.

20. An aerosol generating device, characterized in that: It comprises a circuit board assembly and the heating assembly according to any one of claims 1 to 19, wherein the circuit board assembly is used to provide electrical energy to the heating assembly.

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