Microwave heating assembly and aerosol-generating device

Abstract

The application relates to a microwave heating assembly and an aerosol generating device, the microwave heating assembly comprising a resonant cavity and a microwave feeding device, the resonant cavity being columnar and formed by a conductive shell, the conductive shell comprising a conductive bottom wall and a conductive side wall, and the resonant cavity having an open end at an end opposite to the conductive bottom wall, a containing cavity for containing an aerosol generating substrate being arranged in the resonant cavity close to the open end, and a filling base being filled between the containing cavity and the conductive shell; a feeding hole is formed in the conductive shell, and the microwave feeding device feeds microwaves into the resonant cavity through the feeding hole; in the same temperature environment, the relative dielectric constant of the filling base is greater than the relative dielectric constant of the aerosol generating substrate, and the tangent value of the loss angle of the filling base is less than the tangent value of the loss angle of the aerosol generating substrate. Since the filling base is formed by a high-dielectric-constant and low-loss material, the coupling between the resonant cavity and the radio frequency source during the heating process is always maintained at a high level.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of atomization technology, in particular to a microwave heating assembly and an aerosol generating device. BACKGROUND

[0002] An aerosol is a colloidal dispersion system formed by solid or liquid small particles dispersed and suspended in a gaseous medium. Since the aerosol can be absorbed by the human body through the respiratory system, it provides a new type of alternative absorption method for users. An aerosol generating device is a device that forms an aerosol by heating or ultrasonic means. The aerosol generating medium includes liquid, gel, paste or solid aerosol generating substrate. Atomizing these media can deliver aerosols for inhalation to users, replacing conventional product forms and absorption methods.

[0003] However, the current aerosol generating device mainly uses heat conduction to heat the aerosol generating substrate, which has the defects of long preheating time and uneven heating. As a new type of heating technology, microwave heating heats the aerosol generating substrate by microwave radiation, has the advantages of fast heating speed and good uniformity, and is gradually applied to aerosol generating devices. The aerosol generating device using microwave radiation heating usually uses a cavity made of copper, aluminum or other high-conductivity metals as a radio frequency heating resonant cavity, but the resonant frequency of the resonant cavity will change constantly due to the influence of the state of the heated object, resulting in fluctuations in the coupling coefficient between the radio frequency source and the resonant cavity, and thus the energy entering the resonant cavity changes, affecting the consistency of the atomization effect and the energy utilization efficiency. SUMMARY

[0004] Therefore, it is necessary to provide a microwave heating assembly and an aerosol generating device to solve the problem that the resonant frequency of the resonant cavity changes greatly with the state of the heated object.

[0005] According to one aspect of the present application, a microwave heating assembly is provided, which comprises a resonant cavity and a microwave feeding device. The resonant cavity is columnar and is formed by a conductive shell. The conductive shell comprises a conductive bottom wall and a conductive side wall extending from the edge of the conductive bottom wall in the same direction. The resonant cavity has an open end at the end opposite to the conductive bottom wall. A containing cavity for containing an aerosol generating substrate is arranged near the open end in the resonant cavity. A filling base is filled between the containing cavity and the conductive shell.

[0006] A feeding hole is formed on the conductive shell. The microwave feeding device feeds microwaves into the resonant cavity through the feeding hole.

[0007] The relative dielectric constant of the filling matrix is greater than the relative dielectric constant of the aerosol generating substrate, and the tangent value of the loss angle of the filling matrix is less than the tangent value of the loss angle of the aerosol generating substrate under the same temperature environment.

[0008] In one of the embodiments, an inner conductor coaxially arranged in the resonant cavity with the conductive shell is further included, and the inner conductor is arranged on the conductive bottom wall and electrically connected thereto.

[0009] In one of the embodiments, the opening of the open end is coaxially arranged with the inner conductor, and a top end of the inner conductor and the open end form the accommodation cavity, and at least a part of the cavity section near the top end of the inner conductor forms a heating zone for heating the aerosol generating substrate.

[0010] In one of the embodiments, the microwave heating assembly further includes a conductive needle, one end of the conductive needle is arranged at the top end of the inner conductor and electrically connected thereto, and the other end of the conductive needle extends into the accommodation cavity.

[0011] In one of the embodiments, the inner conductor has a hollow tubular structure with two open ends, the hollow tubular structure is coaxially arranged with the opening of the open end, a first axial end of the inner conductor is connected with the conductive bottom wall, and a second axial end of the inner conductor extends to the open end and forms the accommodation cavity, a communication groove in communication with the resonant cavity is formed on the side wall of the inner conductor at least in part of the cavity section of the accommodation cavity, and the communication groove forms a heating zone for heating the aerosol generating substrate.

[0012] In one of the embodiments, the heating zone is arranged along the circumference of the accommodation cavity.

[0013] In one of the embodiments, the microwave heating assembly further includes a top rod, the top rod axially extends into the first axial end of the inner conductor to form a cavity bottom wall of the accommodation cavity, and the top rod is controllably reciprocally movable in the inner conductor.

[0014] In one of the embodiments, the microwave feeding device includes an interface and a conductive piece, the conductive piece is arranged in the resonant cavity, the interface is arranged at the feeding hole, one end of the conductive piece is connected with the interface, and the other end of the conductive piece is electrically connected with the conductive side wall.

[0015] In one of the embodiments, the relative dielectric constant of the filling matrix is greater than 3 at room temperature.

[0016] In one of the embodiments, the relative dielectric constant of the filling matrix ranges from greater than 8 to less than 50 at room temperature.

[0017] In one of the embodiments, the tangent loss value of the filling matrix is less than 50% of the tangent loss value of the aerosol generating substrate at room temperature.

[0018] In one of the embodiments, the tangent loss value of the filling matrix is less than 0.001.

[0019] In one of the embodiments, the material of the filling matrix is at least one of ceramic, plastic or glass with a relative dielectric constant greater than 3 and a tangent loss value less than 0.1.

[0020] In one of the embodiments, the relative dielectric constant of the ceramic, plastic or glass is between 8-50, and the tangent loss value is less than 0.001.

[0021] In one of the embodiments, there is a gap between the accommodating cavity and the aerosol generating substrate.

[0022] In one of the embodiments, the filling matrix comprises a first matrix and a second matrix arranged at intervals.

[0023] In one of the embodiments, the first matrix is arranged adjacent to the accommodating cavity, the second matrix is arranged away from the accommodating cavity, and the thickness dimension of the first matrix along the radial direction of the accommodating cavity is less than the thickness dimension of the second matrix along the radial direction of the accommodating cavity.

[0024] According to one aspect of the present application, an aerosol generating device is provided, comprising the microwave heating assembly of the above-mentioned embodiments.

[0025] The microwave heating assembly described above, since the filling matrix with high dielectric constant and low loss is filled in the resonant cavity, the resonant frequency in the resonant cavity formed by the conductive shell does not change substantially with the change of the aerosol generating substrate during the heating process, thereby maintaining the coupling between the resonant cavity and the radio frequency source at a high level during the heating process, and the heating process is more stable, and the generated aerosol has good taste and consistency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is an equivalent circuit diagram of a metal resonant cavity;

[0027] Figure 2 is a schematic diagram of the appearance of the microwave heating assembly of one embodiment of the present application;

[0028] Figure 3 is a schematic diagram of the internal structure of the microwave heating assembly of the first embodiment of the present application;

[0029] Figure 4 is a schematic diagram of the internal structure of the microwave heating assembly of the second embodiment of the present application;

[0030] Figure 5 FIG. 3 is a schematic view of an internal structure of a microwave heating assembly according to a third embodiment of the present application;

[0031] Figure 6 FIG. 4 is a schematic view of an internal structure of a microwave heating assembly according to a fourth embodiment of the present application; Figure 5 FIG. 5 is a schematic view of an internal structure of a microwave heating assembly according to a fifth embodiment of the present application.

[0032] BEST MODE FOR CARRYING OUT THE INVENTION

[0033] 100, microwave heating assembly; 110, conductive shell; 110a, open end; 110b, accommodating cavity; 112, conductive bottom wall; 1121, connecting column; 114, conductive side wall; 1141, first conductive section; 1143, second conductive section; 120, filling base; 130, inner conductive body; 130a, communicating groove; 140, conductive needle; 150, top rod; 160, interface; 170, conductive member; 171, first conductive part; 173, second conductive part;

[0034] 200, aerosol generating substrate. DETAILED DESCRIPTION

[0035] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0038] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", and "fixedly" are used broadly and encompass direct and indirect connections, as well as fixed or detachable connections. Such terms are not limited to the mechanical connections, but also include electrical connections, which are deemed equivalent by those skilled in the art. It should be noted that, in the present application, the terms "on", "under", "above", and "under" are not limited to the direct contact between elements, but also include indirect contact between elements through an intermediate medium. In addition, the terms "on", "above", and "above" of a first feature relative to a second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" of the second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower than the second feature in horizontal height.

[0039] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", and "fixedly" are used broadly and encompass direct and indirect connections, as well as fixed or detachable connections. Such terms are not limited to the mechanical connections, but also include electrical connections, which are deemed equivalent by those skilled in the art. It should be noted that, in the present application, the terms "on", "under", "above", and "under" are not limited to the direct contact between elements, but also include indirect contact between elements through an intermediate medium. In addition, the terms "on", "above", and "above" of a first feature relative to a second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" of the second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower than the second feature in horizontal height.

[0040] It should be noted that when an element is referred to as "fixed to" or "attached to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms are used only to illustrate the purpose, and are not the only embodiment.

[0041] The aerosol generating device provided by the embodiment of the present application comprises a power supply assembly and a microwave heating assembly. The microwave heating assembly is connected to one end of the power supply assembly and is electrically connected to the power supply assembly. The microwave heating assembly can heat the aerosol generating substrate under the action of the power supply assembly to generate aerosol for the user. The aerosol generating substrate is in the form of a solid, including but not limited to plant materials for medical, health, health, beauty purposes, such as roots, stems, leaves, flowers, buds, seeds, etc. In the following embodiments, the aerosol generating substrate is in a cylindrical structure which can be inserted into the aerosol generating device.

[0042] Microwave heating is a heating technology that heats and warms an aerosol generating substrate by microwave radiation to generate aerosol through its own dielectric loss. The inventors found in the research process that the existing aerosol generating device using microwave heating technology usually uses a cavity made of high-conductivity metals such as copper and aluminum as a resonant cavity for radio frequency heating. This has the disadvantages of high cost and large size. Moreover, as described in the background art, the resonant frequency of the resonant cavity is greatly affected by the state of the heated object (such as the composition, temperature, water content, etc. of the heated object), which causes the coupling coefficient between the resonant cavity and the radio frequency source of a certain frequency (including but not limited to 915MH, 2450MHz, 5800MHz, 26125MHz) to fluctuate. The consequence is that the energy entering the resonant cavity changes uncontrollably, which seriously affects the taste and energy utilization efficiency.

[0043] As shown in Figure 1 , specifically, the resonant cavity can be equivalent to a series resonant circuit of resistance R1, inductance C1 and capacitance L1, and its resonant frequency is determined by the product of the equivalent capacitance C1 and the equivalent inductance L1. When the resonant cavity is a hollow cavity, Figure 1 , the equivalent capacitance C1 is equivalent to filling air, and the relative dielectric constant of air is always 1, so its capacitance value is constant.

[0044] When the aerosol generating substrate is added to the hollow cavity, it is equivalent to filling part of the space in the equivalent capacitance C1 with the aerosol generating substrate, and the relative dielectric constant of the aerosol generating substrate changes with temperature, causing the equivalent capacitance C1 to change. During the puffing process, the temperature of the aerosol generating substrate rises rapidly from room temperature to about 300℃ in a few seconds, and the mass of the aerosol generating substrate decreases by about 40% after the volatile components are atomized, and fiber carbonization occurs. During the entire process, the dielectric constant of the aerosol generating substrate changes dramatically, causing the resonant cavity frequency to shift significantly (for a metal cavity, the frequency deviation from the center frequency can be more than 140MHZ), resulting in the coupling efficiency of the radio frequency source and the resonant cavity cannot always be maintained at a high level, causing the amount of aerosol generated at different times to be different and the taste to be inconsistent.

[0045] To solve the above problems, please refer to Figure 2 and Figure 3The microwave heating assembly 100 of the present application comprises a resonant cavity and a microwave feeding device. The resonant cavity is in a columnar shape and is formed by a conductive shell 110. The conductive shell 110 comprises a conductive bottom wall 112 and a conductive side wall 114 extending from the edge of the conductive bottom wall 112 in the same direction. The resonant cavity has an open end 110a at the end opposite to the conductive bottom wall 112. A receiving cavity 110b for accommodating the aerosol generating substrate 200 is arranged in the resonant cavity near the open end 110a. The receiving cavity 110b and the conductive shell 110 are filled with a filling base 120. The microwave feeding device feeds microwaves into the resonant cavity through a feeding hole in the conductive shell 110. The microwaves in the resonant cavity can heat the aerosol generating substrate in the receiving cavity 110b through the filling base 120.

[0046] In the same temperature environment, the relative dielectric constant of the filling base 120 is greater than that of the aerosol generating substrate 200, and the tangent value of the loss angle of the filling base 120 is less than that of the aerosol generating substrate 200. The relative dielectric constant is a physical parameter representing the dielectric or polarization properties of a dielectric material. Its value is approximately equal to the ratio of the capacitance of a capacitor with the same size made of a predicted material as the dielectric to that made of vacuum as the dielectric. This value also represents the ability of the material to store electric charge. The tangent value of the loss angle of the capacitor refers to the ratio of the active power P to the reactive power Q of an ideal capacitor. The smaller the tangent value of the loss angle, the better the performance of the capacitor.

[0047] The microwave heating assembly 100 is equivalent to a capacitor. The electric field energy of the capacitor can be stored in the filling base 120 and the aerosol generating substrate 200, and the amount of stored energy is proportional to the dielectric constant and volume of the filling base 120 and the aerosol generating substrate 200. Since the relative dielectric constant of the filling base 120 is greater than that of the aerosol generating substrate 200, and the volume and mass of the filling base 120 are also much greater than those of the aerosol generating substrate 200, the electric field energy stored in the filling base 120 is greater than that stored in the aerosol generating substrate 200. Therefore, the capacitance value of the capacitor is mainly determined by the filling base 120, and the change in the dielectric constant of the aerosol generating substrate 200 during the heating process has little effect on the capacitance value. As a result, the resonant frequency in the resonant cavity does not change significantly during the heating process of the aerosol generating substrate 200, and the coupling between the resonant cavity and the radio frequency source during the heating process is always maintained at a high level, which can achieve higher heating efficiency and more stable heating process. In addition, the above-mentioned microwave heating assembly 100 does not need to be set to a large volume to meet the requirement of the resonant frequency.

[0048] At room temperature, the relative dielectric constant of the filling matrix 120 is greater than 3 because the relative dielectric constant of the aerosol generating substrate 200 is less than 2. In a preferred embodiment, the relative dielectric constant of the filling matrix 120 at room temperature ranges from greater than 8 to less than 50. In this way, the contradiction between the aerosol generation speed and the frequency stabilization effect can be balanced. Specifically, the greater the relative dielectric constant of the filling matrix 120, the better the frequency stabilization effect, but the slower the aerosol generation speed; the smaller the relative dielectric constant of the filling matrix 120, the faster the aerosol generation speed, but the worse the frequency stabilization effect, and thus the performance requirements of the microwave feeding device are higher, which increases the production cost. Therefore, the relative dielectric constant of the filling matrix 120 at room temperature ranges from greater than 8 to less than 50, which can achieve good frequency stabilization effect and high aerosol generation speed, and effectively control the production cost.

[0049] On the contrary, for the same frequency of the microwave feeding device, the greater the relative dielectric constant of the filling matrix 120, the smaller the volume of the resonant cavity, and thus when the relative dielectric constant of the filling matrix 120 is less than 8, the resonant cavity needs to be set to a larger volume, which is not conducive to the miniaturization development of the aerosol generating device. When the relative dielectric constant of the filling matrix 120 is greater than 50, the volume of the resonant cavity is too small, which leads to a significant reduction in the size of the atomization substrate, which seriously affects the aerosol generation amount and taste.

[0050] Further, at room temperature, the loss tangent of the filling matrix 120 is less than 50% of the loss tangent of the aerosol generating substrate 200, and in a preferred embodiment, the loss tangent of the filling matrix 120 is less than 0.001, which can significantly improve the quality factor of the resonant cavity.

[0051] Specifically, in some embodiments, the material forming the filling matrix 120 includes at least one of ceramic, plastic or glass, the relative dielectric constant of which is greater than 3 and the loss tangent of which is less than 0.1, and preferably, the relative dielectric constant of the ceramic, plastic or glass ranges from 8 to 50. The conductive shell 110 is formed of a metal material and can be formed on the surface of the filling matrix 120 by sintering, electroplating, particle sputtering or the like, or formed by machining with an extended metal. The thickness of the conductive shell 110 is thin, which reduces the production cost compared with the existing metal resonant cavity.

[0052] In some embodiments, at least part of the inner diameter of the accommodating cavity 110b is greater than the inner diameter of the aerosol generating substrate 200, so that there is a gap between the cavity wall of the accommodating cavity 110b and the aerosol generating substrate 200. In other embodiments, the inner diameter of the accommodating cavity 110b matches the inner diameter of the aerosol generating substrate 200, so that the cavity wall of the accommodating cavity 110b closely fits the outer surface of the aerosol generating substrate 200.

[0053] Please continue to refer to Figure 2 and Figure 3 , the conductive shell 110 is generally hollow in the form of a solid of revolution, the conductive side wall 114 has a first conductive section 1141 and a second conductive section 1143 arranged in sequence in the axial direction, and the outer diameter of the second conductive section 1143 is smaller than the outer diameter of the first conductive section 1141. The first conductive section 1141 and the second conductive section 1143 form a stepped surface extending in the circumferential direction. The conductive bottom wall 112 of the conductive shell 110 is located at one end of the first conductive section 1141 away from the second conductive section 1143. The open end 110a of the resonant cavity is formed at one end of the second conductive section 1143 away from the first conductive section 1141.

[0054] Further, the microwave heating assembly 100 further comprises an inner conductive body 130, which is coaxially arranged in the resonant cavity with the conductive shell 110. The inner conductive body 130 is arranged on the conductive bottom wall 112 and electrically connected thereto. In this way, the inner conductive body 130 and the conductive shell 110 jointly define a coaxial resonant cavity. The coaxial resonant cavity has the advantages of small volume and large power, thereby reducing the overall volume of the aerosol generating device and improving the portability of the aerosol generating device.

[0055] As shown in Figure 3 , in the first embodiment of the present application, the inner conductive body 130 is in the form of a hollow column that communicates with the conductive bottom wall 112 and is coaxially arranged with the opening of the open end 110a of the resonant cavity. The axial length of the inner conductive body 130 is smaller than the axial length of the outer conductive portion. The top end of the inner conductive body 130 and the open end 110a form a receiving cavity 110b. The receiving cavity 110b has a cavity bottom wall spaced apart from the inner conductive body 130 and a cavity side wall surrounding the cavity bottom wall in the circumferential direction. The central axis of the receiving cavity 110b coincides with the central axis of the inner conductive body 130. At least part of the cavity section of the receiving cavity 110b near the top end of the inner conductive body 130 is the place with the strongest electric field intensity, thereby forming a heating zone for heating the aerosol generating substrate 200.

[0056] As shown in Figure 4 , in the second embodiment of the present application, similar to the first embodiment, the inner conductive body 130 is in the form of a hollow column that communicates with the conductive bottom wall 112 and is coaxially arranged with the opening of the open end 110a of the resonant cavity. The axial length of the inner conductive body 130 is smaller than the axial length of the conductive shell 110. The top end of the inner conductive body 130 and the open end 110a form a receiving cavity 110b. The receiving cavity 110b has a cavity bottom wall spaced apart from the inner conductive body 130 and a cavity side wall surrounding the cavity bottom wall in the circumferential direction. The central axis of the receiving cavity 110b coincides with the central axis of the inner conductive body 130. At least part of the cavity section of the receiving cavity 110b near the top end of the inner conductive body 130 is the place with the strongest electric field intensity, thereby forming a heating zone for heating the aerosol generating substrate 200.

[0057] The difference from the first embodiment is that the microwave heating assembly 100 of the second embodiment further comprises a conductive needle 140 having a pointed end, the conductive needle 140 is formed of a metal material, one end of the conductive needle 140 is arranged at the top end of the inner conductor 130 and is electrically connected thereto, the other end of the conductive needle 140 having the pointed end extends into the accommodating cavity 110b through the filling base 120 in the first direction, and the central axis of the conductive needle 140 coincides with the central axis of the accommodating cavity 110b.

[0058] In this way, the conductive needle 140 is inserted into the aerosol generating substrate 200 from the bottom of the aerosol generating substrate 200, and the heating zone and the conductive needle 140 can simultaneously heat one end of the aerosol generating substrate 200 close to the cavity bottom wall of the accommodating cavity 110b. Compared with the first embodiment, the conductive needle 140 in the second embodiment can radiate electromagnetic energy to the heating zone, so that the inside of the aerosol generating substrate 200 is heated faster, and the atomization effect is improved.

[0059] As shown in FIGS. 1, 2 and 3, the inner conductor 130 is arranged in the accommodating cavity 110b and is in contact with the conductive bottom wall 112. The inner conductor 130 is arranged in the accommodating cavity 110b and is in contact with the conductive bottom wall 112. Figure 5 In addition, as shown in FIGS. 1, 2 and 3, the inner conductor 130 is arranged in the accommodating cavity 110b and is in contact with the conductive bottom wall 112. The inner conductor 130 is arranged in the accommodating cavity 110b and is in contact with the conductive bottom wall 112. Figure 6 As shown in FIGS. 1, 2 and 3, the inner conductor 130 is arranged in the accommodating cavity 110b and is in contact with the conductive bottom wall 112. The inner conductor 130 is arranged in the accommodating cavity 110b and is in contact with the conductive bottom wall 112.

[0060] Further, the side wall of the inner conductor 130 at least partially in the cavity section of the accommodating cavity 110b is provided with a communication groove 130a in communication with the resonant cavity, and the filling base 120 is exposed to the communication groove 130a. The microwaves in the resonant cavity can pass through the communication groove 130a into the accommodating cavity 110b, thereby forming a heating zone for heating the aerosol generating substrate 200. In this way, the part of the aerosol generating substrate 200 corresponding to the heating zone is heated and atomized under the action of microwaves. In some embodiments, the communication grooves 130a are arranged along the circumference of the accommodating cavity 110b, and the filling base 120 exposed to the communication grooves 130a forms a circular annular heating zone arranged along the circumference of the accommodating cavity 110b. Preferably, the communication grooves 130a are arranged at the position where the electric field intensity of the resonant cavity is the strongest, thereby facilitating the coupling of microwave energy. However, on the side of the communication groove 130a away from the conductive bottom wall 112, the electromagnetic wave is cut off by the side wall of the inner conductor 130, and the energy is attenuated by a geometric factor therein.

[0061] Further, the microwave heating assembly 100 further comprises a top rod 150, one axial end of the top rod 150 extends into the first axial end of the inner conductor 130 to form a cavity bottom wall of the accommodating cavity 110b, and the other axial end of the top rod 150 is connected to an external driving mechanism, under the driving of the driving mechanism, the top rod 150 can be controlled to reciprocate in the inner conductor 130.

[0062] In this way, the top rod 150 can push the aerosol generating substrate 200 to move step by step forward in the accommodating cavity 110b, and different parts of the aerosol generating substrate 200 in the axial direction are sequentially corresponding to the heating zone, so as to be heated and atomized in the heating zone in sections from top to bottom. It can be understood that the specific structure of the driving mechanism driving the movement of the top rod 150 is not limited, and can be composed of a stepping motor or the like driving member as needed.

[0063] In the above embodiment, the microwave heating assembly 100 further comprises an interface 160 and a conductive member 170, the conductive member 170 is arranged in the resonant cavity, and the interface 160 is arranged at the feed-in hole and electrically connected with the microwave feed-in device. One end of the conductive member 170 is connected with the interface 160, and the other end of the conductive member 170 is electrically connected with the conductive side wall 114. In this way, the conductive member 170 and the conductive shell 110 together form a magnetic loop antenna, and the microwave generated by the microwave feed-in device is fed into the resonant cavity formed by the conductive shell 110 through the magnetic loop antenna to form radio frequency energy.

[0064] Specifically, the conductive member 170 is formed of a metal wire or other metal material, and comprises a first conductive part 171 and a second conductive part 173 connected with each other. One end of the first conductive part 171 is connected with the interface 160, and the other end extends into the filling base 120 in the first direction, one end of the second conductive part 173 is connected with the first conductive part 171, and the other end of the second conductive part 173 extends to the conductive side wall 114 in the radial direction of the conductive shell 110 to be electrically connected with the conductive shell 110. In this way, the conductive member 170, the conductive side wall 114, the conductive bottom wall 112 and the interface 160 together form a loop connected with the microwave feed-in device. Since the first conductive part 171 and the second conductive part 173 are perpendicular to each other, a larger area can be enclosed to improve the power. It can be understood that the shape of the conductive member 170 is not limited to this, and can be set as needed to meet different requirements.

[0065] In addition, the filling base 120 comprises a first base and a second base arranged at intervals, and in one embodiment, the first base is arranged adjacent to the accommodating cavity 110b, the second base is arranged away from the accommodating cavity 110b, and the thickness dimension of the first base along the radial direction of the accommodating cavity 110b is smaller than the thickness dimension of the second base along the radial direction of the accommodating cavity 110b, which is conducive to the heat dissipation of the aerosol forming substrate and further improves the energy utilization rate.

[0066] The microwave heating assembly 100 and the aerosol generating device provided with the same have the following advantages. The microwave heating assembly 100 is formed by the conductive shell 110 and the filling base 120 filled in the conductive shell 110, and the filling base 120 is formed by a material with high dielectric constant and low loss. Therefore, during the heating process of the aerosol generating substrate 200, the resonant frequency in the resonant cavity formed by the conductive shell 110 does not change substantially with the change of the aerosol generating substrate 200, and the coupling between the resonant cavity and the radio frequency source during the heating process is always maintained at a high level, the heating process is more stable, and the aerosol generated by atomizing the aerosol generating substrate 200 is more easily adjusted to have a good taste and high consistency. Moreover, compared with a traditional all-metal resonant cavity, the microwave heating assembly 100 has a smaller size, which meets the miniaturization requirement of the aerosol generating device.

[0067] Any combination of the technical features of the above-described embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present disclosure.

[0068] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A microwave heating assembly, characterized by, The microwave heating assembly comprises a resonant cavity and a microwave feeding device, the resonant cavity is in a columnar shape and is formed by a conductive shell, the conductive shell comprises a conductive bottom wall and a conductive side wall extending from the edge of the conductive bottom wall in the same direction, and the resonant cavity has an open end at the end opposite to the conductive bottom wall, a containing cavity for containing an aerosol generating substrate is arranged in the resonant cavity close to the open end, and a filling base is filled between the containing cavity and the conductive shell; a feeding hole is formed in the conductive shell, and the microwave feeding device feeds microwaves into the resonant cavity through the feeding hole. In the same temperature environment, the relative dielectric constant of the filling base is greater than the relative dielectric constant of the aerosol generating substrate, and the tangent value of the loss angle of the filling base is less than the tangent value of the loss angle of the aerosol generating substrate, and the volume and mass of the filling base are greater than the volume and mass of the aerosol generating substrate.

2. The microwave heating assembly of claim 1, wherein, Further comprising an inner conductive body coaxially arranged in the resonant cavity with the conductive shell, the inner conductive body is arranged on the conductive bottom wall and electrically connected thereto.

3. The microwave heating assembly of claim 2, wherein, The opening of the open end is coaxially arranged with the inner conductive body, and the containing cavity is formed between the top end of the inner conductive body and the open end, at least part of the cavity section close to the top end of the inner conductive body forms a heating zone for heating the aerosol generating substrate.

4. The microwave heating assembly of claim 3, wherein, The microwave heating assembly further comprises a conductive needle, one end of the conductive needle is arranged at the top end of the inner conductive body and electrically connected thereto, and the other end of the conductive needle extends into the containing cavity.

5. The microwave heating assembly of claim 2, wherein, The inner conductive body is in a hollow tubular structure with both ends open, the hollow tubular structure is coaxially arranged with the opening of the open end, the first axial end of the inner conductive body is connected with the conductive bottom wall, and the second axial end of the inner conductive body extends to the open end and forms the containing cavity, a communication groove in communication with the resonant cavity is formed on the side wall of the inner conductive body in at least part of the cavity section, and the communication groove forms a heating zone for heating the aerosol generating substrate.

6. The microwave heating assembly of claim 5, wherein, The heating zone is arranged along the circumference of the containing cavity.

7. The microwave heating assembly of claim 5, wherein, The microwave heating assembly further comprises a top rod, the top rod extends axially into the first axial end of the inner conductive body to form a cavity bottom wall of the containing cavity, and the top rod can be controlled to reciprocate in the inner conductive body.

8. The microwave heating assembly of claim 1, wherein, The microwave feeding device comprises an interface and a conductive part, the conductive part is arranged in the resonant cavity, the interface is arranged at the feeding hole, one end of the conductive part is connected with the interface, and the other end of the conductive part is electrically connected with the conductive side wall.

9. The microwave heating assembly of any of claims 1-8, wherein, At room temperature, the relative dielectric constant of the filling base is greater than 3.

10. The microwave heating assembly of claim 9, wherein, At room temperature, the relative dielectric constant of the filling base ranges from greater than 8 to less than 50.

11. The microwave heating assembly of any one of claims 1-8, wherein, At room temperature, the tangent value of the loss angle of the filling base is less than 50% of the tangent value of the loss angle of the aerosol generating substrate.

12. The microwave heating assembly of any one of claims 1-8, wherein, The tangent value of the loss angle of the filling base is less than 0.

001.

13. The microwave heating assembly of any one of claims 1-8, wherein, The material of the filling base is at least one of ceramic, plastic or glass, with a relative dielectric constant greater than 3 and a tangent value of the loss angle less than 0.

1.

14. The microwave heating assembly of claim 13, wherein, The ceramic, plastic or glass has a relative dielectric constant of 8-50 and a loss tangent of less than 0.

001.

15. The microwave heating assembly of claim 1, wherein, A gap exists between the accommodation cavity and the aerosol generating substrate.

16. The microwave heating assembly of claim 1, wherein, The filling base body comprises a first base body and a second base body arranged at intervals.

17. The microwave heating assembly of claim 16, wherein, The first base body is arranged adjacent to the accommodation cavity, the second base body is arranged away from the accommodation cavity, and the thickness dimension of the first base body along the radial direction of the accommodation cavity is smaller than the thickness dimension of the second base body along the radial direction of the accommodation cavity.

18. An aerosol-generating device comprising: A microwave heating assembly as claimed in any one of claims 1 to 17.

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