Microwave heating assembly and aerosol generating device

Abstract

The invention discloses a microwave heating assembly and an aerosol generating device. The microwave heating assembly comprises an outer conductor unit and an inner conductor unit arranged in the outer conductor unit. The outer conductor unit defines a cavity; the cavity comprises a first cavity body used for containing an aerosol generating substrate and a second cavity body communicated with the first cavity body of the cavity. The inner conductor unit comprises a probe section and an impedance matching section which are axially connected, the probe section of the inner conductor unit is arranged in the first cavity of the cavity, and the impedance matching section of the inner conductor unit is arranged in the second cavity of the cavity. The aerosol generating substrate is directly arranged in the first cavity of the outer conductor unit, equivalently, the cross section area of the outer conductor unit is reduced at the position of the second cavity, the function of supporting the aerosol generating substrate by the inner conductor unit is canceled, the size of the outer conductor unit is reduced, and the size of the outer conductor unit is reduced. Therefore, miniaturization of the aerosol generating device is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic atomization equipment, and in particular to a microwave heating component and an aerosol generating device. Background Art

[0002] The heating temperature of the heat-not-burn technology is generally between 50 and 350°C. Compared with ordinary burning cigarettes, heat-not-burn cigarettes can significantly reduce the release of harmful substances in tobacco while retaining the taste of traditional cigarettes. One of the heating forms is microwave heating, which has the advantages of high heating efficiency and fast aerosol generation. The existing microwave heating aerosol generating device usually includes an outer conductor unit and an inner conductor unit arranged in the outer conductor unit. The outer conductor unit is a straight cylinder with one end open and the other end closed; the bottom of the aerosol generating matrix is ​​supported on the inner conductor unit. The defect of the prior art is that, in order to support the aerosol generating matrix, the inner conductor unit needs to have a certain width; due to the need for impedance matching, the inner conductor unit itself needs to have a sufficient length, so that the inner conductor unit occupies too much space inside the outer conductor unit, resulting in the outer conductor unit needing to have a larger volume to accommodate the conductor disk, which is not conducive to the miniaturization of the aerosol generating device. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an improved microwave heating component and an aerosol generating device, so as to facilitate the miniaturization of the aerosol generating device.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to provide a microwave heating component, including an outer conductor unit and an inner conductor unit arranged in the outer conductor unit, the outer conductor unit is cylindrical, the cylindrical outer conductor unit defines a cavity, the cavity includes a first cavity for accommodating an aerosol generating matrix, and a second cavity connected to the first cavity of the cavity; the cross-sectional area of ​​the first cavity of the cavity is greater than the cross-sectional area of ​​the second cavity of the cavity; the inner conductor unit includes a probe section and an impedance matching section axially connected, the probe section of the inner conductor unit is arranged in the first cavity of the cavity, and the impedance matching section of the inner conductor unit is arranged in the second cavity of the cavity.

[0005] Preferably, the central axis of the first cavity of the cavity and the central axis of the second cavity of the cavity do not overlap.

[0006] Preferably, the outer conductor unit includes a first side wall and a second side wall axially connected to each other; the first side wall defines a first cavity of the cavity; the second side wall defines a second cavity of the cavity; a microwave feeding hole is formed on the second side wall, and the microwave feeding hole is connected to the second cavity of the cavity.

[0007] Preferably, the outer conductor unit further includes a first bottom wall connected between the first side wall and the second side wall, and a storage area is defined between the first bottom wall and the second side wall; and the microwave feeding hole is located in the storage area.

[0008] Preferably, the microwave heating assembly further comprises a fixing seat for mounting an aerosol generating substrate; the fixing seat is disposed in the cavity.

[0009] Preferably, the fixing seat comprises a first chamber for accommodating the aerosol generating substrate and a second chamber for accommodating the inner conductor unit, and the first chamber of the fixing seat is arranged on one side of the second chamber thereof.

[0010] Preferably, at least two clamping parts spaced apart along the circumferential direction are formed on the inner side wall of the first chamber of the fixing seat; a first air channel is defined between two adjacent clamping parts;

[0011] And / or, at least two bosses are arranged on the inner bottom wall of the first chamber of the fixing seat, and a second air passage is formed between two adjacent bosses.

[0012] Preferably, the inner conductor unit is arranged offset from the central axis of the first cavity.

[0013] Preferably, the second cavity of the cavity comprises at least two sub-cavities with different cross-sectional areas and connected to each other.

[0014] The present invention also provides an aerosol generating device, which includes a microwave generating unit and the microwave heating component described in any one of the above items, wherein the microwave heating component also includes a microwave feeding unit connected to the outer conductor unit, the microwave feeding unit is connected to the microwave generating unit, and feeds the microwave generated by the microwave generating unit into the cavity.

[0015] The present invention has at least the following beneficial effects: the outer conductor unit of the present invention defines a first cavity and a second cavity with different cross-sectional areas, cancels the function of the inner conductor unit to support the aerosol generating matrix, and the aerosol generating matrix is ​​directly arranged in the first cavity with a larger cross-sectional area, which is equivalent to reducing the cross-sectional area of ​​the outer conductor unit at the position of the second cavity, which is beneficial to reducing the volume of the outer conductor unit, thereby facilitating the miniaturization of the aerosol generating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic structural diagram of the aerosol generating device of the first embodiment of the present invention when the aerosol generating substrate is installed therein;

[0018] Figure 2 is a longitudinal cross-sectional schematic diagram of the aerosol generating device of the first embodiment of the present invention when the fixing base is installed therein;

[0019] Figure 3 yes Figure 2 The aerosol generating device shown is a schematic diagram of the structure after the fixing base is omitted;

[0020] Figure 4 It is a structural schematic diagram of a straight cylindrical outer conductor unit in the prior art;

[0021] Figure 5 yes Figure 3 Schematic diagram of the viewing angle in direction A;

[0022] Figure 6 is a schematic top view of the structure of an outer conductor unit of an aerosol generating device according to a second embodiment of the present invention;

[0023] Figure 7 is a schematic top view of the structure of an outer conductor unit of an aerosol generating device according to a third embodiment of the present invention;

[0024] Figure 8 is a reflection coefficient diagram of an aerosol generating device in the prior art described in the background technology;

[0025] Fig. 9 is a reflection coefficient diagram of the aerosol generating device according to the first embodiment of the present invention;

[0026] Fig.10 A schematic diagram of the electric field distribution of an aerosol generating device using a straight cylindrical outer conductor unit in the prior art;

[0027] Fig.11 is a schematic diagram of electric field distribution of an aerosol generating device according to a first embodiment of the present invention;

[0028] Fig.12 is a schematic structural diagram of the aerosol generating device of the first embodiment of the present invention when it is installed on a radio frequency circuit board;

[0029] Fig.13 is a schematic longitudinal cross-sectional view of an aerosol generating device according to a fourth embodiment of the present invention;

[0030] Fig.14 is a schematic longitudinal cross-sectional view of an aerosol generating device according to a fifth embodiment of the present invention;

[0031] Fig.15 is a schematic diagram of the exploded structure of the aerosol generating device according to the first embodiment of the present invention;

[0032] Fig.16 yes Fig.15A schematic structural diagram of a fixing base of an aerosol generating device is shown. DETAILED DESCRIPTION

[0033] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0034] The terms "first" and "second" are only used to facilitate the description of the technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Figures 1 to 3 An aerosol generating device 1 according to a first embodiment of the present invention is shown. The aerosol generating device 1 can utilize microwaves to heat an aerosol generating substrate 2 to generate aerosol by atomization for inhalation by a user. Figure 1 A schematic diagram of an aerosol generating substrate 2 installed in an aerosol generating device 1; Figure 2 Schematic diagram of the structure of the aerosol generating device 1 itself when the aerosol generating substrate 2 is not installed in the aerosol generating device 1. In some embodiments, the aerosol generating substrate 2 is a solid aerosol generating substrate 2 such as a processed plant leaf product. It can be understood that in other embodiments, the aerosol generating substrate 2 can also be a liquid aerosol generating substrate 2.

[0036] The aerosol generating device 1 of the first embodiment of the present invention comprises a microwave heating assembly and a microwave generating unit (not shown). The microwave heating assembly comprises an outer conductor unit 10 and an inner conductor unit 11. Figure 3 , Figure 3 Shown separately Figure 2 The outer conductor unit 10 and the inner conductor unit 11 in the microwave oven are provided. The inner conductor unit 11 is arranged in the outer conductor unit 10. The outer conductor unit 10 includes an open end and a closed end. The inner conductor unit 11 also includes a fixed end and a free end. The fixed end of the inner conductor unit 11 is connected to the closed end of the outer conductor unit 10. The free end of the inner conductor unit 11 extends toward the open end of the outer conductor unit 10. Specifically, the microwave heating component can be a quarter-wavelength coaxial line resonator. The outer conductor unit 10 can achieve electromagnetic shielding. The fixed end of the inner conductor unit 11 is in direct ohmic contact with the closed end of the outer conductor unit 10 to form a short-circuit end of the microwave heating component; the free end of the inner conductor unit 11 is not in direct ohmic contact with the outer conductor unit 10 to form an open-circuit end of the microwave heating component.

[0037] like Figure 3As shown, a microwave feeding hole 1020 is provided on the outer conductor unit 10. The microwave heating assembly also includes a microwave feeding unit, which can be a coaxial connector. The microwave feeding unit is connected to the microwave generating unit and feeds the microwave generated by the microwave generating unit into the cavity 13. Specifically, the microwave feeding unit can include a radio frequency connector 4, which is threaded or flanged with the microwave feeding hole 1020, so that the radio frequency connector 4 is in direct ohmic contact with the outer conductor unit 10 and also in direct ohmic contact with the inner conductor unit 11, so that the microwave generated by the device body of the microwave feeding unit can be transmitted to the cavity 13 through the microwave feeding hole 1020. The radio frequency connector 4 can be a standard SMP-JYD radio frequency connector. At the same time, the radio frequency connector 4 is in close contact with the outer conductor unit 10 to close the microwave feeding hole 1020 to prevent the microwave from leaking from the microwave feeding hole 1020 to the outside and causing circuit failure.

[0038] like Figure 3 As shown, a cavity 13 is defined between the open end and the closed end of the outer conductor unit 10, and the cavity 13 includes a first cavity 131 and a second cavity 132 that are connected. The aerosol generating substrate 2 is placed in the first cavity 131 (hereinafter referred to as the first cavity 131) of the cavity 13, and the microwaves fed in can continuously oscillate in the cavity 13, and the aerosol generating substrate 2 is exposed to the microwave field in the cavity 13 and heated by the microwaves to be atomized.

[0039] The inner conductor unit 11 includes an axially connected probe segment 11a and an impedance matching segment 11b. The probe segment 11a of the inner conductor unit 11 is arranged in the first cavity 131, and the impedance matching segment 11b of the inner conductor unit 11 is arranged in the second cavity 132 (hereinafter referred to as the second cavity 132) of the cavity 13. It should be noted that the meaning of impedance matching is that the characteristic impedance of the transmission line is equal to the load impedance in magnitude and phase, and the energy on the transmission line is transmitted to the load with almost no reflection. The total length of the inner conductor unit 11 (the sum of the length of the probe segment 11a and the length of the impedance matching segment 11b) is equal to one quarter of the working wavelength. Preferably, the one quarter of the working wavelength can be 28mm. The length of the probe segment 11a of the inner conductor unit 11 can be less than the length of the aerosol generating matrix 2. The length of the aerosol generating matrix 2 can be 12mm, and the probe segment 11a of the inner conductor unit 11 can be 9-11mm. Therefore, the length of the impedance matching section 11 b of the inner conductor unit 11 may be changed accordingly according to the length design requirement of the probe section 11 a . For example, the length of the impedance matching section 11 b of the inner conductor unit 11 may be 17-19 mm.

[0040] like Figure 5As shown, in the first embodiment, the first cavity 131 is a complete and independent cavity. The aerosol generating substrate 2 can be directly placed in the first cavity 131, and the probe segment 11a of the inner conductor unit 11 extends into the first cavity 131 and is located on one side of the aerosol generating substrate 2. Of course, the aerosol generating substrate 2 can also be indirectly placed in the first cavity 131 through other components. For example Figure 1 and Figure 2 As shown, the aerosol generating substrate 2 is indirectly placed in the first cavity 131 through the fixing seat 3 .

[0041] Furthermore, if Figure 6 As shown, in the second embodiment, different from the first embodiment, the first cavity 131 includes a first containing area 131a and a second containing area 131b arranged on one side of the first containing area 131a, and the second containing area 131b can be connected to the first containing area 131a, and the probe segment 11a of the inner conductor unit 11 is arranged in the second containing area 131b, which is used to form a microwave field to heat and atomize the aerosol generating matrix 2 in the first containing area 131a.

[0042] Alternatively, the second receiving area 131b may not be connected to the first receiving area 131a. Figure 7 As shown, in the third embodiment, different from the second embodiment, the second receiving area 131b of the first cavity 131 is not connected to the first receiving area 131a. The barrier wall between the first receiving area 131a and the second receiving area 131b is made of a material that is permeable to microwaves, such as glass, plastic, ceramic, etc. Therefore, microwaves can pass through the barrier wall between the first receiving area 131a and the second receiving area 131b from the second receiving area 131b to heat and atomize the aerosol generating substrate 2 in the first receiving area 131a.

[0043] Since the second receiving area 131b only needs to be used to receive the probe segment 11a of the inner conductor unit 11 and does not require a too large volume, and the first receiving area 131a is used to receive the aerosol generating matrix 2 and requires a larger volume, the cross-sectional area of ​​the second receiving area 131b of the first cavity 131 can be smaller than the cross-sectional area of ​​the first receiving area 131a.

[0044] In particular, when the aerosol generating substrate 2 is directly placed in the first cavity 131, the aerosol generating substrate 2 and the probe segment 11a of the inner conductor unit 11 can be separately stored through the first receiving area 131a and the second receiving area 131b: the aerosol generating substrate 2 is limited in the first receiving area 131a of the first cavity 131; the probe segment 11a of the inner conductor unit 11 is limited in the second receiving area 131b of the first cavity 131. Thus, the position stability of the aerosol generating substrate 2 and the inner conductor unit 11 is better during use or transportation of the device.

[0045] The working principle of the aerosol generating device 1 is as follows: the radio frequency circuit of the microwave generating unit generates high-frequency energy, and the generated microwave can be transmitted to the cavity 13 by passing through the microwave feeding hole 1020 through the radio frequency connector 4. When the intrinsic frequency of the cavity 13 is equal to the external excitation frequency, the inductance and capacitance in the cavity 13 are balanced, thereby reaching a resonant state, and the aerosol generating matrix 2 is quickly heated, thereby generating aerosol. During resonance, most of the energy provided by the external radio frequency circuit is consumed by the medium and metal in the cavity 13, and the energy utilization rate reaches the highest, thereby achieving rapid heating.

[0046] like Figure 3 As shown, the cross-sectional area of ​​the first cavity 131 is greater than the cross-sectional area of ​​the second cavity 132. It should be noted that the first cavity 131 can be a cylindrical cavity, a square column cavity, or a cavity of other specific shapes, but no matter what the shape of the first cavity 131 is, it has a central axis a, which is the center line extending along the axial direction. The central axis a of the first cavity 131 is also the center line of the first cavity 131 in the axial direction, and the axial direction is also the vertical direction of the orientation in the figure, or the longitudinal direction when the aerosol generating device 1 is in normal use, or the length direction of the aerosol generating device 1. The cross section of the first cavity 131 refers to the cross-sectional plane of the first cavity 131 in the direction perpendicular to the central axis a. Similarly, the second cavity 132 also has a central axis b, and the cross section of the second cavity 132 can be defined with reference to the cross section of the first cavity 131, which will not be repeated here. As described in the background art, the prior art uses an inner conductor unit to meet the requirements of supporting the aerosol generating matrix and impedance matching, resulting in the inner conductor unit occupying too much space inside the outer conductor unit. That is, the inner conductor unit needs to have a larger cross-sectional area, and accordingly, the outer conductor unit also needs to have a larger cross-sectional area to accommodate the inner conductor unit. Figure 4As shown, the outer conductor unit in the prior art is roughly in the shape of a straight cylinder, which is relatively large in volume and is not conducive to the miniaturization of the aerosol generating device. Correspondingly, the outer conductor unit 10 of the present invention defines a first cavity 131 and a second cavity 132 with different cross-sectional areas, cancels the function of the inner conductor unit 11 to support the aerosol generating matrix 2, and directly sets the aerosol generating matrix 2 in the first cavity 131 with a larger cross-sectional area, which is equivalent to reducing the cross-sectional area of ​​the outer conductor unit 10 at the position of the second cavity 132, which is conducive to reducing the volume of the outer conductor unit 10, thereby facilitating the miniaturization of the aerosol generating device 1.

[0047] See also Figure 8 and Fig. 9 ,in Figure 8 is a reflection coefficient diagram of an aerosol generating device in the prior art described in the background technology, Fig. 9 FIG. 4 is a reflection coefficient diagram of the aerosol generating device 1 according to the first embodiment of the present invention.

[0048] In the figure, the vertical axis S(1,1) represents the reflection coefficient, which represents the ratio of the reflected wave to the incident wave. The lower S(1,1), the higher the energy utilization rate and the higher the impedance matching level. Figure 8 and Fig. 9 It can be seen that the reflection coefficient of the aerosol generating device 1 of the present invention is at a substantially equivalent level to the reflection coefficient of the aerosol generating device in the prior art, which means that the impedance matching levels of the two are equivalent.

[0049]

[0050] Table 1

[0051] As shown in Table 1, the comparative example in Table 1 refers to the aerosol generating device using an inner conductor unit to support the aerosol generating substrate described in the background art. The first embodiment refers to the first embodiment of the present invention. The inner diameter of the cavity 13 of the first embodiment refers to the diameter of the sub-cavity with the largest cross-sectional area, for example Figure 3 The inner diameter of the first cavity 131 in the first embodiment. The inner height of the cavity 13 in the first embodiment refers to the height from the top of the first cavity 131 to the bottom of the second cavity 132. As shown in Table 1, the volume of the cavity 13 in the first embodiment of the present invention is 1736mm 3 The volume of the cavity 13 of the comparative example is 3449 mm 3 By comparison, it can be seen that the volume of the cavity 13 of the aerosol generating device of the present invention is greatly reduced, which is more conducive to the miniaturization of the aerosol generating device 1 and effectively reduces the cost.

[0052] The simulation test proves that after the overall cross-sectional area of ​​the outer conductor unit 10 is reduced, the microwave energy generated during operation is roughly equivalent to the microwave energy generated during operation of the device using a straight outer conductor unit in the prior art. That is, after the volume of the outer conductor unit 10 is reduced, the microwave energy generated during operation of the device is hardly affected. Fig.10 and Fig.11 , Fig.10 The figure shows a straight outer conductor unit in the prior art, in which the inner conductor unit is placed. Fig.11 The outer conductor unit 10 of the present invention is shown, and the outer conductor unit 10 has a first cavity 131 with a larger cross-sectional area and a cavity 132 with a smaller cross-sectional area, and the inner conductor unit 11 is placed in the outer conductor unit 10. Fig.10 and Fig.11 It can be seen from the electric field strength characterization area that the areas of the highlight areas of the two are roughly the same, indicating that the electric field strength distributions of the two are roughly the same. This shows that after reducing the volume of the outer conductor unit 10, the present invention hardly affects the amount of microwave energy generated during the operation of the device.

[0053] In addition, in the prior art, in order to support the aerosol generating matrix and impedance matching, the inner conductor unit is in the form of a multi-section cylindrical shape with unequal diameters. The maximum cross-sectional area of ​​the inner conductor unit must be at least greater than the cross-sectional area of ​​the aerosol generating matrix to meet the need of supporting the aerosol generating matrix. The structure of the multi-section cylindrical inner conductor unit with unequal diameters can refer to the inner conductor unit 11 shown in the drawings of the Chinese patent publication number CN218474089U. Figure 2 and Figure 3 As shown, in this embodiment, the inner conductor unit 11 is in the shape of an elongated column. That is, the inner conductor unit 11 is a longitudinally elongated column, and the cross-sectional area of ​​the inner conductor unit 11 is equal at all locations in the axial direction (but the smooth transition areas at both ends may have a smaller cross-sectional area), and at the same time, the cross-sectional area of ​​the inner conductor unit 11 may be much smaller than the cross-sectional area of ​​the first cavity 131, which is more conducive to reducing the volume of the inner conductor unit 11.

[0054] When the inner conductor unit 11 is in the shape of an elongated column, the volume of the inner conductor unit 11 can be designed to be very small. In this case, the cross-sectional area of ​​the first cavity 132 is slightly larger than the cross-sectional area of ​​the impedance matching section 11b of the inner conductor unit 11, which is beneficial to reducing the volume of the outer conductor unit 10. The first cavity 131 needs to be used to support the aerosol generating matrix 2, and the second cavity 132 only needs to be used to accommodate the impedance matching section 11b of the inner conductor unit 11. Since the inner conductor unit 11 is in the shape of an elongated column, the second cavity 132 does not need to be too large in volume, and the volumes of the inner conductor unit 11 and the outer conductor unit 10 can be reduced, which is beneficial to miniaturization of the aerosol generating device 1.

[0055] like Figure 3 As shown in the figure, in the first embodiment, the central axis a of the first cavity 131 and the central axis b of the second cavity 132 do not coincide. The central axis a of the first cavity 131 is equivalent to the central axis of the open end of the outer conductor unit 10, and the central axis b of the second cavity 132 is equivalent to the central axis of the closed end of the outer conductor unit 10. That is, the central axes of the open end and the closed end of the outer conductor unit 10 are not on the same straight line. Figure 3 As shown, because the central axis a of the first cavity 131 and the central axis b of the second cavity 132 do not coincide, the outer conductor unit 10 presents a shape similar to an eccentric shaft, thereby forming a stepped storage area 103. Fig.12 As shown, the storage area 103 can be used to place the radio frequency circuit board 40, or to place other components, so that the structure layout of the aerosol generating device 1 is more compact, which is further conducive to the miniaturization of the aerosol generating device 1 and reduces the cost.

[0056] like Figure 3 As shown, the inner conductor unit 11 is arranged away from the central axis of the first cavity 131. When the aerosol generating substrate 2 is placed in the first cavity 131, the inner conductor unit 11 is arranged away from the central axis of the aerosol generating substrate 2. The microwave field formed by the inner conductor unit 11 can perform circumferential local heating on the aerosol generating substrate 2. In addition, a driving component can be provided to drive the aerosol generating substrate 2 to rotate relative to the inner conductor unit 11 to achieve circumferential segmented heating, which can overcome the problem of uneven heating and slow heating of the aerosol generating substrate 2.

[0057] like Figure 3 As shown, in the first embodiment, the second cavity 132 is a separate cavity. The first cavity 131 and the second cavity 132 together form a V-shaped storage area 103 below the outer conductor unit 10, which can be used to place components such as the RF circuit board 40. In other embodiments, the second cavity 132 may include at least two sub-cavities with different cross-sectional areas and connected.

[0058] For example, Fig.13As shown, in the fourth embodiment, the difference from the first embodiment is that the second cavity 132 includes two sub-cavities-sub-cavity 132a and sub-cavity 132b. At this time, the outer conductor unit 10 forms a stepped storage area 103. Of course, the number of sub-cavities of the second cavity 132 can also be three, four, five, six, etc. By adjusting the number of each sub-cavity and the cross-sectional area of ​​each sub-cavity, etc., storage areas 103 of different shapes can be formed. Storage areas 103 of different shapes can be placed here for components of different shapes and materials, so as to reasonably arrange the placement positions of the various components of the aerosol generating device 1, so that the internal structure of the device is compact, which is conducive to the miniaturization of the aerosol generating device 1.

[0059] like Figure 2 and Figure 3 As shown, in the first embodiment, the first cavity 131 and the second cavity 132 are defined by the side walls of the outer conductor unit 10 respectively: the outer conductor unit 10 includes a first side wall 101 and a second side wall 102 which are axially connected and whose central axes are not on the same straight line. The first side wall 101 defines the first cavity 131. The second side wall 102 defines the second cavity 132. A microwave feeding hole 1020 for accessing the microwave feeding unit is formed on the second side wall 102. Specifically, the outer conductor unit 10 also includes a first bottom wall 104 and a second bottom wall 105. The first bottom wall 104 is connected between the first side wall 101 and the second side wall 102, and the first bottom wall 104 and the first side wall 101 define the first cavity 131 together. That is, the first side wall 101 and the second side wall 102 are axially connected through the first bottom wall 104. The second bottom wall 105 is connected to the second side wall 102, and the second bottom wall 105 and the second side wall 102 define the second cavity 132 together. In this embodiment, the second bottom wall 105 of the outer conductor unit 10 forms the closed end of the outer conductor unit 10. The end of the probe segment 11a of the inner conductor unit 11 away from the impedance matching segment 11b is the free end of the inner conductor unit 11, and the probe segment 11a is used to form a microwave field. The end of the impedance matching segment 11b of the inner conductor unit 11 away from the probe segment 11a is the fixed end of the inner conductor unit 11, and the fixed end is fixedly connected to the second bottom wall 105, so that the inner conductor unit 11 is fixed in the cavity 13.

[0060] See also Figure 2 and Figure 3 The impedance matching section 11b of the inner conductor unit 11 is divided into an upper half and a lower half along the axial direction. Preferably, the RF connector 4 is in direct ohmic contact with the lower half of the impedance matching section 11b of the inner conductor unit 11. Specifically, Figure 2As shown, the RF connector 4 includes a main body 42 and a feeding needle 41 connected to each other. The main body 42 of the RF connector 4 is in close contact with the outer conductor unit 10. The feeding needle 41 of the RF connector 4 extends into the microwave feeding hole 1020 and is in direct ohmic contact with the impedance matching section 11b of the inner conductor unit 11. The feeding needle 41 is parallel to the second bottom wall 105 of the outer conductor unit 10.

[0061] Furthermore, if Figure 2 and Figure 3 As shown, in the first embodiment, a storage area 103 is defined between the first bottom wall 104 and the second side wall 102. The microwave feeding hole 1020 is located outside the storage area 103, that is, the microwave feeding hole 1020 is not in the storage area 103, or in other words, the microwave feeding hole 1020 is arranged on the side of the second side wall 102 away from the storage area 103, so as to avoid the microwave feeding hole 1020 causing physical position interference with the storage area 103 formed by the outer conductor unit 10, so that the storage area 103 can be used to place some components inside the device.

[0062] Of course, in other embodiments, the microwave feeding hole 1020 may also be disposed in the receiving area 103, for example Fig.14 As shown, in the fifth embodiment, the microwave feeding hole 1020 is arranged in the storage area 103, that is, the microwave feeding hole 1020 is arranged on the second side wall 102 at a position relatively closer to the central axis of the first side wall 101 (equivalent to the first cavity), so that the storage area 103 can be used for placing the RF connector 4 of the microwave feeding unit, thereby making the layout of the internal components of the aerosol generating device 1 more compact, which is conducive to the miniaturization of the aerosol generating device 1.

[0063] The outer conductor unit 10 can be made of metal material or other highly conductive materials. For example, the outer conductor unit 10 can include one or more of gold, silver, copper, aluminum, iron, gold-containing alloys, aluminum-containing alloys, copper-containing alloys, iron-containing alloys, stainless steel, etc. Alternatively, the outer conductor unit 10 can also include a non-metallic body and a metal coating disposed on the outer layer of the non-metallic body.

[0064] like Figure 2 and Figure 3 As shown, in the first embodiment, the fixed end and the free end of the inner conductor unit 11 are on the same axis. Specifically, the inner conductor unit 11 can be a long column, and its fixed end and the free end only need to be on the same axis to make the inner conductor unit 11 have better structural stability.

[0065] like Figure 3As shown, the central axis of the inner conductor unit 11 (i.e., the axis where the fixed end and the free end of the inner conductor unit 11 are located) can coincide with the central axis b of the second cavity 132, so that the inner conductor unit 11 is centrally arranged in the second cavity. Fig.13 As shown, the central axis of the inner conductor unit 11 may not coincide with the central axis b of the second cavity 132 .

[0066] like Figure 1 , Figure 2 and Fig.15 As shown, in the first embodiment, the aerosol generating device 1 further includes a fixing seat 3 disposed in the cavity 13. The fixing seat 3 is used to mount the aerosol generating substrate 2. Specifically, the fixing seat 3 is disposed in the first cavity 131 of the cavity 13. The aerosol generating substrate 2 is partially inserted into the fixing seat 3 to be fixed. That is, the aerosol generating substrate 2 is mounted in the first cavity 131 of the cavity 13 through the fixing seat 3. Specifically, the fixing seat 3 can be detachably mounted in the cavity 13, thereby facilitating the disassembly and assembly of the aerosol generating substrate 2 and facilitating cleaning.

[0067] Of course, in other embodiments, the fixing seat 3 can also be installed in the cavity 13 in an undetachable manner. In the absence of the fixing seat 3, the aerosol generating substrate 2 can also be directly installed in the cavity 13, which does not affect the heating and atomization effect. In other embodiments, the fixing seat 3 can also be set in the first cavity 131 and the second cavity 132 of the cavity 13 at the same time. In other words, the fixing seat 3 is set in the first cavity 131 of the cavity 13 and partially extends into the second cavity 132 of the cavity 13.

[0068] like Fig.16As shown, in the first embodiment, one end of the fixing seat 3 is open, and it includes a first chamber 31 for accommodating the aerosol generating substrate 2, and a second chamber 32 for accommodating the inner conductor unit 11. The bottom wall of the second chamber 32 is provided with a through hole (not shown) for the inner conductor unit 11 to pass through. The first chamber 31 is arranged on one side of the second chamber 32, so that the probe section 11a of the inner conductor unit 11 can heat one side of the aerosol generating substrate 2. The first chamber 31 is connected to the second chamber 32, and the volume of the first chamber 31 is greater than the volume of the second chamber 32, and the cross-sectional area of ​​the first chamber 31 is greater than the cross-sectional area of ​​the second chamber 32. When the aerosol generating substrate 2 is placed in the first chamber 31 and the inner conductor unit 11 is placed in the second chamber 32, the inner conductor unit 11 is parallel to the aerosol generating substrate 2, and the aerosol generating substrate 2 is heated unilaterally. In some other embodiments, the aerosol generating substrate 2 is configured to be rotatable, thereby achieving circumferential heating of the aerosol generating substrate 2. Alternatively, in other embodiments, the first chamber 31 and the second chamber 32 may not be connected, and the partition wall between the first chamber 31 and the second chamber 32 is made of a microwave-permeable material such as glass, plastic, ceramic, etc.

[0069] Furthermore, the inner wall portion of the first chamber 31 extends in a direction close to the central axis thereof, and is provided with at least two protruding clamping portions 310 that are spaced apart along the circumferential direction on the inner wall of the first chamber 31, and a first air channel 311 is defined between two adjacent clamping portions 310. When the aerosol generating substrate 2 is placed in the first chamber 31, from the cross-sectional direction of the aerosol generating substrate 2, the side wall of the aerosol generating substrate 2 is clamped and fixed by at least two clamping portions 310, and does not contact the first air channel 311. After the pressure difference is generated under the suction action of the user, the outside air can enter the first chamber 31 through the first air channel 311, which plays a role in cooling the aerosol and reducing the inhalation resistance.

[0070] Furthermore, at least two bosses 312 are provided on the inner bottom wall of the first chamber 31, and a second air channel 313 is formed between two adjacent bosses 312. From an axial perspective, the bottom surface of the aerosol generating substrate 2 is supported on at least two bosses 312 and does not contact the second air channel 313. Thus, under the action of the user's inhalation, the external air can flow through the first air channel 311, the second air channel 313 in sequence, and finally enter the bottom surface of the aerosol generating substrate 2, so as to cool the aerosol generated by the aerosol generating substrate 2 and reduce the inhalation resistance.

[0071] In the above embodiments, the technical features not mentioned can be set with reference to other embodiments. The above technical features can be combined in any way without limitation.

[0072] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A microwave heating assembly, comprising an outer conductor unit (10) and an inner conductor unit (11) arranged in the outer conductor unit (10), characterized in that: The outer conductor unit (10) is cylindrical, and the cylindrical outer conductor unit (10) defines a cavity (13), wherein the cavity (13) comprises a first cavity (131) for accommodating an aerosol generating matrix (2), and a second cavity (132) connected to the first cavity (131) of the cavity (13); the cross-sectional area of ​​the first cavity (131) of the cavity (13) is greater than the cross-sectional area of ​​the second cavity (132) of the cavity (13); the inner conductor unit (11) comprises a probe section (11a) and an impedance matching section (11b) connected axially, wherein the probe section (11a) of the inner conductor unit (11) is arranged in the first cavity (131) of the cavity (13), and the impedance matching section (11b) of the inner conductor unit (11) is arranged in the second cavity (132) of the cavity (13).

2. The microwave heating assembly according to claim 1, characterized in that: The central axis (a) of the first cavity (131) of the cavity (13) and the central axis (b) of the second cavity (132) of the cavity (13) do not overlap.

3. The microwave heating assembly according to claim 2, characterized in that: The outer conductor unit (10) comprises a first side wall (101) and a second side wall (102) which are axially connected; the first side wall (101) defines a first cavity (131) of the cavity (13); the second side wall (102) defines a second cavity (132) of the cavity (13); a microwave feeding hole (1020) is formed on the second side wall (102), and the microwave feeding hole (1020) is connected to the second cavity (132) of the cavity (13).

4. The microwave heating assembly according to claim 3, characterized in that: The outer conductor unit (10) further comprises a first bottom wall (104) connected between the first side wall (101) and the second side wall (102), wherein a storage area (103) is defined between the first bottom wall (104) and the second side wall (102); and the microwave feeding hole (1020) is located in the storage area (103).

5. The microwave heating assembly according to claim 1, characterized in that: The microwave heating assembly further comprises a fixing seat (3) for mounting the aerosol generating matrix (2); the fixing seat (3) is arranged in the cavity (13).

6. The microwave heating assembly according to claim 5, characterized in that: The fixing seat (3) comprises a first chamber (31) for accommodating an aerosol generating matrix (2), and a second chamber (32) for accommodating an inner conductor unit (11), wherein the first chamber (31) of the fixing seat (3) is arranged on one side of the second chamber (32).

7. The microwave heating assembly according to claim 6, characterized in that: At least two clamping portions (310) spaced apart along the circumferential direction are formed on the inner side wall of the first chamber (31) of the fixing seat (3); a first air channel (311) is defined between two adjacent clamping portions (310); And / or, at least two bosses (312) are provided on the inner bottom wall of the first chamber (31) of the fixing seat (3), and a second air channel (313) is formed between two adjacent bosses (312).

8. The microwave heating assembly according to any one of claims 1 to 7, characterized in that: The inner conductor unit (11) is arranged offset from the central axis of the first cavity (131).

9. The microwave heating assembly according to any one of claims 1 to 7, characterized in that: The second cavity (132) of the cavity (13) comprises at least two sub-cavities with different cross-sectional areas and which are connected.

10. An aerosol generating device, characterized in that: The microwave heating component comprises a microwave generating unit and any one of claims 1 to 9, wherein the microwave heating component further comprises a microwave feeding unit connected to the outer conductor unit (10), the microwave feeding unit is connected to the microwave generating unit, and feeds the microwave generated by the microwave generating unit into the cavity (13).

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