WO2023124523A1

WO2023124523A1 - Atomizing device and microwave heating assembly

Info

Publication number: WO2023124523A1
Application number: PCT/CN2022/129645
Authority: WO
Inventors: 杜靖; 卜桂华; 程志文; 梁峰
Original assignee: 深圳麦时科技有限公司
Priority date: 2021-12-30
Filing date: 2022-11-03
Publication date: 2023-07-06
Also published as: CN114391670A

Abstract

An atomizing device and a microwave heating assembly (10). The microwave heating assembly (10) comprises a cavity (1), a conductor column (2), a microwave feed-in device (3), and a temperature measurement device (6), wherein the cavity (1) is cylindrical and has a closed bottom, and a feed-in hole (11) is formed in a side wall of the cavity (1), so that the microwave feed-in device (3) feeds microwaves into the cavity (1) through the feed-in hole (11); the conductor column (2) is arranged at the bottom in the cavity (1), and the conductor column (2) is connected to the bottom of the cavity (1) and is electrically conductive; and the temperature measurement device (6) is arranged in the cavity (1) for measuring the temperature of an aerosol forming matrix (7) inserted into the cavity (1). The temperature measurement device (6) of the microwave heating assembly (10) can more accurately acquire the atomization temperature of the aerosol forming matrix (7) in the cavity (1), so that a user can adjust the action according to the temperature in time, and can control the release amount of harmful substances in the aerosol forming matrix (7).

Description

Atomization device and microwave heating components

technical field

The invention relates to the field of atomization, and more specifically relates to an atomization device and a microwave heating assembly.

Background technique

The heating temperature of the heat-not-burn smoking substrate is generally between 250-350°C. Compared with ordinary combustion cigarettes, heat-not-burn cigarettes can greatly reduce the harm of harmful substances in tobacco to smokers while retaining the taste of traditional cigarettes , no high-temperature combustion cracking process occurs, thereby reducing the release of tar and harmful substances in tobacco, and can greatly reduce the harm of second-hand smoke.

Ordinary microwave heating has a large volume, which is not conducive to application to the field of atomization devices that require volume. In addition, the internal temperature during microwave heating is not easy to grasp, and the temperature is too high or too low to be conducive to heating the aerosol-forming substrate. Therefore, it is necessary to detect the temperature in real time to facilitate the user to make adjustments.

Contents of the invention

The technical problem to be solved by the present invention is to provide an atomizing device and a microwave heating assembly for the above-mentioned defects of the prior art.

The technical solution adopted by the present invention to solve the technical problem is to construct a microwave heating assembly, including a cavity, a conductor column, a microwave feeding device, and a temperature measuring device;

The cavity is cylindrical and has a closed bottom, and a feed-in hole is provided on the side wall of the cavity, so that the microwave feed-in device can feed microwaves into the cavity through the feed-in hole;

The conductor column is arranged at the bottom of the cavity, and the conductor column is connected to the bottom of the cavity and conducts electricity;

The temperature measuring device is arranged in the cavity for measuring the temperature of the aerosol-forming substrate inserted into the cavity.

Preferably, a receiving hole is opened in the middle of the conductor post, and the temperature measuring device is inserted into the receiving hole.

Preferably, the temperature measurement device includes a hollow probe and a temperature measurement component, the temperature measurement component is inserted into the probe, and the outer end of the probe is closed.

Preferably, the temperature measurement component includes a thermocouple or an optical fiber.

Preferably, the probe is in ohmic contact with the conductor post.

Preferably, the microwave feed-in device is inserted into the cavity through the feed-in hole, and is in contact with the inner wall of the cavity and/or the surface of the conductor post, so as to feed microwaves into the cavity. into the microwave;

A dielectric is provided between the outer wall of the conductor column and the inner wall of the cavity.

Preferably, the cavity is made of conductive metal material.

Preferably, the inner wall of the cavity is coated with a first conductive layer.

Preferably, the conductor post is a hollow or solid structure, and the outer wall is conductive.

Preferably, the conductor post is made of conductive material.

Preferably, the outer wall of the conductor column is coated with a second conductive layer.

Preferably, the microwave feed-in device is in-line, and one end is in contact with the side wall surface of the conductor post.

Preferably, the microwave feed-in device is L-shaped, and one end is in contact with the bottom surface of the cavity.

Preferably, the dielectric body is lower than the conductor post, or flush with the conductor post, or higher than the conductor post, and lower than the cavity, or flush with the cavity height, or above the cavity.

Preferably, the inner ring of the dielectric body is provided with a positioning portion protruding toward the middle.

Preferably, the positioning parts are ribs and ribs.

Preferably, the material of the dielectric body includes alumina, corundum, mullite, forsterite, magnesia, zirconia, silicon oxide, zircon, boron nitride, aluminum nitride, spodumene, ε BaTiO3-based ceramics between 30 and 40, MgTiO3, CaTiO3-based ceramics, SrTiO3, Ba(Zn, Nb)O3-based, Ba(Sr, Ta)O3-based and BaO-Nd2O3 with ε between 70 and 90 - One or a combination of at least two of TiO2, BaO-Sm2O3-TiO2 rare earth mixed crystal systems.

Preferably, the cavity is further provided with a fixing device for fixing the aerosol-forming substrate, and the material of the fixing device is microwave-permeable.

Preferably, the loss tangent of the material of the fixing device is less than 0.1.

Preferably, the fixing device is made of plastic.

An atomization device, comprising the microwave heating assembly.

The atomization device and microwave heating assembly implementing the present invention have the following beneficial effects: the temperature measuring device of the microwave heating assembly can more accurately grasp the atomization temperature of the aerosol-forming substrate in the cavity, allowing users to make timely action adjustments according to the temperature , to control the release of harmful substances in the aerosol-forming matrix.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a block diagram of an atomization device in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the three-dimensional structure of the microwave heating assembly in the embodiment of the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of the microwave heating assembly in Fig. 1;

Fig. 4 is a structural schematic diagram of a microwave heating resonant cavity;

Fig. 5 is a schematic diagram when the dielectric body is higher than the conductor post;

Fig. 6 is a schematic diagram when the dielectric body is lower than the conductor post;

Fig. 7 is a schematic diagram when the height of the dielectric body is equal to that of the conductor post.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in Fig. 1, the atomizing device in a preferred embodiment of the present invention includes a microwave heating assembly 10, a control module 20, a battery module 30, and a microwave generator 40, and the battery module 30 is electrically connected to the control module 20 and the microwave generator 40. Connect to supply power to the control module 20 and the microwave generator 40, so that the microwave feed-in device produces 40 microwaves, and the control module 20 is used to control parameters such as microwave power output by the microwave generator 40, heating time, and start-stop interval.

As shown in FIG. 2 , the microwave heating assembly 10 includes a cavity 1 , a conductor post 2 , and a microwave feeding device 3 . The cavity 1 can be inserted into the aerosol-forming substrate 7 , which can be tobacco or the like. The microwave generating device 40 is connected with the microwave feed-in device 3, and the microwave feeding device 3 is arranged between the microwave generating device 40 and the cavity 1, and is used to transmit the microwave generated by the microwave generating device 40 into the cavity 1, and utilizes the microwave to The aerosol-forming substrate 7 inside the cavity 1 is heated.

The cavity 1 is cylindrical with one end closed, and a feed-in hole 11 is provided on the side wall of the cavity 1 . The conductor column 2 is arranged at the bottom of the cavity 1, and the conductor column 2 is connected with the bottom of the cavity 1 and conducts electricity.

The microwave feed-in device 3 is inserted into the cavity 1 through the feed-in hole 11 , and is in contact with the inner wall of the cavity 1 and/or the surface of the conductor post 2 , so as to feed microwaves into the cavity 1 .

Preferably, in this embodiment, a dielectric body 4 is provided between the outer wall of the conductor post 2 and the inner wall of the cavity 1 .

As shown in Figure 4, according to the following working principle of the λ/4 resonator:

The λ/4 coaxial resonant cavity is composed of a coaxial line with one end shorted and one end open.

The open end of the λ/4 coaxial resonant cavity is realized by a section of circular waveguide in the cut-off state. According to the boundary conditions of both ends, the cavity length l is equal to an odd multiple of λ ₀ /4 during resonance, that is, l =[(2p-1)λ ₀ ]/4(p=1, 2, 3, . . . ). Therefore, the resonance wavelength of the λ/4 coaxial resonator is:

The quality factor of the λ/4 coaxial resonator is:

The difference between the λ/4 coaxial resonator and the λ/2 coaxial resonator is that it has one less end face conductor loss.

The selection of the lateral dimensions of the λ/2 and λ/4 coaxial resonators should be determined by the following conditions:

(1) In order to ensure that the coaxial resonator works with the TEM mode without high-order mode requirements:

π(d+D)/2<λ _0min , namely: π(a+b)<λ _0min ;

(2), in order to ensure that the coaxial resonant cavity has a higher Q ₀ value, it should be taken as follows:

2≤(D/d)≤6), namely: 2≤(b/a)≤6);

(3) For the λ/4 coaxial resonant cavity, it is also necessary to ensure that the circular waveguide at the open end is in the cut-off state, which should be required: 1.71D<λ _0min , that is, 3.41b<λ _0min .

According to the calculation formula of the length l of the resonant cavity, the minimum size of the λ/4 coaxial resonant cavity is ≈1/4 of the electromagnetic wavelength. The wavelength of the 2.45GHz electromagnetic wave in the air is about 12.24cm, and at this time l is about 3.06cm, If l is to be shortened, the wavelength of the electromagnetic wave needs to be shortened. The wavelength of the electromagnetic wave in the material can be calculated according to the following formula:

For dielectric materials, μr is generally l, and when εr is larger, the wavelength is shorter, and l can also be designed to be shorter, so the miniaturization of the cavity 1 can be realized.

The microwave heating assembly 10 can reduce the length of the resonant cavity by filling the interior of the cavity 1 with high-dielectric materials, thereby realizing the reduction of the volume of the cavity 1, which is conducive to the miniaturization of the atomization device, and the cavity can be put into the aerosol to form Substrate 7, using microwaves to heat the aerosol-forming substrate 7, can greatly reduce the harm of harmful substances in tobacco to smokers, without high-temperature combustion and cracking process, thereby reducing the release of tar and harmful substances in tobacco , can greatly reduce the harm of second-hand smoke.

In some embodiments, the cavity 1 is made of conductive metal material, generally made of conductive metals such as aluminum, copper, gold, silver, and stainless steel. In other embodiments, the inner wall of the cavity 1 may also be coated with a first conductive layer 12 , such as gold plating, silver plating, copper plating, and the like.

Further, in some embodiments, the conductor post 2 is a hollow or solid structure, and the outer wall is conductive, so as to form microwave radiation in the cavity 1 after the microwave is fed into the cavity 1 .

In addition, the conductor post 2 is a conductive material, preferably a conductive metal material, or other high-conductivity material.

In other embodiments, the conductor column 2 can also be a non-metallic material, and the outer wall surface of the conductor column 2 is coated with a second conductive layer 21, and the second conductive layer 21 is a metal-plated thin film layer, such as gold-plated, silver-plated , Copper plating and so on.

As shown in FIG. 3 , in some embodiments, the microwave feeding device 3 is generally a coaxial connector, one end of which is connected to the microwave source microwave generating device 40 , and the other end is inserted into the cavity 1 through the feeding port. Generally, the microwave feed-in device 3 can be in-line, and one end inserted into the cavity 1 is in contact with the side wall surface of the conductor post 2 .

As shown in FIG. 5 , in other embodiments, the microwave feeding device 3 may also be L-shaped, and one end inserted into the cavity 1 is in contact with the bottom surface of the cavity 1 . Alternatively, the shape of one end of the microwave feeding device 3 inserted into the cavity 1 can also be arc-shaped or other shapes, as long as it can be in contact with the inner wall of the cavity 1 or the outer wall of the conductor post 2.

In some embodiments, as shown in Figure 6, the dielectric body 4 is lower than the conductor column 2, as shown in Figure 7, the dielectric body 4 can also be flush with the conductor column 2, as shown in Figure 3 and Figure 5 , the dielectric body 4 can also be higher than the conductor post 2 and lower than the cavity body 1 , and in other embodiments, the dielectric body 4 can also be level with the cavity body 1 or higher than the cavity body 1 .

As shown in Figure 3 and Figure 5, when the dielectric body 4 is higher than the conductor post 2 and lower than the cavity 1, or the dielectric body 4 is level with the cavity body 1, or the dielectric body 4 is higher than the cavity body 1 In these several cases, the dielectric body 4 also has the effect of fixing the aerosol-forming matrix 7 at the same time, that is, the inner diameter of the dielectric body 4 is slightly larger than the diameter of the aerosol-forming matrix 7, allowing the aerosol-forming matrix 7 to be inserted into the dielectric body. The inner hole of the body 4 is fixed.

Preferably, a positioning portion (not shown) protruding toward the middle is provided on the inner ring of the dielectric body 4 , which can position and engage the aerosol-forming substrate 7 inserted into the dielectric body 4 . Usually, the positioning parts are ribs and ribs, which can not only fix the aerosol-forming substrate 7, but also form an air channel between the inner wall surface of the dielectric body 4 and the aerosol-forming substrate 7 to allow the smoke to flow.

In some other embodiments, as shown in Fig. 6 and Fig. 7, when the dielectric body 4 is lower than the conductor column 2, or is flush with the conductor column 2, it is not easy to fix the aerosol-forming substrate 7 by the dielectric body 4 At this time, a fixing device 5 for fixing the aerosol-forming substrate 7 can also be provided in the cavity 1, the material of the fixing device 5 can penetrate microwaves, and the aerosol-forming substrate 7 can be microwave atomized.

Further, the loss tangent of the material of the fixing device 5 is less than 0.1, and the material of the fixing device 5 is plastic. Specifically, it may be peek, that is, polyether ether ketone.

In some embodiments, the material of the dielectric body 4 may include alumina, corundum, mullite, forsterite, magnesia, zirconia, silicon oxide, zircon, boron nitride, aluminum nitride, spodumene Stone and various glass dielectric materials, etc. BaTiO3 series porcelain, MgTiO3, CaTiO3 series porcelain, SrTiO3, Ba(Zn, Nb)O3 series, Ba(Sr, Ta)O3 series and One or a combination of at least two of BaO-Nd2O3-TiO2, BaO-Sm2O3-TiO2 rare earth mixed crystal systems with ε between 70 and 90.

Preferably, the material of the dielectric body 4 is alumina or zirconia.

As shown in Figures 3, 5, 6, and 7, in order to more accurately grasp the atomization temperature of the aerosol-forming substrate 7 in the cavity 1, and allow the user to make timely action adjustments according to the temperature, there is also a setting in the cavity 1 There is a temperature measuring device 6 for measuring the temperature of the aerosol-forming substrate inserted into the chamber. Preferably, a housing hole 22 is opened in the middle of the conductor post 2 , and the temperature measuring device 6 is inserted in the housing hole 22 to sense the temperature value in the middle of the cavity 1 .

Further, in this embodiment, the temperature measuring device 6 includes a hollow probe 61 and a temperature measuring component 62, the temperature measuring component 62 is inserted into the probe 61, and the outer end of the probe 61 is closed. Typically, the temperature measurement component 62 includes a thermocouple or an optical fiber, preferably a thermocouple.

The central probe makes it possible to measure temperature using a thermocouple (ptc/ntc), and the housing probe 61 of the temperature measuring device 6 is in ohmic contact with the conductor post 2 .

It can be understood that the above technical features can be used in any combination without limitation.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of the present invention in the same way.

Claims

A microwave heating assembly, characterized in that it includes a cavity (1), a conductor post (2), a microwave feeding device (3), and a temperature measuring device (6);

The cavity (1) is cylindrical and has a closed bottom, and a feed-in hole (11) is provided on the side wall of the cavity (1) to allow the microwave feed-in device (3) to pass through the feed-in hole (11). The inlet hole (11) feeds microwaves into the cavity (1);

The conductor column (2) is arranged at the bottom of the cavity (1), and the conductor column (2) is connected to the bottom of the cavity (1) and conducts electricity;

The temperature measuring device (6) is arranged in the cavity (1) for measuring the temperature of the aerosol-forming substrate inserted into the cavity.
The microwave heating assembly according to claim 1, characterized in that a housing hole (22) is opened in the middle of the conductor column (2), and the temperature measuring device (6) is inserted into the housing hole (22) .
The microwave heating assembly according to claim 1, characterized in that, the temperature measuring device (6) comprises a hollow probe (61) and a temperature measuring component (62), and the temperature measuring component (62) is inserted into Inside the probe (61), the outer end of the probe (61) is closed.
The microwave heating assembly according to claim 3, characterized in that, the temperature measuring assembly (62) comprises a thermocouple or an optical fiber.
The microwave heating assembly according to claim 3, characterized in that the probe (61) is in ohmic contact with the conductor post (2).
The microwave heating assembly according to any one of claims 1 to 5, characterized in that the microwave feed-in device (3) is inserted into the cavity (1) through the feed-in hole (11), and is connected with The inner wall surface of the cavity (1) and/or the surface of the conductor column (2) are in contact with each other, so as to feed microwaves into the cavity (1);

A dielectric body (4) is provided between the outer wall surface of the conductor column (2) and the inner wall surface of the cavity (1).
The microwave heating assembly according to claim 6, characterized in that, the cavity (1) is made of conductive metal material.
The microwave heating assembly according to claim 6, characterized in that, the inner wall surface of the cavity (1) is coated with a first conductive layer (12).
The microwave heating assembly according to any one of claims 1 to 5, characterized in that the conductor column (2) is a hollow or solid structure, and the outer wall is conductive.
The microwave heating assembly according to any one of claims 1 to 5, characterized in that the conductor column (2) is made of conductive material.
The microwave heating assembly according to any one of claims 1 to 5, characterized in that, the outer wall surface of the conductor column (2) is coated with a second conductive layer (21).
The microwave heating assembly according to claim 6, characterized in that the microwave feed-in device (3) is in-line, and one end is in contact with the side wall of the conductor post (2).
The microwave heating assembly according to claim 6, characterized in that, the microwave feed-in device (3) is L-shaped, and one end is in contact with the bottom surface of the cavity (1).
The microwave heating assembly according to claim 6, characterized in that, the dielectric body (4) is lower than the conductor column (2), or is flush with the conductor column (2), or is higher than the The conductor post (2) is lower than the cavity (1), or is at the same height as the cavity (1), or is higher than the cavity (1).
The microwave heating assembly according to claim 14, characterized in that, the inner ring of the dielectric body (4) is provided with a positioning portion protruding toward the middle.
The microwave heating assembly according to claim 15, characterized in that, the positioning parts are ribs and ribs.
The microwave heating assembly according to claim 6, characterized in that, the material of the dielectric body (4) includes alumina, corundum, mullite, forsterite, magnesia, zirconia, silicon oxide, zircon Stone, boron nitride, aluminum nitride, spodumene, BaTiO3 series ceramic materials with ε between 30 and 40, MgTiO3, CaTiO3 series ceramic materials, SrTiO3, Ba(Zn, Nb)O3 series, Ba(Sr, Ta ) O3 system and BaO-Nd2O3-TiO2, BaO-Sm2O3-TiO2 rare earth mixed crystal system with ε between 70-90 or a combination of at least two kinds.
The microwave heating assembly according to any one of claims 1 to 5, characterized in that the cavity (1) is also provided with a fixing device (5) for fixing the aerosol-forming substrate (7), and the fixing device (5) The material can penetrate microwaves.
The microwave heating assembly according to claim 18, characterized in that the loss tangent of the material of the fixing device (5) is less than 0.1.
The microwave heating assembly according to claim 18, characterized in that, the material of the fixing device (5) is plastic.
An atomization device, characterized by comprising the microwave heating assembly described in any one of claims 1-20.