CN114158785A

CN114158785A - Heating element and aerosol-generating device

Info

Publication number: CN114158785A
Application number: CN202111423268.2A
Authority: CN
Inventors: 杜贤武; 李欢喜; 胡耀斌; 李日红; 周宏明
Original assignee: Shenzhen Smoore Technology Ltd
Current assignee: Shenzhen Smoore Technology Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-03-11
Also published as: WO2023093535A1

Abstract

The application provides a heating element and an aerosol-generating device. The heating component comprises a base body, an infrared heating layer and a temperature measuring layer; wherein the substrate is for insertion into an aerosol-generating article; an infrared heat generating layer surrounds the substrate for radiating infrared light when energized to heat the aerosol-generating article. This heating element has effectively improved heating efficiency, and the heating homogeneity is better, has avoided aerosol to generate local high temperature of goods, leads to the problem of being burnt.

Description

Heating element and aerosol-generating device

Technical Field

The invention relates to the technical field of electronic atomization devices, in particular to a heating assembly and an aerosol generating device.

Background

Heat Not Burning (HNB) aerosol generating devices are gaining increasing attention and popularity due to their advantages of safe, convenient, healthy, environmentally friendly, etc. use.

Existing heated non-combustible aerosol generating devices generally include a heating assembly and a power supply assembly; wherein the heating assembly is used for heating and atomizing aerosol-generating products when the power supply assembly is electrified, and the power supply assembly is connected with the heating assembly and used for supplying power to the heating assembly. The existing heating assembly generally adopts a resistance wire heating element or a conductive ceramic heating element, and when the heating assembly is electrified, the aerosol generating product is heated and atomized in a heat conduction mode.

However, the contact part of the heating assembly and the aerosol generating product is easy to generate local high temperature through a heat conduction heating mode, the aerosol generating product is easy to be burnt, and the surface of the heating assembly is easy to adhere dirt such as the aerosol generating product and the like due to the surface structure of the existing heating assembly and is not easy to clean; furthermore, as the heat transfer efficiency of the aerosol-generating article is low, the temperature difference inside and outside the aerosol-generating article is large, and the heating uniformity is poor, so that not only is the taste affected, but also the utilization rate of the aerosol-generating article is low and the preheating time is long.

Disclosure of Invention

The application provides a heating element and aerosol generation device aims at solving current heating element and generates goods through heat conduction heating aerosol and easily take place aerosol and generate goods and be burnt to and the relatively poor problem of heating homogeneity of aerosol generation goods.

In order to solve the technical problem, the application adopts a technical scheme that: a heating assembly is provided. The heating component comprises a base body, an infrared heating layer and a temperature measuring layer; wherein the substrate is for insertion into an aerosol-generating article; an infrared heat generating layer surrounds the substrate for radiating infrared light when energized to heat the aerosol-generating article.

The temperature measuring layer is arranged around the substrate and has the characteristic of Temperature Coefficient of Resistance (TCR).

The temperature measuring layer is arranged around the outside of the base body and has the characteristic of resistance temperature coefficient.

Wherein the temperature measuring layer is arranged on the outer surface of the substrate; the infrared heating layer is arranged on one side surface of the temperature measuring layer, which deviates from the base body.

The thickness of the infrared heating layer is 5-40 micrometers, and a micro-nano structure is formed on the surface of one side, away from the base body, of the infrared heating layer.

The infrared heating layer is insulated from the outer surface of the base body, and the temperature measuring layer is arranged on one side surface of the infrared heating layer, which deviates from the temperature measuring layer.

Wherein, still include: the protective layer is arranged on the surface of one side, away from the infrared heating layer, of the temperature measuring layer, can enable infrared rays to pass through and is used for protecting the temperature measuring layer.

Wherein the thickness of the protective layer is 20-200 microns; and a micro-nano structure is formed on the surface of one side, which is far away from the substrate, of the protective layer.

The infrared heating device also comprises a transition layer arranged between the temperature measuring layer and the infrared heating layer.

Wherein the transition layer is made of silicon dioxide or silicate glass; and the thickness of the transition layer is 5-10 microns.

Wherein, the temperature measuring layer is distributed in a U shape.

Wherein the substrate is in a shape of a sheet, a needle or a rod, and the radial dimension of the needle or rod-shaped substrate is 1.8-2.5 mm.

Wherein, the substrate is made of insulating materials.

Wherein, the insulating material is ceramic.

The base body comprises a conductive body and an insulating layer arranged on the outer surface of the conductive body.

The conductive body is sheet-shaped, needle-shaped or rod-shaped, and is made of metal.

The infrared heating layer is composed of a conductive phase, infrared ceramic powder and a glass combination phase.

Wherein the conductive phase comprises silver, silver palladium alloy, stainless steel alloy, TiC, ZrC, SiC and TiB₂、ZrB₂And MoSi₂One ofOne or more kinds; the infrared ceramic powder comprises one or more of black silicon, cordierite, transition metal oxide and synthetic series spinel thereof, rare earth oxide, ion co-doped perovskite, silicon carbide, zircon and boron nitride.

In order to solve the above technical problem, another technical solution adopted by the present application is: an aerosol-generating device is provided. The aerosol-generating device comprises a heating component and a power supply component; wherein the heating assembly is for heating and atomising the aerosol-generating article when energised; the power supply assembly is connected with the heating assembly and used for supplying power to the heating assembly.

Embodiments of the present application provide a heating assembly for insertion of an aerosol-generating article through a substrate by providing a substrate; meanwhile, an infrared heating layer is arranged around the base body at the periphery of the base body so as to radiate infrared rays when the infrared heating layer is electrified, and therefore the aerosol is heated and atomized through the radiated infrared rays to generate a product; the preheating efficiency of the aerosol generating product can be improved, and the temperature difference between the inside and the outside of the aerosol generating product can be effectively reduced due to the fact that the infrared radiation capability is strong, so that the heating uniformity of the aerosol generating product is improved, and the problem that the aerosol generating product is burnt due to the fact that local high temperature occurs is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

figure 1 is a schematic structural view of an aerosol-generating device provided by an embodiment of the present application;

FIG. 2 is a schematic structural view of a needle-like heating assembly;

FIG. 3a is a transverse cross-sectional view of the first embodiment of the heating assembly shown in FIG. 2;

FIG. 3b is a vertical cross-section of the first embodiment of the heating assembly shown in FIG. 2;

FIG. 4a is a transverse cross-sectional view of a second embodiment of the heating assembly shown in FIG. 2;

FIG. 4b is a vertical cross-section of the second embodiment of the heating assembly shown in FIG. 2;

FIG. 5 is a schematic structural view of a sheet heater assembly;

FIG. 6 is a vertical cross-section of the first embodiment of the heating assembly shown in FIG. 5;

fig. 7 is a vertical cross-section of the second embodiment of the heating assembly shown in fig. 5.

Reference signs

An aerosol-generating article a; a power supply assembly 10; a circuit 20; heating assemblies 30/30a/30 b; a base 31; a conductive body 311; an insulating layer 312; an infrared heat generating layer 32; a temperature measurement layer 33; a protective layer 34; a transition layer 35.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The present application will be described in detail with reference to the accompanying drawings and examples.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an aerosol-generating device according to an embodiment of the present disclosure; in this embodiment, there is provided an aerosol-generating device configured to comprise: chamber, power supply assembly 10, circuitry 20 and heating assembly 30.

Wherein the aerosol-generating article a is removably received within the chamber. The aerosol-generating article a preferably employs a tobacco-containing material that releases volatile compounds from the substrate upon heating; or it may be a non-tobacco material that is suitable for electrically heated smoking after heating. The aerosol-generating article a preferably employs a solid substrate, which may comprise one or more of a powder, granules, shredded strips, strips or flakes of one or more of vanilla leaves, tobacco leaves, homogenised tobacco, expanded tobacco; alternatively, the solid substrate may contain additional tobacco or non-tobacco volatile flavour compounds to be released when the substrate is heated.

At least part of the heating assembly 30 extends into the chamber and when the aerosol-generating article a is received within the chamber, the heating assembly 30 is inserted into the aerosol-generating article a to heat it, causing the aerosol-generating article a to release a plurality of volatile compounds, and these volatile compounds are formed by the heating process alone. The power supply assembly 10 is used for supplying power; the circuit 20 is used to conduct current between the power supply assembly 10 and the heating assembly 30. The heating element 30 may be a heating element 30a/30b according to the following embodiments.

Wherein existing heating assemblies typically heat aerosol generating articles by thermal conduction. This approach tends to cause localised high temperatures to occur in the portion of the aerosol-generating article a which is in contact with the heating assembly, leading to problems with that portion of the aerosol-generating article a being burnt. Meanwhile, as the heat conduction efficiency of the aerosol generating product A is low, the preheating time is long, the temperature difference between the part of the aerosol generating product A in contact with the heating assembly and the part of the aerosol generating product A departing from the heating assembly is large, the heating uniformity of the aerosol generating product A is poor, the smoking taste is affected, and the utilization rate of the aerosol generating product A is low. Further, since the heating unit is in contact with the aerosol-generating article a for a long time, dirt such as the aerosol-generating article a is easily adhered, and cleaning is not easy.

To solve the above technical problem, the present embodiment provides a heating assembly 30a/30b, which heating assembly 30a/30b heats an aerosol-generating article a by infrared rays by radiating infrared rays when energized; wherein, because the infrared ray has certain penetrability, does not need the medium, heating efficiency is higher, can effectively improve aerosol and generate preheating efficiency of goods A, and can effectively reduce the inside and outside temperature difference of aerosol and generate goods A to it is more even to the toast of aerosol and generate goods A, avoids appearing local high temperature and leads to aerosol and generate goods A by the problem of scorching.

Referring to fig. 2 to 3b, fig. 2 is a schematic structural diagram of the needle-shaped heating element 30 a;

FIG. 3a is a transverse cross-sectional view of the first embodiment of the heating assembly shown in FIG. 2; FIG. 3b is a vertical cross-sectional view of the first embodiment of the heating assembly 30a shown in FIG. 2; in the first embodiment, a heating element 30a is provided, and the heating element 30a has a rod shape or a needle shape and can be used in different fields, such as electronic cigarettes, medical treatment, beauty treatment and the like. The heating assembly 30a includes a base 31, an infrared heating layer 32, and a temperature measuring layer 33. In which the vertical direction in the present application refers to the lengthwise direction of the heating assembly 30a/30b, and the lateral direction refers to the direction perpendicular to the lengthwise direction of the heating assembly 30a/30 b.

Wherein the substrate 31 is for insertion of the aerosol-generating article a. The aerosol-generating article a may be a plant leaf based substrate or a cream substrate or the like. As shown in fig. 2, the matrix 31 is in the form of a solid rod or a needle to enhance the strength of the matrix 31. The radial dimension of the needle-like or rod-like substrate 31 may be 1.8-2.5 mm. The material of the substrate 31 may be a high temperature insulating material such as ceramic, quartz glass, mica, etc. to prevent the two electrodes from short circuit. Preferably, the substrate 31 may be transparent quartz. Specifically, the base plate 31 may include a body portion and an insertion portion that are axially connected. Wherein the insertion portion tapers in a direction away from the main body portion, the insertion portion of the substrate 31 being inserted into the aerosol-generating article a first during insertion of the substrate 31 into the aerosol-generating article a to reduce the insertion resistance.

The temperature measuring layer 33 is disposed on the outer surface of the substrate 31, and the temperature measuring layer 33 has a Temperature Coefficient of Resistance (TCR) characteristic. That is, the resistance value of the temperature measurement layer 33 has a monotone one-to-one correspondence with the temperature value thereof. For example, the resistance value of the temperature measuring layer 33 increases with the increase of the temperature value thereof; alternatively, the resistance value of the temperature measuring layer 33 decreases as the temperature value thereof increases. Therefore, the heating assembly 30a can monitor the temperature value of the heating assembly 30a by detecting the resistance value of the temperature measuring layer 33, and further regulate and control the temperature field of the heating assembly 30a, so as to achieve the best effect of sucking the mouth feel. The outer surface of the base 31 refers to a side surface of the base 31, and does not include an upper end surface and a lower end surface, which is taken as an example in the embodiments of the present application. Of course, in other embodiments, the outer surface of the base 31 may also refer to the side surface and the upper and lower end surfaces of the base 31.

Compare in the prior art need establish temperature-measuring element's such as temperature sensor scheme in addition, because temperature-measuring layer 33 is the stratiform, it can directly deposit in the surface of base member 31 or infrared layer 32 that generates heat, need not to set up the mounting groove or utilize mounting pieces such as screw or screw to install it fixedly at base member 31 or infrared layer 32 surface that generates heat to make this temperature-measuring layer 33 not only be convenient for set up, and the space that occupies is less. In addition, the temperature measuring layer 33 can select certain specific positions covering the base 31 or the infrared heating layer 32 and select the surface of the base 31 or the infrared heating layer 32 covering a large area according to actual requirements, so that the specific area of the surface of the base 31 or the infrared heating layer 32 can be measured, the temperature measuring accuracy is high, most of the area of the base 31 and/or the infrared heating layer 32 can be measured, and the temperature measuring range of the heating assembly 30a is effectively expanded.

Specifically, the temperature measuring layer 33 may also be formed on the surface of the substrate 31 and/or the infrared heating layer 32 by silk-screen printing, sputtering, coating, printing, or the like. The temperature measurement layer 33 may cover at least the highest temperature region of the heating element 30 to avoid problems with local excess temperatures affecting the heated mouthfeel of the aerosol-generating substrate. It will be appreciated that in a particular embodiment, the temperature sensing layer 33 covers at least the location of the substrate 31 if the highest temperature region of the heating assembly 30 corresponds to a certain region of the substrate 31; if the highest temperature region of the heating member 30 corresponds to a certain position of the infrared heat generating layer 32, the temperature measuring layer 33 covers at least the position of the infrared heat generating layer 32.

In one embodiment, the sheet resistance of temperature measuring layer 33 is 1 Ω/□ -5 Ω/□, and the temperature coefficient of resistance of temperature measuring layer 33 is 300 ppm/deg.C-3500 ppm/deg.C. Furthermore, the sheet resistance of the temperature measuring layer 33 is 2 Ω/□ -4 Ω/□, and the temperature coefficient of resistance of the temperature measuring layer 33 is 700 ppm/deg.C-2000 ppm/deg.C.

Specifically, the resistance paste for preparing the temperature measuring layer 33 comprises 10-20 parts by mass of an organic carrier, 30-45 parts by mass of an inorganic binder and 30-50 parts by mass of a conductive agent, wherein the inorganic binder comprises glass powder, and the conductive agent is selected from at least one of silver and palladium. In one embodiment, the organic carrier is selected from at least one of terpineol, ethyl cellulose, butyl carbitol, polyvinyl butyral, tributyl citrate, and polyamide wax. In one embodiment, the inorganic binder comprises a glass frit having a melting point of 700 ℃ to 780 ℃.

The temperature measuring layer 33 may be provided in one turn in the circumferential direction of the base 31. In this embodiment, two electrodes may be disposed at two predetermined positions of the temperature measuring layer 33, and the two electrodes are respectively used for connecting the positive electrode lead and the negative electrode lead to detect the resistance value of the temperature measuring layer 33. Of course, in other embodiments, the temperature measuring layer 33 may also be in an arc shape with a notch along the circumferential direction of the base 31, and two ends of the temperature measuring layer 33 where the notch is located may be formed into two electrodes to be connected with the positive lead and the negative lead, which is not limited in this application.

Specifically, the temperature measuring layer 33 may be distributed in a wave shape along the circumferential direction of the substrate 31 to cover different regions of the heating assembly 30 as much as possible, so as to sense the temperature of different positions of the heating assembly 30, and monitor the temperature of different regions of the heating assembly 30. For example, when the base 31 has a tubular shape, the temperature measuring layer 33 is provided in the middle of the base 31 and undulates along the length of the base 31 so as to cover different regions in the length of the base 31. Of course, in other embodiments, the temperature measuring layer 33 may be distributed along the circumferential direction of the substrate 31 in a linear manner, a continuous "Z" shape, a U shape, a bent shape, a dot shape, or the like.

Specifically, the temperature measuring layer 33 and the infrared heating layer 32 may be made of the same material. Wherein, the power of the temperature measuring layer 33 is larger than that of the infrared heating layer 32.

The infrared heating layer 32 is arranged on the surface of the temperature measuring layer 33 deviating from the base body 31 and surrounds the whole outer surface of the base body 31, and is used for self-heating when powered on and radiating infrared rays simultaneously, so that the aerosol is heated and atomized to generate a product A, the heating efficiency is effectively improved, the heating uniformity is good, and the problem that the aerosol generates the local high temperature of the product A and is burnt is avoided. The infrared heating layer 32 can generate heat by itself and radiate infrared rays at the same time, i.e., the functions of generating heat and radiating infrared rays are integrated into one structure, which simplifies the structure of the heating assembly 30a to some extent.

Wherein, through setting up infrared layer 32 around the whole surface in base member 31, can guarantee infrared layer 32 circular telegram back that generates heat, this heating element 30a can follow the even radiation infrared ray of the circumferential direction of base member 31 to after inserting aerosol and generating article A, can follow the circumferential direction of base member 31 and generate article A and carry out the even heating to aerosol, avoid local high temperature, lead to scorching, influence suction taste.

Specifically, the infrared heating layer 32 may be formed on the surface of the temperature measuring layer 33 away from the substrate 31 and surrounding the entire outer surface of the substrate 31 by silk-screen printing, sputtering, coating, printing, and the like. The infrared heating layer 32 has a thickness of 5-40 μm, and can be made into circuit heating or film-shaped surface heating parallel circuit. Of course, in other embodiments, the infrared heat-generating layer 32 may also be prepared by tape casting, and the green tape is integrally fired with the substrate 31, so that the production operability is strong. In this embodiment, the surface of one side that infrared heating layer 32 deviates from base member 31 is formed with micro-nano structure to reduce the bonding of aerosol generation goods A, the cleaning of follow-up heating element 30a of being convenient for promotes user experience and feels. Specifically, the micro-nano structure can be formed by using laser to etch patterns after casting, forming and drying, and the micro-nano structure can be various patterns such as a circle, a diamond, a hexagon and the like. Wherein the size of the side length of the pattern can be 0.1-1 mm.

In a specific embodiment, the infrared heating layer 32 may be composed of a combination of conductive phase, infrared ceramic powder and glass. Wherein the conductive phase comprises silver, silver-palladium alloy, stainless steel alloy, TiC, ZrC, SiC and TiB₂、ZrB₂And MoSi₂One or more than two of the above; the infrared ceramic powder is made of one or more of black silicon, cordierite, transition metal oxide and synthetic spinel, rare earth oxide, ion co-doped perovskite, silicon carbide, zircon and boron nitride.

Specifically, the infrared heating layer 32 may be an infrared ceramic coating. The infrared heating layer 32 can be an infrared heating film, and the thickness and area of the infrared heating film are not limited and can be selected as required. The infrared heating layer 32 may be a metal layer, a conductive ceramic layer or a conductive carbon layer. The infrared heating layer 32 may be in the form of a continuous film, a porous mesh, or a strip. Wherein, the material, shape and size of the infrared heating layer 32 can be set according to the requirement. In a particular embodiment, the infrared heat generating layer 32 radiates infrared light when energized to heat the aerosol-generating article a. The infrared heating wavelength is 2.5 um-20 um, aiming at the characteristic of heating aerosol to form a substrate, the heating temperature is usually required to be more than 350 ℃, and the extreme value of energy radiation is mainly in a wave band of 3-5 um.

Further, as shown in fig. 3a and 3b, the heating assembly 30a further includes a transition layer 35, and the transition layer 35 is disposed between the temperature measuring layer 33 and the infrared heat generating layer 32 and is capable of passing infrared rays. In a specific embodiment, the transition layer 35 may be an infrared-transparent glass, and may be disposed around the circumferential direction of the base 31 for buffering the expansion coefficient between the temperature measuring layer 33 and the infrared heat generating layer 32, so as to improve the overall flatness of the heating assembly 30 a. Meanwhile, the transition layer 35 can also effectively isolate the temperature measurement layer 33 from the infrared heating layer 32, so that the temperature measurement layer 33 and the infrared heating layer 32 do not interfere with each other. Specifically, the thickness of the transition layer 35 may be 5-10 μm, and the material thereof may be SiO₂Or silicate glass.

The heating assembly 30a provided by embodiments of the present application is manufactured by providing a substrate 31 for insertion of an aerosol-generating article a through the substrate 31; meanwhile, the temperature measuring layer 33 with the Temperature Coefficient of Resistance (TCR) characteristic is disposed on the surface of the substrate 31, so that the heating element 30a can monitor the temperature value of the heating element 30a by detecting the resistance value of the temperature measuring layer 33, and further regulate and control the temperature field of the heating element 30a, thereby achieving the best effect of sucking the mouth feel. Meanwhile, the infrared heating layer 32 is arranged on the surface of one side, away from the base body 31, of the temperature measuring layer 33, so that infrared rays are radiated when the infrared heating layer 32 is electrified, the aerosol generating product A is heated and atomized through the radiated infrared rays, the heating efficiency is effectively improved, the heating uniformity is good, and the problem that the aerosol generating product A is burnt due to local high temperature is solved; and through setting up infrared heating layer 32 in the surface that temperature measurement layer 33 deviates from base member 31, can avoid temperature measurement layer 33 to cause the infrared ray of radiation to block, improved heating efficiency. In addition, the transition layer 35 is arranged between the infrared heating layer 32 and the temperature measuring layer 33, so that the infrared heating layer 32 and the temperature measuring layer 33 are bonded, and the overall smoothness of the heating assembly 30a is improved.

In a second embodiment, see fig. 4a and 4b, fig. 4a is a transverse cross-sectional view of the second embodiment of the heating assembly shown in fig. 2; FIG. 4b is a vertical cross-sectional view of the second embodiment of the heating assembly 30a shown in FIG. 2; another heating assembly 30a is provided, which is different from the heating assembly 30a provided in the first embodiment in that the infrared heating layer 32 is disposed on the outer surface of the base 31, and the temperature measuring layer 33 is disposed on a side surface of the infrared heating layer 32 away from the base 31.

Further, as shown in fig. 4b, unlike the first embodiment, the heating assembly 30a further includes a protective layer 34, where the protective layer 34 is disposed on a surface of the temperature measuring layer 33 facing away from the infrared heating layer 32 and is capable of allowing infrared rays to pass through, so as to protect and seal the temperature measuring layer 33, so as to avoid the problem that the temperature measuring layer 33 is scratched during the process of inserting the aerosol-generating article a. In this embodiment, the micro-nano structure is specifically formed on a surface of the protection layer 34 facing away from the substrate 31. The specific forming mode of the micro-nano structure is similar to that of the micro-nano structure in the embodiment. Specifically, the protective layer 34 may be a protective glass layer. The material of the protection layer 34 may be infrared-transmitting glass. The thickness of the protective layer 34 may be 20-200 microns.

In this embodiment, since the resistance of the temperature measuring layer 33 is large and the temperature measuring layer 33 only implements the temperature measuring function, in the specific embodiment, the area of the temperature measuring layer 33 can be smaller than the area of the infrared heating layer 32, which not only can reduce the energy consumption, but also does not affect the heating effect of the infrared heating layer 32; meanwhile, the overall temperature field of the infrared heating layer 32 can be consistent. Specifically, the ratio of the area of the temperature measuring layer 33 to the area of the infrared heating layer 32 may range from 1: 5 to 1: 10.

the heating unit 30a according to the present embodiment can protect the temperature measurement layer 33 by further providing the protective layer 34, thereby preventing the aerosol-generating product a from being scratched.

Specifically, the infrared heating layer 32, the temperature measuring layer 33, the protective layer 34 and the transition layer 35 may be disposed around the main body portion of the base 31, and a protective layer may be disposed on an outer surface of the insertion portion of the base 31 to protect the insertion portion. Of course, the infrared heating layer 32 and/or the temperature measuring layer 33, the protective layer 34 and the transition layer 35 can also be disposed around the entire outer surface of the base 31, which is not limited in this application. Further, the thermometric layer 33 may be partially disposed corresponding to the main body of the substrate 31, so as to save cost.

In a third embodiment, referring to fig. 5 and 6, fig. 5 is a schematic structural view of a sheet heating assembly 30 b; FIG. 6 is a vertical cross-sectional view of the first embodiment of the heating assembly 30b shown in FIG. 5; the difference from the heating assembly 30a provided in the first and second embodiments described above is that: the substrate 31 is in the shape of a sheet, i.e., a plate; and the base 31 includes a conductive body 311 and an insulating layer 312 disposed on an outer surface of the conductive body 311.

Wherein the conductive body 311 is for insertion into the aerosol-generating article a. The conductive body 311 is sheet-shaped and made of metal, and specifically, the conductive body 311 may be made of stainless steel of SUS430, SUS444, or the like, so as to improve the overall strength of the conductive body 311 and avoid the problem that the conductive body 311 is bent or broken in the process of inserting the aerosol-generating article a. The insulating layer 312 may be a glass insulating layer 312, and the thickness of the insulating layer 312 may be 5-20 microns; preferably, the thickness of the insulating layer 312 may be 5-10 microns.

In this embodiment, as shown in fig. 6, in one embodiment, the temperature measuring layer 33 may be formed on a surface of the insulating layer 312 facing away from the substrate 31 by means of immersion plating or screen printing; the transition layer 35 is formed on the surface of the temperature measuring layer 33 on the side away from the insulating layer 312; the infrared heating layer 32 is formed on a surface of the transition layer 35 away from the temperature measuring layer 33, and covers an outermost layer of the heating assembly 30 b.

In this embodiment, the infrared heat-generating layer 32 may be prepared by tape casting, and the green tape may be integrally fired with the base 31, which is highly operable in production. Meanwhile, in this embodiment, a micro-nano structure is formed on a surface of the infrared heating layer 32 on a side away from the base 31 b. The specific formation manner of the micro-nano structure is similar to that of the micro-nano structure in the first embodiment.

In another specific embodiment, referring to fig. 7, fig. 7 is a vertical cross-sectional view of a second embodiment of the heating assembly 30b shown in fig. 5. The infrared heating layer 32 is formed on the surface of one side of the insulating layer 312, which is far away from the conductive body 311, and the transition layer 35 is formed on the surface of one side of the infrared heating layer 32, which is far away from the insulating layer 312; the temperature measuring layer 33 is formed on the surface of the transition layer 35, which faces away from the infrared heating layer 32. In this embodiment, the heating assembly 30b further includes a protective layer 34, and the protective layer 34 is disposed on a surface of the temperature measurement layer 33 facing away from the infrared heating layer 32 to protect the temperature measurement layer 33. The protective layer 34 may be specifically an infrared-transmitting glass, and the specific structure and function thereof are similar to those of the protective layer 34 in the above-described embodiment, as specifically described above.

It should be noted that the infrared heating layer 32, the temperature measuring layer 33, the protective layer 34 and the transition layer 35 corresponding to the present embodiment may be specifically formed on one side surface of the base 31, so that the cost can be saved; of course, the two opposite surfaces of the base 31 may also be formed with the infrared heating layer 32 and/or the temperature measuring layer 33, the protective layer 34, and the transition layer 35 to provide heating uniformity and accuracy of temperature measurement result. The surface of the substrate 31 specifically refers to the upper surface or the lower surface of the plate-shaped substrate 31, and is not a side surface corresponding to the thickness.

The heating element 30b provided by the embodiment can effectively improve the overall strength of the conductive body 311 by making the conductive body 311 made of stainless steel, and avoid the problem that the conductive body 311 is bent or broken in the process of inserting the aerosol-generating product a. Meanwhile, the conductive body 311 is sheet-shaped, so that the surface area of the substrate 31 is greatly increased compared with a rod-shaped or needle-shaped substrate 31, the uniformity of the temperature field of the aerosol generating product A is improved, and the smoking taste of the aerosol formed by atomization is improved.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A heating assembly, comprising:

a substrate for insertion of an aerosol-generating article;

an infrared heat generating layer surrounding the outside of the base body for radiating infrared rays when energized to heat the aerosol-generating article.

2. The heating element of claim 1, further comprising a temperature measuring layer surrounding the substrate, wherein the temperature measuring layer has a temperature coefficient of resistance characteristic.

3. The heating element of claim 2, wherein the temperature sensing layer is disposed on an outer surface of the substrate; the infrared heating layer is arranged on one side surface of the temperature measuring layer, which deviates from the base body.

4. The heating assembly according to claim 3, wherein the infrared heating layer has a thickness of 5-40 μm, and a micro-nano structure is formed on a surface of the infrared heating layer facing away from the base.

5. The heating assembly as claimed in claim 2, wherein the infrared heating layer is insulated from the outer surface of the base body, and the temperature measuring layer is disposed on a side surface of the infrared heating layer facing away from the temperature measuring layer.

6. The heating assembly of claim 5, further comprising:

the protective layer is arranged on the surface of one side, away from the infrared heating layer, of the temperature measuring layer, can enable infrared rays to pass through and is used for protecting the temperature measuring layer.

7. The heating assembly of claim 6, wherein the protective layer has a thickness of 20-200 microns; and a micro-nano structure is formed on the surface of one side, which is far away from the substrate, of the protective layer.

8. The heating assembly of claim 2, further comprising a transition layer disposed between the temperature measurement layer and the infrared heat generation layer.

9. The heating element of claim 8, wherein the transition layer is made of silica or silicate glass; and the thickness of the transition layer is 5-10 microns.

10. The heating element of claim 2, wherein the temperature sensing layer is U-shaped.

11. A heating element as claimed in any one of claims 1 to 10, characterized in that the matrix is in the form of a plate, a needle or a rod, the radial dimension of which is 1.8 to 2.5 mm.

12. The heating element of claim 1, wherein the substrate is an insulating material.

13. The heating element of claim 12, wherein the insulating material is ceramic.

14. The heating assembly of claim 1, wherein the base comprises an electrically conductive body and an insulating layer disposed on an outer surface of the electrically conductive body.

15. The heating element of claim 14, wherein the conductive body is in the form of a plate, a needle, or a rod, and the conductive body is made of metal.

16. The heating assembly of any one of claims 1-10, wherein the infrared heat generating layer is comprised of a conductive phase, an infrared ceramic powder, and a glass binder phase.

17. According toThe heating element of claim 16, wherein the electrically conductive phase comprises silver, silver palladium alloy, stainless steel alloy, TiC, ZrC, SiC, TiB₂、ZrB₂And MoSi₂One or more of; the infrared ceramic powder comprises one or more of black silicon, cordierite, transition metal oxide and synthetic series spinel thereof, rare earth oxide, ion co-doped perovskite, silicon carbide, zircon and boron nitride.

18. An aerosol-generating device, comprising:

a heating assembly for heating and atomising the aerosol-generating article when energised; the heating assembly is as claimed in any one of claims 1-17;

and the power supply assembly is connected with the heating assembly and used for supplying power to the heating assembly.