WO2023024862A1

WO2023024862A1 - Electronic atomization device, atomizer, atomization core, and preparation method for atomization core thereof

Info

Publication number: WO2023024862A1
Application number: PCT/CN2022/110079
Authority: WO
Inventors: 刘剑; 刘望生; 张威; 夏慕楠; 徐婷; 龙继才; 周宏明
Original assignee: 深圳麦克韦尔科技有限公司
Priority date: 2021-08-27
Filing date: 2022-08-03
Publication date: 2023-03-02
Also published as: CN113712279A

Abstract

An electronic atomization device (100), an atomizer (1), an atomization core (12), and a preparation method for the atomization core (12). The atomization core (12) comprises: a tubular porous matrix (121), an atomization cavity (126) being formed at the interior thereof; and a heating element (127), the heating element (127) being disposed on the inner wall of the atomization chamber (126), and the heating element (127) being used to heat and atomize a substrate to be atomized that is introduced by the tubular porous matrix (121). The tubular porous matrix (121) comprises an inner tube (124) and an outer tube (122) sleeved on the exterior of the inner tube (124). The outer surface of the inner tube (124) fits tightly to the inner surface of the outer tube (122). The heating element (127) is disposed on the inner surface of the inner tube (124), and the heat conductivity coefficient of the inner tube (124) is greater than that of the outer tube (122). The heat conductivity coefficient of the inner layer tube (124) is greater than that of the outer layer tube (122), which can enable the inner layer tube (124) to quickly share the heat from the inner wall surface of the atomization cavity (126) so as to prevent the problem of dry burning due to the high temperature of the inner wall surface of the atomization cavity (126), and the heat in the inner tube (124) can further heat and atomize the substrate to be atomized, thereby increasing the content of aerosol, and increasing user satisfaction.

Description

Electronic atomization device, atomizer, atomization core and preparation method of atomization core

Cross References to Related Applications

This application claims its priority based on the Chinese patent application 2021109962986 submitted on August 27, 2021, and its entire description is incorporated herein by reference.

technical field

The present application relates to the technical field of electronic atomizers, in particular to an electronic atomization device, an atomizer, an atomizing core and a method for preparing the atomizing core.

Background technique

At present, most of the ceramic atomizing cores in electronic atomization devices adopt a structure that integrates liquid conduction and heat generation. Among them, the mainstream forms of heating elements include heating wire and heating film. Among them, the ceramic atomizing core still has the problems of low aerosol content and dry burning.

At present, the circuit control and the improvement of the structure of the liquid storage chamber are two ways to prevent or reduce dry burning, but the problem has not been solved from the ceramic atomizing core itself. In order to avoid the risk of dry burning of the atomizing core, the thermal power density of the heating film is currently designed to be relatively low, resulting in less aerosol content in the electronic atomizing device, which reduces the satisfaction of users. On the other hand, the heat-generating ceramic atomizing core with a straight-through tubular inner wall is only limited to the atomization form in which the airflow is tangential to the atomizing surface, and the taste is single.

Contents of the invention

The technical problem mainly solved by this application is to provide an electronic atomization device, an atomizer, an atomization core and a method for preparing the atomization core thereof, so as to solve the problem of dry burning and low aerosol content in the atomization core in the prior art. question.

In order to solve the above technical problems, the first technical solution adopted by this application is to provide an atomizing core, which includes: a tubular porous substrate with an atomizing cavity formed inside; a heating element, which is arranged in the atomizing cavity On the inner wall of the inner tube, the heating element is used to heat and atomize the substrate to be atomized introduced by the tubular porous matrix; wherein, the tubular porous matrix includes an inner tube and an outer tube sleeved outside the inner tube, and the outer tube of the inner tube The surface is in close contact with the inner surface of the outer tube, the heating element is arranged on the inner surface of the inner tube, and the thermal conductivity of the inner tube is greater than that of the outer tube.

Wherein, the difference between the thermal conductivity of the inner tube and the thermal conductivity of the outer tube is greater than 0.8 W/(m·K).

Wherein, the porosity of the inner tube is 40-75%, the pore diameter of the inner tube is 20-100 microns, and the thermal conductivity of the inner tube is 1W/(m.K)-10W/(m.K).

Wherein, the porosity of the outer tube is 30% to 70%, and the pore diameter of the outer tube is 10 microns to 100 microns, and the thermal conductivity of the outer tube is 0.2W/(m.K) to 2W/(m.K).

Wherein, the heat flux density of the heating element is 0.8W/mm ³ -2W/mm ³ .

Wherein, the inner layer pipe surrounds an atomization chamber, and the shape of the atomization chamber is a cone-shaped frustum.

Wherein, the angle between the annular side wall and the bottom surface of the conical truncated truss is greater than 60° and less than 90°.

Wherein, the tubular porous substrate is a hollow cylinder, and the shape of the atomization chamber is a conical truncated.

Wherein, the outer diameter of the hollow cylinder is 2.5mm-10mm; the diameter of the top surface of the conical pedestal is smaller than the diameter of the bottom surface of the conical pedestal.

Wherein, the tube wall thickness of the inner tube is uniform, and the tube wall thickness of the outer tube gradually decreases along the direction from the top surface of the conical truncated to the bottom surface of the conical truncated.

In order to solve the above technical problems, the second technical solution adopted by this application is to provide an atomizer, which includes: a housing with a liquid storage chamber for storing the substance to be atomized; an atomizing core, It is arranged in the casing; wherein, the atomizing core is the aforementioned atomizing core, and the substrate to be atomized in the liquid storage chamber is transferred to the atomizing chamber through the tubular porous matrix.

In order to solve the above technical problems, the third technical solution adopted by this application is to provide an electronic atomization device, including: an atomizer; the atomizer is the atomizer mentioned above; Power and control the work of the atomizer.

In order to solve the above-mentioned technical problems, the fourth technical solution adopted by this application is to provide a method for preparing an atomizing core. The method for preparing the atomizing core includes: preparing a porous sheet green body, and The heating circuit is made on the above; the porous sheet green body is wound on the mold to form a prefabricated inner tube; wherein, the heating circuit is arranged on the inner surface of the prefabricated inner tube; the prefabricated outer tube is formed on the outer surface of the prefabricated inner tube removing the mold, and sintering the prefabricated outer tube, the prefabricated inner tube and the heating circuit as a whole; wherein, the thermal conductivity of the prefabricated inner tube after sintering is greater than that of the prefabricated outer tube after sintering.

Wherein, the raw material for forming the porous sheet green body includes the first powder and the first solvent, the first powder includes ceramic powder, the first sintering aid and the pore-forming agent, and the percentage of the first sintering aid in the mass of the ceramic powder is 20% to 70%, the percentage of the pore-forming agent to the mass of the ceramic powder is 40% to 150%, the first solvent includes a solvent, a dispersant, a binder and a plasticizer, and the mass percentage of the binder is the first powder The mass percentage of the dispersant is 0.3-3% of the first powder, and the mass ratio of the plasticizer to the binder is 0.5-0.6.

Wherein, the first powder includes at least one of silicon dioxide, aluminum oxide, silicon carbide, silicon nitride, diatomaceous earth, and hydroxyapatite.

Wherein, the raw material for forming the prefabricated outer tube includes a second powder and a skeleton aid, the second powder includes ceramic powder, a second sintering aid and a pore-forming agent, and the second sintering aid accounts for 20% of the mass of the ceramic powder. % to 75%, the percentage of the pore-forming agent to the mass of the ceramic powder is 20% to 80%, the percentage of the second powder to the sum of the mass of the second powder and the skeleton additive is 55% to 80%, and the skeleton additive includes the skeleton Fillers, surfactants, plasticizers, mold release agents, skeleton fillers account for 80% to 90% of the mass of skeleton additives, and surfactants account for 1% to 5% of the mass of skeleton additives. The plasticizer accounts for 1% to 12% of the mass of the skeleton auxiliary agent, and the percentage of the release agent to the mass of the skeleton auxiliary agent is 0.5% to 3%.

Wherein, the second powder includes at least one of silicon dioxide, silicon powder, quartz sand, mullite, kaolin or cordierite.

The beneficial effect of the present application is: different from the situation of the prior art, it provides an electronic atomization device, an atomizer, an atomization core and a method for preparing the atomization core thereof. The atomization core includes: a tubular porous substrate, an internal An atomization chamber is formed; the heating element is arranged on the inner wall of the atomization chamber, and the heating element is used to heat and atomize the substrate to be atomized introduced into the tubular porous matrix; wherein, the tubular porous matrix includes an inner tube and a sleeve The outer tube outside the inner tube, the outer surface of the inner tube is in close contact with the inner surface of the outer tube, the heating element is arranged on the inner surface of the inner tube, and the thermal conductivity of the inner tube is greater than that of the outer tube . In this application, the thermal conductivity of the inner tube is greater than that of the outer tube, so that the inner tube can quickly share the heat on the inner wall of the atomization chamber, preventing the inner wall of the atomization chamber from being too hot and causing dry burning, and the inner The heat in the layer tube can further heat and atomize the substrate to be atomized, thereby increasing the content of aerosol and improving the satisfaction of users.

Description of drawings

Fig. 1 is a schematic structural diagram of an electronic atomization device provided by the present application;

Fig. 2 is a schematic diagram of the longitudinal section structure of the electronic atomization device provided by the present application;

Fig. 3 is a schematic structural diagram of the atomization core in the electronic atomization device provided by the present application;

Fig. 4 is a top view of the end of the atomizing core near the suction nozzle in Fig. 3;

Fig. 5 is a bottom view of the end of the atomizing core in Fig. 3 close to the power supply assembly;

Fig. 6 is a schematic flow diagram of an embodiment of the preparation method of the atomizing core provided by the present application;

Fig. 7(a) is a schematic structural diagram corresponding to step S21 of the preparation method of the atomizing core provided in Fig. 6;

Fig. 7(b) is a schematic structural diagram corresponding to step S22 of the preparation method of the atomizing core provided in Fig. 6;

Fig. 7(c) is a schematic structural diagram corresponding to step S23 of the preparation method of the atomizing core provided in Fig. 6;

FIG. 7( d ) is a schematic structural diagram corresponding to step S24 of the manufacturing method of the atomizing core provided in FIG. 6 .

Detailed ways

The solutions of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

In the following description, for purposes of illustration rather than limitation, specific details, such as specific system architectures, interfaces, and techniques, are set forth in order to provide a thorough understanding of the present application.

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The terms "first", "second", and "third" in this application are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship between the various components in a certain posture (as shown in the drawings) , sports conditions, etc., if the specific posture changes, the directional indication also changes accordingly. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

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 present application. The occurrences of this 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 understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Please refer to Figure 1 and Figure 2, Figure 1 is a schematic structural diagram of the electronic atomization device provided by the present application; Figure 2 is a schematic structural diagram of the longitudinal section of the electronic atomization device provided by the present application. In this embodiment, an electronic atomization device 100 is provided, and the electronic atomization device 100 can be used for atomizing the substance to be atomized. The electronic atomization device 100 includes an atomizer 1 and a power supply assembly 2 connected to each other. The atomizer 1 is used to store the substrate to be atomized and atomize the substrate to be atomized to form an aerosol that can be inhaled by the user. The substrate to be atomized can be liquid substrates such as medicinal liquid and plant grass liquid; atomizer 1 It can be used in different fields, such as medical treatment, beauty treatment, electronic aerosolization, etc. The power supply assembly 2 includes a battery 21, an airflow sensor (not shown in the figure), and a controller (not shown in the figure); the power supply assembly 2 is used to supply power to the atomizer 1 and control the operation of the atomizer 1, so that the atomizer 1 The substrate to be atomized is atomized to form an aerosol; the airflow sensor is used to detect airflow changes in the electronic atomization device 100, and the controller activates the electronic atomization device 100 according to the airflow changes detected by the airflow sensor. The atomizer 1 and the power supply assembly 2 can be integrated or detachably connected, and can be designed according to specific needs. Of course, the electronic atomization device 100 also includes other components in the existing electronic atomization device 100, such as microphones, brackets, etc. The specific structures and functions of these components are the same or similar to those of the prior art. For details, please refer to the existing technology, which will not be repeated here.

The atomizer 1 includes a suction nozzle 13 , a housing 11 and an atomizing core 12 . The casing 11 has an installation space 111 , the atomizing core 12 is accommodated in the installation space 111 , and the outer wall of the atomizing core 12 cooperates with the inner wall of the installation space 111 to form a liquid storage chamber 112 . The liquid storage chamber 112 is used to store the substance to be atomized. The substance to be atomized stored in the liquid storage chamber 112 is transferred to the inner wall of the atomization chamber 126 through the atomization core 12 and can be atomized to form an aerosol. The atomizing cavity 126 of the atomizing core 12 is directly connected to the air outlet channel 131 in the suction nozzle 13 , and the aerosol atomized by the atomizing core 12 is inhaled by the user through the air outlet channel 131 in the suction nozzle 13 . Wherein, the atomizing core 12 is electrically connected with the power supply assembly 2 to heat and atomize the substrate to be atomized.

Please refer to Figure 3 to Figure 5, Figure 3 is a schematic structural diagram of the atomization core in the electronic atomization device provided by the present application; Figure 4 is a top view of the end of the atomization core in Figure 3 near the suction nozzle; Figure 5 is a schematic view of the atomization core in Figure 3 Bottom view of the end of the middle atomizing core near the power supply assembly. In this embodiment, the atomizing core 12 includes a tubular porous base 121 and a heating element 127 . An atomizing chamber 126 is formed inside the tubular porous base 121, and a heating element 127 is disposed on the inner wall of the atomizing chamber 126. The heating element 127 is used to heat and atomize the substrate to be atomized introduced into the tubular porous base 121 to form an aerosol.

Please refer to Fig. 3, the tubular porous matrix 121 comprises an inner layer tube 124 and an outer layer tube 122 sleeved outside the inner layer tube 124, the outer surface of the inner layer tube 124 is in close contact with the inner surface of the outer layer tube 122, and the inner layer tube 124 forms an atomizing chamber 126 . The heating element 127 is disposed on the surface of the inner tube 124 away from the outer tube 122 , that is, the heating element 127 is disposed on the inner wall of the atomizing chamber 126 . The surface of the inner tube 124 with the heating element 127 is used as the atomizing surface 125 of the atomizing core 12 , and the surface of the outer tube 122 away from the inner tube 124 is used as the liquid-absorbing surface 123 of the atomizing core 12 . Wherein, the material for making the inner layer tube 124 is different from the material for making the outer layer tube 122, and the thermal conductivity of the inner layer tube 124 is greater than that of the outer layer tube 122, so that the inner layer tube 124 can quickly disperse the atomizing surface 125 The heat of the atomizing core 12 is avoided from being too hot and the problem of dry heat occurs. In a specific embodiment, the heat generated by the heating element 127 can be quickly transferred to the inner tube 124, so that the heat of the inner tube 124 can also heat the atomized substrate to be atomized. That is to say, the substrate to be atomized is heated simultaneously by the heating element 127 and the inner tube 124 to generate an aerosol, thereby increasing the content of the aerosol. Wherein, the difference between the thermal conductivity of the inner tube 124 and the outer tube 122 is greater than 0.8 W/(m·K), so as to prevent the heat from the inner tube 124 from being transferred to the outer tube 122 . Wherein, the thermal conductivity of the outer tube 122 is 0.2W/(m·K)～2W/(m·K); and the thermal conductivity of the inner tube 124 can be 1W/(m·K)～10W/(m·K) K). In order to further increase the content of aerosol, the heat flux density of the heating element 127 is 0.8W/mm ³ -2W/mm ³ . The greater the heat flux density, the faster the heating element 127 heats and atomizes the substrate to be atomized.

In order to gradually speed up the transfer of the substrate to be atomized from the liquid-absorbing surface 123 to the atomizing surface 125, and to avoid insufficient liquid supply on the atomizing surface 125 and dry burning, the porosity of the inner tube 124 is greater than that of the outer tube 122. Porosity, the micropore diameter of the inner tube 124 is greater than the micropore diameter of the outer tube 122 . In this embodiment, the porosity of the outer tube 122 is 30% to 70%, the porosity of the inner tube 124 is 40% to 75%; the pore diameter of the outer tube 122 is 10 microns to 100 microns, The pore diameter of the layer tube 124 is 20 microns to 100 microns.

The inner tube 124 is surrounded by an atomization chamber 126 . Wherein, the longitudinal section of the atomizing chamber 126 is quadrilateral. Wherein, the quadrilateral may be a rectangle or a trapezoid. Specifically, the shape of the atomizing chamber 126 is a truncated cone. Specifically, the shape of the atomizing chamber 126 may be a conical truncated pyramid, a triangular pyramid truss, a quadrangular pyramid shaped truss, a hexagonal pyramid shaped truss or other polygonal pyramid shaped trusses. Wherein, the longitudinal section of the atomization chamber 126 is trapezoidal. Specifically, the longitudinal section of the atomization chamber 126 may be an isosceles trapezoid, a right-angled trapezoid, or an ordinary trapezoid. By setting the atomization chamber 126 as a conical platform, the contact area between the airflow and the atomization surface can be increased, so that the airflow can mix more aerosols, thereby increasing the aerosol content and improving user satisfaction. Referring to FIG. 3 , the conical truss includes an annular sidewall 1261 , a top surface 1262 and a bottom surface 1263 connected to the annular sidewall 1261 , and in this application, the bottom surface 1263 is larger than the top surface 1262 . The bottom surface 1263 is arranged close to the air inlet of the atomizer 1, and the atomization chamber 126 communicates with the air inlet, so that the external airflow is transmitted from the bottom surface 1263 of the atomization chamber 126 to the inside of the atomization chamber 126 through the air inlet; the top surface 1262 is close to the air outlet channel 131 of the suction nozzle 13, and the atomization chamber 126 communicates with the air outlet channel 131, and the airflow in the atomization chamber 126 carries aerosol out from the top surface 1262 of the atomization chamber 126 to enter the air outlet of the suction nozzle 13 Channel 131. The top surface 1262 and the bottom surface 1263 of the cone are parallel to each other. The surface connecting the top surface 1262 and the bottom surface 1263 of the conical frustum is the annular side surface 1261 of the conical frustum. In order to enable the airflow entering the atomization chamber 126 to go directly to the atomization surface 125, and to enable the airflow to take away more aerosols and improve the user's taste experience, the angle between the side and the bottom of the trapezoid is greater than 60° and less than 90°. Specifically, the angle formed by the annular side wall 1261 and the bottom surface 1263 of the conical truncated cone is greater than 60° and less than 90°. If the angle between the annular side wall 1261 and the bottom surface 1263 of the conical pedestal is too large, the airflow still cannot reach the effect of going straight to the atomizing surface 125, and then cannot take away more aerosol; if the annular side wall 1261 of the conical pedestal If the angle with the bottom surface 1263 is too small, the size of the atomizing core 12 is too small, and the space of the formed atomizing chamber 126 is insufficient, and it is not convenient to generate more aerosol.

In this embodiment, the tubular porous matrix 121 is a hollow cylinder, and the shape of the atomizing chamber 126 is a conical frustum. The diameter of the top surface 1262 of the conical frustum is smaller than the diameter of the bottom surface 1263 of the conical frustum. In this embodiment, the outer diameter of the hollow cylinder is 2.5mm-10mm; due to the limitation of the outer diameter of the hollow cylinder, if the angle between the annular side wall 1261 and the bottom surface 1263 of the conical truss is too small, a larger outer diameter needs to be manufactured The atomization core 12 can meet the demand, which runs counter to the miniaturization of the ceramic atomization core 12. Therefore, in the longitudinal section of the atomization chamber 126 formed in the hollow cylinder, the annular side wall 1261 and the bottom surface 1263 of the conical truncated form The angle must be greater than 60° and less than 90°.

Since the tubular porous matrix 121 is a hollow cylinder, that is, the outer diameters of both ends of the tubular porous matrix 121 are the same. The tube wall thickness of the inner tube 124 is uniform, and the tube wall thickness of the outer tube 122 gradually decreases along the direction from the top surface 1262 to the bottom surface 1263 of the conical frustum.

The heating element 127 can be a heating wire or a heating film. The heating element 127 in this embodiment includes a heating circuit 128 and an electrode connector 129 , and the electrode connecting member 129 is electrically connected to the electrodes provided at both ends of the heating circuit 128 . The heating circuit 128 is disposed on the inner wall of the inner tube 124 , and the heating circuit 128 may be disposed on the inner wall surface of the inner tube 124 , or embedded or buried in the inner wall of the inner tube 124 . The electrodes are arranged on the inner wall of the inner tube 124 and are electrically connected to both ends of the heating circuit 128 . The electrode connector 129 is used to connect the power supply assembly 2 and supply power to the heating circuit 128 through the electrodes. The periphery of the atomizing core 12 is provided with a liquid storage chamber 112 or the liquid storage chamber 112 is set around the atomizing core 12. The liquid storage chamber 112 is used to store the substance to be atomized, and the substance to be atomized in the liquid storage chamber 112 passes through the tubular porous The base body 121 is introduced into the atomization cavity 126 of the atomization core 12 .

Wherein, the battery 21 can be arranged at the bottom of the atomizing core 12 , and the battery 21 is electrically connected with the electrode connector 129 ; the suction nozzle 13 is arranged at the top of the atomizing core 12 .

When the user uses the electronic atomization device 100, the power is turned on, and the heating circuit 128 heats and atomizes the substrate to be atomized transmitted by the tubular porous substrate 121 to form an aerosol, and at the same time, the inner tube 124 quickly disperses the heat of the atomization surface 125, Avoid dry burning of the atomizing surface 125 due to excessive temperature, and the heat dispersed in the inner tube 124 can further heat the atomized substrate to be atomized to form an aerosol, thereby increasing the content of the aerosol. The aerosol enters the user's mouth through the air outlet channel 131 in the suction nozzle 13 in the atomization chamber 126. The entire airway is short and the aerosol content is high, which can meet the user's demand for aerosol volume and taste.

An electronic atomization device provided in this embodiment includes: a tubular porous substrate with an atomization chamber formed inside; a heating element, which is arranged on the inner wall of the atomization chamber, and is used for introducing the tubular porous substrate to be atomized. The matrix is heated and atomized; wherein, the tubular porous matrix includes an inner tube and an outer tube sleeved outside the inner tube, the outer surface of the inner tube is in close contact with the inner surface of the outer tube, and the heating element is arranged on the inner layer The inner surface of the tube, the thermal conductivity of the inner tube is greater than the thermal conductivity of the outer tube. In this application, the thermal conductivity of the inner tube is greater than that of the outer tube, so that the inner tube can quickly share the heat on the inner wall surface of the atomization chamber, preventing the problem of dry burning caused by the excessive temperature of the inner wall surface of the atomization chamber, and The heat in the inner tube can further heat and atomize the substrate to be atomized, thereby increasing the content of aerosol and improving the satisfaction of users.

Please refer to Figure 6, Figure 7(a) to Figure 7(d), Figure 6 is a schematic flow chart of an embodiment of the preparation method of the atomizing core provided by the present application; Figure 7(a) is the atomizing core provided in Figure 6 Fig. 7(b) is a schematic structural diagram corresponding to step S22 of the preparation method of the atomizing core provided in Fig. 6; Fig. 7(c) is a step of the preparation method of the atomizing core provided in Fig. 6 The structural diagram corresponding to S23; FIG. 7(d) is a structural schematic diagram corresponding to step S24 of the preparation method of the atomizing core provided in FIG. 6 . This embodiment provides a preparation method of the atomization core, please refer to FIG. 6 , the preparation method of the atomization core includes the following steps.

S21: preparing a porous sheet green body, and manufacturing a heating circuit on the porous sheet green body.

Specifically, the raw materials used to form the porous sheet green body 1011 are made into a first slurry to form a flake-shaped porous sheet green body 1011 through a casting process. Specifically, the tape casting process refers to placing a fluid slurry on a bearing plane to form a thin sheet with a uniform thickness by means of scraping or rolling; the first slurry is made into a porous sheet green body through the casting process 1011 , the thickness of the porous sheet green body 1011 is 0.075 mm to 0.5 mm; the heating circuit 128 is printed on the porous sheet green body 1011 (please refer to FIG. 7( a )).

Wherein, the raw material for forming the porous sheet green body 1011 includes a first powder and a first solvent, the first powder includes ceramic powder, a first sintering aid and a pore-forming agent, and the first sintering aid occupies the first powder The mass percentage of the ceramic powder is 20% to 70%, the pore forming agent accounts for 40% to 150% of the mass of the ceramic powder in the first powder, and the first solvent includes a solvent, a dispersant, a binder and a plasticizer, The mass percentage of the binder is 8-15% of the first powder, the mass percentage of the dispersant is 0.3-3% of the first powder, and the mass ratio of the plasticizer to the binder is 0.5-0.6 .

In a specific embodiment, the ceramic powder forming the porous sheet green body 1011 includes one or more of silicon dioxide, aluminum oxide, silicon carbide, silicon nitride, diatomaceous earth, and hydroxyapatite; The agent includes one or more of anhydrous sodium carbonate, anhydrous potassium carbonate, albite, potassium feldspar, clay, bentonite, and glass powder; the pore-forming agent includes wood chips, floating beads, graphite powder, starch, flour, At least one of walnut powder, polystyrene balls and polymethyl methacrylate balls. The binder includes one or more of polyvinyl acetate, polyvinyl acetal, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, perchlorethylene resin, polyacrylate, polyamide, polysulfone kind.

Wherein, the preparation of the heating circuit 128 can also be made by any method in sputtering, vapor deposition, silk screen printing, coating, and inkjet printing, and the heating circuit 128 can also be prepared by other methods, as long as the required The heating circuit 128 gets final product. Electrodes 151 can also be formed at both ends of the heating line 128 by the above method.

S22: winding the porous sheet green body on the mold to form a prefabricated inner tube; wherein, the heating circuit is arranged on the inner surface of the prefabricated inner tube.

Specifically, the porous sheet green body 1011 obtained above is wound on the mold 50 to form a prefabricated inner tube 101 (see FIG. 7( b )). Wherein, the mold 50 is an annular cylindrical structure, and the mold 50 includes an outer tube 52 and an inner ring 51 sleeved inside the outer ring 52 . The porous sheet green body 1011 is wound on the inner ring 51 of the ring mold 50 , so that one side of the porous sheet green body 1011 printed with the heating circuit 128 is close to the inner ring 51 of the ring mold 50 . Wherein, the inner ring 51 may be a hollow structure or a solid structure. In this embodiment, the inner ring 51 has a truncated cone structure, and the outer surface of the outer ring 52 has a columnar structure. Specifically, the inner ring 51 is a pyramid-shaped truss, and may also be a conical truss. The outer ring 52 can be a prism; it can also be a cylinder. Wherein, the distance between the inner ring 51 and the outer ring 52 in the same plane decreases gradually from the first end to the second end of the annular columnar structure.

S23: forming a prefabricated outer layer pipe on the outer surface of the prefabricated inner layer pipe.

Specifically, the outer surface of the prefabricated inner layer pipe 101 is injected with a layer of second slurry with a relatively low thermal conductivity that matches the shrinkage and thermal expansion coefficient of the prefabricated inner layer pipe 101, so that the outer wall of the prefabricated inner layer pipe 101 is formed by the injection molding process. Outer tube 102. Wherein, the raw material used to form the prefabricated outer layer tube 102 is made into a second slurry; the second slurry is injected into the side of the prefabricated inner layer tube 101 away from the heating line 128, and the inner wall of the prefabricated outer layer tube 102 is in contact with the prefabricated inner layer The outer wall of the layer tube 101 is in close contact, and the thickness of the prefabricated outer layer tube 102 is 0.2 mm to 3.0 mm (see FIG. 7( c )).

The raw materials for forming the prefabricated outer tube 102 include a second powder and a skeleton aid, the second powder includes ceramic powder, a second sintering aid and a pore-forming agent, and the second sintering aid accounts for the mass of the ceramic powder in the second powder The percentage of the ceramic powder is 20% to 75%, the percentage of the pore-forming agent to the mass of the ceramic powder in the second powder is 20% to 80%, and the percentage of the second powder to the sum of the mass of the second powder and the skeleton additive is 55%. ~80%, skeleton additives include skeleton fillers, surfactants, plasticizers, and mold release agents, skeleton fillers account for 80% to 90% of the mass of skeleton assistants, and surfactants account for 10% of the mass of skeleton assistants The percentage is 1% to 5%, the plasticizer accounts for 1% to 12% of the mass of the skeleton auxiliary agent, and the percentage of the release agent to the mass of the skeleton auxiliary agent is 0.5% to 3%.

Skeleton forming agents include paraffin, microcrystalline paraffin, vegetable oil, polyethylene, polypropylene, random polypropylene, polystyrene, polymethacrylate, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer one or several.

In a specific embodiment, the ceramic powder forming the prefabricated outer tube 102 includes one or more of silicon dioxide, silicon powder, quartz sand, mullite, kaolin or cordierite.

S24: removing the mold, and sintering the prefabricated outer tube, the prefabricated inner tube and the heating circuit as a whole.

Specifically, the prefabricated outer tube 102 , the prefabricated inner tube 101 and the heating circuit 128 placed in the mold 50 are placed under normal pressure as a whole; the mold 50 is pulled out along the axial direction of the prefabricated inner tube 101 . Specifically, the mold 50 is withdrawn along the axial direction of the small hole of the conical truncated truncated hole formed by the prefabricated inner layer tube 101 toward the large hole, so that the inner cavity of the prefabricated inner layer tube 101 forms the atomization chamber 30 of the conical truncated structure .

In a specific embodiment, the material of the heating circuit 128 may be silver, silver palladium, silver platinum, or any one of gold and platinum. Since the material of the heating circuit 128 has good heat resistance, it can be co-fired with the prefabricated inner tube 101 and the prefabricated outer tube 102 at a temperature of 700° C. to 1100° C.

Under the conditions of air atmosphere, vacuum atmosphere or nitrogen atmosphere, the prefabricated outer tube 102, the prefabricated inner tube 101 and the heating circuit 128 are sintered under normal pressure at 700°C-1100°C. The prefabricated inner tube 101 is sintered to form the inner tube 124, and the preset outer tube 102 is sintered to form the outer tube 122. The inner wall of the outer tube 122 is in close contact with the outer wall of the inner tube 124 (see FIG. 7(d) ). The longitudinal section of the atomization chamber 126 formed by the inner tube 124 is a frustum of cone, and the outer tube 122 is a columnar structure. Wherein, the thermal conductivity of the inner tube 124 is greater than the thermal conductivity of the outer tube 122 .

After the sintering is completed, lead out the two electrodes of the heating element from the end of the atomization chamber away from the gas outlet channel, so that the heating element can be connected to the power supply through the electrodes.

The preparation method of the atomizing core provided in this embodiment is to form a heating circuit on the porous sheet green body and wind it to form a prefabricated inner tube, and form a prefabricated outer tube on the periphery of the prefabricated inner tube. The prefabricated inner tube and the prefabricated outer tube formed on the outside are sintered as a whole, which reduces the processing difficulty of making heating circuits on the inner wall of the prefabricated inner tube, simplifies the processing technology of the atomizing core, and saves manufacturing costs. In addition, the thermal conductivity of the inner tube in the manufactured atomizing core is greater than that of the outer tube, so that the inner tube can quickly disperse the heat on the inner wall of the atomizing chamber, and prevent the inner wall of the atomizing chamber from being overheated. The problem of dry burning, and the heat in the inner tube can further heat and atomize the substrate to be atomized, thereby increasing the content of aerosol and improving the satisfaction of users.

The above is only the implementation of the application, and does not limit the scope of patent protection of the application. Any equivalent structure or equivalent process conversion made by using the description and drawings of the application, or directly or indirectly used in other related technical fields , are all included in the patent protection scope of the present application in the same way.

Claims

An atomizing core, wherein the atomizing core includes:

Tubular porous matrix, forming an atomization chamber inside;

A heating element, the heating element is arranged on the inner wall of the atomization chamber, and the heating element is used to heat and atomize the substrate to be atomized introduced into the tubular porous substrate;

Wherein, the tubular porous matrix includes an inner tube and an outer tube sleeved outside the inner tube, the outer surface of the inner tube is in close contact with the inner surface of the outer tube, and the heating element It is arranged on the inner surface of the inner tube, and the thermal conductivity of the inner tube is greater than that of the outer tube.
The atomizing core according to claim 1, wherein the difference between the thermal conductivity of the inner tube and the outer tube is greater than 0.8W/(m·K).
The atomizing core according to claim 2, wherein the thermal conductivity of the inner tube is 1W/(m.K)~10W/(m.K), and the thermal conductivity of the outer tube is 0.2W/(m.K)~ 2W/(m.K).
The atomizing core according to claim 1, wherein the porosity of the inner tube is 40-75%, and the porosity of the outer tube is 30-70%.
The atomizing core according to claim 1, wherein the micropore diameter of the inner tube is 20 microns to 100 microns, and the micropore diameter of the outer tube is 10 microns to 100 microns.
The atomizing core according to claim 1, wherein the heat flux of the heating element is 0.8W/mm 3 -2W/mm 3 .
The atomizing core according to claim 1, wherein the longitudinal section of the atomizing chamber is quadrilateral.
The atomizing core according to claim 7, wherein the quadrilateral is a rectangle or a trapezoid.
The atomizing core according to claim 8, wherein the angle formed by the side and the bottom of the trapezoid is larger than 60° and smaller than 90°.
The atomizing core according to claim 9, wherein the tubular porous base is a hollow cylinder, and the shape of the atomizing chamber is a conical frustum.
The atomizing core according to claim 10, wherein the outer diameter of the hollow cylinder is 2.5mm-10mm.
The atomizing core according to claim 10, wherein the tube wall thickness of the inner layer tube is uniform, and the tube wall thickness of the outer layer tube is along the line from the top surface of the conical pedestal to the conical pedestal The direction of the bottom surface gradually decreases.
A nebulizer, comprising:

The housing has a liquid storage chamber for storing the substance to be atomized;

The atomizing core is arranged in the housing; wherein, the atomizing core is the atomizing core according to claim 1, and the substance to be atomized in the liquid storage chamber is transferred to the Atomization chamber.
An electronic atomization device, including:

Atomizer; the atomizer is the atomizer according to claim 13;

The power supply component is used for supplying power to the atomizer and controlling the operation of the atomizer.
A method for preparing an atomizing core, wherein the method for preparing the atomizing core includes:

Prepare a porous sheet green body, and make a heating circuit on the porous sheet green body;

Winding the porous sheet green body on a mold to form a prefabricated inner tube; wherein, the heating circuit is arranged on the inner surface of the prefabricated inner tube;

forming a prefabricated outer tube on the outer surface of the prefabricated inner tube;

removing the mold, and sintering the prefabricated outer tube, the prefabricated inner tube and the heating circuit as a whole;

Wherein, the thermal conductivity of the prefabricated inner tube after sintering is greater than the thermal conductivity of the prefabricated outer tube after sintering.
The method for preparing an atomizing core according to claim 15, wherein the raw material for forming the porous sheet green body includes a first powder and a first solvent, and the first powder includes ceramic powder, a first sintering aid agent and pore forming agent, the percentage of the first sintering aid in the mass of the ceramic powder is 20% to 70%, the percentage of the pore forming agent in the mass of the ceramic powder is 40% to 150%, and the The first solvent includes solvent, dispersant, binder and plasticizer, the mass percent of the binder is 8-15% of the first powder, the mass percent of the dispersant is the first 0.3%-3% of the powder, and the mass ratio of the plasticizer to the binder is 0.5-0.6.
The method for preparing an atomizing core according to claim 16, wherein the first powder comprises at least one of silicon dioxide, aluminum oxide, silicon carbide, silicon nitride, diatomaceous earth, and hydroxyapatite .
The method for preparing an atomizing core according to claim 15, wherein the raw material for forming the prefabricated outer layer tube includes a second powder and a skeleton aid, and the second powder includes ceramic powder and a second sintering aid and a pore forming agent, the percentage of the second sintering aid in the mass of the ceramic powder is 20% to 75%, the percentage of the pore forming agent in the mass of the ceramic powder is 20% to 80%, the first The percentage of the second powder to the total mass of the second powder and the skeleton auxiliary agent is 55% to 80%, and the skeleton auxiliary agent includes a skeleton filler, a surfactant, a plasticizer, and a mold release agent. The percentage of the skeleton filler in the weight of the skeleton auxiliary agent is 80% to 90%, the percentage of the surfactant in the weight of the skeleton auxiliary agent is 1% to 5%, and the plasticizer accounts for the weight of the skeleton auxiliary agent. The mass percentage of the auxiliary agent is 1%-12%, and the percentage of the release agent in the skeleton auxiliary agent is 0.5%-3%.
The method for preparing an atomizing core according to claim 18, wherein the second powder comprises at least one of silicon dioxide, silicon powder, quartz sand, mullite, kaolin or cordierite.