Patent Publication Number: US-2022225679-A1

Title: Vaporization core, electronic vaporization device, and method for manufacturing the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2021/106595, filed Jul. 15, 2021, which claims the benefit of priority to Chinese Application No. CN202010803551.7, filed Aug. 11, 2020. All of the disclosures of the afore-mentioned patent applications are hereby incorporated by references in their entireties 
    
    
     TECHNICAL FIELD 
     This application relates to the field of electronic vaporizer technologies, and in particular, to an electronic vaporization device, a vaporization core, and a method for manufacturing a vaporization core. 
     BACKGROUND 
     Currently, most ceramic vaporization cores in electronic vaporization devices adopt a structure configuration of integrated liquid guiding and heating, where a heating element generally includes a heating wire and a heating film. A ceramic vaporization core product of a heating wire type can achieve effects of a short air passage, a simple structure, and high vaporization efficiency. However, most heating wires of the product are located inside a ceramic substrate, and only few heating wires are partially exposed or not exposed at all, which greatly reduces thermal efficiency of the product. A ceramic vaporization core product of a heating film type can achieve effects of surface vaporization and high thermal efficiency. However, an air passage of the product generally has turns and is relatively long, which greatly reduces a hot feeling of a user when smoking aerosols and results in low vapor generating efficiency. However, ceramic vaporization core products generally cannot have both of the advantages, and as a result, cannot completely meet users&#39; requirements on content and taste of aerosols. On the other hand, many existing vaporization core products require high-temperature sintering (a sintering temperature is higher than 1100 degrees Celsius) in a protective atmosphere, and some products may be even sintered under high temperature repeatedly, resulting in a complex process and high production costs. 
     SUMMARY 
     This application provides a method for manufacturing a vaporization core, a vaporization core, and an electronic vaporization device, to resolve the problems of a complex manufacturing process and high costs of a vaporization core in existing technologies. 
     To resolve the foregoing technical problems, a first technical solution of this application is to provide a method for manufacturing a vaporization core, including: fabricating a porous lamellar green compact, and fabricating a heating circuit on the porous lamellar green compact; winding the porous lamellar green compact on a mould to form an inner tube, where the heating circuit is disposed on an inner wall of the inner tube; forming an outer tube on an outer wall of the inner tube; and removing the mould, and sintering the outer tube, the inner tube, and the heating circuit. 
     The step of removing the mould, and sintering the outer tube, the inner tube, and the heating circuit specifically includes: resting the outer tube, the inner tube, and the heating circuit in the mould under normal pressure; removing the mould along an axial direction of the inner tube; and performing normal-pressure sintering on the outer tube, the inner tube, and the heating circuit at 700 degrees Celsius to 1000 degrees Celsius in air atmosphere. 
     The step of fabricating a porous lamellar green compact, and fabricating a heating circuit on the porous lamellar green compact specifically includes: manufacturing raw materials for forming the porous lamellar green compact into a first slurry; manufacturing the first slurry into the porous lamellar green compact through a casting process, where a thickness of the porous lamellar green compact is 0.075 millimeters to 0.5 millimeters; and manufacturing the heating circuit on the porous lamellar green compact through screen printing. 
     The step of forming an outer tube on an outer wall of the inner tube specifically includes: manufacturing raw materials for forming the outer tube into a second slurry; and injecting the second slurry into a side of the inner tube away from the heating circuit, where an inner wall of the outer tube tightly fits the outer wall of the inner tube, and a thickness of the outer tube is 0.2 millimeters to 3.0 millimeters. 
     The raw materials forming the porous lamellar green compact include a first powder and a first solvent; the first powder includes a ceramic powder, a first sintering additive, and a pore-forming agent; a mass percentage of the first sintering additive in the first powder is 1% to 40%, and a mass percentage of the pore-forming agent is not greater than two times of total mass of the ceramic powder and the first sintering additive. The first solvent includes one or more of a dispersant, an adhesive, a plasticizer, and a coupling agent, and a mass percentage of the adhesive is 1% to 40% of the first powder. 
     The raw materials forming the outer tube include a second powder and a second solvent; the second powder includes a ceramic powder, a second sintering additive, and a pore-forming agent; a mass percentage of the second sintering additive is 2% to 40% of total mass of the second power; a mass percentage of the pore-forming agent is 5% to 80% of the total mass of the second powder; the second sintering additive includes a framework-forming agent, and a mass percentage of the framework-forming agent is 5% to 150% of the total mass of the second powder. 
     The raw materials forming the outer tube include a second powder and a second solvent; the second powder includes a ceramic powder, a second sintering additive, and a pore-forming agent; a mass percentage of the second sintering additive is 2% to 40% of total mass of the second power; a mass percentage of the pore-forming agent is 5% to 80% of the total mass of the second powder; the second sintering additive includes an organic monomer, and a mass percentage of the organic monomer is 0.1% to 20% of the total mass of the second powder. 
     To resolve the foregoing technical problems, a second technical solution of this application is to provide a vaporization core, including: a tubular porous substrate, forming a vaporization cavity and configured to guide liquid outside the tubular porous substrate into the vaporization cavity; and a heating element, disposed on an inner wall of the tubular porous substrate and configured to heat and vaporize the liquid guided into the vaporization cavity. 
     The tubular porous substrate includes an inner tube and an outer tube, the outer tube is sleeved on the inner tube, an outer wall of the inner tube tightly fits an inner wall of the outer tube, and the vaporization cavity is formed inside the inner tube; and the heating element is disposed on an inner wall of the inner tube. 
     Materials of the tubular porous substrate include porous ceramics, the porous ceramics has a porosity of 30% to 80% and a pore size of 10 micrometers to 150 micrometers. 
     The heating element includes a heating film; and the heating film includes at least one of the following metal components: platinum, gold, silver, silver-palladium, or silver-platinum. 
     A wall thickness of the inner tube is 0.075 millimeters to 0.5 millimeters; and a wall thickness of the outer tube is 0.2 millimeters to 3.0 millimeters. 
     To resolve the foregoing technical problems, a third technical solution of this application is to provide an electronic vaporization device, including: a liquid storage cavity configured to store a vaporization medium and the vaporization core described above, where the vaporization medium in the liquid storage cavity is capable of being transmitted to the vaporization cavity through the tubular porous substrate. 
     Beneficial effects of this application are as follows: different from the existing technologies, this application provides a method for manufacturing a vaporization core, a vaporization core, and an electronic vaporization device. The manufacturing method includes: manufacturing a heating circuit on a prepared porous lamellar green compact; winding the porous lamellar green compact on a mould to form an inner tube, where the heating circuit is disposed on an inner wall of the inner tube; forming an outer tube on a side of the inner tube away from the heating circuit; and removing the mould, and sintering the outer tube, the inner tube, and the heating circuit. According to the method for manufacturing a vaporization core provided in this application, a heating circuit is formed on a porous lamellar green compact and an inner tube is formed through winding; an outer tube is formed on the peripheral of the inner tube; the inner tube having the heating circuit and the outer tube formed on an outer side are sintered, thereby reducing the processing difficulty of manufacturing the heating circuit on an inner wall of the inner tube, simplifying the processing of the vaporization core, and reducing manufacturing costs. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic flowchart of an embodiment of a method for manufacturing a vaporization core according to this application; 
         FIG. 2( a )  is a schematic structural diagram corresponding to step S 11  of the method for manufacturing a vaporization core in  FIG. 1 ; 
         FIG. 2( b )  is a schematic structural diagram corresponding to step S 12  of the method for manufacturing a vaporization core in  FIG. 1 ; 
         FIG. 2( c )  is a schematic structural diagram corresponding to step S 13  of the method for manufacturing a vaporization core in  FIG. 1 ; 
         FIG. 2( d )  is a schematic structural diagram corresponding to step S 14  of the method for manufacturing a vaporization core in  FIG. 1 ; 
         FIG. 3  is a schematic flowchart of another embodiment of a method for manufacturing a vaporization core according to this application; 
         FIG. 4  is a schematic structural diagram of an embodiment of a vaporization core according to this application; 
         FIG. 5  is a top view of the vaporization core in  FIG. 4 ; and 
         FIG. 6  is a schematic structural diagram of an embodiment of an electronic vaporization device according to this application. 
     
    
    
     DETAILED DESCRIPTION 
     Technical solutions of embodiments of this application are described in detail below with reference to the accompanying drawings of this specification. 
     In the following description, for the purpose of illustration rather than limitation, specific details such as the specific system structure, interface, and technology are proposed for a thorough understanding of this application. 
     The technical solutions in the embodiments of this application are clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are merely some rather than all of the embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the protection scope of this application. 
     In this application, the terms “first”, “second”, and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined by “first”, “second”, and “third” can explicitly or implicitly include at least one of the features. In the description of this application, “more” means at least two, such as two and three unless it is specifically defined otherwise. All directional indications (for example, up, down, left, right, front, and rear) in the embodiments of this application are only used for explaining relative position relationships, movement situations or the like between the various components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications change accordingly. In addition, the terms “include”, “have”, and any variant thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but further optionally includes a step or unit that is not listed, or further optionally includes another step or unit that is intrinsic to the process, method, product, or device. 
     Embodiment mentioned in the specification means that particular features, structures, or characteristics described with reference to the embodiment may be included in at least one embodiment of this application. The term appearing at different positions of this specification may not refer to the same embodiment or an independent or alternative embodiment that is mutually exclusive with another embodiment. A person skilled in the art explicitly or implicitly understands that the embodiments described in the specification may be combined with other embodiments. 
     Referring to  FIG. 1  and  FIG. 2 ,  FIG. 1  is a schematic flowchart of an embodiment of a method for manufacturing a vaporization core according to this application;  FIG. 2( a )  is a schematic structural diagram corresponding to step S 11  of the method for manufacturing a vaporization core in  FIG. 1 ;  FIG. 2( b )  is a schematic structural diagram corresponding to step S 12  of the method for manufacturing a vaporization core in  FIG. 1 ;  FIG. 2( c )  is a schematic structural diagram corresponding to step S 13  of the method for manufacturing a vaporization core in  FIG. 1 ; and  FIG. 2( d )  is a schematic structural diagram corresponding to step S 14  of the method for manufacturing a vaporization core in  FIG. 1 . In this embodiment, the method for manufacturing a vaporization core  100  includes the following steps. 
     S 11 : Fabricate a porous lamellar green compact, and fabricate a heating circuit on the porous lamellar green compact. 
     Specifically, raw materials for forming a porous lamellar green compact  1011  are manufactured into a first slurry, and the sheet-like porous lamellar green compact  1011  is then formed through a casting process. Specifically, the casting process means placing a fluid slurry on a carrying plane, and forming a sheet with uniform thickness through scraping or rolling. The first slurry is manufactured into the porous lamellar green compact  1011  through the casting process, and a thickness of the porous lamellar green compact  1011  is 0.075 millimeters to 0.5 millimeters. A heating circuit  20  is printed on the porous lamellar green compact  1011  (referring to  FIG. 2( a ) ). The raw materials forming the porous lamellar green compact  1011  include a first powder and a first solvent; the first powder includes a ceramic powder, a first sintering additive, and a pore-forming agent; a mass percentage of the first sintering additive in the first powder is 1% to 40%, and a mass percentage of the pore-forming agent is less than or equal to two times of total mass of the ceramic powder and the first sintering additive; the first solvent includes one or more of a dispersant, an adhesive, a plasticizer, and a coupling agent, and a mass percentage of the adhesive is 1% to 40% of the first powder. 
     S 12 : Wind the porous lamellar green compact on a mould to form an inner tube, where the heating circuit is disposed on an inner wall of the inner tube. 
     Specifically, the obtained porous lamellar green compact  1011  is wound on a mould  50  to form an inner tube  101  (referring to  FIG. 2( c ) ). The mould  50  is an annular cylinder structure, and the porous lamellar green compact  1011  is wound on an inner ring of the annular mould  50 , so that one side of the porous lamellar green compact  1011  on which the heating circuit  20  is printed tightly fits the inner ring of the annular mould  50 . The inner ring may be a hollow structure or may be a solid structure. 
     S 13 : Form an outer tube on an outer wall of the inner tube. 
     Specifically, the outer tube is formed on the outer wall of the inner tube through injection moulding. Raw materials for forming the outer tube  102  are manufactured into a second slurry. The second slurry is injected into a side of the inner tube  101  away from the heating circuit  20 , an inner wall of the outer tube  102  tightly fits an outer wall of the inner tube  101 , and a thickness of the outer tube  102  is 0.2 millimeters to 3.0 millimeters (referring to  FIG. 2( c ) ). The raw materials forming the outer tube  102  include a second powder and a second solvent; the second powder includes a ceramic powder, a second sintering additive, and a pore-forming agent; a mass percentage of the second sintering additive is 2% to 40% of total mass of the second power; a mass percentage of the pore-forming agent is 5% to 80% of the total mass of the second powder; the second sintering additive includes a framework-forming agent, and a mass percentage of the framework-forming agent is 5% to 150% of the total mass of the second powder. In an optional embodiment, the raw materials forming the outer tube  102  include a second powder and a second solvent; the second powder includes a ceramic powder, a second sintering additive, and a pore-forming agent; a mass percentage of the second sintering additive is 2% to 40% of total mass of the second power; a mass percentage of the pore-forming agent is 5% to 80% of the total mass of the second powder; the second sintering additive includes an organic monomer, and a mass percentage of the organic monomer is 0.1% to 20% of the total mass of the second powder. 
     S 14 : Remove the mould, and sinter the outer tube, the inner tube, and the heating circuit. 
     Specifically, the outer tube  102 , the inner tube  101 , and the heating circuit  20  in the mould  50  are rested under normal pressure; the mould  50  is removed along an axial direction of the inner tube  101  (referring to  FIG. 2( d ) ); and an inner cavity of the inner tube  101  forms a vaporization cavity  30 . Normal-pressure sintering is performed on the outer tube  102 , the inner tube  101 , and the heating circuit  20  at 700 degrees Celsius to 1000 degrees Celsius in air atmosphere. 
     According to the method for manufacturing a vaporization core provided in this embodiment, a heating circuit is formed on a porous lamellar green compact and an inner tube is formed through winding; an outer tube is formed on the peripheral of the inner tube; the inner tube having the heating circuit and the outer tube formed on an outer side are sintered, thereby reducing the processing difficulty of manufacturing the heating circuit on an inner wall of the inner tube, simplifying the processing of the vaporization core, and reducing manufacturing costs. 
     Referring to  FIG. 3 ,  FIG. 3  is a schematic flowchart of another embodiment of a method for manufacturing a vaporization core according to this application. In this embodiment, the method for manufacturing a vaporization core includes the following steps. 
     S 21 : Manufacture raw materials for forming a porous lamellar green compact into a first slurry. 
     Specifically, raw materials forming the porous lamellar green compact are prepared, and the prepared raw materials are mixed uniformly to manufacture a first slurry. The raw materials forming the porous lamellar green compact include a first powder and a first solvent; the first powder includes a ceramic powder, a first sintering additive, and a pore-forming agent; a mass percentage of the first sintering additive in the first powder is 1% to 40%, and a mass percentage of the pore-forming agent is not greater than two times of total mass of the ceramic powder and the first sintering additive; the first solvent includes at least one of a dispersant, an adhesive, a plasticizer, or a coupling agent, and a mass percentage of the adhesive is 1% to 40% of the first powder. Mass percentages of the first sintering additive, the pore-forming agent, and the adhesive may be determined according to a sintering shrinkage ratio of the required inner tube. 
     In a specific embodiment, the ceramic powder includes one or more of silicon dioxide, quartz sand, diatomite, alumina, magnesium oxide, kaolin, mullite, and cordierite; the sintering additive includes one or more of anhydrous sodium carbonate, anhydrous potassium carbonate, albite, potash feldspar, clay, bloating clay, and glass powder; and the pore-forming agent includes at least one of sawdust, cenosphere, graphite powder, amylum, flour, walnut powder, polystyrene spheres, or polymethylmethacrylate spheres. The adhesive includes one or more of polyvinyl acetate, polyvinyl acetal, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, perchlorovinyl resin, polyacrylate, polyamide, and polysulfone. The framework-forming agent includes one or more of paraffin, microcrystalline paraffin, vegetable oil, polyethylene, polypropylene, atactic polypropylene, polystyrene, polymethylmethacrylate, ethylene-vinyl acetate copolymer, and ethylene-ethyl acrylate copolymer. The organic monomer includes one or more of agar, agarose, gelatin, pectin, chitosan, protein, sodium alginate, acrylamide, alkyl methacrylate, allyl methacrylate, propyl methacrylate, and methyl methacrylate. 
     S 22 : Manufacture the first slurry into the porous lamellar green compact through a casting process. 
     Specifically, the manufactured first slurry is manufactured into the porous lamellar green compact through a casting process, namely, a porous lamellar sheet is formed. In an optional embodiment, the manufactured first slurry may be alternatively manufactured into the porous lamellar green compact through film rolling. A thickness of the porous lamellar green compact may be 0.075 millimeters to 0.5 millimeters. 
     S 23 : Manufacture a heating circuit on the porous lamellar green compact through screen printing. 
     Specifically, a heating circuit is printed on a side surface of the porous lamellar green compact. In a specific embodiment, materials of the heating circuit may be silver, silver-palladium, or silver-platinum, or may be any one of gold or platinum. The materials of the heating circuit have good heat resistance, so that the heating circuit may be sintered together with the inner tube and the outer tube at 700 degrees Celsius to 1000 degrees Celsius. Preparation of the heating circuit may be alternatively implemented through any one of sputtering, evaporation, screen printing, coating, and inkjet printing, and the heating circuit may be alternatively manufactured in other manners, provided that a heating circuit meeting requirements can be manufactured. 
     S 24 : Wind the porous lamellar green compact on a mould to form an inner tube. 
     Specifically, the porous lamellar green compact on which the heating circuit is printed is wound on a mould to form an inner tube. The porous lamellar green compact surrounds an inner ring of the mould to form a hollow tubular structure, namely, form the inner tube. One side on which the heating circuit is printed of the porous lamellar green compact tightly fits the inner ring structure. 
     S 25 : Manufacture raw materials for forming a outer tube into a second slurry. 
     Specifically, the raw materials forming the outer tube are prepared, and the prepared raw materials forming the outer tube are mixed uniformly to form the second slurry according to a preset ratio; and the second slurry is injected into a side of the inner tube away from the heating circuit, an inner wall of the outer tube tightly fits an outer wall of the inner tube, and a thickness of the outer tube is 0.2 millimeters to 3.0 millimeters. The raw materials of the second slurry include a second powder and a second solvent; the second powder includes a ceramic powder, a second sintering additive, and a pore-forming agent; a mass percentage of the second sintering additive is 2% to 40% of total mass of the second power; a mass percentage of the pore-forming agent is 5% to 80% of the total mass of the second powder; the second sintering additive includes a framework-forming agent, and a mass percentage of the framework-forming agent is 5% to 150% of the total mass of the second powder. The second sintering additive further includes a surface active agent, a plasticizer, and a coupling agent. Mass percentages of the second sintering additive, the pore-forming agent, and the framework-forming agent may be determined according to a sintering shrinkage ratio of the required outer tube. 
     In another optional embodiment, the raw materials of the second slurry include a second powder and a second solvent; the second powder includes a ceramic powder, a second sintering additive, and a pore-forming agent; a mass percentage of the second sintering additive is 2% to 40% of total mass of the second power; a mass percentage of the pore-forming agent is 5% to 80% of the total mass of the second powder; the second sintering additive includes an organic monomer, and a mass percentage of the organic monomer is 0.1% to 20% of the total mass of the second powder. The second sintering additive further includes deionized water, a crosslinking agent, an initiating agent, a dispersant, and a PH regulator. Mass percentages of the second sintering additive, the pore-forming agent, and the organic monomer may be determined according to a sintering shrinkage ratio of the required outer tube. 
     In a specific embodiment, the ceramic powder includes one or more of silicon dioxide, quartz sand, diatomite, alumina, magnesium oxide, kaolin, mullite, and cordierite; the sintering additive includes one or more of anhydrous sodium carbonate, anhydrous potassium carbonate, albite, potash feldspar, clay, bloating clay, and glass powder; and the pore-forming agent includes at least one of sawdust, cenosphere, graphite powder, amylum, flour, walnut powder, polystyrene spheres, or polymethylmethacrylate spheres. The adhesive includes one or more of polyvinyl acetate, polyvinyl acetal, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, perchlorovinyl resin, polyacrylate, polyamide, and polysulfone. The framework-forming agent includes one or more of paraffin, microcrystalline paraffin, vegetable oil, polyethylene, polypropylene, atactic polypropylene, polystyrene, polymethylmethacrylate, ethylene-vinyl acetate copolymer, and ethylene-ethyl acrylate copolymer. The organic monomer includes one or more of agar, agarose, gelatin, pectin, chitosan, protein, sodium alginate, acrylamide, alkyl methacrylate, allyl methacrylate, propyl methacrylate, and methyl methacrylate. 
     In another optional embodiment, the sintering shrinkage ratio of the inner tube is close to the sintering shrinkage ratio of the outer tube. In a preferred embodiment, the sintering shrinkage ratio of the inner tube is the same as the sintering shrinkage ratio of the outer tube. 
     S 26 : Inject the second slurry into a side of the inner tube away from the heating circuit to form the outer tube. 
     Specifically, the second slurry is injected into a side of the inner tube away from the heating circuit to form the outer tube, the inner wall of the outer tube tightly fits the outer wall of the inner tube, and the thickness of the outer tube is 0.2 millimeters to 3.0 millimeters. 
     S 27 : Remove the mould, and sintering the outer tube, the inner tube, and the heating circuit. 
     Specifically, the outer tube, the inner tube, and the heating circuit in the mould are rested under normal pressure; the mould is removed along an axial direction of the inner tube; and normal-pressure sintering is performed on the outer tube, the inner tube, and the heating circuit at 700 degrees Celsius to 1000 degrees Celsius in air atmosphere. In a specific embodiment, after the operation of forming the outer tube by using the second slurry is completed, the mould is removed after the entire structure is rested under normal pressure for 15 minutes; the structure is reserved, and normal-pressure sintering is performed on the outer tube, the inner tube, and the heating circuit at a sintering temperature of 700 degrees Celsius to 1000 degrees Celsius in the air. After the sintering is completed, two electrodes of the heating element are led out from an end of the vaporization cavity away from a communication air outlet channel, for the heating element to be connected to a power supply through the electrodes. 
     The method for manufacturing a vaporization core provided in this embodiment includes: printing a heating circuit on a prepared porous lamellar green compact; winding the porous lamellar green compact on a mould to form an inner tube, to cause the heating circuit to be close to the mould; forming an outer tube on a side of the inner tube away from the heating circuit through injection moulding; and removing the mould, and performing normal-pressure sintering on the outer tube, the inner tube, and the heating circuit to obtain a vaporization core. A heating circuit is formed on a porous lamellar green compact and an inner tube is formed through winding; an outer tube is formed on the peripheral of the inner tube; the inner tube having the heating circuit and the outer tube formed on an outer side are sintered, thereby reducing the processing difficulty of manufacturing the heating circuit on an inner wall of the inner tube, simplifying the processing of the vaporization core, and reducing manufacturing costs. 
     Referring to  FIG. 4  and  FIG. 5 ,  FIG. 4  is a schematic structural diagram of an embodiment of a vaporization core according to this application.  FIG. 5  is a top view of the vaporization core in  FIG. 4 . In this embodiment, a vaporization core  100  is provided, and the vaporization core  100  includes a tubular porous substrate  10  and a heating element  20 . 
     The tubular porous substrate  10  forms a vaporization cavity  30 , and the tubular porous substrate  10  is configured to guide liquid outside the tubular porous substrate  10  into the vaporization cavity  30 . The vaporization cavity  30  is in communication with an air outlet channel of a nozzle. In an optional embodiment, the tubular porous substrate  10  includes an inner tube  101  and an outer tube  102 , the outer tube  102  is sleeved on the inner tube  101 , an outer wall of the inner tube  101  tightly fits an inner wall of the outer tube  102 , and the vaporization cavity  30  is formed inside the inner tube  101 ; and the heating element  20  is disposed on an inner wall of the inner tube  101 . A wall thickness of the inner tube  101  is 0.075 millimeters to 0.5 millimeters. A wall thickness of the inner tube  102  is 0.2 millimeters to 3.0 millimeters. In a specific embodiment, materials of the tubular porous substrate  10  include porous ceramics, and the porous ceramics has a porosity of 30% to 80% and a pore size of 10 micrometers to 150 micrometers. In an optional embodiment, a pore size on the inner tube  101  is less than a pore size on the outer tube  102 , so that a flow speed of liquid guided into the vaporization cavity  30  may be further adjusted, to prevent an excessively high speed of the guided liquid from affecting a vaporization effect. In a specific embodiment, the inner tube  101  and the outer tube  102  have similar ceramic components, and similar shrinkage ratios of the materials, so that the inner tube and the outer tube can match with each other, and the inner tube  101  and the outer tube  102  can be attached to each other after sintering to form an integral structure. 
     The heating element  20  is disposed on an inner wall of the tubular porous substrate  10 , and the heating element  20  is configured to heat and vaporize the liquid guided into the vaporization cavity  30 . In a specific embodiment, the heating element  20  includes a heating circuit arranged in an S shape, or a heating circuit arranged in a ring shape. The heating element  20  includes a heating film; and the heating film includes at least one of the following metal components: platinum, gold, silver, silver-palladium, or silver-platinum. The heating element  20  further includes electrodes, and the electrodes are connected to two ends of the heating circuit. The electrodes are introduced out from one end of the vaporization cavity  30  away from a communication air outlet channel. The liquid in this embodiment is a vaporization medium (oil, leaf, flower, or grass/liquid, flower, oil, or paste). 
     According to the vaporization core provided in this embodiment, the vaporization medium in a liquid storage cavity is guided into the vaporization cavity through the disposed tubular porous substrate, the vaporization medium in the vaporization cavity is then heated by the heating element, and the vaporization medium directly enters the air outlet channel from the vaporization cavity after being vaporized and then directly enters a mouth of a user. The entire air passage is short, the structure is simple, and the vaporization efficiency is high. As a result, users&#39; requirements on content and taste of aerosols can be met. 
     Referring to  FIG. 6 ,  FIG. 6  is a schematic structural diagram of an embodiment of an electronic vaporization device according to this application. This embodiment provides an electronic vaporization device  1 , and the electronic vaporization device  1  includes a liquid storage cavity  200  configured to store a vaporization medium, a vaporization core  100 , and a nozzle  400 , where the vaporization medium in the liquid storage cavity  200  is capable of being transmitted to a vaporization cavity  30  through a tubular porous substrate  10 . The structure of the vaporization core  100  is as described in the foregoing embodiment. In an optional embodiment, the vaporization cavity  30  of the vaporization core  100  is in direct communication with an air outlet channel  401  of the nozzle  400 . 
     In another specific embodiment, the vaporization core  100  includes a tubular porous substrate  10  and a heating element  20 . The tubular porous substrate  10  includes an inner tube  101  and an outer tube  102 , the outer tube  102  is sleeved on the inner tube  101 , and the inner tube  101  and the outer tube  102  may be disposed integrally. The heating element  20  includes a heating circuit  201  and electrodes  202 , and the electrodes  202  are electrically connected to two ends of the heating circuit  201 . The heating circuit  201  is disposed on an inner wall of the inner tube  101 , and the electrodes  202  are disposed inside the vaporization cavity  30 . The liquid storage cavity  200  is disposed on the periphery of the vaporization core  100 , the liquid storage cavity  200  is configured to store the vaporization medium, and the vaporization medium in the liquid storage cavity  200  is guided into the vaporization cavity  30  of the vaporization core  100  through the tubular porous substrate  10 . 
     The electronic vaporization device  1  further includes a power supply  300 . The power supply  300  may be disposed at the bottom of the vaporization core  100 , and the power supply  300  is electrically connected to the electrodes  202 ; and the nozzle  400  is disposed at the top of the vaporization core  100 , the nozzle  400  includes an air outlet channel  401 , and the air outlet channel  401  is in communication with the vaporization cavity  30  of the vaporization core  100 . 
     When using the electronic vaporization device  1 , a user turns on the power supply  300 ; the heating circuit  201  vaporizes the vaporization medium in the vaporization cavity  30 , and the vaporized vaporization medium enters the mouth of the user from the vaporization cavity  30  through the air outlet channel  401  of the nozzle  400 . The entire air passage is short, so that the user&#39;s requirements on content and taste of aerosols can be met. 
     According to the electronic vaporization device provided in this embodiment, the vaporization medium in a liquid storage cavity is guided into the vaporization cavity through the tubular porous substrate, the vaporization medium in the vaporization cavity is then heated by the heating element, and the vaporization medium directly enters the air outlet channel of the nozzle from the vaporization cavity after being vaporized and then directly enters a mouth of a user. The entire air passage is short, the structure is simple, and the vaporization efficiency is high, so that users&#39; requirements on content and taste of aerosols can be met. 
     The foregoing descriptions are merely embodiments of this application, and the protection scope of this application is not limited thereto. All equivalent structure or process changes made according to the content of this specification and accompanying drawings in this application or by directly or indirectly applying this application in other related technical fields shall fall within the protection scope of this application.