Heating element and preparation method thereof, atomizer and electronic device

Abstract

The present invention relates to a heating element and a preparation method thereof, an atomizer and an electronic device. The heating element comprises a porous ceramic body and a heating element, the porous ceramic body has a liquid guiding function, and comprises a preheating element, the preheating element is a porous infrared ceramic structure, the heating element is located on the porous ceramic body, and is used to provide heat to the preheating element and atomize the preheated liquid. The above-mentioned heating element has a good liquid guiding effect, and can improve the problem of slow smoke emission and dry burning of the heating element when atomizing tobacco oil.

Description

Technical Field

[0001] The present invention relates to the technical field of atomizers, and in particular to a heating element and a preparation method thereof, an atomizer and an electronic device. Background Art

[0002] Electronic cigarettes mainly include atomizers and batteries. Atomizers are important components of electronic cigarettes and are used to atomize the e-liquid for inhalation. In the atomizer, the heating element is the core component of the atomizer to play the atomization role. It is mainly formed by pre-embedded heating wires or silk-screen heating films on the ceramic substrate. The heating element with pre-embedded heating wires has the advantages of simple structure, high atomization efficiency, and uniform temperature field. The heating element with silk-screen heating film has the advantages of large heating area, surface atomization, and high thermal efficiency.

[0003] However, when these two types of heating elements are atomizing the e-liquid, they are prone to problems such as slow smoke output, dry burning of the heating element, and burnt smell and mixed gas, which affect the user experience. Summary of the invention

[0004] Based on this, it is necessary to provide a heating element that can improve the problems of slow smoke output and dry burning of the heating element when atomizing e-liquid.

[0005] A heating element, comprising:

[0006] A porous ceramic body having a liquid conducting function, wherein the porous ceramic body comprises a preheating element for preheating liquid, wherein the preheating element is a porous infrared ceramic structure; and

[0007] The heating element is located on the porous ceramic body and is used to provide heat to the preheating element and atomize the preheated liquid.

[0008] The above-mentioned heating element uses a porous infrared ceramic structure as a preheating element. The preheating element preheats the liquid by utilizing the heat provided by the heating element to radiate far-infrared rays, thereby reducing the viscosity of the liquid and improving the fluidity of the liquid in the porous ceramic body, so that the liquid to be atomized can reach the heating element more quickly and be atomized, thereby improving the problem of slow smoke emission caused by atomized tobacco oil. At the same time, since the fluidity of the liquid to be atomized in the porous ceramic body is improved, it can reach the heating element more quickly, thereby improving the problem of the heating element being prone to dry burning.

[0009] In one embodiment, the porous ceramic body also includes a substrate, the preheating element is located on the substrate, the substrate is a porous ceramic structure, and the heating element is completely located inside the preheating element and close to the substrate or at the junction of the substrate and the preheating element.

[0010] In one embodiment, the substrate is a hollow porous ceramic structure, the preheating element is a hollow porous infrared ceramic structure, and the substrate and the preheating element are nested with each other.

[0011] In one embodiment, the preheating element is sleeved on the base, and the heating element is distributed in a spiral shape on the base.

[0012] In one embodiment, the heating element includes a heating portion and an infrared heating layer located on the heating portion.

[0013] In one embodiment, the infrared heating layer has a thickness of 20 μm to 500 μm.

[0014] In one embodiment, the substrate is in the shape of a hollow cylinder, the preheating element is in the shape of a hollow cylinder, the preheating element is sleeved on the substrate, the inner diameter of the substrate is 5 mm to 3 mm, and the outer diameter of the preheating element is 2.5 mm to 9 mm.

[0015] In one embodiment, the surface of the base close to the preheating element is recessed to form a first groove, and the surface of the preheating element close to the base is recessed to form a second groove corresponding to the first groove. The first groove and the second groove form a heating cavity, and the heating element is accommodated in the heating cavity.

[0016] In one embodiment, the porosity of the preheating element is 30% to 80%;

[0017] And / or, the median pore size of the preheating element is 10 μm to 100 μm;

[0018] And / or, the radiation wavelength of the preheating element is 5 μm to 20 μm;

[0019] And / or, the preheating temperature of the preheating element is 40°C to 90°C;

[0020] And / or, the resistance of the heating element is 0.5Ω to 5Ω.

[0021] In one embodiment, the porosity of the substrate is 30% to 80%;

[0022] And / or, the median pore diameter of the substrate is 10 μm to 100 μm.

[0023] The method for preparing the heating element comprises the following steps:

[0024] According to a preset shape, the heating element and the raw material for preparing the porous ceramic body are molded together to prepare a green embryo; and

[0025] The green embryo is debinded and then sintered to obtain the heating element.

[0026] An atomizer, comprising:

[0027] A liquid storage chamber, used for storing liquid; and

[0028] The heating element is used to absorb the liquid in the liquid storage cavity and atomize the liquid. The heating element is the heating element mentioned above.

[0029] An electronic device comprises a power source and the above-mentioned atomizer, wherein the power source is electrically connected to the atomizer to supply power to the atomizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a heating element according to an embodiment;

[0031] Figure 2 for Figure 1 An exploded view of the heat generating body shown;

[0032] Figure 3 for Figure 1 A cross-sectional view of the heating element shown.

[0033] Reference numerals:

[0034] 10. Heating element; 110. Porous ceramic body; 120. Heating element; 111. Base; 112. Preheating element; 113. Liquid inlet surface; 121. Heating part; 130. Connecting element; 114. First groove; 115. Second groove. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below, and the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0036] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more centered elements can exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more centered elements can exist between them. When the terms "vertical", "horizontal", "left", "right", "up", "down", "inside", "outside", "bottom", etc. are used to indicate an orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0038] An embodiment of the present invention provides an atomizer, which includes a liquid storage chamber and a heating element 10, wherein the liquid storage chamber is used to store liquid (such as tobacco oil), and the heating element 10 is used to absorb the liquid in the liquid storage chamber and atomize the liquid. Specifically, the liquid storage chamber has a liquid outlet, and the heating element 10 is close to the liquid outlet. The liquid in the liquid storage chamber flows out of the liquid outlet and enters the heating element 10, thereby being atomized. Optionally, the atomizer is an electronic atomizer. In a specific example, the atomizer is an atomizer for an electronic cigarette.

[0039] See also Figure 1 to Figure 3 The heating element 10 includes a porous ceramic body 110 and a heating element 120 located on the porous ceramic body 110, wherein the porous ceramic body 110 includes a substrate 111 and a preheating element 112 located on the substrate 111. Specifically, the porous ceramic body 110 has a liquid inlet surface 113. The liquid in the liquid storage chamber flows out through the liquid outlet and enters the porous ceramic body 110 from the liquid inlet surface 113.

[0040] Specifically, the substrate 111 is a porous ceramic structure having a liquid-conducting function. Optionally, the substrate 111 is a hollow porous ceramic structure. In the illustrated embodiment, the substrate 111 is a hollow cylindrical shape. Of course, in other embodiments, the shape of the substrate 111 is not limited to a hollow cylindrical shape, and may also be other hollow structures.

[0041] In this embodiment, the porosity of the substrate 111 is 30% to 80%; the median pore size of the substrate 111 is 10μm to 100μm. The porosity of the substrate 111 and the diameter of the pores are set as described above to facilitate the substrate 111 to absorb liquid. In an optional specific example, the porosity of the substrate 111 is 30%, 40%, 50%, 60%, 70% or 80%. The median pore size of the pores of the substrate 111 is 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm or 100μm. Further, the porosity of the substrate 111 is 40% to 70%, and the median pore size of the pores of the substrate 111 is 10μm to 80μm. It is understandable that in other embodiments, the porosity and pore size of the substrate 111 are not limited to the above and can be adjusted according to actual needs.

[0042] The preheating element 112 is located near the liquid outlet and on the base 111. It is a porous infrared ceramic structure with the functions of guiding liquid and radiating infrared rays. The preheating element 112 has a liquid inlet surface 113. After the liquid flows out of the liquid storage chamber, it enters the preheating element 112 through the liquid inlet surface 113 of the preheating element 112. When flowing through the preheating element 112, it is preheated by the infrared rays radiated by the preheating element 112, and the viscosity is reduced and the fluidity is improved, so that when the heating element 10 atomizes the smoke oil, it is not easy to have slow smoke discharge, dry burning, etc. due to the poor fluidity of the smoke oil in the porous ceramic body 110.

[0043] Optionally, the preheating element 112 and the base 111 are both hollow structures, and the preheating element 112 is sleeved on the base 111. When the preheating element 112 is sleeved on the base 111, the outer peripheral surface of the preheating element 112 is the liquid inlet surface 113, and the liquid flows out of the liquid storage cavity, enters the preheating element 112 through the outer peripheral surface of the preheating element 112, and is atomized into smoke after being preheated by the preheating element 112 and heated by the heating element 120, and is discharged from the inner peripheral surface of the base 111. It is understandable that the preheating element 112 can also be nested in the base 111, that is, the base 111 is sleeved on the preheating element 112. At this time, the preheating element 112 is accommodated in the hollow part of the base 111, and the inner circumferential surface of the preheating element 112 is the liquid inlet surface 113. The liquid flows out from the liquid storage chamber, enters the preheating element 112 through the inner circumferential surface of the preheating element 112, is preheated by the preheating element 112, and is heated by the heating element 120 to be atomized into smoke, and is discharged from the outer circumferential surface of the base 111.

[0044] In the illustrated embodiment, the preheating member 112 is a hollow cylindrical shape. In an optional specific example, the substrate 111 is a hollow cylindrical shape, the preheating member 112 is a hollow cylindrical shape, the preheating member 112 is sleeved on the substrate 111, the inner diameter of the substrate 111 is 1.5 mm to 3 mm, and the outer diameter of the preheating member is 2.5 mm to 9 mm. It is understood that the size of the substrate 111 is not limited to the above, and the size of the preheating member 112 is not limited to the above, and can also be adjusted according to actual conditions, as long as its shape and size can match the substrate 111 and the liquid outlet.

[0045] It is understood that, in some embodiments, at least one of the substrate 111 and the preheating member 112 may be a non-hollow structure, and the preheating member 112 may also be a non-hollow structure. When the substrate 111 is a non-hollow structure, the preheating member 112 is a non-hollow structure. At this time, the preheating member 112 is located on one side surface of the substrate 111, and the liquid to be atomized is preheated by the preheating member 112, atomized, and discharged from the other side of the substrate 111. When the substrate 111 is a hollow structure, the preheating member 112 may be a non-hollow structure, and at this time, the preheating member 112 may be located on the substrate 111 in a stacked manner.

[0046] In this embodiment, the porosity of the preheating member 112 is 30% to 80%; the median pore size of the preheating member 112 is 10μm to 100μm. The porosity of the preheating member 112 and the diameter of the pores are set as described above to facilitate the substrate 111 to absorb liquid. In an optional specific example, the porosity of the preheating member 112 is 30%, 40%, 50%, 60%, 70% or 80%. The median pore size of the pores of the preheating member 112 is 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm or 100μm. Further, the porosity of the preheating member 112 is 40% to 70%, and the median pore size of the pores of the preheating member 112 is 20μm to 80μm. It is understandable that in other embodiments, the porosity and pore size of the preheating member 112 are not limited to the above and can be adjusted according to actual needs.

[0047] When far infrared rays are irradiated onto the heated object, part of the rays are reflected back and part of them are absorbed by the object. When the wavelength of the emitted far infrared rays is consistent with the absorption wavelength of the heated object, the heated object absorbs the far infrared rays. At this time, the molecules and atoms inside the object "resonate" - strong vibrations and rotations are generated, and the vibrations and rotations increase the temperature of the object, achieving the purpose of heating the object. Therefore, the wavelength radiated by the preheating member 112 can be selected according to the heated substance. Optionally, the heated object is smoke oil, and the radiation wavelength of the preheating member 112 is 5μm to 20μm. By setting the radiation wavelength of the preheating member 112 to 5μm to 20μm, the effective ingredients in the smoke oil (such as flavors, glycerol, nicotine, etc.) can be precisely heated, precise atomization can be achieved, and the effective atomization concentration of the effective ingredients can be increased. Of course, the radiation wavelength of the preheating member 112 is not limited to the above, and can also be other radiation wavelengths, as long as it can match the absorption wavelength of the heated object.

[0048] In one embodiment, the preheating element 112 is a room temperature porous infrared ceramic structure. The room temperature here refers to 25°C to 150°C. In this embodiment, the preheating temperature of the preheating element 112 is 40°C to 90°C. The preheating temperature refers to the temperature that the liquid can reach after being preheated by the preheating element 112. This temperature is suitable for preheating the e-cigarette oil. Of course, when the atomized liquid is not the e-cigarette oil but other liquids, the preheating temperature of the preheating element 112 can be adjusted according to the specific liquid that needs to be atomized.

[0049] The heating element 120 is used to provide heat to the preheating element 112 and atomize the preheated liquid. A part of the heat released by the heating element 120 directly heats the liquid to atomize it, and another part is conducted to the preheating element 112, so that it absorbs heat and radiates infrared rays.

[0050] Specifically, the heating element 120 is located in the porous ceramic body 110 for generating heat; in the illustrated embodiment, the heating element 120 is located at the junction of the substrate 111 and the preheating element 112. The heating element 120 is arranged at the junction of the substrate 111 and the preheating element 112, so that the heat generated by the heating element 120 can be fully utilized, satisfying the preheating and atomization requirements. Specifically, the surface of the substrate 111 close to the preheating element 112 is recessed to form a first groove 114, and the surface of the preheating element 112 close to the substrate 111 is recessed to form a second groove 115 corresponding to the first groove 114. The first groove 114 and the second groove 115 form a heating cavity, and the heating element 120 is accommodated in the heating cavity.

[0051] It is understandable that in other embodiments, the heating element 120 can be completely embedded in the preheating element 112, or completely embedded in the base 111. For example, the heating element 120 is completely located in the preheating element 112 and away from the liquid outlet; or, the heating element 120 is completely located in the base 111 and close to the preheating element 112.

[0052] In the illustrated embodiment, the heating element 120 is distributed in a spiral shape on the base 111. Of course, in some other embodiments, the shape of the heating element 120 is not limited to the spiral shape, but can also be other shapes, such as at least one of a sheet shape, a strip shape, an S shape, and a U shape.

[0053] In one embodiment, the heating element 120 includes a heating portion 121. Optionally, the heating portion 121 is a heating wire. In an optional specific example, the heating portion 121 is a heating wire (i.e., a single wire). In this embodiment, the resistance of the heating portion 121 is 0.5Ω to 1.5Ω. Further, the resistance of the heating portion 121 is 0.8Ω to 1.3Ω.

[0054] In some embodiments, the heating element 120 further includes an infrared heating layer (not shown) located on the heating portion 121. By providing the infrared heating layer on the heating portion 121, the heat utilization rate of the heating portion 121 is higher, which is more conducive to the preheating element 112 receiving more and more uniform heat, and preheating is faster. Optionally, the thickness of the infrared heating layer is 20μm to 500μm. Further, the thickness of the infrared heating layer is 20μm to 80μm.

[0055] In some embodiments, the substrate 111 can be omitted. When the substrate 111 is omitted, the heating element 120 can be located in the preheating element 112 and away from the liquid outlet, so that the liquid is preheated first and then atomized. At this time, the heating element 120 transfers heat energy to the preheating element 112 and causes the preheating element 112 to radiate heat energy to preheat the liquid. The preheated liquid flows through the heating element 120 and is atomized, thereby releasing smoke. Of course, when the substrate 111 is omitted, the heating element 120 can also be located on the outer surface of the preheating element 112, as long as it can provide heat for the preheating element 112 to preheat the smoke oil and atomize the smoke oil. For example, the preheating element 112 is a non-hollow structure, one side of the preheating element 112 is close to the liquid outlet, and the heating element 120 is located on the surface of the preheating element 112 and away from one side of the liquid outlet. At this time, the liquid flowing out of the liquid outlet enters the preheating member 112 at a position close to the liquid outlet, is first preheated by the preheating member 112, and then is atomized and released by the heating element 120 on the surface of the preheating member 112. For another example, the preheating member 112 is a hollow structure, and the heating element 120 is located on the outer peripheral surface of the preheating member 112. At this time, after the liquid flows out of the liquid outlet, it enters the preheating member 112 through the inner peripheral surface of the preheating member 112, is first preheated by the preheating member 112 and then heated by the heating element, thereby releasing smoke from the outer peripheral surface of the preheating member 112.

[0056] In some embodiments, the heating element 120 may also be located on the surface of the porous ceramic body 110. For example, when the base 111 is omitted, the heating element 120 is located on the outer surface of the preheating element 112.

[0057] Of course, the heating element 10 further includes a connecting member 130 , which is used to electrically connect the heating element 120 to a power source. In the illustrated embodiment, the connecting member 130 passes through the outer peripheral surface of the preheating element 112 .

[0058] The heating element 10 includes a porous ceramic body 110 and a heating element 120 located on the porous ceramic body 110, and has at least the following advantages:

[0059] (1) A portion of the heat provided by the heating element 120 can heat the preheating element 112 and radiate infrared rays, thereby preheating the e-liquid, and then reducing the viscosity of the e-liquid after entering the porous ceramic body 110, increasing its fluidity, and allowing it to flow more quickly to the vicinity of the heating element 10, and being heated and atomized more quickly by the heating element 120. Therefore, the heating element 10 can smoothly conduct the e-liquid in the porous ceramic body 110 through the cooperation between the preheating element 112 and the heating element 120, and is less likely to have problems such as slow smoke emission and dry burning of the heating element 10, thereby improving the user experience. It has been verified that the heating element 10 has a particularly significant effect on the improvement of e-liquid with higher viscosity.

[0060] (2) Since the radiation wavelength of infrared heating is selective, the heating element 10 can be designed specifically for the effective components in the e-liquid, thereby achieving precise atomization and improving the effective atomization concentration. At the same time, since the infrared rays of a specific wavelength resonate with the effective components of the e-liquid to heat the e-liquid, the thermal efficiency is higher than that of heating with a heating wire alone, which can significantly reduce energy consumption.

[0061] (3) Since infrared heating has uniform heating, it can avoid problems such as local overtemperature caused by uneven heating lines and burnt smell caused by dry burning of e-liquid, thereby improving the taste.

[0062] Since the atomizer includes the heating element 10, smoke is emitted quickly, dry burning is not easy, and energy saving is achieved.

[0063] In addition, an embodiment of the present invention further provides an electronic device, which includes a power supply and the above-mentioned atomizer, wherein the power supply is electrically connected to the above-mentioned atomizer to supply power to the atomizer. More specifically, the above-mentioned electronic device is an electronic cigarette.

[0064] In addition, an embodiment of the present invention further provides a method for preparing the above-mentioned heating element, wherein steps a to b of the preparation method are specifically:

[0065] Step a: According to a preset shape, the raw material for preparing the porous ceramic body and the heating element are molded together to prepare a green embryo.

[0066] Specifically, the raw materials for preparing the porous ceramic body include raw materials for preparing the substrate and raw materials for preparing the preheating member.

[0067] More specifically, the raw materials for preparing the matrix include ceramic powder, sintering aid and pore former. Specifically, the types of ceramic powder, pore former and sintering aid are not particularly limited, and the ceramic powder, pore former and sintering aid commonly used in the art can be used. For example, the ceramic body can adopt a diatomaceous earth system or a zeolite system. It should be noted that "ceramic powder" refers to a powdery substance obtained by calcining the raw materials used in the preparation of ceramics (excluding sintering aids and pore formers) after being fully mixed and uniformly mixed.

[0068] In one embodiment, the raw materials for preparing the matrix include 40 to 70 parts of ceramic powder, 5 to 30 parts of sintering aids and 10 to 30 parts of pore formers, by weight. Further, the raw materials for preparing the matrix include 45 to 70 parts of ceramic powder, 10 to 30 parts of sintering aids and 15 to 30 parts of pore formers, by weight. Of course, in other embodiments, the types and contents of the components of the raw materials for preparing the matrix are not limited to the above, and can also be adjusted according to actual conditions.

[0069] More specifically, the raw materials for preparing the preheating part include ceramic powder, sintering aid and pore-forming agent, wherein the ceramic powder includes far-infrared ceramic powder. Far-infrared ceramic powder refers to ceramic powder with far-infrared radiation performance. Optionally, the far-infrared ceramic powder includes at least one of far-infrared ceramic powder with spinel or anti-spinel ferrite structure, and high-performance infrared ceramic powder prepared by mixed sintering of transition metal oxide and cordierite system silicate material. Further, the far-infrared ceramic powder with spinel or anti-spinel ferrite structure is a far-infrared ceramic powder with spinel or anti-spinel ferrite structure composed of transition metal oxides (such as NiO, Cr2O3, TiO2, MnO2, CuO, CoO, Fe2O3, ZnO, etc.).

[0070] In one embodiment, the raw materials for preparing the preheating part include 40 to 80 parts of ceramic powder, 5 to 30 parts of sintering aid and 10 to 30 parts of pore formers by weight, wherein the ceramic powder is far-infrared ceramic powder. Further, the raw materials for preparing the preheating part include 50 to 80 parts of far-infrared ceramic powder, 10 to 30 parts of sintering aid and 15 to 30 parts of pore formers by weight, wherein the ceramic powder is far-infrared ceramic powder.

[0071] In another embodiment, the ceramic powder in the raw material for preparing the preheating part includes far-infrared ceramic powder and ordinary ceramic powder. That is, the ceramic powder in the raw material for preparing the preheating part includes far-infrared ceramic powder, ordinary ceramic powder, sintering aid and pore former. In an optional specific example, in parts by mass, the raw material for preparing the preheating part includes 40 to 80 parts of ceramic powder, 5 to 30 parts of sintering aid and 10 to 30 parts of pore former, wherein the ceramic powder includes far-infrared ceramic powder and ordinary ceramic powder. Further, in parts by mass, the raw material for preparing the preheating part includes 45 to 70 parts of far-infrared ceramic powder, 10 to 30 parts of sintering aid and 15 to 30 parts of pore former, wherein the ceramic powder includes far-infrared ceramic powder and ordinary ceramic powder. Of course, in other embodiments, the types and contents of the components of the raw materials for preparing the preheating part are not limited to the above, and can also be adjusted according to actual conditions.

[0072] In one embodiment, the heating element includes a heating portion and an infrared heating layer located on the heating portion. The material of the heating portion is not particularly limited and can be selected according to the resistance value of the heating element to be prepared.

[0073] The materials for preparing the infrared heating layer include far-infrared ceramic powder, a binder and a solvent. The far-infrared ceramic powder may be the same as the far-infrared ceramic powder used in the above-mentioned preheating part, or it may be different from the far-infrared powder used in the above-mentioned preheating part. The binder is selected from at least one of an inorganic binder and an organic binder. Specifically, the inorganic binder is selected from at least one of aluminum sol and sodium silicate. The organic binder is selected from at least one of CMC (hydroxymethyl cellulose), acrylic polymer, PVA (polyvinyl alcohol) and dextrin. Of course, the binder is not limited to the above, and can also be other substances that can be used as a binder.

[0074] Optionally, the step of preparing a heating element with an infrared heating layer includes: preparing the material for preparing the infrared heating layer into a slurry; and spraying the slurry on the heating wire using a spraying process (for example, ion spraying, spray gun, etc.), and then molding, debinding, and sintering to prepare the heating element. It is understandable that the heating element can be sintered first, and then molded, debinded, and sintered together with the raw material for preparing the porous ceramic body to prepare the heating element, or the molded heating element (the green embryo of the heating element) can be molded again together with the raw material for preparing the porous ceramic body, and then debinded and sintered to prepare the heating element.

[0075] It should be noted that the shrinkage matching problem between the preheated part and the matrix after sintering can be solved by adjusting the mass ratio of the sintering aid, the pore-forming agent and the skeleton-forming agent.

[0076] Optionally, the molding method in the process of preparing the green embryo is one of injection molding, gel casting molding and dry pressing molding. Of course, the molding method in the process of preparing the green embryo is not limited to the above, and can also be other methods.

[0077] Step b: debinding the green embryo and sintering it to obtain a heating element.

[0078] Specifically, the debinding temperature is 350°C to 700°C, and the sintering temperature is 800°C to 1200°C. Further, the debinding temperature is 450°C to 650°C, and the sintering temperature is 750°C to 1100°C. Of course, in other embodiments, the debinding temperature and the sintering temperature are not limited to the above, and the debinding and sintering temperatures can be adjusted according to the prepared porous ceramic body.

[0079] The preparation method of the heating element is simple, and the prepared heating element has a preheating function and a good liquid guiding effect, especially for liquids with high viscosity, and is not prone to problems such as poor liquid guiding and dry burning of the heating element. In addition, the preparation method of the heating element is simple and easy to industrialize.

[0080] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A heating element, characterized in that: include: A porous ceramic body having a liquid guiding function, wherein the porous ceramic body has a liquid inlet surface for allowing liquid to enter the porous ceramic body from the liquid inlet surface, wherein the porous ceramic body comprises a preheating element, wherein the preheating element is a porous infrared ceramic structure, and wherein the preheating element is used to preheat the liquid entering the porous ceramic body from the liquid inlet surface; and The heating element is located on the porous ceramic body and is used to provide heat for the preheating element to preheat the liquid and atomize the preheated liquid. The heating element includes a heating part, which is a heating wire.

2. The heating element according to claim 1, characterized in that: The porous ceramic body also includes a substrate, the preheating element is located on the substrate, the substrate is a porous ceramic structure, and the heating element is completely located in the preheating element and close to the substrate or at the junction of the substrate and the preheating element.

3. The heating element according to claim 2, characterized in that: The substrate is a hollow porous ceramic structure, the preheating element is a hollow porous infrared ceramic structure, and the substrate and the preheating element are nested with each other.

4. The heating element according to claim 3, characterized in that: The preheating element is sleeved on the base, and the heating elements are distributed in a spiral shape on the base.

5. The heating element according to claim 4, characterized in that: The heating element includes a heating portion and an infrared heating layer located on the heating portion.

6. The heating element according to claim 5, characterized in that: The infrared heating layer has a thickness of 20 μm to 500 μm.

7. The heating element according to claim 3, characterized in that: The base is in the shape of a hollow cylinder, the preheating piece is in the shape of a hollow cylinder, the preheating piece is sleeved on the base, the inner diameter of the base is 1.5 mm to 3 mm, and the outer diameter of the preheating piece is 2.5 mm to 9 mm.

8. The heating element according to claim 2, characterized in that: The surface of the base body near the preheating element is recessed to form a first groove, and the surface of the preheating element near the base body is recessed to form a second groove corresponding to the first groove. The first groove and the second groove form a heating cavity, and the heating element is accommodated in the heating cavity.

9. The heating element according to any one of claims 1 to 8, characterized in that: The porosity of the preheating member is 30% to 80%; And / or, the median pore size of the preheating element is 10 μm to 100 μm; And / or, the radiation wavelength of the preheating element is 5 μm to 20 μm; And / or, the preheating temperature of the preheating element is 40°C to 90°C; And / or, the resistance of the heating element is 0.5Ω to 1.5Ω.

10. The heating element according to any one of claims 2 to 8, characterized in that: The porosity of the matrix is ​​30% to 80%; And / or, the median pore diameter of the substrate is 10 μm to 100 μm.

11. The method for preparing a heating element according to any one of claims 1 to 10, characterized in that: The following steps are involved: According to a preset shape, the heating element and the raw material for preparing the porous ceramic body are molded together to prepare a green embryo; and The green embryo is debinded and then sintered to obtain the heating element.

12. An atomizer, characterized in that: include: A liquid storage cavity, used for storing liquid; and A heating element is used to absorb the liquid in the liquid storage chamber and atomize the liquid. The heating element is the heating element according to any one of claims 1 to 10.

13. An electronic device, characterized in that: The invention comprises a power source and the atomizer according to claim 12, wherein the power source is electrically connected to the atomizer to supply power to the atomizer.

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