RU2783204C1 - Electronic cigarette heater with air heating, ceramic heater and method for its manufacture - Google Patents

Abstract

FIELD: smoking accessories.

SUBSTANCE: invention relates to an electronic cigarette heater with air heating, a ceramic heater and a method for its manufacture. The expected result is achieved by the fact that the ceramic heater contains a cellular ceramic housing and a heating printed circuit, while the cellular ceramic housing is provided with a section with channels made in the form of round or polygonal holes; the heating printed circuit is located around the outer surface of the cellular ceramic housing for heating the air passing through the section with channels, and the result is achieved by an electronic cigarette heater with air heating containing such a ceramic heater and the method for manufacturing such a ceramic heater.

EFFECT: high heating efficiency.

14 cl, 7 dwg

Description

Technical field

The invention relates to the technical field of electronic cigarettes, in particular to a ceramic heater, an air-heating electronic cigarette heater with this ceramic heater, and a method for manufacturing a ceramic heater.

Prior Art

Smoking products such as cigarettes and cigars burn tobacco during use and form tobacco smoke. A burning cigarette contains many carcinogenic substances such as tar in its smoke, long-term inhalation of these substances can cause great harm to the human body. With the scientific and technological progress of science and technology and people's desire for a healthy lifestyle, a cigarette substitute has appeared, namely electronic cigarettes. In particular, providing a substitute for these types of products by producing products that release compounds without burning is one typical option for electronic cigarettes. Examples of such products are so-called non-combustion heating products, also called tobacco heating products or tobacco heating devices, which release compounds by heating a given material without burning it.

Currently on the market, existing non-combustion heating electronic cigarettes, their heating and sintering technology mainly uses the heat transfer method for heat transfer and heat exchange, the existing heating methods are plate heating (needle heating) and tube heating methods, for example, in CN201380044053.7 published "Smoking product used with internal heating elements", their heating method is plate heating method (needle heating), but this heating method has a higher temperature in the center, lower ambient temperature, the tobacco near the plate heater is completely charred, even burnt , and the surrounding tobacco is not yet charred, which leads to a large consumption of tobacco; and, for example, in CN201080053099.1, "Internal or external heater electronic heating smoking system" is published, its heating method is tube heating, and tube heating is that the part near the tube wall is more completely charred, and the center can not completely charred, if you raise the temperature, the cigarette paper will burn, and affect the mouthfeel. Generalizations and conclusions that existing heating devices have technical shortcomings such as uneven sintering, little smoke, poor mouthfeel and poor user experience, and after long-term use of electronic cigarettes, the contaminants generated by inhaling will attach to products and cause bad smell.

The essence of the invention

This application is based on deep research and constant experimentation of the author on the following issues:

In the relevant technical field, the heating product mainly contains the following three types of heating elements:

I. Ceramic heating plate

Ceramic heating plate is made of zirconium ceramic base and precious metal heating alloy, with small volume, light weight, can achieve high power density, high thermal efficiency; it has excellent thermal performance with a fast temperature rise rate, allowing any temperature distribution to be obtained; high reliability and long service life, excellent resistance to acids and alkalis, in addition, the heater materials do not oxidize; corrosion resistance and high temperature resistance, uniform temperature, good thermal conductivity and high temperature compensation rate.

However, when the ceramic heater is used to heat smoking products, heating the center will cause the temperature of the entire heater to be unevenly distributed, and the temperature difference between the top and bottom reaches about 100°C, which causes incomplete sintering of tobacco, even a burning smell, and also large consumption. tobacco, in addition, requires the use of a special smoke cartridge and a plate heater to obtain the desired effect, which limits the scope.

II. Cylindrical heating rod

The rod structure heater has high strength and is resistant to fracture, under high temperature heating, the ceramic heater has good density, the heating wire is fully wrapped with ceramic, and it is highly reliable for long-term use, the solder joints are resistant to high temperature up to 350°C for a long time , since the technology of 1000 ° C soldering with silver solder is used.

However, heating the body of the rod with the heating wire requires a high temperature of the heating wire to achieve the heating effect. Therefore, the heat exchange efficiency is low, and due to the high temperature of the heating wire, the metal ions separated from the heating coil may mix with the smoking air flow and enter the human body, which may harm human health.

III. Ceramic heating cup/heating tube/heating vessel

The heating cup/heating tube/heating vessel are typical examples of spatial heating. Annular step heating with precise temperature control. However, the low heat utilization rate is the biggest disadvantage of this method, part of the heat is absorbed by the tobacco, the other part is released as heat, if the heat insulation is poor, the smoking tool will burn the hand, affect the use of the user.

As described above, the contact heating and sintering technology mainly performs heat transfer and heat transfer exchange, that is, a heating conductor (eg, a ceramic heating plate or a needle) transfers a temperature to a sintered object (smoking article). The disadvantage of this heating method is mainly: 1. The poor thermal conductivity of the sintered object (smoking product) cannot fully transfer the temperature, resulting in uneven sintering inside and outside the sintered object; 2. There is a large difference in the spatial density of various types of sintered objects, when replacing different types of sintering objects, it is difficult to ensure their heating and sintering effect, it is usually necessary to use suitable sintering objects to obtain a good effect, so adaptability is poor. In general, existing heating devices have technical disadvantages such as uneven sintering, little smoke, poor mouthfeel and poor user experience, these disadvantages seriously limit the further development and implementation of technology in this field.

Therefore, after a lot of research and experimentation, the present applicant has found that the smoking process itself is an air flow process, if the temperature of the air flowing into the smoking article is high, the hot air can directly play the role of sintering the smoking article, also due to the fact that hot air can relatively completely and uniformly penetrate and sinter the entire tobacco of the smoking article with the puffing process, the problem of uneven heating can be effectively solved. Therefore, the smoking article is sintered by air heating, then using the hot air flow in the puffing process to perform heating, this scheme can give a good overall heating effect.

However, when applying the air heating circuit, firstly, it is necessary to select a suitable heater for heating the air, and when the heater heats the air, room temperature air must enter the heater, and the air temperature after the heater must reach 300°C or more; secondly, the general puff habit must be taken into account, that is, a temperature increase of about 20 ml per second should be provided, and each puff should last about 3 seconds, the heater needs about 60 ml of air for overall heating efficiency.

In order to achieve the above effect, after a lot of experiments, the author came to the conclusion that when using a heating wire for heating air, a higher temperature of the heating wire is required to heat the air only by heating the wire, and only when the temperature of the heating wire is higher than 600°C, can heat the flowing air to a temperature above 300°C, also if the air flow flows, the heating wire will be rapidly cooled, so that one puff will cause the temperature of the heating wire to decrease by 200-300°C. Therefore, it is necessary to compensate for the power of the heating wire when puffing, otherwise it is difficult to achieve the effect of heating the air required for smoking a cigarette, while power compensation is achieved by detecting the air flow by the air flow sensor, due to the small contact area of the heating wire with air, this scheme Power compensation not only requires high power to achieve the desired heating effect, but there is also the problem of uneven temperature distribution in all directions due to incorrect air temperature after heating and delayed compensation response.

At the same time, when the air flow is heated to a temperature above 300 ° C by increasing the temperature of the heating wire, an increase in the temperature of the heating wire can lead to the penetration of metal ions into the human body, which are separated by the heating wire and mixed with the smoking air flow, which endangers health. person.

Based on the above, after a lot of research, the present inventor has come to the conclusion that when using air heating to sinter a smoking article, the air heated heater needs a large heating area to reduce the temperature difference between the heater and the air, while the heater also a large heat capacity is required to resist cooling after passing through the smoking air flow, the heater also requires a higher thermal conductivity to shorten the preparation time for heating.

Therefore, based on many years of in-depth research on ceramics, the applicant found that the porous structure of honeycomb ceramics can provide a large heating surface area so that the heater has high air heating efficiency, at the same time, honeycomb ceramics of porous structure, more like a solid structure, has a higher heat capacity than ceramic tube of the same volume, moreover, the thermal conductivity of aluminum oxide material is more than 30W/m*K, it can achieve faster and more uniform heat transfer, as well as high thermal conductivity, thus, honeycomb ceramic porous structure heater can meet the sintering needs of fuming products by heating the air.

The first object of the present invention is to provide a ceramic heater with fast and uniform heating, large heating surface, low power consumption, long service life, good thermal insulation performance.

To achieve this, the ceramic heater provided in the embodiment of the first aspect of the present invention includes: a honeycomb ceramic body, wherein the honeycomb ceramic body has porous channels that are round holes or polygonal holes; and a heating circuit located around the outer surface of the honeycomb ceramic body for heating the air passing through the porous channels.

Wherein, the honeycomb ceramic body is an alumina honeycomb ceramic body, and the density of the alumina honeycomb ceramic body is not less than 3.86 g/cm ³ .

In this case, the porous channels are evenly distributed in the honeycomb ceramic body.

In this case, the porous channels are located in the center of the honeycomb ceramic body.

Here, the honeycomb ceramic body is a cylindrical body with a round or polygonal cross section.

Specifically, the alumina ceramic honeycomb package provided in the embodiment of the present invention includes: an alumina ceramic honeycomb package, a heating circuit and a wire, porous channels are located in the center of the alumina ceramic honeycomb package, the porous channels are uniformly spaced round holes or polygonal holes; the heating printed circuit is located around the outer surface of the honeycomb ceramic body; a wire is located at the first end of the heating printed circuit.

In this case, the resistance of the alumina honeycomb ceramic body is 0.1-2 Ω.

At the same time, the alumina honeycomb ceramic body is a cylindrical body with a round or polygonal cross section.

In this case, the opening diameter of the porous channels is 0.1-2 mm, the wall thickness of the porous channels is 0.1-0.5 mm.

Meanwhile, the heating printed circuit materials include, but are not limited to, silver, tungsten, MoMn, and other suitable printed circuit materials.

At the same time, the printing thickness of the heating printed circuit is 0.005-0.05 mm.

Meanwhile, wire materials include but are not limited to copper, silver, and nickel, and the wire diameter is 0.1-0.3 mm.

According to the ceramic heater in the embodiment of the present invention, the surface density of the high purity alumina honeycomb ceramic is very high, it can effectively prevent the adsorption of dust particles and protect against bad smell. The high purity alumina honeycomb ceramic has good thermal conductivity, the thermal conductivity is up to 33W/m*K, the wall thickness and hole diameter of the honeycomb ceramic structure is very small, with good thermal conductivity, at the same time, the shape of the honeycomb porous structure can greatly increase the air contact area, the alumina honeycomb ceramic is large, with high heating efficiency, can quickly complete the purpose of air heating. The honeycomb ceramic heater of the present invention is located under the sintering cigarette and does not contact with the cigarette, when the user smokes the cigarette, the air heated by the honeycomb ceramic heater at the bottom contact with the cigarette, heat the cigarette quickly and evenly, due to the honeycomb porous structure, the air flow rate limited to a certain extent, the contact time of hot air with a cigarette is longer, which slows down the heat loss, saves energy. When there is no smoking process, the porous structure of honeycomb ceramic can block hot air at the same time, reducing the outflow of hot air, further saving energy.

The second object of the present invention is to provide an air heating electronic cigarette heater with uniform sintering and no product contamination due to direct contact of contaminants in the liquid, or a smoke cartridge heater.

To achieve this object, the air-heating electronic cigarette heater, the ceramic heater provided in the embodiment of the second aspect of the present invention, includes the ceramic heater described in the embodiment; pre-heating device, ceramic heater is located under the pre-heating device.

In this case, the preheating device includes a preheating tube, a deflector is located between the preheating tube and the ceramic heater, and a plurality of guide holes are located on the deflector.

In this case, the ceramic heater and the device for preheating are located in the sealing sleeve.

Wherein, the device for preheating includes a thin-walled alumina ceramic tube for preheating, an empty cavity in the center of the thin-walled alumina ceramic tube is used to accommodate a smoking product (product), a hole at one end of the thin-walled alumina ceramic tube and a bottom plate form a cup body, on the bottom plate there are many through holes for hot air flow.

The density of the thin-walled alumina ceramic tube is not less than 3.86 g/cm ³ .

At the same time, a plurality of through holes for hot air flow are evenly located in the center of the bottom plate around the virtual circle, the hole for hot air flow is a round hole, the hole diameter range is 0.1-2 mm.

At the same time, the material of the lower plate is a high purity alumina ceramic.

In an embodiment of the present invention, the air-heated electronic cigarette heater includes a preheat tube and a ceramic heater, a ceramic heater is disposed below the preheat tube; the ceramic heater includes a honeycomb ceramic body and a heating printed circuit, which is located on the ceramic heater, a wire is located at the end of the heating printed circuit, honeycomb porous channels are located in the ceramic heater.

At the same time, the preheating tube, ceramic heater and deflector are made of high purity alumina ceramics.

Meanwhile, the printed materials of the heating printed circuit include, but are not limited to, silver, tungsten, MoMn.

Meanwhile, wire materials include, but are not limited to, silver, copper, and nickel.

At the same time, honeycomb porous channels are evenly spaced round holes or polygonal holes, the hole diameter range is 0.1-2 mm, the minimum distance between two adjacent holes is 0.1-0.5 mm.

The air-heating electronic cigarette heater according to an embodiment of the present invention heats the air with the heater so that the heated air stream evenly sinters the tobacco to obtain the effect of increasing the volume of smoke, good mouthfeel and good user experience. At the same time, the preheating tube, heater and deflector are made of high purity alumina ceramic with high density, almost no pores in microstructure, pollutants in the liquid can not penetrate through them, can not leave dirt and bad smell on the surface, also heating method air protects the device from contamination, as it does not come into contact with the smoke cartridge.

Moreover, the preheating device can provide rapid and uniform heating, so as to perform preheating and thermal insulation.

The preheating device includes a thin-walled alumina ceramic tube for preheating, an empty cavity in the center of the thin-walled alumina ceramic tube is used to accommodate a smoking product; a hole at one end of the thin-walled alumina ceramic tube and the bottom plate form the body of the cup, and the bottom plate has a plurality of through holes for hot air flow.

The density of the thin-walled alumina ceramic tube is not less than 3.86 g/cm ³ .

At the same time, the thin-walled alumina ceramic tube is a hollow round tube, the range of its wall is 0.1-0.5 mm.

In this case, the shape of the bottom plate corresponds to the shape of the hole in the cross section of the thin-walled alumina ceramic tube.

At the same time, a plurality of through holes for hot air flow are evenly located in the center of the bottom plate around the virtual circle, the hot air flow hole is a round hole, the hole diameter range is 0.1-2 mm.

The thickness of the bottom plate is 0.1-0.5 mm.

At the same time, the material of the lower plate is a high purity alumina ceramic.

The pre-heating device is installed above the air heating element, when the heating element is heated, due to the fact that the bottom plate and the thin-walled alumina ceramic tube are made of high purity ultra-thin alumina ceramics, when the heating element heats them, they can quickly heat up for preheating empty cavity.

The thin-walled alumina ceramic tube is not used as a traditional heater, which can reduce heat loss. The heating of the smoking product is carried out by the puffing action of the user, the hot air is exhausted from the heater from under the hot air flow hole to bake the smoking product, good sintering effect and uniform sintering is ensured, on the one hand, the hot air hole can facilitate the circulation of hot air ; on the other hand, direct diffusion of hot air is prevented when no one is smoking, thus achieving heat preservation. The high purity alumina ceramic material has good density, reduces the adsorption of flue dust particles, does not produce bad smell, so it is safer to use.

A third object of the present invention is to provide a method for manufacturing a ceramic heater.

To achieve this goal, the method for manufacturing a ceramic heater represented by an embodiment of the third aspect of the present invention includes the following steps:

Step I: Preparation of the mass of alumina ceramics: adding magnesium nitrate 0.01-0.05 weight part, zirconium oxychloride 0.01-0.05 weight part, yttrium nitrate 0.01-0.05 weight part, oleic acid 1 weight part ,5-2.5, lubricant by weight part 1-2, binder by weight part 3-15, also deionized water by weight part 10-30 into nanometer alumina powder by weight part 100, placing them in a mixer and mixing at a temperature below 30 ° C 1-5 h, so as to prepare a mass of alumina honeycomb ceramics with a uniform distribution and a solids content of 75-85% for subsequent use;

Step II: Molding of the alumina honeycomb ceramic: adding the body of the alumina honeycomb ceramic prepared in step I to the screw extrusion molding machine with vacuum air bubble removal device, the ceramic body is extruded through the die head by pushing the screw into hollow thin-walled honeycomb ceramic blanks;

Step III: Drying of the alumina honeycomb ceramic blanks: transfer the ceramic blanks prepared in step II to the furnace under hot air conditions at 40-50°C, dry and dehydrate for 5-10 minutes, obtain ceramic blanks that meet the requirements for appearance and straightness.

Step IV: Removing the adhesive of alumina unfired ceramics: pre-firing the unfired ceramic prepared in step III at a temperature of 1100-1200°C, obtaining pre-fired ceramic blanks;

Step V: firing of alumina honeycomb ceramics: placing the pre-fired ceramic blanks obtained in step IV into a high-temperature molybdenum tube, firing them in hydrogen or directly in air at 1600-1800°C, obtaining alumina honeycomb ceramics;

Step VI: fabrication of the heating printed circuit on the surface of the alumina honeycomb ceramics: using screen printing technique, printing a thick-film thermoelectrode wire on the outer surface of the alumina honeycomb ceramics prepared in step V, after drying the printed circuit, silver solder coating on the contact pad to adhere the wire, placing them again in an oven to dry, then transferring them to a firing furnace at 800-1500°C, obtaining an embedded fired wire and a printed circuit, and at the same time, completing the silver soldering of the wire in the furnace.

Meanwhile, the purity of the nanometer alumina used in step I is greater than or equal to 99.99%, the particle size is 350 nm, and the specific surface area is 7 m ² /g.

The purity of the alumina honeycomb ceramics prepared by the manufacturing method according to the embodiment of the present invention is about 99.99%, so that the surface of the honeycomb ceramics has a high density, can effectively prevent the adsorption of dust particles and protect against bad smell. The high purity alumina honeycomb ceramic has good thermal conductivity, the thermal conductivity is up to 33W/m*K, the wall thickness and hole diameter of the honeycomb ceramic structure is very small, with good thermal conductivity, at the same time, the shape of the honeycomb porous structure can greatly increase the air contact area, the alumina honeycomb ceramic is large, with high heating efficiency, helps to complete the purpose of air heating faster. The honeycomb ceramic heater of the present invention is located under the sintering cigarette, and does not contact with the cigarette, when the user smokes a cigarette, the air heated by the honeycomb ceramic heater at the bottom contact with the cigarette, heat the cigarette quickly and evenly, due to the honeycomb porous structure, the flow rate air is limited to a certain extent, the contact time of hot air with a cigarette is longer, which slows down the loss of heat, saves energy. When there is no smoking process, the porous structure of honeycomb ceramic can block hot air at the same time, reduce the external outflow of hot air, save energy even more.

Description of attached figures

Figure 1 - Diagram of the structure of a ceramic heater according to an embodiment of the present invention;

Figure 2 - Diagram of a plan scan of a printed circuit on the surface of an alumina honeycomb ceramic heater according to an embodiment of the present invention;

Figure 3 is a structural diagram of an air-heating electronic cigarette heater according to an embodiment of the present invention;

Figure 4 is a structure diagram of an air-heated electronic cigarette heater according to another embodiment of the present invention;

Figure 5 is a structure diagram of an air-heated electronic cigarette heater according to another embodiment of the present invention;

Figure 6 - Diagram of the structure of the deflector according to an embodiment of the present invention;

Figure 7 - Structural diagram of a preheater according to an embodiment of the present invention.

Detailed description of the implementation methods

In order to further clarify the objectives, technical solution and advantages of the embodiments of the present invention, in conjunction with the accompanying figures in the embodiment of the present invention, the technical solutions in the embodiment of the present invention will be clearly and completely described below. It is clear that the embodiments described are part of the embodiments of the present invention and not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present invention. Therefore, the following detailed description of embodiments of the present invention, presented in the accompanying figures, is not used to limit the scope of the claimed invention, but only represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In describing the present invention, it should be explained that the ratio of orientations or positions that indicate the terms "top", "bottom", "inner", "outer", "front end", "rear end", "both ends", "one end", "other end" and others based on the accompanying figures, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the above device or element must have a particular orientation, be built or operate in a particular direction, and cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to describe the purpose, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, unless otherwise clearly defined and limited, the terms "installation", "installed", "connection" and so on should be understood in a broad sense, for example, "connection" can be understood as a fixed connection, also can be understood as a removable connection, or an integral connection; can be understood as a mechanical connection, or can be understood as an electrical connection; can be understood as a direct connection, can also be understood as an indirect connection through an intermediate medium, can be understood as an internal connection between two components. One of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The following describes a ceramic heater, an air-heating electronic cigarette heater with a ceramic heater, and a method for manufacturing a ceramic heater as embodiments of the present invention based on the accompanying figures.

As shown in Figure 1, the ceramic heater represented by an embodiment of the present invention includes a honeycomb ceramic body 1 and a heating circuit 2. In particular, porous channels 11 are located in the ceramic honeycomb body 1, the porous channels 11 are evenly spaced round holes or polygonal holes; a heating printed circuit 2 is surrounded and located on the outer surface of the honeycomb ceramic body 1 to heat the air passing through the porous channels 11.

Wherein, as an embodiment, the honeycomb ceramic body is an alumina honeycomb ceramic body, and the density of the alumina honeycomb ceramic body is not less than 3.86 g/cm ³ .

In this case, as an embodiment, the porous channels are evenly spaced in the honeycomb ceramic body.

In this case, as an embodiment, the porous channels are located in the center of the honeycomb ceramic body.

Here, as an embodiment, the honeycomb ceramic body is a cylindrical body with a circular or polygonal cross section.

With the help of the accompanying figures, specific embodiments of the present invention are described in detail.

Embodiment I:

As shown in Figure 1-2, the alumina honeycomb ceramic body of the present invention includes: the alumina honeycomb ceramic body 1, the heating circuit 2 and the wire 3, porous channels 11 are located in the center of the alumina honeycomb ceramic body 1, the porous channels 11 are evenly arranged round holes or polygonal holes; the heating printed circuit 2 is surrounded and located on the outer surface of the alumina honeycomb ceramic body 1; at the first end of the heating printed circuit 2 there is a wire 3.

The density of the alumina honeycomb ceramic body 1 is 3.9 g/cm ³ .

In this case, the resistance of the alumina honeycomb ceramic body 1 is 0.6 Ω.

Here, the alumina honeycomb ceramic body 1 is a cylindrical body with a circular cross section.

The diameter of the square hole of the porous channels 11 is 1.5 mm, the side length of the square hole is 1.5 mm; the wall thickness of the porous channels 11 is 0.2 mm, as shown in figure 1, the distance between the respective sides of adjacent two square holes is the wall thickness of the porous channels 11.

In this case, the material of the heating printed circuit 2 is silver.

Here, the print thickness of the heating printed circuit 2 is 0.015 mm.

Wherein the wire 3 is a silver wire, its diameter is 0.2 mm.

Embodiment II:

As shown in Figure 1-2, the alumina honeycomb ceramic body of the present invention includes: the alumina honeycomb ceramic body 1, the heating circuit 2 and the wire 3, porous channels 11 are located in the center of the alumina honeycomb ceramic body 1, the porous channels 11 are evenly located round holes; the heating printed circuit 2 is located around the outer surface of the alumina honeycomb ceramic body 1; at the first end of the heating printed circuit 2 there is a wire 3.

The density of the alumina honeycomb ceramic body 1 is 3.9 g/cm ³ .

In this case, the resistance of the alumina honeycomb ceramic body 1 is 0.8 Ω.

At the same time, the alumina honeycomb ceramic body 1 is a cylindrical body with a circular cross section, the porous channels 11 in its center is a square hole.

The size of the round opening of the porous channels 11 is 1.5 mm; the wall thickness of the porous channels 11 is 0.2 mm, the distance between the respective sides of adjacent two round holes is the wall thickness of the porous channels 11.

In this case, the material of the heating printed circuit 2 is silver.

Here, the printing thickness of the heating printed circuit 2 is 0.02 mm.

Wherein the wire 3 is a silver wire, its diameter is 0.2 mm.

In this embodiment, the porous channels 11 are circular, compared with Embodiment I, the utilization rate of the center of the alumina honeycomb ceramic body 1 is obviously lower than Embodiment I, and its specific surface area is smaller than Embodiment I, the heating efficiency is lower than embodiment I.

The purity of the alumina honeycomb ceramic of the present invention exceeds 99%, so that the surface density of the honeycomb ceramic is very high, which can effectively prevent the adsorption of dust particles and protect against bad smell. The high purity alumina honeycomb ceramic has good thermal conductivity, the thermal conductivity is up to 33W/m*K, the wall thickness and hole diameter of the honeycomb ceramic structure is very small, with good thermal conductivity, at the same time, the shape of the honeycomb porous structure can greatly increase the air contact area, the alumina honeycomb ceramic is large, with high heating efficiency, helps to complete the purpose of air heating faster.

The ceramic honeycomb heater of the present invention is located under the sintering cigarette and does not contact with the cigarette, when the user smokes the cigarette, the air comes out of the honeycomb heater hole and is heated to a certain temperature, then the hot air passes through the cigarette, quickly heats the cigarette to 320°C. This method increases the heating area and the heating efficiency of the cigarette body, the heating is more uniform, the heating of the tobacco is more complete, it prevents waste of tobacco, improves the user's mouthfeel, and is also independent of the type of smoke cartridge. Due to the presence of a honeycomb porous structure, the air flow rate is limited to a certain extent, the contact time of hot air with a cigarette is longer, which slows down heat loss, saves energy. When there is no smoking process, the porous structure of honeycomb ceramic can block hot air at the same time, reduce the external flow of hot air, save energy even more.

An embodiment of the present invention also provides an air-heating electronic cigarette heater as shown in Figure 3, this air-heating electronic cigarette heater includes a ceramic heater 10 and a preheater 20 described in the above embodiment.

In particular, a ceramic heater 10 is disposed below the preheater 20.

Additionally, as an embodiment, the preheating device includes a preheating tube, a deflector is located between the preheating tube and the ceramic heater, and a plurality of guide holes are located on the deflector.

According to an embodiment of the present invention, the ceramic heater and the preheater are located in the sealing sleeve.

Additionally, as another embodiment for preheating, the preheating device includes a thin walled alumina ceramic tube for preheating, an empty cavity in the center of the thin walled alumina ceramic tube is used to accommodate a smoking article; a hole at one end of the thin-walled alumina ceramic tube and the bottom plate of the tube form the body of the cup, and the bottom plate has a plurality of through holes for hot air flow.

In particular, the density of the thin-walled alumina ceramic tube is not less than 3.86 g/cm ³ .

Further, as an embodiment, in the center of the bottom plate around the virtual circle, there are a plurality of hot air flow through holes, the hot air flow hole is a round hole, the hole diameter range is 0.1-2 mm.

However, the material of the bottom plate is a high purity alumina ceramic.

Specifically, as an embodiment, as shown in Figures 1-3, the air-heating electronic cigarette heater includes a preheat tube 21 and a ceramic heater 10, a ceramic heater 10 is located below the preheat tube 21; The ceramic heater 10 includes a ceramic honeycomb body 1 and a heating printed circuit 2, which is located on the ceramic heater 1, a wire 3 is located at the end of the heating printed circuit 2, honeycomb porous channels 11 are located in the ceramic honeycomb heater 1.

At the same time, a deflector 22 is located between the preheating tube 21 and the ceramic heater 10, and a plurality of guide holes 31 are located on the deflector 22.

In this case, the preheating tube 21 and the ceramic heater 10 are located in the sealing sleeve 4.

Meanwhile, the preheating tube 21, the ceramic heater 10, and the baffle 22 are made of high purity alumina ceramics.

Meanwhile, the printed materials of the heating printed circuit 2 include, but are not limited to, silver, tungsten, MoMn.

Meanwhile, the materials of the wire 3 include, but are not limited to, silver, copper, and nickel.

At the same time, honeycomb porous channels are evenly spaced round holes or polygonal holes 11, the hole diameter range is 0.1-2 mm, the minimum distance between two adjacent holes is 0.1-0.5 mm.

Further, as an embodiment, as shown in Figure 3, a ceramic heater 10 is disposed under the preheat tube 21; a deflector 22 is located between the preheating tube 21 and the ceramic heater 10, the preheating tube 21 and the ceramic heater 10 are located in the sealing sleeve 4, as shown in figure 1, the ceramic heater 10 includes a honeycomb ceramic body 1, a heating element is located on the ceramic heater 1 circuit board 2, there is a wire 3 at the end of the heating circuit board 2. When the smoker wants to smoke, he inserts the smoke cartridge into the preheating tube 21 to prevent the smoke cartridge from falling off, after the power is turned on, the heating circuit circuit 2 begins to heat up, the smoke cartridge is sintered at temperature of 280-320°C, only in this way, and active ingredients such as nicotine can be sintered and generate puff smoke, so it is necessary to preheat the device, after reaching a temperature of 200°C of the preheating tube 21 and deflector 22, finally sew preheating, after preheating is completed, at the first and second puffs, namely the first heating, the temperature rise of the smoke cartridge from 200 to 320°C is faster at room temperature. Thus, it is possible to provide a greater volume of smoke of the first and second puffs. For rapid heating, the honeycomb ceramic heater 1 has honeycomb porous channels 11, and these honeycomb porous channels are evenly spaced round holes or polygonal holes, the hole diameter range is 0.1-2mm, the minimum distance between two adjacent holes is 0. 1-0.5mm, the sweep area is large, so the air heating efficiency is very high, also the hot air exits the honeycomb center, does not contact the heating circuit board 2, and does not cause pollution. Because the preheating tube 21, the ceramic heater 10, and the baffle 22 are all made of high-purity alumina ceramic with good electrical insulation, high strength, and good thermal conductivity, the ceramic heater 10 does not leak current, the preheating tube 21, and the deflector 22 also raise temperatures quickly due to the good thermal conductivity of the high purity alumina ceramic, and the user can soon smoke tobacco; when inhaling, the air flow through the ceramic heater 10 is heated to a temperature of 320 ° C, and then passes through the guide holes 31 on the deflector 22 for further homogenization and separation of the flow, more uniform entry of the smoke cartridge into the heating tobacco to increase the volume of smoke, a good feeling of puffing during mouth, and get the best user experience. During the puffing process, some liquid contaminants emitted by the smoke cartridge will inevitably remain in the device, due to the fact that the high purity alumina ceramic has a high density, almost no pores in microstructure, the contaminants in the liquid cannot penetrate into them, cannot leave dirt and unpleasant odors on the surface. During operation, the sealing sleeve 4 plays the role of a seal, ensuring that hot air cannot enter other places.

Additionally, as another embodiment, as shown in Figure 4, a ceramic heater 10 is disposed under the preheat tube 21; the pre-heating tube 21 and the ceramic heater 10 are located in the sealing sleeve 4 as shown in figure 1, the ceramic heater 10 includes a ceramic honeycomb body 1, a heating circuit 2 is located on the ceramic honeycomb body 1, a wire 3 is located at the end of the heating circuit 2 When the smoker wants to smoke, he inserts the smoke cartridge into the preheating tube 21 to prevent the smoke cartridge from falling off, after the power is turned on, the heating circuit 2 begins to heat up, the smoke cartridge is sintered at 280-320°C, only in this way, and can sinter active ingredients such as nicotine and generate puff smoke, so it is necessary to preheat the device, after reaching the temperature of 200°C of the preheat tube 21, complete preheating, after preheating is completed, at the first and second puff, namely at the first heating, the temperature rise of the smoke cartridge from 200 to 320°C is faster at room temperature. Thus, it is possible to provide a greater volume of smoke of the first and second puffs. For rapid heating, the honeycomb ceramic heater 1 has honeycomb porous channels 11, and these honeycomb porous channels are evenly spaced round holes or polygonal holes, the hole diameter range is 0.1-2mm, the minimum distance between two adjacent holes is 0. 1-0.5mm, the sweep area is large, so the air heating efficiency is very high, also the hot air exits the honeycomb center, does not contact the heating circuit board 2, and does not cause pollution. Because the preheating tube 21, the ceramic heater 10 are made of high purity alumina ceramic with good electrical insulation, high strength and good thermal conductivity, the ceramic heater 10 does not leak current, the preheating tube 21 also raises the temperature quickly due to the good thermal conductivity of high purity alumina ceramics, and the user can soon smoke tobacco; when puffed, the air flow through the ceramic heater 10 is heated to a temperature of 320°C, when the smoker starts smoking, the heated air passes through the ceramic heater 10 and passes through the preheating tube 21, and the heated air flows into the smoke cartridge to evenly sinter the tobacco inside so that increase the volume of smoke, provides a good feeling of puff in the mouth and a better user experience. During the puffing process, some liquid contaminants emitted by the smoke cartridge will inevitably remain in the device, due to the fact that high purity alumina ceramic has a high density, almost no pores in microstructure, the contaminants in the liquid cannot penetrate through them, cannot leave dirt and unpleasant odors on the surface. During operation, the sealing sleeve 4 plays the role of a seal, ensuring that hot air cannot enter other places.

Further, as an embodiment, as shown in Figure 5, a ceramic heater 10 is disposed under the preheat tube 21; a deflector 22 is disposed between the preheating tube 21 and the ceramic heater 10, as shown in Figure 1, the ceramic heater 10 includes a honeycomb ceramic body 1, a heating printed circuit 2 is disposed on the ceramic heater 1, a wire 3 is disposed at the end of the heating printed circuit 2, when the smoker wants to smoke, he inserts the smoke cartridge into the preheating tube 21 to prevent the smoke cartridge from falling, after the power is turned on, the heating circuit 2 begins to heat up, the smoke cartridge is sintered at 280-320°C, only in this way can the active ingredients be sintered such as nicotine, and generate smoke for a puff, so it is necessary to preheat the device, after reaching the temperature of 200°C of the preheat tube 21 and deflector 22, complete preheating, after preheating is completed, at the first and second puff, and they Especially during the first heating, the temperature rise of the smoke cartridge from 200 to 320°C is faster at room temperature. Thus, it is possible to provide a greater volume of smoke of the first and second puffs. For rapid heating, the honeycomb ceramic heater 1 has honeycomb porous channels 11, and these honeycomb porous channels are evenly spaced round holes or polygonal holes, the hole diameter range is 0.1-2mm, the minimum distance between two adjacent holes is 0. 1-0.5mm, the sweep area is large, so the air heating efficiency is very high, also the hot air exits the honeycomb center, does not contact the heating circuit board 2, and does not cause pollution. Because the preheating tube 21, the ceramic heater 10, and the baffle 22 are all made of high-purity alumina ceramic with good electrical insulation, high strength, and good thermal conductivity, the ceramic heater 10 does not leak current, the preheating tube 21, and the deflector 22 also quickly raise the temperature due to the good thermal conductivity of the high purity alumina ceramic, and the user can soon smoke tobacco; when tightening, the air flow through the ceramic heater 10 is heated to a temperature of 320 ° C, and then passes through the guide holes 31 on the deflector 22 for further homogenization and separation of the flow, more uniform entry of the smoke cartridge into the heating tobacco to increase the volume of smoke, provide a good feeling of inhaling in the mouth, the best user experience. During the puffing process, some liquid contaminants emitted by the smoke cartridge will inevitably remain in the device, due to the fact that the high purity alumina ceramic has a high density, almost no pores in microstructure, the contaminants in the liquid cannot penetrate into them, cannot leave dirt and unpleasant odors on the surface.

As an embodiment, as shown in Figure 7, the preheating device includes a thin-walled alumina ceramic tube 21 for preheating, an empty cavity 210 in the center of the thin-walled alumina ceramic tube 21 is used to house a smoking article, a hole at one end of the thin-walled alumina ceramic tube 21 and the bottom plate 23 form a cup body, the bottom plate 23 is provided with a plurality of hot air flow through holes 32; the density of the thin-walled alumina ceramic tube 21 is not less than 3.86 g/cm ³ , the thin-walled alumina ceramic tube 21 is a hollow round tube, its wall range is 0.2 mm; the shape of the bottom plate 23 corresponds to the shape of the hole in the cross section of the thin-walled alumina ceramic tube 21; in the center of the bottom plate 23 around the virtual circle, 8 hot air flow through holes 32 are uniformly arranged, the hot air flow hole 32 is a round hole, the hole diameter range is 1.5 mm; the thickness of the bottom plate 23 is 0.2 mm; the material of the bottom plate 23 is a high purity alumina ceramic.

In particular, the purity of the ultra-fine alumina honeycomb ceramic exceeds 99%, so that the surface of the honeycomb ceramic has a high density, can effectively prevent the adsorption of dust particles and protect against bad smell. High purity ultra-thin alumina honeycomb ceramic has good thermal conductivity, thermal conductivity up to 33W/m*K, with high heating efficiency, helps to achieve the purpose of heating the air in the empty cavity for preheating 210 faster.

The pre-heating device is installed above the air heating element, for example, above the ceramic heater 10, when heating the heating element, because the bottom plate 23 and thin-walled alumina ceramic tube 21 are made of high purity ultra-thin alumina ceramic, they can quickly heat up for preheating the empty cavity 210. The thin-walled alumina ceramic tube 21 is not used as a conventional heater, which can reduce heat loss. In the heating circuit in the relevant field of technology, the ceramic heating tube directly sinters the smoking product, the heating circuit is printed on the outer surface of the ceramic heating tube, when the power is turned on, the high temperature of the ceramic heating tube itself sinters the smoking product, this method has a low heat utilization rate, when sintering tobacco during sintering, a large amount of heat is generated, which is uneconomical and not environmentally friendly. In the embodiment of the present invention, the heating of the smoking article is performed by the puffing action of the user, hot air is discharged from the heating part under the hot air flow hole 32 to sinter the smoking article, good sintering effect and uniform sintering is achieved, on the one side the hot air supply hole air can facilitate the circulation of hot air, on the other hand, it prevents the direct diffusion of hot air without puffing action, has the effect of thermal insulation. High purity alumina ceramic material has good density, reduces the adsorption of flue dust particles, no bad smell, so the use is safer.

In addition, the embodiment of the present invention also provides a method for manufacturing a ceramic heater, and a method for manufacturing a ceramic heater includes the following steps:

Step I: Preparation of the alumina ceramic mass: add the following to the powder of nanometer alumina by weight part 100: magnesium nitrate by weight part 0.01-0.05, zirconium oxychloride by weight part 0.01-0.05, yttrium nitrate by weight part 0.01 -0.05, oleic acid by weight part 1.5-2.5, lubricant by weight part 1-2, binder by weight part 3-15, also deionized water by weight part 10-30, place them in the mixer, at a temperature below 30°C mix 1-5 hours, prepare a mass of alumina honeycomb ceramics with a uniform distribution and a solids content of 75-85% for subsequent use;

Step II: Forming the alumina honeycomb ceramic: add the alumina honeycomb ceramic mass prepared in step I to the screw extrusion molding machine with vacuum air bubble removal device, the ceramic mass is extruded through the die head by pushing the screw into hollow thin-walled honeycomb ceramic blanks;

Step III: drying alumina honeycomb ceramic blanks: transfer the ceramic blanks prepared in step II into the furnace, under hot air conditions at 40-50°C, dry and dehydrate for 5-10 minutes, obtain ceramic blanks that meet the requirements for appearance and straightness.

Step IV: Adhesive Removal of Alumina Unfired Ceramics: Pre-fire unfired ceramics prepared in step III at 1100-1200°C to obtain pre-fired ceramic blanks;

Step V: firing of alumina honeycomb ceramics: put pre-fired ceramic blanks obtained in step IV into a high-temperature molybdenum tube, fire them in hydrogen or directly in air at 1600-1800°C, obtain alumina honeycomb ceramics;

Step VI: fabrication of the heating printed circuit on the surface of the alumina honeycomb ceramics: using screen printing technique, printing thick-film thermoelectrode wire on the outer surface of the alumina honeycomb ceramics prepared in step V, after drying the printed circuit, silver solder coating on the contact pad to adhere the wire, again placing them in an oven to dry, then moving them to an oven at 800-1500°C for firing, getting a built-in fired wire and a printed circuit, while making silver solder wire in the furnace.

Meanwhile, the purity of the nanometer alumina used in step I is greater than or equal to 99.99%, the particle size is 350 nm, and the specific surface area is 7 m ² /g.

According to an embodiment of the present invention, the above method for manufacturing an alumina ceramic honeycomb heater includes the following steps:

Step I: Preparation of the mass of alumina ceramic tube: add nanometer alumina powder 100 parts by weight, Mg(NO ₃ ) ₂ •6H ₂ O 0.04 parts by weight, ZrOCl ₂ •8H ₂ O 0.04 parts by weight, Y(NO ₃ ) ₃ •6H ₂ O 0.01, oleic acid 2.4% by weight, polyethylene glycol 600 by 1.2% by weight, high purity ethyl cellulose ether by 14% by weight, also deionized water by 12% by weight, place them in the mixer, at a temperature below 30°C mix 5 hours, prepare a mass of alumina honeycomb ceramics with a uniform distribution and a solids content of 75% for later use;

Step II: Forming the alumina honeycomb ceramic: add the alumina honeycomb ceramic mass prepared in step I to the screw extrusion molding machine with vacuum air bubble removal device, the ceramic mass is extruded through the die head by pushing the screw into hollow thin-walled honeycomb ceramic blanks;

Step III: Drying of the alumina honeycomb ceramic blanks: transfer the ceramic blanks prepared in step II to the oven, under hot air conditions at 49°C, dry and dehydrate for 5 minutes, obtain ceramic blanks that meet the requirements for appearance and straightness.

Step IV: Adhesive Removal of Alumina Unfired Ceramics: Pre-fire unfired ceramics prepared in step III at 1190°C to obtain pre-fired ceramic blanks;

Step V: firing of alumina ceramics: put pre-fired ceramic blanks obtained in step IV into a high-temperature molybdenum tube, fire them in hydrogen or directly in air at 1650°C, obtain alumina honeycomb ceramics;

Step VI: fabrication of the heating printed circuit on the surface of the alumina honeycomb ceramics: using screen printing technique, printing thick-film thermoelectrode wire on the outer surface of the alumina honeycomb ceramics prepared in step V, after drying the printed circuit, silver solder coating on the contact pad to adhere the wire, placing them again in an oven for drying, then transferring them to a constant pressure hydrogen furnace at 800°C for firing, obtaining a heating element of an alumina honeycomb ceramic body co-fired with wire, while performing silver soldering of the wire in the furnace.

Meanwhile, the purity of the nanometer alumina used in step I is greater than or equal to 99.99%, the particle size is 350 nm, and the specific surface area is 7 m ² /g.

The density of the alumina honeycomb ceramic body is 3.9 g/cm ³ .

In this case, the resistance of the alumina honeycomb ceramic body is 0.6 ohms.

At the same time, the alumina honeycomb ceramic body is a cylindrical body with a round cross section, the porous channels in its center are evenly spaced square holes.

In this case, the diameter of the square hole of the porous channels is 1.5 mm, the length of the side of the square hole is 1.5 mm; the wall thickness of the porous channels is 0.2 mm, as shown in figure 1, the distance between the respective sides of adjacent two square holes is the wall thickness of the porous channels.

Herewith, the material of the heating printed circuit – silver.

At the same time, the printing thickness of the heating printed circuit is 0.015 mm.

In this case, the wire is a silver wire, its diameter is 0.2 mm.

According to another embodiment of the present invention, the above method for manufacturing an alumina ceramic honeycomb heater includes the following steps:

Step I: Preparation of the mass of alumina ceramic tube: adding to the powder nanometer alumina 100 weight part, Mg(NO ₃ ) ₂ • 6H ₂ O 0.02 weight part, ZrOCl ₂ •8H ₂ O 0.05 weight part, Y(NO ₃ ) ₃ • 6H ₂ O 0.015% by weight, oleic acid 2% by weight, polyethylene glycol 600 by 1.5% by weight, high purity ethyl cellulose ether by 8% by weight, also deionized water by 20% by weight, placing them in a mixer, mixing at a temperature below 30 °C 5 hours, preparation of a mass of alumina honeycomb ceramics with a uniform distribution and a solids content of 78% for subsequent use;

Step II: Forming the alumina honeycomb ceramic: add the alumina honeycomb ceramic mass prepared in step I to the screw extrusion molding machine with vacuum air bubble removal device, the ceramic mass is extruded through the die head by pushing the screw into hollow thin-walled honeycomb ceramic blanks;

Step III: Drying of the alumina honeycomb ceramic blanks: transfer the ceramic blanks prepared in step II to the oven, under hot air conditions at 49°C, dry and dehydrate for 5 minutes, obtain ceramic blanks that meet the requirements for appearance and straightness.

Step IV: Adhesive Removal of Alumina Unfired Ceramics: Pre-fire unfired ceramics prepared in step III at 1190°C to obtain pre-fired ceramic blanks;

Step V: firing of alumina ceramics: put pre-fired ceramic blanks obtained in step IV into a high-temperature molybdenum tube, fire them in hydrogen or directly in air at 1650°C, obtain alumina honeycomb ceramics;

Step VI: fabrication of the heating printed circuit on the surface of the alumina honeycomb ceramics: using screen printing technique, printing thick-film thermoelectrode wire on the outer surface of the alumina honeycomb ceramics prepared in step V, after drying the printed circuit, silver solder coating on the contact pad to adhere the wire, placing them in a drying cabinet for drying, then transferring them to a constant pressure hydrogen furnace at 800°C for firing, obtaining a heating element co-fired with a wire alumina honeycomb ceramic body, at the same time making silver solder wire in the furnace.

Meanwhile, the purity of the nanometer alumina used in step I is greater than or equal to 99.99%, the particle size is 350 nm, and the specific surface area is 7 m ² /g.

The density of the alumina honeycomb ceramic body is 3.9 g/cm ³ .

In this case, the resistance of the alumina honeycomb ceramic body is 0.8 ohms.

At the same time, the alumina honeycomb ceramic body is a cylindrical body with a round cross section, the porous channels in its center are evenly spaced square holes.

In this case, the diameter of the square hole of the porous channels is 1.5 mm, the length of the side of the square hole is 1.5 mm; the wall thickness of the porous channels is 0.2 mm, as shown in figure 1, the distance between the respective sides of adjacent two square holes is the wall thickness of the porous channels.

Herewith, the material of the heating printed circuit – silver.

At the same time, the print thickness of the heating printed circuit is 0.02 mm.

In this case, the wire is a silver wire, its diameter is 0.2 mm.

The purity of the alumina honeycomb ceramics prepared by the manufacturing method according to the embodiment of the present invention exceeds 99%, so that the surface of the honeycomb ceramics has a high density, can effectively prevent the adsorption of dust particles and protect against bad odor. The high purity alumina honeycomb ceramic has good thermal conductivity, the thermal conductivity is up to 33W/m*K, the wall thickness and hole diameter of the honeycomb ceramic structure is very small, with good thermal conductivity, at the same time, the shape of the honeycomb porous structure can greatly increase the air contact area, the alumina honeycomb ceramic is large, with high heating efficiency, helps to complete the purpose of air heating faster.

The honeycomb ceramic heater of the present invention is located under the sintering cigarette and does not contact with the cigarette, when the user smokes the cigarette, the air exits the honeycomb hole of the heater heated to a certain temperature, then the hot air passes through the cigarette, quickly heats the cigarette to 320°C. This method increases the heating area and the heating efficiency of the cigarette body, the heating is more uniform, the sintering of the tobacco is more complete, it prevents waste of tobacco, improves the mouthfeel of the user, and is also independent of the type of smoke cartridge. Due to the presence of a honeycomb porous structure, the air flow rate is limited to a certain extent, the contact time of hot air with a cigarette is longer, which slows down heat loss, saves energy. When there is no smoking process, the porous structure of honeycomb ceramic can block hot air at the same time, reduce the external flow of hot air, save energy even more.

Although the embodiments of the present invention have been indicated and described above, it can be understood that the above embodiments cannot be understood as limiting the present invention, a person of ordinary skill in the art may change, amend, replace and modify the above embodiments.

Claims (20)

1. A ceramic heater containing a honeycomb ceramic body and a heating printed circuit, characterized in that the honeycomb ceramic body is provided with a section with channels made in the form of round or polygonal holes; a heating printed circuit is disposed around the outer surface of the honeycomb ceramic body to heat the air passing through the ducted portion. 2. Ceramic heater according to claim. 1, characterized in that the honeycomb ceramic body is an alumina honeycomb ceramic body, and the density of the alumina honeycomb ceramic body is not less than 3.86 g/cm ³ . 3. Ceramic heater according to claim 1, characterized in that the channels are evenly distributed in the honeycomb ceramic body. 4. Ceramic heater according to claim 1, characterized in that the channels are located in the center of the honeycomb ceramic body. 5. Ceramic heater according to any one of paragraphs. 1-4, characterized in that the honeycomb ceramic body is a cylindrical body with a round or polygonal cross section. 6. Heater electronic cigarettes with air heating, containing a ceramic heater according to any one of paragraphs. 1-5 and a preheating device under which a ceramic heater is located. 7. The air heated electronic cigarette heater according to claim 6, characterized in that the preheating device includes a preheating tube, a baffle is placed between the preheating tube and the ceramic heater, on which a plurality of guide holes are located. 8. An electronic cigarette heater with air heating according to claim 6, characterized in that the ceramic heater and the preheating device are located in the sealing sleeve. 9. An electronic cigarette heater with air heating according to claim 6, characterized in that the preheating device includes a thin-walled alumina ceramic tube for preheating, while an empty cavity in the center of the thin-walled alumina ceramic tube is configured to accommodate a smoking product, an opening on one the end of the thin-walled alumina ceramic tube and the bottom plate form the cup body, and the bottom plate has a plurality of through holes for hot air flow. 10. An electronic cigarette heater with air heating according to claim 9, characterized in that the density of the thin-walled alumina ceramic tube is not less than 3.86 g/cm ³ . 11. The electronic cigarette heater with air heating according to claim 9, characterized in that in the center of the bottom plate, a plurality of through holes for the flow of hot air are uniformly arranged in a circle, while the hole for the flow of hot air is a round hole with a diameter of 0.1-2 mm . 12. The air heating electronic cigarette heater according to claim 9, characterized in that the bottom plate material is a high purity alumina ceramic. 13. A method of manufacturing a ceramic heater according to any one of paragraphs. 1-5, characterized in that it includes the following steps: step I: preparation of the mass of alumina ceramics: addition of magnesium nitrate 0.01-0.05 weight part, zirconium oxychloride 0.01-0.05 weight part, yttrium nitrate 0.01-0.05 weight part, oleic acid 1 weight part ,5-2.5, lubricant by weight part 1-2, binder by weight part 3-15 and deionized water by weight part 10-30 into nanometer alumina powder by weight part 100, placing them in a mixer, mixing at a temperature below 30 ° C for 1-5 hours, preparing a mass of alumina honeycomb ceramic with a uniform distribution and a solids content of 75-85% for subsequent use; step II: molding the alumina honeycomb ceramic: adding the alumina honeycomb ceramic body prepared in step I to a screw extrusion molding machine with a vacuum air bubble removal device, extruding the ceramic body through the die head by pushing the screw into hollow thin-walled honeycomb ceramic blanks; Step III: Drying the alumina honeycomb ceramic blanks: transfer the ceramic blanks prepared in step II to the oven, dry in hot air at 40-50°C, and degrade for 5-10 minutes, obtain ceramic blanks that meet the requirements for external appearance and straightness. step IV: removing the adhesive of the alumina green ceramics: pre-firing the green ceramics prepared in step III at a temperature of 1100-1200°C, obtaining pre-fired ceramic blanks; step V: firing of alumina honeycomb ceramics: placing the pre-fired ceramic blanks obtained in step IV into a high-temperature molybdenum tube, firing them in hydrogen or directly in air at 1600-1800°C, obtaining alumina honeycomb ceramics; step VI: fabrication of a heating printed circuit on the surface of the alumina honeycomb ceramics: using screen printing technique, printing a thick-film thermoelectrode wire on the outer surface of the alumina honeycomb ceramics prepared in step V, after drying the printed circuit, silver solder coating on the contact pad to attach the wire, placing them in an oven for drying, then transferring them to an oven at 800-1500°C for firing, obtaining whole-sintered wire and printed circuit, while making silver solder wire in the furnace. 14. A method for manufacturing a ceramic heater according to claim 13, characterized in that the purity of the nanometer alumina used in step I is greater than or equal to 99.99%, while the particle size is 350 nm, and the specific surface area is 7 m ² /g .

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