Patent Description:
Tobaccos are burned to produce tobacco smoke when smoking products such as cigarettes and cigars are used. Smoke generated by tobacco burning contains many carcinogens like tar, which may do great harm to the human body in case of long-term inhalation. With the technological advancements, people have a pursuit for a healthy life. Therefore, heat not burn products are developed to replace the cigarettes. One of the typical heat not burn solutions is to provide an alternative to these types of products by producing products that release compounds without burning. One example of such products is the so-called heat not burn product, also known as a tobacco heating product or a tobacco heating device, which releases compounds by heating but not burning the material.

With regard to the heat not burn products currently available on the market, the heating and braking technology applied conducts heat transfer and exchange by way of heat transfer.

<CIT> discloses a hot -blast formula pottery heating element component, wherein, ceramic heating element component has multiple compound mode: first kind of compound mode comprises ceramic heating tube, the pottery heating tube generates heat alone, second kind compound mode is generated heat excellent core by ceramic heating tube and pottery and is constituted, pottery heating tube and pottery generate heat excellent core and generate heat jointly, the tertium genus compound mode is generated heat excellent core by ceramic pipe and pottery and is constituted, the pottery generates heat excellent core and generates heat, and the ceramic pipe does not generate heat. The pottery generates heat excellent core and establishes inside ceramic heating tube or ceramic pipe, the ceramic pipe is inside vertically to be passed through a through-hole structure or vertically link up the honeycomb type cavernous structure for there are a plurality of vertical perforating holes and a vertical through circular holes in centre cylindrical structure or horizontal opening intercommunication in the centre. The beneficial effects of the utility model are that: it is efficient to generate heat, long service life, and stable in structure, safety ring protects.

<CIT> discloses a ceramic heat -generating body for electron cigarette tobacco -baking equipment relates to electron cigarette accessory technical field, include the ceramic body that is the hollow shape of upper end open -ended, the inner wall fixedly connected with of ceramic body centres on ceramic body evenly distributes the piece that generates heat, and the both ends of the piece that generates heat are installed the lead wire respectively and are gone between and extend the ceramic body, and a plurality of inlet ports have been offered to the downside wall body of ceramic body, piece evenly distributed is at the inner wall of ceramic body owing to generate heat, consequently makes to generate heat the piece at the in -process that progressively generates heat, and heat transfer is to the outer ceramic body, and heat transfer is fast, ceramic inner wall through the ceramic body heats cigarette, can make the pipe tobacco in the cigarette be heated evenly, the constancy of temperature, greatly increased the taste and the stability of electronics cigarette flue -cured tobacco, the not direct contact pipe tobacco of piece owing to generate heat to can prolong the life of the piece that generates heat.

<CIT> discloses a heating device and a smoking set. This heating device includes:
the chimney for it to accept the cigarette, the chimney bottom is equipped with the air vent, the heating body, set up in outside the chimney, the heating body include sleeve and a plurality of parallel arrangement in heating plate in the sleeve, the heating plate is equipped with a plurality of air current holes, telescopic one end orientation the bottom of chimney. Consequently, heating plate among the heating device in the sleeve will heat the air of chimney bottom side, and when the user absorbed cigarette, during air that the quilt of chimney bottom side heats will get into cigarette through the air vent of chimney bottom, the hot-air got into the back from the one end of cigarette, follows the other end that the cigarette propped up again and wears out to with solid cigarette atomizing, supply the user to suck uniformly, guarantee better smoking taste, promote user experience.

<CIT> discloses a composite ceramic atomizer, comprising a first main body and a second main body, wherein the first main body and the second main body are integrally formed by using a glazing and sealing process, and the first main body is connected to the second main body by means of a glazed surface formed by glazing. The glazed surface completely or partially covers a surface at the joint between the first main body and the second main body. The first main body comprises a heating carrier and a conductive path for heating, the conductive path being formed on a surface of or inside the heating carrier and having a first contact part and a second contact part connected to a power supply. The second main body is used for liquid conduction. Further provided is a method for preparing the composite ceramic atomizer, the method involving sealing and integrally forming a porous ceramic material and a heating ceramic material by means of a glazing and firing process. The composite ceramic atomizer has a high strength and a long service life.

<CIT> discloses a preparation method of a porous ceramic, the porous ceramic, and a use thereof in the electronic cigarette. The method of preparing a porous ceramic includes: mixing amorphous silica, aluminium oxide and iron oxide uniformly to obtain a mixture; sintering the mixture at a temperature of <NUM>° C. to <NUM>° C. for <NUM> hour to <NUM> hours to obtain a precursor; grinding the precursor to obtain precursor powder; mixing the precursor powder, sodium silicate, and porogen uniformly to obtain a premix; mixing and extruding the premix with water to obtain a moulded body; and heat preserving the moulded body at a temperature of <NUM>° C. to <NUM>° C. for <NUM> hour to <NUM> hours, and sintering the moulded body at a temperature of <NUM>° C. to <NUM>° C. for <NUM> hour to <NUM> hours to obtain the porous ceramic.

The existing heating methods include sheet heating (needle heating) and tubular heating, for example, "a smoking product used together with an internal heating component" disclosed by <CIT>, which adopts sheet heating (needle heating); but this heating method has an disadvantage that the centre temperature is high and the surrounding is relatively low, so the tobacco that is close to the sheet heating element is fully carbonized and even scorched while the tobacco in the surroundings has not been carbonized, this may result in tobacco wasting; for another example, "electrically heated smoke system with an internal or external heating device" disclosed by <CIT>, which adopts tubular heating, in tubular heating, the tobacco close to the tube wall is fully carbonized while the tobacco in the centre cannot be fully carbonized, in this case, if the temperature is increased, the cigarette paper may be scorched, which will affect the taste. To sum up, the current heating device has the technical defects of uneven baking, small smoke emission, light taste, and poor user experience, and a contaminant produced by long-time smoking of a heat not burn product will attach to the product, which will bring in odd smell.

The present invention is created based on the inventor's in-depth research and continuous experiments on the following issues:
In the related art, the heat not burn product mainly comprises the following three types of heating components:.

The ceramic heating sheet is made of zirconia ceramic substrate + precious metal heating slurry, which is characterized in small size, light weight, accessible high power density, and high thermal efficiency; with excellent thermal characteristics and fast heating speed, it allows for any temperature distribution; it has high reliability and long service life, and excellent acid and alkali resistance; besides, the heating element material will not be oxidized; it also has the advantages of corrosion resistance, high temperature resistance, uniform temperature, good thermal conductivity, and fast thermal compensation.

However, when a ceramic heating sheet is used to heat a smoking product, centre heating will cause uneven temperature distribution over the whole heating element, and the temperature difference between the top and the bottom can be about <NUM>, which may result in insufficient baking of the tobacco or even a smell of scorching, and large waste of tobacco, apart from that, it may need to use a special cartridge and a sheet heating element to achieve the desired effect, so the scope of application is restrained.

The rod type heating element has high strength and will not be broken; when being heated at high temperature, the ceramic heating element shows good compactness, the heating wire is completely wrapped in the ceramic, and the reliability is high in long-term use; <NUM> silver brazing process is applied, so the solder joints are stable and able to withstand high temperature of <NUM> for long.

However, when the heating wire is used to heat the rod body through the heating wire, the heating wire needs to reach a high temperature to achieve the heating effect, so the heat exchange efficiency is low, and due to high temperature of the heating wire, it may cause the metal ions separated from the heating wire to enter human body by mixing into the smoking airflow, which may endanger the human health.

Heating cup\heating tube\heating pot are typical examples of surrounding heating. Circular segmented heating, precise temperature control. But this method has the biggest problem of low heat utilization rate, a part of the heat is absorbed by the tobacco, and the other part is subjected to heat dissipation. If heat preservation is not effective, the smoking set will be hot and affect the user's use.

As mentioned above, a contact type heating and baking technology mainly conducts heat transfer and exchange by way of heat transfer, that is, a heating conductor (such as a ceramic heating element or pin) conducts temperature to the object baked (smoking product). This heating method mainly has two disadvantages of: <NUM>. The baked object (smoking product) has poor thermal conductivity and cannot fully transfer the temperature, which causes uneven baking of the inner and outer side; <NUM>. Various types of objects to be baked have largely different space densities, if a different type of object is baked, it is difficult to guarantee the heating and baking effect, and good effect can only be achieved by using a matching baked object, so the adaptability is poor. To conclude, this type of heating device has technical defects such as uneven baking, small smoke emission, light taste, and poor user experience, which severely restrict the further development and popularized application of the field.

For this purpose, the inventor of the present application has found through a number of research and experiments that smoking itself is a process of air flow, if the air flowing into the smoking product is under relatively high temperature, the hot air can directly act to bake the smoking product; and because the hot air can evenly penetrate into all the tobacco of the baked smoking product with the suction process relatively completely and uniformly, the concern of uneven heating will be effectively solved. Therefore, the smoking product is baked by heating the air and then using the hot air flow during the smoking process to achieve heating, this scheme can achieve good overall heating effect.

However, when the air heating scheme is adopted, first it is necessary to select a suitable heating element to heat the air, and when the heating element heats the air, room temperature air needs to enter the heating element, and the temperature of air should reach <NUM> or above after flowing out of the heating element; second, some general smoking habits have to be considered, that is, about <NUM> per second must be ensured during temperature rise, and each puff lasts for about <NUM> seconds, and the heating element needs a total heating efficiency of about <NUM> air.

To achieve the above effect, the inventor has learned through a lot of experiments that when a heating wire is used to heat the air, the heating wire should have high temperature, and only when the temperature of the heating wire is up to <NUM> or above, it can heat the air flowing through to more than <NUM>, and the heating wire will cool quickly as long as air flows by, in this way, each puff of smoking will make the temperature of the heating wire drop by <NUM>-<NUM>. Therefore, the heating wire needs power compensation during smoking, otherwise it may be difficult to guarantee air heating required for smoking; while, power compensation is performed for the heating wire based on the air flow detected by an air flow sensor, due to small contact area between heating wire and air, this power compensation scheme not only needs high power to achieve the required heating effect, but also has the problem of inaccurate gas temperature after heating, untimely compensation response, which may cause uneven temperature in all directions.

In addition, when heating the flow air to above <NUM> by increasing the temperature of the heating wire, the increased temperature of the heating wire may cause the metal ions separated by the heating wire to enter human body by mixing into the smoking airflow, which will endanger the human health.

For the above, the inventor of the present application has concluded through a lot of research that when air heating is used to bake a smoking product, the heating element used to heat the air needs to have a large heating area so as to reduce the temperature difference between the heating element and the air; the heating element also needs high heat capacity to resist against the temperature drop caused after the smoking airflow passes, and high thermal conductivity to reduce the heating preparation time.

For this purpose, the applicant found based on in-depth research on ceramics for years that a larger heating surface area can be obtained by designing a porous structure of the honeycomb ceramics, so that the heating element will have a high air heating efficiency, and the honeycomb ceramic heating element of porous structure is closer to a solid structure and has a higher heat capacity than a ceramic tube of the same size; in addition, the thermal conductivity of alumina material is greater than 30W/MK, which can make the heat conduction faster and more uniformly, thereby obtaining high thermal conductivity. Therefore, the honeycomb ceramic heating element of porous structure can meet the requirement of baking the smoking product by heating air.

The first purpose of the present invention is to provide a ceramic heating element, which is characterized in quick and uniform temperature rising, large heating surface, low power consumption, long service life, and good heat preservation.

In accordance with the present invention there is provided ceramic heating element comprising a honeycomb ceramic body, wherein porous channels are arranged in the honeycomb ceramic body, and the porous channels are circular holes or polygonal holes; and
a heating printed circuit, wherein the heating printed circuit is arranged around the outer surface of the honeycomb ceramic body to heat the air passing through the porous channels, wherein the honeycomb ceramic body is an alumina honeycomb ceramic body, and the alumina honeycomb ceramic body has a density being not less than <NUM>/cm<NUM>, the porous channels being uniformly distributed in the honeycomb ceramic body.

Optionally, the porous channels are arranged in the centre of the honeycomb ceramic body.

Optionally, the honeycomb ceramic body is a cylinder with a circular or polygonal cross section.

Specifically, an alumina honeycomb ceramic heating element proposed by an embodiment of the present invention, comprises an alumina honeycomb ceramic body, a heating printed circuit, and a wire; porous channels are arranged in the centre of the alumina honeycomb ceramic body; and the porous channels are evenly arranged circular or polygonal holes; the heating printed circuit is arranged around the outer surface of the alumina honeycomb ceramic body; and a wire is arranged at a first end of the heating printed circuit.

Further, the resistance of the alumina honeycomb ceramic body is <NUM>.

Further, the alumina honeycomb ceramic body is a cylinder with a circular, square or polygonal cross section.

Further, the pore diameter of the porous channels is within <NUM> -<NUM>; the wall thickness of the porous channels is <NUM> -<NUM>.

Further, materials of the heating printed circuit include but are not limited to silver, tungsten, MoMn, and may be any one of other suitable printed circuit materials.

Further, the printing thickness of the heating printed circuit is <NUM> to <NUM>.

Further, materials of the wire include but are not limited to copper, silver, and nickel, and the diameter is <NUM> -<NUM>.

According to a ceramic heating element of an embodiment of the present invention, the surface made of high purity alumina honeycomb ceramic has high compactness, it is able to effectively prevent absorption of smoke dust particles, thus to effectively preventing odd smell. The high-purity alumina honeycomb ceramic has good thermal conductivity, with a thermal conductivity of 33W/mk; the wall thickness and pore diameter in the honeycomb ceramic structure are both very small, and the thermal conductivity is extremely excellent; the shape of the honeycomb porous can greatly increase the contact area with air, the alumina honeycomb ceramics has large specific area, and high heating efficiency, which is favorable for quickly heating the air. The honeycomb ceramic heating body of the present invention is arranged below a heat not burn product to be baked without contacting; when the user smokes the heat not burn, the air heated by the honeycomb ceramic heating body at the bottom gets into contact with the heat not burn and heat the heat not burn quickly and uniformly; due to the honeycomb porous structure, the air flow rate is restricted to some extent, and the contact time between the hot air and the heat not burn is prolonged, which slows the heat loss and saves energy. When there is no smoking action, the porous honeycomb ceramic can lock the hot air while reducing the outflow of hot air, which will further save energy.

A second purpose of the present invention is to provide an air-heating type heat not burn heating device that can be baked uniformly and will not pollute the product due to a pollutant in fluid or direct-contact of a heating element with a cartridge.

To fulfill this purpose, the air-heating type heat not burn heating device provided by the present invention comprises the ceramic heating element described above; and a preheating device, wherein the ceramic heating element is arranged below the preheating device.

Optionally, the preheating device comprises a preheating tube, a deflector is arranged between the preheating tube and the ceramic heating element, and a plurality of guide holes are arranged on the deflector.

Optionally, the ceramic heating element and the preheating device are arranged in a sealing sleeve.

Optionally, the preheating device comprises a thin-wall alumina ceramic tube for preheating, a cavity in the centre of the thin-wall alumina ceramic tube is used for placing a smoking product, and an opening at one end of the thin-wall alumina ceramic tube and a base plate forms a cup body, and a plurality of hot air flow holes are arranged on the base plate.

Optionally, the thin-wall alumina ceramic tube body has a density not less than <NUM>/cm<NUM>.

Optionally, a plurality of hot air flow holes are uniformly arranged around a virtual circle in the centre of the base plate, and the hot air flow holes are circular holes with a diameter ranging from <NUM> to <NUM>.

Optionally, the base plate is made of high-purity alumina ceramics.

In one embodiment of the present invention, the air-heating heat not burn heating device comprises a preheating tube and a ceramic heating element, and the ceramic heating element is arranged under the preheating tube; the ceramic heating element comprises a honeycomb ceramic body and a heating printed circuit arranged on the honeycomb ceramic body, a wire is arranged at an end of the heating printed circuit, and honeycomb porous channels are arranged in the ceramic heating body.

Further, the preheating tube, ceramic heating element and deflector are all made of high-purity alumina ceramics.

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

Further, the wire material includes but is not limited to silver, copper, and nickel.

Further, the honeycomb porous channels are uniformly arranged circular holes or polygonal holes, with a pore diameter ranging from <NUM> to <NUM>, and the minimum distance between two adjacent holes within <NUM> - <NUM>.

According to the air-heating heat not burn heating device of the present invention, the air is heated by the heating element, and then the heated flow air evenly bakes the tobacco, in order to achieve the effects of increasing the smoke emissions, creating good smoking taste, and good user experience. The preheating tube, ceramic heating element and deflector are all made of high-purity alumina ceramics, wherein the high-purity alumina ceramics feature high compactness and almost have no pores in microstructure, so penetration of contaminants in the fluid is impossible, and no pollution and odd smell will be left on the surface; and it can ensure that the device is not contaminated as the air heating method does not contact with the cartridge.

In addition, the preheating device can achieve quick and uniform temperature rise, thus to exert the function of preheating and heat preservation.

The preheating device comprises a thin-wall alumina ceramic tube for preheating, a cavity in the centre of the thin-wall alumina ceramic tube is used for placing smoking product; an opening at one end of the thin-wall alumina ceramic tube and a base plate forms a cup body, and a plurality of hot air flow holes are arranged on the base plate.

Further, the alumina ceramic tube body has a density not less than <NUM>/cm<NUM>.

Further, the thin-wall alumina ceramic tube is a thin-wall alumina ceramic hollow circular tube, with the wall thickness ranging from <NUM> to <NUM>.

Further, the shape of the base plate matches with the opening section of the thin-wall alumina ceramic tube.

Further, a plurality of hot air flow holes are uniformly arranged around a virtual circle in the centre of the base plate, and the hot air flow holes are circular holes with a diameter ranging from <NUM> to <NUM>.

Further, the thickness of the base plate is within <NUM>-<NUM>.

Further, the base plate is made of high-purity alumina ceramics.

The preheating device is installed above the air heating element, when the heating element is heated, it can be quickly heated up to preheat the cavity as the base plate and the thin-wall alumina ceramic tube are both made of ultra-thin high-purity alumina ceramics. The thin-wall alumina ceramic tube is not used as a traditional heating component, which can reduce heat loss. Heating the smoking product is achieved by the user's smoking action, and hot air is extracted from the heating component under the hot air flow hole to bake the smoking product, the baking effect is good and the baking is uniform. On one hand, the hot air flow hole can facilitate the circulation of hot air; on the other hand, direct diffusion of hot air is prevented when no one smokes, thus to achieve heat preservation. The high-purity alumina ceramic material has good compactness, which will reduce the absorption of smoke dust particles, generate no odd smell, it is therefore safer to use.

A third purpose of the present invention is to provide a preparation method of the ceramic heating element.

In order to fulfill this purpose, a preparation method of the ceramic heating element proposed in the present invention comprises the following steps:.

Optionally, the nano alumina powder used in step <NUM> has a purity of <NUM>% or above, a particle size of <NUM>, and a specific surface area of <NUM><NUM>/g.

According to an embodiment of the present invention, the purity of the alumina honeycomb ceramics is more than <NUM>%, so that the ceramic surface has a high compactness, which can effectively prevent adsorption of smoke and dust particles, thus to exert the effect of preventing odd smell. The high-purity alumina honeycomb ceramic has good thermal conductivity, with a thermal conductivity of 33W/mk; the wall thickness and pore diameter in the honeycomb ceramic structure are both very small, and the thermal conductivity is extremely excellent; the shape of the honeycomb porous can greatly increase the contact area with air, the alumina honeycomb ceramics has large specific area, and high heating efficiency, which is favorable for quickly heating the air. The honeycomb ceramic heating body of the present invention is arranged below a heat not burn product to be baked without contacting; when the user smokes the heat not burn, the air heated by the honeycomb ceramic heating body at the bottom gets into contact with the heat not burn and heat the heat not burn quickly and uniformly; due to the honeycomb porous structure, the air flow rate is restricted to some extent, and the contact time between the hot air and the heat not burn is prolonged, which slows the heat loss and saves energy. When there is no smoking action, the porous honeycomb ceramic can lock the hot air while reducing the outflow of hot air, which will further save energy.

To make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, in combination with the attached drawings given in the embodiments of the present invention, the technical scheme described in embodiments of the present invention are described explicitly and completely below. Apparently, the embodiments described only represent a part but not all of the embodiments of the present invention.

In the description of the present invention, it should be understood that the terms "above", "below", "inner", "outer", "front end", "rear end", "one end", "the other end", etc. refer to the direction or position based on the attached drawings. The terms are provided only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred therein must have a specific direction, must be constructed or operated in a specific direction, they can not be construed as a limitation on the present invention. The terms "first" and "second" are for illustrative purpose only, which may not to construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and defined, the terms "install", "arrange", "connect", etc. should be understood in a broad sense. For example, "connect" may be fixed connection or detachable connection or integral connection; it may be mechanical connection or electrical connection; it may be also direct connection or indirection connection through a medium, or it may be internal communication of two components. For those ordinary technicians skilled in the art, the specific meanings of the above terms quoted in the present invention can be understood according to specific situations.

With reference to the attached drawings, a ceramic heating element, an air-heating type heat not burn heating device with the ceramic heating element, and a preparation method of the ceramic heating element proposed by the embodiments of the present invention are illustrated in detailed below.

As shown in <FIG>, a ceramic heating element proposed in an embodiment of the present invention comprises a honeycomb ceramic body <NUM> and a heating printed circuit <NUM>. Wherein, porous channels <NUM> are arranged in the honeycomb ceramic body, and porous channels <NUM> are circular or polygonal holes; the heating printed circuit <NUM> is arranged around the outer surface of the honeycomb ceramic body <NUM> to heat the air passing through the porous channels <NUM>.

Optionally, as one embodiment, the alumina ceramic tube body is an alumina honeycomb ceramic body, and the alumina honeycomb ceramic body has a density being not less than <NUM>/cm<NUM>.

Optionally, as one embodiment, the porous channels are uniformly distributed in the honeycomb ceramic body.

Optionally, as one embodiment, the porous channels are arranged in the centre of the honeycomb ceramic body.

Optionally, as one embodiment, the honeycomb ceramic body is a cylinder with a circular or polygonal cross section.

With reference to the attached drawings, detailed description of embodiments of the present invention is described in details.

As shown in <FIG>, an alumina honeycomb ceramic heating element disclosed by the present invention, comprises an alumina honeycomb ceramic body <NUM>, a heating printed circuit <NUM>, and a wire <NUM>; porous channels <NUM> are arranged in the centre of the alumina honeycomb ceramic body <NUM>; and the porous channels <NUM> are evenly arranged square holes; the heating printed circuit <NUM> is arranged around the outer surface of the alumina honeycomb ceramic body <NUM>; and a wire <NUM> is arranged at a first end of the heating printed circuit <NUM>.

Further, the density of the alumina honeycomb ceramic body <NUM> is <NUM>/cm<NUM>.

Further, the resistance of the alumina honeycomb ceramic body <NUM> is <NUM>.

Further, the alumina honeycomb ceramic body <NUM> is a cylinder with a circular cross section.

Further, the square hole diameter of the porous channels <NUM> is <NUM>, that is, the side length of the square hole is <NUM>; the wall thickness of the porous channels <NUM> is <NUM>; as shown in <FIG>, distance between the corresponding sides of two adjacent square holes is the wall thickness of the porous channels <NUM>.

Further, the heating printed circuit <NUM> is made of silver.

Further, the printing thickness of the heating printed circuit <NUM> is <NUM>.

Further, the wire <NUM> is a silver wire, with a diameter of <NUM>.

As shown in <FIG>, an alumina honeycomb ceramic heating element disclosed by the present invention, comprises an alumina honeycomb ceramic body <NUM>, a heating printed circuit <NUM>, and a wire <NUM>; porous channels <NUM> are arranged in the centre of the alumina honeycomb ceramic body <NUM>; and the porous channels <NUM> are evenly arranged circular holes; the heating printed circuit <NUM> is arranged around the outer surface of the alumina honeycomb ceramic body <NUM>; and a wire <NUM> is arranged at a first end of the heating printed circuit <NUM>.

Further, the resistance of the alumina honeycomb ceramic body <NUM> is <NUM>.

Further, the alumina honeycomb ceramic body <NUM> is a cylinder with a circular cross section, and the porous channels <NUM> in the centre thereof are square holes.

Further, the circular pore diameter of the porous channels <NUM> is <NUM>; the wall thickness of the porous channels <NUM> is <NUM>, and the minimum distance between two adjacent circular holes is the wall thickness of the porous channels <NUM>.

In this embodiment, the porous channels <NUM> are circular holes, in comparison with the embodiment <NUM>, the utilization rate of the centre of the alumina honeycomb ceramic body <NUM> is obviously lower than that of the embodiment <NUM>, and its specific surface area is smaller than that of the embodiment <NUM>, and the heating efficiency is lower than that of the embodiment <NUM>.

In the present invention, the purity of the alumina honeycomb ceramics is more than <NUM>%, so that the honeycomb ceramic surface has high compactness, which can effectively prevent adsorption of smoke and dust particles, thus to exert the effect of preventing odd smell. The high-purity alumina honeycomb ceramic has good thermal conductivity, with a thermal conductivity of 33W/mk; the wall thickness and pore diameter in the honeycomb ceramic structure are both very small, and the thermal conductivity is extremely excellent; the shape of the honeycomb porous can greatly increase the contact area with air, the alumina honeycomb ceramics has large specific area, and high heating efficiency, which is favorable for quickly heating the air.

The honeycomb ceramic heating body of the present invention is arranged below a heat not burn product to be baked without contacting; when the user smokes the heat not burn, air flows through the holes in the honeycomb of the heating element and is heated to a certain temperature, and then the hot air flows through the heat not burn to rapidly heat the heat not burn to <NUM>. This method can improve the heating area and heating efficiency of heat not burn product, achieve even heating, carbonize tobacco more completely, avoid wasting of tobacco, improve the smoking experience of users, and it is not limited by the type of cartridge. Due to the honeycomb porous structure, the air flow rate is restricted to some extent, and the contact time between the hot air and the heat not burn is prolonged, which slows the heat loss and saves energy. When there is no smoking action, the porous honeycomb ceramic can lock the hot air while reducing the outflow of hot air, which will further save energy.

The embodiment of the present invention further discloses an air-heating type heat not burn heating device, as shown in <FIG>, the air-heating type heat not burn heating device comprises the ceramic heating element described in the embodiment <NUM> and the preheating device <NUM>.

A ceramic heating element <NUM> is arranged below the preheating device <NUM>.

Optionally, as one embodiment, the preheating device comprises a preheating tube, a deflector is arranged between the preheating tube and the ceramic heating element, and a plurality of guide holes are arranged on the deflector.

According one embodiment of the present invention, the ceramic heating element and the preheating device are arranged in a sealing sleeve.

Optionally, as one embodiment, the preheating device comprises a thin-wall alumina ceramic tube for preheating, a cavity in the centre of the thin-wall alumina ceramic tube is used for placing a smoking product, and an opening at one end of the thin-wall alumina ceramic tube and a base plate forms a cup body, and a plurality of hot air flow holes are arranged on the base plate.

Wherein, the thin-wall alumina ceramic tube body has a density not less than <NUM>/cm<NUM>.

Optionally, as one embodiment, a plurality of hot air flow holes are uniformly arranged around a virtual circle in the centre of the base plate, and the hot air flow holes are circular holes with a diameter ranging from <NUM> to <NUM>.

The base plate is made of high-purity alumina ceramics.

Specifically, as one embodiment, as shown in <FIG>, the air-heating heat not burn heating device comprises a preheating tube <NUM> and a ceramic heating element <NUM>, and the ceramic heating element <NUM> is arranged under the preheating tube <NUM>; the ceramic heating element <NUM> comprises a honeycomb ceramic body <NUM> and a heating printed circuit <NUM> arranged on the honeycomb ceramic body <NUM>, a wire <NUM> is arranged at an end of the heating printed circuit <NUM>, and honeycomb porous channels <NUM> are arranged in the ceramic heating body <NUM>.

Further, a deflector <NUM> is arranged between the preheating tube <NUM> and the ceramic heating element <NUM>, and a plurality of guide holes <NUM> are arranged on the deflector <NUM>.

Further, the preheating tube <NUM> and the ceramic heating element <NUM> are arranged in a sealing sleeve <NUM>.

Further, the preheating tube <NUM>, ceramic heating element <NUM> and deflector <NUM> are all made of high-purity alumina ceramics.

Further, printing materials of the heating printed circuit <NUM> include but are not limited to silver, tungsten, and MoMn.

Further, the wire <NUM> material includes but is not limited to silver, copper, and nickel.

Further, the honeycomb porous channels <NUM> are uniformly arranged circular holes or polygonal holes, with a pore diameter ranging from <NUM> to <NUM>, and the minimum distance between two adjacent holes within <NUM> - <NUM>.

Optionally, as one embodiment, as shown in <FIG>, a ceramic heating element <NUM> is arranged under the preheating tube <NUM>, and a deflector <NUM> is arranged between the preheating tube <NUM> and the ceramic heating element <NUM>, the preheating tube <NUM> and the ceramic heating element <NUM> are arranged inside a sealing sleeve <NUM>; as shown in <FIG>, the ceramic heating element <NUM> comprises a honeycomb ceramic body <NUM>, and a heating printed circuit <NUM> arranged on the honeycomb ceramic body <NUM>, a wire <NUM> is arranged at an end of the heating printed circuit <NUM>. When a smoker desires to smoke, he/she may put a cartridge into the preheating tube <NUM> to prevent the cartridge from falling; after powering on, the heating printed circuit <NUM> starts to heat, because the effective ingredients such as nicotine can only be heated to generate the smoke to smoke only when the cartridge is baked at <NUM>-<NUM>, so it is necessary to preheat the device, and preheating is deemed as completed when the temperature of the preheating tube <NUM> and the deflector <NUM> reaches <NUM>, the preheating is completed. Since the preheating is completed, at the time of a first and second puffs during the first heating, the cartridge only needs to be heated from <NUM> to <NUM>, which is faster than rising from the room temperature, and can better guarantee the smoke volume produced by the first and second puffs. To speed up heating, a honeycomb porous channel <NUM> is arranged in the honeycomb ceramic body <NUM> and the porous channels are uniformly arranged square holes or other polygonal holes, with the pore diameter ranging from <NUM> to <NUM>, and the minimum distance between two adjacent holes within <NUM>-<NUM>, and the expanded area is large, the air-heating efficiency is very high, and the heated air flows from the centre of the honeycomb without contacting the heating printed circuit <NUM>, so it will not cause pollution. As the preheating tube <NUM>, the ceramic heating element <NUM> and the deflector <NUM> are all made of high-purity alumina ceramics featuring good electrical insulation, high strength, and good thermal conductivity, so the ceramic heating element <NUM> will not leak when being heated, and the preheating tube <NUM> and the deflector <NUM> will be heated up because of the good thermal conductivity of high-purity alumina ceramics, the user can smoke the cartridge soon; during smoking the airflow is heated to <NUM> by the ceramic heating element <NUM>, then further homogenized and diverted through the diversion holes <NUM> on the deflector <NUM> and finally flows into the cartridge more evenly to heat the tobacco, so as to increase the smoke volume, improve the smoking taste, and provide good user experience. During smoking, some fluid contaminants emitted from the cartridge may inevitably remain in the device. As the high-purity alumina ceramics feature high compactness and almost have no pores in microstructure, so penetration of contaminants in fluid is impossible, and no pollution and odd smell will be left on the surface; In the working process, the sealing sleeve <NUM> serves as a seal, which ensures that the heated air will not flow to other places.

Optionally, as another embodiment, as shown in <FIG>, a ceramic heating element <NUM> is arranged under the preheating tube <NUM>, and the preheating tube <NUM> and the ceramic heating element <NUM> are arranged inside a sealing sleeve <NUM>; as shown in <FIG>, the ceramic heating element <NUM> comprises a honeycomb ceramic body <NUM>, and a heating printed circuit <NUM> arranged on the honeycomb ceramic body <NUM>, a wire <NUM> is arranged at an end of the heating printed circuit <NUM>. When a smoker desires to smoke, he/she may put a cartridge into the preheating tube <NUM> to prevent the cartridge from falling; after powering on, the heating printed circuit <NUM> starts to heat, because the effective ingredients such as nicotine can only be heated to generate the smoke to smoke only when the cartridge is baked at <NUM>-<NUM>, so it is necessary to preheat the device, and preheating is deemed as completed when the temperature of the preheating tube <NUM> reaches <NUM>, the preheating is completed. Since the preheating is completed, at the time of a first and second puffs during the first heating, the cartridge only needs to be heated from <NUM> to <NUM>, which is faster than rising from the room temperature, and can better guarantee the smoke volume produced by the first and second puffs. To speed up heating, a honeycomb porous channel <NUM> is arranged in the honeycomb ceramic body <NUM> and the porous channels are uniformly arranged square holes or other polygonal holes, with the pore diameter ranging from <NUM> to <NUM>, and the minimum distance between two adjacent holes within <NUM>-<NUM>, and the expanded area is large, the air-heating efficiency is very high, and the heated air flows from the centre of the honeycomb without contacting the heating printed circuit <NUM>, so it will not cause pollution. As the preheating tube <NUM> and the ceramic heating element <NUM> are made of high-purity alumina ceramics featuring good electrical insulation, high strength, and good thermal conductivity, so the ceramic heating element <NUM> will not leak when being heated, and the preheating tube <NUM> will be heated up because of the good thermal conductivity of high-purity alumina ceramics, the user can smoke the cartridge soon; during smoking the airflow is heated to <NUM> by the ceramic heating element <NUM>, when the smoker starts to smoke, the heated air flows to the preheating tube <NUM> through the ceramic heating element <NUM>, and the heated air flows into the cartridge to evenly heat the tobacco then further homogenized and diverted through the diversion holes <NUM> on the deflector <NUM> and finally flows into the cartridge more evenly to heat the tobacco, so as to increase the smoke volume, improve the smoking taste, and provide good user experience. During smoking, some fluid contaminants emitted from the cartridge may inevitably remain in the device. As the high-purity alumina ceramics feature high compactness and almost have no pores in microstructure, so penetration of contaminants in fluid is impossible, and no pollution and odd smell will be left on the surface; In the working process, the sealing sleeve <NUM> serves as a seal, which ensures that the heated air will not flow to other places.

Optionally, as one embodiment, as shown in <FIG>, a ceramic heating element <NUM> is arranged under the preheating tube <NUM>, and a deflector <NUM> is arranged on the preheating tube <NUM> and the ceramic heating element <NUM>; as shown in <FIG>, the ceramic heating element <NUM> comprises a honeycomb ceramic body <NUM>, and a heating printed circuit <NUM> arranged on the honeycomb ceramic body <NUM>, a wire <NUM> is arranged at an end of the heating printed circuit <NUM>. When a smoker desires to smoke, he/she may put a cartridge into the preheating tube <NUM> to prevent the cartridge from falling; after powering on, the heating printed circuit <NUM> starts to heat, because the effective ingredients such as nicotine can only be heated to generate the smoke to smoke only when the cartridge is baked at <NUM>-<NUM>, so it is necessary to preheat the device, and preheating is deemed as completed when the temperature of the preheating tube <NUM> and the deflector <NUM> reaches <NUM>, the preheating is completed. Since the preheating is completed, at the time of a first and second puffs during the first heating, the cartridge only needs to be heated from <NUM> to <NUM>, which is faster than rising from the room temperature, and can better guarantee the smoke volume produced by the first and second puffs. To speed up heating, a honeycomb porous channel <NUM> is arranged in the honeycomb ceramic body <NUM> and the porous channels are uniformly arranged square holes or other polygonal holes, with the pore diameter ranging from <NUM> to <NUM>, and the minimum distance between two adjacent holes within <NUM>-<NUM>, and the expanded area is large, the air-heating efficiency is very high, and the heated air flows from the centre of the honeycomb without contacting the heating printed circuit <NUM>, so it will not cause pollution. As the preheating tube <NUM>, the ceramic heating element <NUM> and the deflector <NUM> are all made of high-purity alumina ceramics featuring good electrical insulation, high strength, and good thermal conductivity, so the ceramic heating element <NUM> will not leak when being heated, and the preheating tube <NUM> and the deflector <NUM> will be heated up because of the good thermal conductivity of high-purity alumina ceramics, the user can smoke the cartridge soon; during smoking the airflow is heated to <NUM> by the ceramic heating element <NUM>, then further homogenized and diverted through the diversion holes <NUM> on the deflector <NUM> and finally flows into the cartridge more evenly to heat the tobacco, so as to increase the smoke volume, improve the smoking taste, and provide good user experience. During smoking, some fluid contaminants emitted from the cartridge may inevitably remain in the device. As the high-purity alumina ceramics feature high compactness and almost have no pores in microstructure, so penetration of contaminants in fluid is impossible, and no pollution and odd smell will be left on the surface.

As one embodiment, as shown in <FIG>, the preheating device comprises a thin-wall alumina ceramic tube for preheating, a cavity <NUM> in the centre of the thin-wall alumina ceramic tube <NUM> is used for placing a tobacco product such as cartridge, and an opening at one end of the thin-wall alumina ceramic tube <NUM> and a base plate <NUM> forms a cup body, and a plurality of hot air flow holes <NUM> are arranged on the base plate <NUM>; the thin-wall alumina ceramic tube body <NUM> has a density that is not less than <NUM>/cm<NUM>; the thin-wall alumina ceramic tube <NUM> is a thin-wall alumina ceramic hollow circular tube, with the wall thickness of <NUM>; the shape of the base plate <NUM> matches with that of an opening section of the thin-wall alumina ceramic tube <NUM>; <NUM> hot air flow holes <NUM> are uniformly arranged around a virtual circle in the centre of the base plate <NUM>, and the hot air flow holes <NUM> are circular holes with a diameter of <NUM>; and the base plate <NUM> has a thickness of <NUM>; and the base plate <NUM> is made of high-purity alumina ceramics.

Wherein, the purity of the ultra-thin high-purity alumina ceramics is more than <NUM>%, so that the ceramic surface has high compactness, which can effectively prevent adsorption of smoke and dust particles, thus to exert the effect of preventing odd smell. Ultra-thin high-purity alumina ceramics have good thermal conductivity (thermal conductivity up to 33W/m. k), and high heating efficiency, so it can quickly achieve the purpose of preheating the air in cavity <NUM>.

The preheating device is installed above the air heating element such as a ceramic heating element <NUM>, when the heating element is heated, it can be quickly heated up to preheat the cavity <NUM> as the base plate <NUM> and the thin-wall alumina ceramic tube <NUM> are both made of ultra-thin high-purity alumina ceramics. The thin-wall alumina ceramic tube <NUM> is not used as a traditional heating component, which can reduce heat loss. In a heating scheme in a related art, a ceramic heating tube is used to bake a a smoking product directly, a heating circuit is printed on the outer surface of the ceramic heating tube, when the power is on, the high temperature of the ceramic heating tube itself will bake the smoking product, in this way, the heat utilization rate is low, and a lot of heat is released while baking the tobacco, which does not economic and environmental friendly. In the embodiments of the present invention, heating the smoking product is achieved by the user's smoking action, and hot air is extracted from the heating component under the hot air flow hole <NUM> to bake the smoking product, the baking effect is good and the baking is uniform. On one hand, the hot air flow hole can facilitate the circulation of hot air; on the other hand, direct diffusion of hot air is prevented when no one smokes, thus to achieve heat preservation. The high-purity alumina ceramic material has good compactness, which will reduce the absorption of smoke dust particles, generate no odd smell, it is therefore safer to use.

Besides, an embodiment of the present invention further discloses a preparation method of the ceramic heating element, which comprises the following steps:.

According to one embodiment of the present invention, the preparation method of the said alumina honeycomb ceramic heating element comprises the following steps:.

Further, the nano alumina powder used in step <NUM> has a purity of <NUM>% or above, a particle size of <NUM>, and a specific surface area of <NUM><NUM>/g.

Further, the density of the alumina honeycomb ceramic body is <NUM>/cm<NUM>.

Further, the resistance of the alumina honeycomb ceramic body is <NUM>.

Further, the alumina honeycomb ceramic body is a cylinder with a circular cross section, and the porous channels in the centre thereof are evenly distributed square holes.

Further, the square hole diameter of the porous channels is <NUM>, that is, the side length of the square hole is <NUM>; the wall thickness of the porous channels is <NUM>; as shown in <FIG>, distance between the corresponding sides of two adjacent square holes is the wall thickness of the porous channels.

Further, the heating printed circuit is made of silver.

Further, the printing thickness of the heating printed circuit is <NUM>.

Further, the wire is a silver wire, with a diameter of <NUM>.

According to another embodiment of the present invention, the preparation method of the said alumina honeycomb ceramic heating element comprises the following steps:.

Further, the resistance of the alumina honeycomb ceramic body is <NUM>.

The purity of the alumina honeycomb ceramics prepared by the preparation method of the present invention is more than <NUM>%, so that the honeycomb ceramic surface has high compactness, which can effectively prevent adsorption of smoke and dust particles, thus to exert the effect of preventing odd smell. The high-purity alumina honeycomb ceramic has good thermal conductivity, with a thermal conductivity of 33W/mk; the wall thickness and pore diameter in the honeycomb ceramic structure are both very small, and the thermal conductivity is extremely excellent; the shape of the honeycomb porous can greatly increase the contact area with air, the alumina honeycomb ceramics has large specific area, and high heating efficiency, which is favorable for quickly heating the air.

The honeycomb ceramic heating element of the present invention is arranged below a heat not burn product to be baked without contacting; when the user smokes the heat not burn, air flows through the holes in the honeycomb of the heating element and is heated to a certain temperature, and then the hot air flows through the heat not burn to rapidly heat the heat not burn to <NUM>. This method can improve the heating area and heating efficiency of heat not burn product, achieve even heating, carbonize tobacco more completely, avoid wasting of tobacco, improve the smoking experience of users, and it is not limited by the type of cartridge. Due to the honeycomb porous structure, the air flow rate is restricted to some extent, and the contact time between the hot air and the heat not burn is prolonged, which slows the heat loss and saves energy. When there is no smoking action, the porous honeycomb ceramic can lock the hot air while reducing the outflow of hot air, which will further save energy.

Claim 1:
A ceramic heating element, comprising:
a honeycomb ceramic body (<NUM>), wherein porous channels (<NUM>) are arranged in the honeycomb ceramic body (<NUM>), and the porous channels (<NUM>) are circular holes or polygonal holes; and
a heating printed circuit (<NUM>), wherein the heating printed circuit (<NUM>) is arranged around the outer surface of the honeycomb ceramic body (<NUM>) to heat the air passing through the porous channels (<NUM>), characterised in that the honeycomb ceramic body (<NUM>) is an alumina honeycomb ceramic body (<NUM>), the alumina honeycomb ceramic body (<NUM>) has a density being not less than <NUM>/cm<NUM>, and the porous channels (<NUM>) are uniformly distributed in the honeycomb ceramic body (<NUM>).