CN109349681A - Porous heating body, atomizer including porous heating body, and preparation method of porous body - Google Patents
Porous heating body, atomizer including porous heating body, and preparation method of porous body Download PDFInfo
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- CN109349681A CN109349681A CN201811357202.6A CN201811357202A CN109349681A CN 109349681 A CN109349681 A CN 109349681A CN 201811357202 A CN201811357202 A CN 201811357202A CN 109349681 A CN109349681 A CN 109349681A
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Abstract
本发明提出一种多孔体制备方法，方法包括按照各质量百分数的如下成分获取原料：硅藻土50％～75％、氧化铝0％～10％、造孔剂15％～35％、粘土5％～10％、玻璃粉5％～15％；将原料与石蜡均匀混合后制成原料蜡块；将原料蜡块按照所需形状压制成型，获得生胚；将生胚先于200～500℃下保温4～10h、再于700～1200℃下烧结2～4h，得到多孔体。本发明制备的多孔体，相比通常的普通陶瓷棒，体现在电子烟上出烟容易快，烟雾量相对大。
The invention provides a method for preparing a porous body. The method includes obtaining raw materials according to the following components in various mass percentages: diatomite 50%-75%, alumina 0%-10%, pore-forming agent 15%-35%, clay 5% %～10%, glass powder 5%～15%; mix the raw material and paraffin uniformly to make raw material wax block; press and shape the raw material wax block according to the desired shape to obtain the raw embryo; The temperature is kept for 4-10 hours, and then sintered at 700-1200 DEG C for 2-4 hours to obtain a porous body. Compared with ordinary ceramic rods, the porous body prepared by the present invention is reflected in that the electronic cigarette is easy and fast to emit smoke, and the amount of smoke is relatively large.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronic cigarettes, in particular to a porous heating element, an atomizer comprising the porous heating element and a porous body preparation method.
Background
The core component of the electronic cigarette product is an atomizer for evaporating the electronic cigarette oil, and the function of the atomizer is mainly realized based on a porous body and a heating element. Wherein, the porous body is a part with capillary micropores inside, and can perform tobacco tar infiltration absorption and conduction through the micropores inside; the heating element is provided with a heating part for heating and a conductive pin part, and the heating part is used for heating and evaporating the tobacco tar conducted by the porous body to form tobacco tar aerosol for smoking.
At present, porous bodies are generally made of porous fibers, porous ceramics, foamed metals, and the like; these rigid porous bodies are typically hollow cylindrical and/or block-shaped in use, and the heat generating element is embedded within the ceramic body and then integrally mounted within a fixed size atomizer housing.
On the one hand, on the premise that the inner diameter and the outer diameter of the porous body are constant, the hollow columnar structure is relatively slow in oil infiltration and oil conduction speed, so that insufficient oil conduction is easy to cause the decomposition of essence and flavor, and the reduction degree in taste experience is insufficient or a heating wire is burnt to generate burnt flavor; and the constant cylindricality of external diameter is not convenient for set up the structural component who fixes and is connected with atomizer shell cover, is not convenient for realize stable assembly and sealed.
Disclosure of Invention
In order to solve the problems of oil guiding and assembly of a porous oil guiding body in the prior art, the embodiment of the invention provides a porous heating body which is better in oil guiding performance and convenient to assemble and seal.
The porous heating body comprises a porous body for conducting liquid, wherein the porous body comprises a first porous part, a second porous part and a third porous part which are sequentially arranged along the length direction of the porous body; and the first porous portion and the third porous portion each have a larger cross-sectional area than the second porous portion in the width direction of the porous body;
the porous body is provided with a heating element extending along the length direction of the porous body, and the heating element is provided with a heating part for atomizing liquid to generate aerosol; at least a part of the extension length of the heat generating portion in the longitudinal direction of the porous body overlaps with the extension length of the second porous portion.
Preferably, the first porous portion has a constant cross-sectional area in the width direction of the porous body;
and/or the presence of a gas in the gas,
the second porous portion has a constant cross-sectional area in the width direction of the porous body;
and/or the presence of a gas in the gas,
the third porous portion has a constant cross-sectional area in the width direction of the porous body.
Preferably, the first porous portion has a cross-sectional area in the width direction of the porous body that gradually decreases in the length direction of the porous body and in the direction toward the second porous portion.
Preferably, the first porous part comprises a first oil guide section and a second oil guide section which are arranged in sequence along the length direction of the porous body and towards the direction of the second porous part; wherein,
the cross section area of the first oil guide section in the width direction is constant;
the cross-sectional area of the second oil guiding section in the width direction gradually decreases along the length direction of the porous body and in the direction of the second porous part.
Preferably, the cross-sectional area of the third porous portion in the width direction of the porous body gradually decreases in the length direction of the porous body and in the direction toward the second porous portion.
Preferably, the third porous part comprises a third oil guiding section and a fourth oil guiding section which are arranged in sequence along the length direction of the porous body and in the direction of the second porous part; wherein,
the cross section area of the third oil guide section in the width direction is constant;
the cross-sectional area of the fourth oil guiding section in the width direction gradually decreases along the length direction of the porous body and in the direction of the second porous part.
On the basis of the porous heating body, the invention further provides an atomizer product containing the porous heating body; the atomizer comprises a hollow outer shell, wherein an oil storage cavity for storing tobacco tar is arranged in the outer shell; a porous heating body for absorbing the tobacco tar from the oil storage cavity and atomizing the tobacco tar is also arranged in the outer shell; the porous heating body is the porous heating body.
Preferably, the porous body is further provided with at least one through hole which penetrates the first porous portion, the second porous portion and the third porous portion in sequence along the length direction of the porous body.
Preferably, the porous body is further provided with at least one through hole which penetrates the first porous portion, the second porous portion and the third porous portion in sequence along the length direction of the porous body.
Preferably, the inner wall of the through hole comprises a first tobacco tar working surface; and along the radial direction of the through hole, the second porous part is provided with a second tobacco tar working surface corresponding to the first tobacco tar working surface;
and when the quantity of through-hole is more than two, follow the radial direction of through-hole, the interval of first tobacco tar working face is the same with second tobacco tar working face.
Preferably, the through hole is used for guiding out aerosol; the first tobacco tar working surface is configured as an atomization surface for atomizing tobacco tar, and a heating part of the heating element is arranged on the atomization surface; the second tobacco tar working surface is configured as a liquid contacting surface for contacting tobacco tar.
Preferably, the inner wall of the through hole is provided with two opposite atomizing surfaces, a first heat generating part and a second heat generating part are correspondingly arranged on the two atomizing surfaces, and the first heat generating part and the second heat generating part are connected in parallel or in series.
Preferably, the through hole is communicated with the oil storage cavity, the first tobacco tar working surface is configured as a liquid contact surface contacting with tobacco tar, the second tobacco tar working surface is configured as an atomization surface atomizing the tobacco tar, and the heating part is arranged on the atomization surface.
Preferably, the shortest conduction distance of the tobacco tar to the corresponding atomization surface through the liquid contact surface is less than the distance between the inner wall of the through hole and the outer surface of the first porous part or the third porous part along the radial direction of the through hole.
Preferably, the through-holes include a first through-hole and a second through-hole that sequentially penetrate the first porous portion, the second porous portion, and the third porous portion in a length direction of the porous body;
the heating element comprises a first heating part arranged on the atomization surface of the first through hole and a second heating part arranged on the atomization surface of the second through hole; and the first and second heat generating portions are configured to have different heat generating temperatures.
Preferably, a smoke transmission pipe for outputting smoke oil aerosol generated by atomizing the porous heating element to the outside of the atomizer, a fixing seat for fixing the porous heating element and a connecting piece for connecting the porous heating element and the smoke transmission pipe are arranged in the outer shell; wherein,
the fixed seat is provided with a first accommodating part matched with the first porous part;
the connecting piece is provided with a second accommodating part matched with the third porous part and a connecting part connected with the smoke conveying pipe;
the porous heating body is connected with the fixed seat through the matching of the first porous part and the first accommodating part and is connected with the connecting piece through the matching of the third porous part and the second accommodating part.
By adopting the porous heating body, the porous body is in the dumbbell shape with the fine middle part and the thick two ends, the middle part has shorter tobacco tar conduction distance, the tobacco tar conduction is faster, and the oil conduction during the atomization of the tobacco tar is favorably improved. The protruding parts at the two ends can play an oil storage effect to supplement the tobacco tar consumption of the middle part, thereby improving the tobacco tar supplement efficiency during atomization; on the other hand, the fixing and sealing connection with other parts is convenient; meanwhile, the heat conduction to the parts connected with the porous heating body at the two ends can be reduced.
Based on the idea of higher oil-guiding efficiency of the porous body, the invention also provides a preparation method of the porous body with high smoke output and smoke output efficiency and a porous body product prepared by the method, wherein the method comprises the following steps:
the raw materials are obtained according to the following components in percentage by mass: 50-75% of diatomite, 0-10% of alumina, 15-35% of pore-forming agent, 5-10% of clay and 5-15% of glass powder;
uniformly mixing the raw materials with paraffin to prepare raw material wax blocks;
pressing and forming the raw material wax block according to a required shape to obtain a green body;
and (3) preserving the heat of the green body for 4-10 hours at 200-500 ℃, and sintering for 2-4 hours at 700-1200 ℃ to obtain the porous body.
Preferably, the pore-forming agent is selected from at least one of sucrose, starch, wood fiber and short carbon fiber.
Preferably, before the step of uniformly mixing the raw materials with paraffin to prepare the raw material wax block, the method further comprises the following steps:
and carrying out wet ball milling treatment on the raw materials in a deionized water or absolute ethyl alcohol medium.
Preferably, in the step of press-forming the raw wax block into a desired shape,
the compression molding is carried out at the temperature of 70-85 ℃ and under the pressure of 0.4-1 MPa.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic perspective view of a porous heating element according to a preferred embodiment of the present invention;
FIG. 2 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in another embodiment;
FIG. 3 is a schematic perspective view of a porous heat-generating body provided in still another embodiment;
FIG. 4 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 5 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 6 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 7 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 8 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 9 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 10 is a schematic sectional view of the porous heat-generating body of the embodiment of FIG. 1 in the longitudinal direction;
FIG. 11 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 12 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 13 is a schematic sectional view in the longitudinal direction of a porous heat-generating body provided in still another embodiment;
FIG. 14 is a schematic view showing an installation of the porous heat-generating body shown in FIG. 12 in an oil storage chamber of an atomizer;
FIG. 15 is a schematic perspective view of a porous heat-generating body provided in another preferred embodiment;
FIG. 16 is a schematic sectional view of the porous heat-generating body of the embodiment of FIG. 15 in the longitudinal direction;
FIG. 17 is a schematic view of a structure of a porous heat-generating body provided in still another embodiment;
FIG. 18 is a schematic view of the second porous portion of the embodiment of FIG. 17 with a heat generating portion mounted thereon;
FIG. 19 is a schematic axial cross-sectional view of an atomizer according to an embodiment of the present invention;
FIG. 20 is an exploded schematic view of respective parts of a porous heat-generating body assembling structure in the atomizer of FIG. 19;
FIG. 21 is a schematic view of the silicone connector of FIG. 20 from another perspective;
FIG. 22 is a sectional scanning electron microscope analysis of a porous body prepared according to an example and a conventional ceramic rod.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and detailed description.
The porous heating element of the embodiment of the invention is mainly applicable to the atomizer of the electronic cigarette product, and can be extended to be used in a liquid medicine component volatilization device or other aromatic component release devices based on the same oil guiding and atomizing function.
The outline perspective view structure of one embodiment of the porous heat-generating body of the present invention can be seen from FIG. 1, and the overall shape is substantially dumbbell-shaped. In the implementation, various similar changes can be made on the basis of the shape of fig. 1, and the overall shape design and structure principle can be explained by referring to fig. 2. The porous heating body comprises a cylindrical porous body which extends longitudinally and a heating element which is contacted with the porous body, wherein the porous body internally has a micropore structure and is used for permeating and conducting tobacco tar to supply the tobacco tar to the heating element, and the heating element is used for heating the tobacco tar to generate aerosol; wherein the porous body comprises a first porous part 10, a second porous part 20 and a third porous part 30 which are coaxially arranged in sequence along the length direction; and,
the outer diameters of the first porous portion 10 and the third porous portion 30 are each larger than the second porous portion 20 in the width direction.
The porous body of the above structure is divided into three parts in the longitudinal direction, the first porous portion 10, the second porous portion 20, and the third porous portion 30 described above in this order, and the outer diameter of the second porous portion 20 is made smaller than the first porous portion 10 and the third porous portion 30 in the width direction, so that a cavity 21 is formed on the surface of the porous body opposite to the second porous portion 20, resulting in a generally dumbbell-shaped shape as a whole. The heating element may be formed on the porous body by sintering, printing, coating, etching, or the like, or may be mounted on the porous body as a separate component. The structure of the heat generating element includes two parts, respectively, a heat generating part 50 for generating heat, and an electrode pin (or a conductive connection part, the electrode pin is not shown in the heat generating element of the embodiment of fig. 1 to 14, and is shown in fig. 15 and 16) for realizing conduction of the heat generating part by connecting the heat generating part 50 with a power supply electrode. The heat generating portion 50 extends in the longitudinal direction of the porous body, and the heat generating portion 50 is provided at a position corresponding to the second porous portion 20, that is, at least a part of the extension length of the heat generating portion 50 in the longitudinal direction of the porous body overlaps with the extension length of the second porous portion 20, thereby improving oil guiding efficiency and smoke output. A specific combination of the heat generating portion 50 and the porous body may be such that the heat generating portion 50 is wound around the outer surface of the second porous portion 20 as shown in the embodiment of fig. 7 and 8, or the heat generating portion 50 is attached to the inner surface of the second porous portion 20, like shown in fig. 2.
Referring to fig. 14, when the porous heat-generating body is installed in the oil storage chamber C of the atomizer, the above porous heat-generating body contributes to the improvement of the oil conductivity and the atomization efficiency in that the inner and outer surfaces in the width direction of the second porous portion 20 are defined as the oil absorption surface a and the atomization surface b, respectively, that is, the outer surface of the second porous portion 20 is defined as the oil absorption surface a contacting with the tobacco smoke, and the inner wall surface of the through hole is defined as the atomization surface b, and the heat-generating portion 50 is located on the atomization surface b, and the shortest transmission distance D of the tobacco smoke in the width direction between the oil absorption surface a and the atomization surface b is smaller than the transmission distance D between the outer surface of the first porous portion 10 or the third porous portion 30 and the inner wall surface of the through hole, so that the transmission efficiency of the tobacco smoke of the second porous portion 20 corresponding to the position of the heat-generating portion 50 is. The first porous part 10 and the third porous part 30 at two ends form a shape with two protruding ends, so that on one hand, the effect of storing oil can be achieved to supplement the consumption of the tobacco tar at the middle part, and the tobacco tar supplementing efficiency is improved during atomization; on the other hand, the two fixed connecting parts A and B shown in FIG. 14 can be used for connection, so that the fixed connection and the sealing connection can be conveniently carried out in the atomizer; meanwhile, the first porous portion 10 and the third porous portion 30 have a larger volume than the second porous portion 20, and the heat generated in the heat generating portion 50 can be absorbed by the first porous portion 10 and the third porous portion 30 themselves, thereby reducing the heat transfer from the second porous portion 20 to the fixed connection members a and B in the longitudinal direction.
Further, in the porous body shown in the figure, the heat generating portion 50 may be a heat generating coil, a sheet-shaped heat generating net, a cylindrical heat generating tube, or the like, and is mounted on the porous body so as to extend along the longitudinal direction of the porous body when mounted, and the heat generating portion 50 of the heat generating element is opposed to the second porous portion 20 in the width direction, that is, at least a part of the heat generating portion 50 and the second porous portion 20 in the longitudinal direction is overlapped with the extending length of the second porous portion 20, thereby having better smoke atomization efficiency.
Of course, the second porous portion 20 is of a cylindrical shape, preferably cylindrical/square cylindrical, etc., based on the product configuration and functional requirements of the usual form and specification; the first porous portion 10 and the third porous portion 30 may also be adjusted accordingly. Such as in the embodiment of fig. 3, the first porous portion 10 and the third porous portion 30 are designed in a square-cylindrical shape and the inner through holes 40 correspond. The inner wall of the through hole 40 has two opposite atomization surfaces, a first heat generation part 50a and a second heat generation part 50b are correspondingly arranged on the two atomization surfaces, and the first heat generation part 50a and the second heat generation part 50b are connected with power supply components in parallel or in series.
Further, since the porous heating element is required to be applicable to the requirement of internal atomization when used, in the embodiments other than fig. 7, the porous bodies each have the through-holes 40 that penetrate the first porous portion 10, the second porous portion 20, and the third porous portion 30 in this order in the longitudinal direction; the through hole 40 serves to provide a space for installing a heating part 50 such as a spiral heating coil, a cylindrical heating net, a heating wire, etc., and serves to transmit the smoke aerosol generated by internal atomization to the smoke channel of the atomizer, while the through hole 40 serves as a transmission channel of the smoke aerosol.
Further, in the porous bodies of the embodiments of fig. 4 to 6 of the present invention, the outer diameter of the first porous portion 10 in the width direction is gradually reduced in the length direction and in the direction toward the second porous portion 20, based on better use and assembly effects. By designing the first porous portion 10 to have a shape that gradually decreases in outer diameter and transitions toward the second porous portion 20, the transition shape is more favorable for the infiltration and conduction efficiency of the tobacco tar from the two ends to the middle, and is favorable for the improvement of the smoke output and the smoke output efficiency. In the above transition-type design of the first porous portion 10, the surface of the first porous portion 10 may be inclined toward the second porous portion 20, and may be generally performed in various manners, such as convex arc/concave arc/flat in fig. 4 to 6.
Meanwhile, in order to facilitate subsequent smooth tight assembly with a silicone seat and the like in the outer shell, further referring to fig. 6 to 13, the first porous portion 10 may be designed in a segmented manner, and the segmented design is shown in the figure and includes two parts, namely, a first oil guiding section 11 and a second oil guiding section 12, which are sequentially arranged along the length direction of the porous heating body and in the direction of the second porous portion 20; wherein,
the first oil guiding section 11 has a cylindrical shape with a constant outer diameter, and the second oil guiding section 12 has a gradually decreasing outer diameter along the length direction and in the direction of the second porous portion 20. The shape of the final segment is designed to facilitate assembly with other components by using the first oil guiding segment 11 as a part protruding from both ends, and the second oil guiding segment 12 as a transitional shape to promote the infiltration and conduction of the smoke.
Of course, in the above transitional design, the surface of the second oil guiding section 12 is inclined toward the second porous portion 20, and may be performed in various manners, such as convex arc/concave arc/flat, or combinations thereof in fig. 6 to 13.
Further, the porous body of the present invention may be made of a porous material such as porous ceramic, porous glass, or foamed metal, and may be made of a hard capillary structure such as honeycomb ceramic made of a material such as alumina, silicon carbide, or diatomaceous earth.
From the above structure, it can be seen that the third porous portion 30 is present in correspondence with the first porous portion 10, and therefore, the above transitional slope/segmentation and the like of the third porous portion 30 is designed in correspondence with the first porous portion 10, and the third porous portion 30 can also be similarly implemented as the first porous portion 10 described above; and will not be repeated herein.
Meanwhile, the porous body and the heating element can be assembled and combined to form a complete porous heating body after being respectively obtained; in more implementation scenarios and applications, the raw material of the heating element may be directly sintered and molded on the surface of the porous body. The sintering and forming method specifically comprises the following steps: mixing raw materials (such as nickel metal powder) of the heating element with a certain amount of sintering aids to prepare mixed slurry; and then coating the mixed slurry on the inner/outer surfaces of the porous body to form a printing layer by adopting a coating mode according to a required shape, and then sintering to form the heating element on the porous body. Alternatively, the heat generating element is a heat generating circuit provided on the surface of the porous body, and the heat generating circuit includes, but is not limited to, a heat generating material coating layer, a resistance paste printed circuit, and the like. The porous body and the heating element are manufactured into an integral structure, so that the heating element can be prevented from being deformed or broken to influence the heating performance.
In addition to the above surface mounting, the heat generating element 50 may be mounted by an internal embedding method as shown in fig. 13; by embedding the heating part 50 in the porous body, the atomization of the tobacco tar is not conducted to the surface of the heating part 50 to contact with the surface, but the tobacco tar is heated and atomized at the position close to the heating part 50 in the porous body; on one hand, the heat conducting contact between the heating part 50 and the porous body does not generate dry burning, and on the other hand, most of the tobacco tar is not directly contacted with the heating part 50 during atomization, so that the metal pollution generated by the heating element contained in the aerosol can be avoided.
On the basis of the same idea as above, the present invention also proposes a porous heat-generating body of still another preferred embodiment, the structure of which is shown in FIGS. 15 to 17; compared with the structure of the embodiment, the number of the through holes in the porous heating body is correspondingly increased, and the structure is correspondingly changed and designed by combining the atomization efficiency; the porous body structure includes two through holes, a first through hole 40a and a second through hole 40b, which sequentially penetrate the first porous portion 10, the second porous portion 20 and the third porous portion 30 in the longitudinal direction.
Referring to fig. 15, due to the structural arrangement of the first through-holes 40a, and the second through-holes 40b, the surface of the monolithic porous body is divided into four parts, a first inner surface n of the first through-holes 40a, a first outer surface m corresponding to the first through-holes 40a, and a second inner surface k of the second through-holes 40b, a second outer surface j corresponding to the second through-holes 40 b.
For the two corresponding surfaces m and n of the first through hole 40a, the first inner surface n can be configured as an atomizing surface/oil suction surface, and the first outer surface m can be configured as an oil suction surface/atomizing surface correspondingly, so that one is used for sucking oil and the other is used for atomizing; meanwhile, the heat generating portion 50 (which may be embedded in the surface or attached to the surface) is provided on a surface configured as an atomizing surface, such as the first heat generating portion 50a provided on the first inner surface n when the first inner surface n is an atomizing surface as shown in fig. 16. In addition, the two corresponding surfaces k and j of the second through hole 40b may be respectively made one for absorbing oil and the other for atomizing, and the second heat generating portion 50b corresponding to the atomizing surface may be installed.
Of course, it should be noted that the embodiment in fig. 15 and 16 is a preferred design when the number of through holes is two; in other modified embodiments, the number of the through holes can be increased to 3/4 or more correspondingly under the condition that the volume of the porous body is enough, and the heating part is correspondingly arranged, so that the porous heating body has faster oil guiding and atomizing efficiency. Meanwhile, the atomization surface/heating surface in fig. 16 may be configured in an opposite manner, so that the first outer surface m and the second outer surface j are atomization surfaces, and the first inner surface n and the second inner surface k are oil absorption surfaces; the first and second heat generating portions 50a and 50b may be adjusted to be disposed at positions close to the first and second outer surfaces m and j, respectively. The heating portion 50 may be attached to the outer surface in a surface-attached manner similar to that shown in fig. 7 and 8, or embedded in the outer surface (as will be easily understood and implemented by the skilled person, the detailed description thereof will be omitted).
In the embodiment, the first and second heat generating portions 50a and 50b and the porous body may be formed on the porous body by sintering, printing, coating, etching, or the like as described above.
Meanwhile, a smoke mixing chamber 41 which is simultaneously communicated with the first through hole 40a and the second through hole 40b is further arranged on the porous body, smoke oil aerosol generated in the first through hole 40a and smoke oil aerosol generated in the second through hole 40b are collected and mixed in the smoke mixing chamber 41 along the transmission direction, and then the smoke oil aerosol is output to a smoke pipeline of the atomizer through the smoke mixing chamber 41. Two or more expansion functions can be realized through the smoke mixing chamber 41, on one hand, the smoke mixing chamber can be used as a mixing space of smoke oil aerosol, and has the functions of guiding flow and outputting smoke dispersed in each through hole in a centralized manner; on the other hand, the smoke mixing function of the smoke mixing chamber 41 can be further used for adjusting the taste of the smoke. Specifically, the heat generation temperature may be set to be different between the first heat generating portion 50a and the second heat generating portion 50b, for example, the heat generation temperature of the first heat generating portion 50a may be set to be lower than that of the second heat generating portion 50 b. Because the flavor components in the tobacco tar (the components of the tobacco tar are mainly vegetable glycerin, propylene glycol and flavor besides nicotine) are low in boiling point, high in boiling point of the vegetable glycerin and medium in the propylene glycol; when the heating temperature of the first heating part 50a is set lower than that of the second heating part 50b, the flavor of the smoke components generated in the first through hole 40a is heavier than that of the smoke generated in the second through hole 40b, and the plant glycerin components are less than that of the second through hole 40 b; the mixed aerosol can have different tastes through different heating powers, and the taste is different from the taste of the smoke generated in the through holes. Further, by controlling the first and second heat generating parts 50a and 50b according to more variations of different power output powers, it is possible to enable an end user to absorb more smoke with different tastes.
Further corresponding to the structure of the plurality of through-holes, the shape design of the outer surface of the porous body is explained by taking the first through-holes 40 a/second through-holes 40b in fig. 15 as an example in a circular hole manner; the first outer surface m corresponding to the first through hole 40a and the second outer surface j corresponding to the second through hole 40b are formed in the shape of a longitudinal arc surface coaxially disposed with the through holes. The object is to make the distances from the first inner surface n equal everywhere on the first outer surface m in the radial direction of the first through hole 40 a; and the distance from the second inner surface k is equal everywhere on the second outer surface j along the radial direction of the second through hole 40 b; by adopting the shape design of the outer surface of the porous body, the oil guiding speed in each through hole is uniform and stable.
When the outer surface design with the above shape is adopted, a groove 22 is formed at the joint of the first outer surface m and the second outer surface j, and the groove 22 is beneficial to guiding oil to the part f between the first through hole 40a and the second through hole 40b so as to make up for the defect that the oil guiding speed is slow when the thickness of the part f between the first through hole 40a and the second through hole 40b is larger than that of the two side parts e.
Meanwhile, when the above first through-holes 40 a/second through-holes 40b are circular holes, the first through-holes 40 a/second through-holes 40b may be square holes in the embodiment of fig. 3, and the structure of the porous body when designed by the shape of the square holes is shown in fig. 17 and 18; in this case, when the inner wall of the through hole is configured as the atomizing surface to mount the heat generating portion, in order to ensure the conduction of the soot on each atomizing surface, the description will be made in correspondence with two ways in fig. 17 and 18. In particular, the method comprises the steps of,
the first through hole 40a of the porous body having a square shape may form four inner wall surfaces, and a first heat generating portion 50a and a second heat generating portion 50b extending in the axial direction of the first through hole 40a are provided oppositely on two side walls thereof in fig. 18; a pair of inner wall surfaces L1 and L2 on which the first heat generating portion 50a and the second heat generating portion 50b are located are parallel and opposed to an outer surface L3 and an outer surface L4 opposed to each other on the outer surface of the second porous portion 20, respectively; the inner wall surface L1 and the outer surface L3, and the inner wall surface L2 and the outer surface L4 are respectively configured as an atomizing surface/an oil suction surface, so that the distances of smoke oil conduction are uniform and the same, and the uniform and stable oil guiding speed is ensured.
In fig. 18, the third heat generating portion 50c and the fourth heat generating portion 50d of the second through hole 40b are respectively located on the pair of inner wall surfaces L5 and L6, and the inner wall surface L6 can be parallel to and opposed to the outer surface L8 of the porous body, so that when the inner wall surface L6 is arranged as an atomizing surface, the outer surface L8 is an oil absorption surface, and good smoke oil conduction is performed; the inner wall surface L5 does not have a porous body outer surface that can conduct oil relatively well; a third through hole 40c may be further provided on the porous body, the third through hole 40c existing only for oil absorption, so that the inner wall surface L5 of the second through hole 40b has an opposing inner wall L7 located at the third through hole 40c for corresponding oil absorption surface when the inner wall surface L5 is arranged as the atomizing surface. Under various conditions, the conduction distance from the oil absorption surface to the atomization surface of the tobacco oil is uniform and the same, so that the uniform and stable oil guiding speed is ensured, and the porous heating body can well discharge the tobacco.
In addition, the heat generating parts (such as the first heat generating part 50a, the second heat generating part 50b, the third heat generating part 50c and the fourth heat generating part 50d) in the above embodiments may be respectively provided with electrode pins to form independent heat generating elements; the heating parts can also belong to one heating element, and the heating parts can finally share one group of pins for power supply in a parallel/serial mode during installation.
The above structural design provides the second porous portion 20 with the tobacco working surface corresponding to the inner side wall of the first through hole 40 a/the second through hole 40b (i.e., one of the above for tobacco atomization or tobacco contact; the tobacco working surface is not necessarily limited to being formed by the surface of the second porous portion 20 by the above description of the third through hole 40 c), and the inner side wall of the first through hole 40 a/the second through hole 40b and the corresponding tobacco working surface are at the same distance in the respective radial directions, so that the efficiency of uniformly and well tobacco conduction and stable smoke generation can be achieved when respectively configured as one of the atomization surface/the tobacco working surface.
Of course, the second porous portion 20 may not have the above-described third through hole 40c, and the heat generating portion may be provided on the inner wall surface other than the inner wall surface L5 in accordance with the usage requirement of high oil extraction efficiency; alternatively, when the second porous portion 20 does not have the above-described third through hole 40c without requiring a high oil extraction efficiency, the oil atomized on the inner wall surface L5 is conducted to another position relatively distant from the second porous portion 20, and the oil extraction efficiency is slightly lower than the oil extraction efficiency.
On the basis, when the shape of the through hole is deformed into other polygonal shapes and the like or/or the number of the through holes is increased to 3/4 or more, the second porous part 20 still forms a tobacco tar working surface with the same corresponding distance with the inner wall of the through hole by utilizing the surface or an adding structure, and then one of the tobacco tar working surfaces is configured into an atomizing surface/an oil absorption surface for use, so that the uniform and stable oil guiding rate is ensured, and the porous heating body can well discharge smoke.
By adopting the porous heating body, the porous body is changed into the dumbbell shape, the middle part has a shorter tobacco tar conduction distance, and the oil conduction property during tobacco tar atomization is favorably improved. The protruding parts at the two ends can play an oil storage effect to supplement the tobacco tar consumption of the middle part, thereby improving the tobacco tar supplement efficiency during atomization; on the other hand, the fixing and sealing connection with other parts is convenient; meanwhile, the heat dissipation outwards can be reduced.
On the basis of the contents of the porous heating body, the invention further provides an atomizer product containing the porous heating body. The structure of the atomizer is exemplified by an electronic flat cigarette, and the example structure can be seen in the embodiment shown in fig. 19.
The atomizer structure shown in fig. 19 includes a hollow outer casing 100, and the outer shape of the outer casing 100 may be designed into a regular geometric cylindrical shape (such as a cylinder, a column, etc.) or a flat shape with a thickness dimension smaller than a width dimension as shown in the embodiment of fig. 19 according to the shape requirements of different products. The lower end of the hollow case 100 is open for filling the smoke and facilitating installation of necessary atomization structures, such as the above porous heating body 400, sealing members, seats, electrode terminals, etc., inside the hollow case 100.
The inside of the outer shell 100 is provided with a smoke conveying pipe 110 arranged along the axial direction and used for conveying atomized smoke aerosol; therefore, based on the common design of the electronic cigarette product, the upper port of the smoke transport tube 110 is used as a mouthpiece for smoking, and the lower end is connected with the atomizing assembly, so as to transport the tobacco aerosol generated by the atomizing assembly to the smoker for smoking. Meanwhile, a hollow portion between an outer sidewall of the smoke transport pipe 110 and an inner sidewall of the case 100 forms an oil storage chamber 120 for storing tobacco tar.
As can be seen from the figure, the porous heating element 400 is installed at the lower end of the flue gas conveying pipe 110, the porous heating element 400 is in a dumbbell-shaped design with through holes as shown in the embodiment of FIG. 12, and a heating element is installed inside; the heat generating element has a heat generating portion 500 extending axially. Meanwhile, the porous heating body 400 and the smoke transmission pipe 110 are coaxially arranged during installation, so that the middle through hole is ensured to be more smoothly connected with the smoke transmission pipe 110. Meanwhile, in order to ensure that the heating part 500 can be subsequently communicated with a power supply component of the electronic cigarette to realize electric heating, the heating element further comprises conductive pins 800 respectively arranged at two ends of the heating part 500, two electrode terminals 810 are mounted on the plastic end cover 900, and the conductive pins 800 are correspondingly welded or in contact connection with the two electrode terminals 810, so that after the atomizer is matched with the power supply component, the electrode terminals 810 are connected with the positive and negative electrodes of the power supply component to supply power to the heating part 500.
Meanwhile, the lower end of the oil storage cavity 120 along the axial direction is provided with a silica gel seat 700, and the silica gel seat 700 is used for sealing the lower end of the oil storage cavity 120, so that the smoke oil is prevented from leaking.
Meanwhile, the plastic end cover 900 which is covered with the open end of the outer shell 100 is further arranged on the open end of the lower end of the hollow outer shell 100 and used for sealing the lower end of the hollow outer shell 100, and the shape and the connection of the plastic end cover 900 can be designed and adopted by technicians in various changes according to the purpose of sealing. Meanwhile, a stainless steel shell 910 may be further disposed at the lower end of the hollow outer shell 100 to cover the lower end and a part of the outer surface of the outer shell 100, so as to enhance the stable assembly of the internal components, and make the appearance of the product more beautiful due to the color effect of the metallic color.
On the basis of the above structure, generally, the fixation and assembly of the porous heat-generating body 400 in the atomizer product are not convenient; in view of this deficiency, the atomizer in the embodiment of the present invention is designed to fit a fixing and sealing mounting structure, an assembling and connecting structure with respect to the shape characteristics of the above dumbbell-shaped porous heat-generating body 400, see fig. 19 to fig. 20. Specifically, the connection is realized by a silica gel connector 600 and a silica gel base 700. Specifically, the fixing and assembling will be described by taking the porous heat-generating body of the embodiment shown in FIG. 12 as an example.
The silica gel connecting piece 600 is used for connecting the flue gas transmission pipe 110 and the porous heating body 400, and the porous heating body 400 is dumbbell-shaped and comprises a first porous part 10, a second porous part 20 and a third porous part 30 which are coaxially arranged in the length direction; also, the first porous portion 10 and the third porous portion 30 each have an outer diameter larger than the second porous portion 20.
A first receiving portion 710 for receiving the third porous portion 30 is provided on the silicone seat 700 based on the protruding shape of the first porous portion 10 and the third porous portion 30 at both ends compared to the second porous portion 20; the silicone rubber connector 600 is provided with a second receiving portion 620 for receiving the first porous portion 10.
Further, the first receiving portion 710 may be shaped to fit the third porous portion 30 since the third porous portion 30 has a transition-shaped outer surface with a gradually decreasing outer diameter, and may form a snap-fit connection with the third porous portion 30 due to the shape fitting; the second receiving portion 620 may be designed to be fitted to the first porous portion 10, and may be engaged with the first porous portion 10. The manner in which the snap fit is accommodated is evident from the cross-sectional view of fig. 19. Meanwhile, the silica gel connecting piece 600 and the silica gel base 700 are both made of flexible silica gel materials, and are very convenient to assemble.
The silica gel connector 600 is further provided with a connecting portion 610 connected to the smoke conveying pipe 110, and the connecting portion 610 is a slot design adapted to the shape of the smoke conveying pipe 110, as shown in the embodiment of fig. 19 and 20; during connection, the lower end of the flue gas transmission pipe 110 is inserted into the slot, so that interference fit can be stabilized, and sealing connection is formed. It should be noted that the connection portion 610 may be formed by a common tubular connection method such as a hook, a pipe clamp, and a pin, in addition to the simplest slot design described above, which is very easy for a skilled person to obtain and is not illustrated in detail.
The silica gel connecting piece 600 and the silica gel base 700 correspond to the protruding shapes of the two ends of the porous heating body 400, and can be respectively matched with the accommodating parts designed and connected for assembly, so that the fixed assembly of the porous heating body 400 can be realized; the sealing effect is better after the assembly.
Meanwhile, according to the further requirement of ensuring the smooth airflow of the flue gas circulation, a flue gas flow through hole is required to be formed in the silica gel connecting piece 600, one end of the flue gas flow through hole is communicated with the lower end of the flue gas transmission pipe 110, and the other end of the flue gas flow through hole is communicated with the axial through hole 40 of the porous heating body 400; an air inlet through hole is formed in the silica gel base 700 according to the existing common mode, so that the external air can enter, and the air flow in the atomizer is smooth in circulation.
Meanwhile, the silica gel base 700 is used as a fixing base of the porous heating element 400, and the porous heating element itself needs to be fixed, and the silica gel base can be directly pressed by the plastic end cover 900 or fixed by abutting against the inner wall of the outer shell 100; or when the plastic end cap 900 is integrated with the outer casing 100 in other types of atomizers, it can be regarded that the outer casing 100 has an abutting portion for abutting/mounting the silicone base 700 as a whole, and then the silicone base 700 is abutted and fixed with the abutting portion.
In the above embodiment, the outer surface of the porous heating element 400 in the atomizer can be covered with a layer of cellucotton/non-woven fabric, so as to prevent the porous heating element made of ceramic and the like from soaking tobacco tar for a long time to fall powder, and doping in aerosol generated by atomization, which affects the smoking taste.
In the above example of fixedly mounting the porous heat-generating body shown in fig. 12, the multi-hole deformed porous heat-generating body shown in fig. 15 to 18 can be mounted similarly in the above configuration.
By adopting the atomizer of the embodiment of the invention, the parts protruding from the two ends of the porous heating body are matched with the connecting and assembling parts made of the added silica gel material for corresponding connection and assembly, so that convenient installation and sealing are realized; meanwhile, the dumbbell-shaped porous heating body is beneficial to enhancing the oil guiding performance of the middle part, and after the heating body is arranged at the position, the smoke output and the smoke output efficiency can be enhanced.
Based on the structure and the idea of improving the whole pore space and the smoke output, the invention further provides a porous body with higher tobacco tar conduction and smoke output efficiency, and the preparation method comprises the following steps:
s10, obtaining the raw materials according to the following components in percentage by mass: 50-75% of diatomite, 0-10% of alumina, 15-35% of pore-forming agent, 5-10% of clay and 5-15% of glass powder;
s20, mixing the raw materials with paraffin evenly to prepare a raw material wax block;
s30, pressing and forming the raw material wax block obtained in the step S20 according to the shape of a final required product to obtain a green body;
s40, insulating the green blank at 200-500 ℃ for 4-10 h, and sintering at 700-1200 ℃ for 2-4 h to obtain the porous body.
In the preparation process, the components which are matched and selected in the step S10 through specificity are taken as the original porous body, the diatomite is taken as the ceramic main material, and the pore-forming agent is used for forming pores in the sintering process; the glass powder and the alumina are matched to adjust and change the properties of rigidity, hardness and the like, and finally a relatively suitable porous body is formed. The pore-forming agent is selected from at least one of sucrose, starch, wood fiber and short carbon fiber; the starch, the cane sugar, the wood fiber and the short carbon fiber which are complex organic matters or inorganic matters with large particle sizes are used as pore forming agents, the pore size and the porosity of the finally formed porous ceramic can be controlled according to requirements, and a communicating pore structure suitable for storing, conducting liquid and generating smoke is obtained.
And the glass powder adopts high-temperature glass powder (the melting point is 800-1300 ℃) instead of low-temperature glass powder (the melting point is 320-600 ℃) based on the combination of all components in the final sintering process and the property requirement of the final porous body.
Step S20, taking paraffin as a forming binder medium, mixing and binding the raw materials with the paraffin to form a raw material wax block, and then performing subsequent sintering; when the step S20 is performed, the materials in the step S10 may be mixed into a mixture, and then paraffin wax is melted into a liquid at 80 ℃, and then the mixed powder is poured into the mixture and cooled while being stirred, so that the mixed powder and the paraffin wax are uniformly wrapped to prepare the raw material wax block.
Step S30, further pressing and forming the raw material wax block to form a final product preliminary shape; the pressing and forming process can be carried out by adopting a forming machine, and when the pressing and forming process is implemented, the raw material wax block is converted into wax cake slurry at the temperature of 70-85 ℃ and under the pressure of 0.4-1 MPa, and then the wax cake slurry is injected into a mold to obtain the porous body forming green body with the required shape.
And finally, the firing process of the step S40 is divided into two steps, degreasing is carried out at 200-500 ℃ to remove the paraffin binder in the blank, and then sintering is carried out at 700-1200 ℃ to obtain the porous body with the required shape, pores and pore diameter.
Meanwhile, in the implementation of the steps, in order to make the quality of the final preparation better, some detail processing steps which promote the quality better can be added; in particular, the method comprises the steps of,
before step S20, the method includes:
s11, pouring the diatomite, the alumina, the pore-forming agent, the clay and the glass powder into a planetary ball mill according to the mixture ratio, performing wet ball milling for 5 hours, wherein a ball milling medium adopts deionized water or absolute ethyl alcohol, and performing ball milling to enable the materials to be more uniform, so that uniform mixed powder is finally obtained.
In order to make the details of the above method for preparing the porous body of the present invention more easily understood and implemented by those skilled in the art, and to highlight the effect of the porous body prepared in the present application on the improvement of performance and quality, the contents of the above method are illustrated below by specific examples.
Example 1
S10, obtaining the following raw material components in percentage by mass: 70g of diatomite, 3g of alumina, 15g of wood fiber pore-forming agent, 5g of clay and 7g of high-temperature glass powder;
s11, pouring the raw materials obtained in the step S10 into a planetary ball mill for wet ball milling for 5 hours, wherein a ball milling medium is deionized water, and uniform mixed powder is obtained;
s20, melting proper amount of paraffin into liquid at 80 ℃, pouring the liquid into the mixed powder of the step S11, cooling the mixed powder while stirring, and uniformly wrapping the mixed powder and the paraffin to prepare a raw material wax cake;
s30, pouring the raw material wax cake into a forming machine, controlling the temperature at 70 ℃ and the pressure at 0.4MPa, and injecting the wax cake slurry into a mold with a shape corresponding to the porous body in the embodiment shown in the figure 1 to obtain a formed green body;
s40, preserving the temperature of the molded green body at 200 ℃ for 10h, and then sintering at 700 ℃ for 4h to obtain the sintered porous body.
Example 2
S10, obtaining the following raw material components in percentage by mass: 65g of diatomite, 25g of a sucrose pore-forming agent, 5g of clay and 5g of high-temperature glass powder;
s11, pouring the raw materials obtained in the step S10 into a planetary ball mill for wet ball milling for 4 hours, wherein a ball milling medium is absolute ethyl alcohol, and uniform mixed powder is obtained;
s20, melting proper amount of paraffin into liquid at 80 ℃, pouring the liquid into the mixed powder of the step S11, cooling the mixed powder while stirring, and uniformly wrapping the mixed powder and the paraffin to prepare a raw material wax cake;
s30, pouring the raw material wax cake into a forming machine, controlling the temperature to be 85 ℃ and the pressure to be 1MPa, and injecting the wax cake slurry into a mold with a shape corresponding to the porous body in the embodiment shown in the figure 1 to obtain a formed green body;
s40, preserving the temperature of the molded green body at 500 ℃ for 4h, and then sintering at 1200 ℃ for 2h to obtain the sintered porous body.
Example 3
S10, obtaining the following raw material components in percentage by mass: 58g of diatomite, 5g of alumina, 20g of sucrose pore-forming agent, 5g of clay and 12g of high-temperature glass powder;
s11, pouring the raw materials obtained in the step S10 into a planetary ball mill for wet ball milling for 4 hours, wherein a ball milling medium is absolute ethyl alcohol, and uniform mixed powder is obtained;
s20, melting proper amount of paraffin into liquid at 80 ℃, pouring the liquid into the mixed powder of the step S11, cooling the mixed powder while stirring, and uniformly wrapping the mixed powder and the paraffin to prepare a raw material wax cake;
s30, pouring the raw material wax cake into a forming machine, controlling the temperature at 80 ℃ and the pressure at 0.8MPa, and injecting the wax cake slurry into a mold with a shape corresponding to the porous body in the embodiment shown in the figure 1 to obtain a formed green body;
s40, preserving the temperature of the molded green body at 300 ℃ for 6h, and then sintering at 1000 ℃ for 3h to obtain the sintered porous body.
Example 4
S10, obtaining the following raw material components in percentage by mass: 55g of diatomite, 10g of alumina, 15g of a sucrose pore-forming agent, 10g of clay and 10g of high-temperature glass powder;
the remaining steps were carried out in the same manner as in example 3 to obtain a finally sintered porous body.
In order to verify the properties of the porous bodies prepared in the above examples, the pores and pore diameters were measured by scanning electron microscopy, and the results are shown in the following table:
| examples | Porosity of the material | Average pore diameter |
| Example 1 | 65％ | 61μm |
| Example 2 | 78％ | 67μm |
| Example 3 | 70％ | 63μm |
| Example 4 | 72％ | 64μm |
Therefore, the detection results of the pore diameter and the porosity of the micropores show that the porosity of the porous body prepared by the embodiment of the invention basically reaches 70 percent, and is 30-60 percent compared with the porosity of a common ceramic rod; fig. 22 shows the results of microscopic analyses of the cross-sections of the porous body of example 4 and the ordinary ceramic rod, respectively, at 200-fold magnification. In FIG. 22, the porous body of example 4 is shown in the left half and a commercially available ordinary ceramic rod is shown in the right half, and the microscopic analysis result of the ordinary ceramic rod having an aperture of 64.52 μm in example 4 and an aperture of 46.49 μm in example 4 is shown from the results. Compared with the common ceramic rod, the porous body prepared by the invention is easy and quick to smoke on the electronic cigarette and has relatively large smoke amount.
It should be noted that the preferred embodiments of the present invention are shown in the specification and the drawings, but the present invention is not limited to the embodiments described in the specification, and further, it will be apparent to those skilled in the art that modifications and changes can be made in the above description, and all such modifications and changes should fall within the protection scope of the appended claims.
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