阅读说明：本技术 一种不燃烧卷烟加热器导热管的设计方法 (Design method of heat conduction pipe of non-combustion cigarette heater ) 是由 阮艺斌 邓波 张小涛 王维维 黄新民 刘剑 于 2019-10-29 设计创作，主要内容包括：本发明提供的一种不燃烧卷烟加热器导热管的设计方法；步骤为：本发明通过三维建模有效对导热管结构进行分析使不燃烧卷烟加热器通过在加热器导热管上设置开孔,可实现有效加热区实时迁移；有效加热区的迁移可逐步对新鲜烟草材料进行加热,提高烟草材料在抽吸过程中的加热均匀性；加热器导热管上设置开孔可降低热量的迁移速度,保证加热器局部温度的快速上升,提高烟草材料的加热效率,减少抽吸预热时间；有效减少初始加热的烟草材料量,降低第一口或第二口抽吸时烟碱的释放量,降低劲头和刺激性,改善抽吸体验。(The invention provides a design method of a heat conduction pipe of a non-combustion cigarette heater; the method comprises the following steps: according to the invention, the structure of the heat conduction pipe is effectively analyzed through three-dimensional modeling, so that the non-combustible cigarette heater can realize real-time migration of an effective heating area by arranging the opening on the heat conduction pipe of the heater; the transfer of the effective heating area can gradually heat the fresh tobacco material, so that the heating uniformity of the tobacco material in the smoking process is improved; the arrangement of the holes on the heat conducting pipe of the heater can reduce the migration speed of heat, ensure the rapid rise of the local temperature of the heater, improve the heating efficiency of tobacco materials and reduce the suction preheating time; effectively reduce the amount of tobacco material that is initially heated, reduce the amount of nicotine released during the first or second puff, reduce strength and irritation, improve the smoking experience.)

1. A design method of a heat conduction pipe of a non-combustion cigarette heater comprises the following steps:

1) designing the shape structure of the heat conduction pipe according to the cigarette and the heater of the non-combustible cigarette;

2) establishing a three-dimensional building model of the heat conduction pipe by using a three-dimensional software drawing;

3) establishing variables on the heat conduction pipe, which influence the temperature of the heat conduction pipe, in a three-dimensional model of the heat conduction pipe and carrying out finite element analysis;

4) and selecting an optimal structure and testing.

2. The method for designing a heat pipe of a non-combustible cigarette heater according to claim 1, characterized in that: the variables influencing the temperature of the heat conduction pipe comprise the length of the heat conduction pipe, the installation quantity of the heaters, the position of the hole formed in the heat conduction pipe and the structure of the hole.

3. The method for designing a heat pipe of a non-combustible cigarette heater according to claim 1, characterized in that: the heat conduction pipe is in a cylinder shape, and two opposite outer walls of the cylinder are provided with outer edge platforms.

4. The method for designing a heat pipe of a non-combustible cigarette heater according to claim 2, characterized in that: the heat conduction pipe is 4.55-6.55 mm in inner diameter, 35-55 mm in length and 0.15-0.35 mm in thickness.

5. The method for designing a heat pipe of a non-combustible cigarette heater according to claim 2, characterized in that: the heater is characterized in that the position of the opening on the heat conduction pipe is equal to the installation position of the heater, the shape of the opening is rectangular, the width of the opening is 2-5 mm, and the length of the opening is 4-12 mm.

6. The method for designing a heat pipe of a non-combustible cigarette heater according to claim 2, characterized in that: the number of the heaters is 2.

7. The method for designing a heat pipe of a non-combustible cigarette heater according to claim 5, wherein: the number of the holes is 1-4.

8. The method for designing a heat pipe of a non-combustible cigarette heater according to claim 2, characterized in that: the holes are uniformly distributed along the axial direction of the heat conduction pipe and are arranged at one end far away from the heat source.

Technical Field

The invention relates to a design method of a heat conduction pipe of a non-combustion cigarette heater.

Background

The cigarette is heated to provide nicotine and tobacco characteristic aroma to consumers by heating the non-burning tobacco. Because the tobacco material does not participate in combustion, the heating temperature is lower than 500 ℃, and the release amount of harmful substances generated by high-temperature cracking in the mainstream smoke is greatly reduced; meanwhile, the tobacco material is in a relatively closed space in the heating process, and basically has no side-stream smoke, so that the harm of second-hand smoke is greatly reduced. Related products in the market at present mainly adopt an electric heating mode, such as fimoiqos smoking tools, Glo of tobaccos of English and American, and the like. However, the main heating smoking set in the market generally has a problem that the heating area of the smoking set is fixed, the position of a cigarette is also fixed in the heating process, and the situation of repeatedly heating the tobacco material occurs, so that the phenomenon of inconsistent smoking of the smoke of the heated non-combustible cigarette is caused. Taking Glo as an example for matching with the smoke analysis of cigarettes, the nicotine has an obvious gradual descending trend. In order to solve the problem, a sectional heating technology is adopted, but the smoke of the smoke generally has a two-section descending trend.

Disclosure of Invention

In order to solve the technical problem, the invention provides a design method of a heat conduction pipe of a non-combustion cigarette heater.

The invention is realized by the following technical scheme.

The invention provides a design method of a heat conduction pipe of a non-combustion cigarette heater; the method comprises the following steps:

1, designing the shape structure of a heat conduction pipe according to a cigarette and a heater of a non-combustible cigarette;

2, establishing a three-dimensional building model of the heat conduction pipe by using a three-dimensional software drawing;

3, establishing variables on the heat conduction pipe, which influence the temperature of the heat conduction pipe, in a three-dimensional model of the heat conduction pipe and carrying out finite element analysis;

4 selecting the optimal structure and testing.

The variables influencing the temperature of the heat conduction pipe comprise the length of the heat conduction pipe, the installation quantity of the heaters, the position of the hole formed in the heat conduction pipe and the structure of the hole.

The heat conduction pipe is in a cylinder shape, and two opposite outer walls of the cylinder are provided with outer edge platforms.

The heat conduction pipe is 4.55-6.55 mm in inner diameter, 35-55 mm in length and 0.15-0.35 mm in thickness.

The heater is characterized in that the position of the opening on the heat conduction pipe is equal to the installation position of the heater, the shape of the opening is rectangular, the width of the opening is 2-5 mm, and the length of the opening is 4-12 mm.

The number of the heaters is 1-2.

The number of the holes is 1-4.

The holes are uniformly distributed along the axial direction of the heat conduction pipe and are arranged at one end far away from the heat source

The invention has the beneficial effects that: the structure of the heat conduction pipe is effectively analyzed through three-dimensional modeling, so that the non-combustible cigarette heater can realize real-time migration of an effective heating area by arranging the opening on the heat conduction pipe of the heater; the transfer of the effective heating area can gradually heat the fresh tobacco material, so that the heating uniformity of the tobacco material in the smoking process is improved; the arrangement of the holes on the heat conducting pipe of the heater can reduce the migration speed of heat, ensure the rapid rise of the local temperature of the heater, improve the heating efficiency of tobacco materials and reduce the suction preheating time; effectively reduce the amount of tobacco material that is initially heated, reduce the amount of nicotine released during the first or second puff, reduce strength and irritation, improve the smoking experience.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a steady state cloud diagram of the temperature field of a single-hole heat pipe;

FIG. 3 is a graph of a comparison of the minimum temperature of a single bore heat pipe;

FIG. 4 is a heat pipe temperature field profile at different times;

FIG. 5 is a graph of comparative analysis of heating effects;

FIG. 6 is a steady state temperature field profile of a porous heat pipe;

FIG. 7 is a temperature field distribution diagram of the porous heat conducting pipe at different times;

FIG. 8 is a graph of transient temperature rise of a porous heat pipe;

FIG. 9 is a steady state temperature field profile of a heat pipe of different materials;

figure 10 is a graph of transient temperature rise of different materials of heat pipes.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

A design method of a heat conducting pipe of a non-combustion cigarette heater; comprises the steps of (a) preparing a mixture of a plurality of raw materials,

designing the shape structure of the heat conduction pipe according to the cigarette and the heater of the non-combustible cigarette;

establishing a three-dimensional building model of the heat conduction pipe by using a three-dimensional software drawing;

establishing variables on the heat conduction pipe, which influence the temperature of the heat conduction pipe, in a three-dimensional model of the heat conduction pipe and carrying out finite element analysis;

and selecting an optimal structure and testing.

The variables influencing the temperature of the heat conduction pipe comprise the length of the heat conduction pipe, the installation quantity of the heaters, the position of the hole formed in the heat conduction pipe and the structure of the hole.

The heat conduction pipe is in a cylinder shape, and two opposite outer walls of the cylinder are provided with outer edge platforms.

Fig. 1 is the original model of heat pipe, and the heat pipe internal diameter is 5.45mm, and length is 40mm, and thickness is 0.25mm, and outer fringe platform width is 3mm, and length is 40mm, and the heating plate is 15mm 3mm 0.3 mm's rectangle thin slice, and the platform is followed the terminal surface laminating with the heat pipe.

Because the influence of the size and the position of the opening on the heat pipe on the distribution of the temperature field needs to be analyzed, the heaters with different positions and different large and small holes need to be modeled respectively, and the shape of the opening is temporarily determined to be a rectangle in consideration of the difficulty of later processing. The specific parameters of the apertured heat pipes are shown in tables 1 and 2.

TABLE 1 Single-hole Heat-conducting pipe size parameters

TABLE 2 porous Heat pipes dimensional parameters

Since only thermal analysis of the heat pipe is required, only the following parameters are required:

TABLE 3 physical Properties of various materials

Setting simulation parameters:

in order to facilitate calculation and consider the limitation of calculation resources, the model needs to be reasonably simplified, the volume of the heating sheet is ignored, the heat source is simplified into a constant temperature surface heat source, the temperature is constant at 220 ℃, and the transient calculation time step length is 0.01 s. And respectively carrying out steady-state thermal analysis and transient thermal analysis on each model.

The heat conduction pipe is 4.55-6.55 mm in inner diameter, 35-55 mm in length and 0.15-0.35 mm in thickness.

The heater is characterized in that the position of the opening on the heat conduction pipe is equal to the installation position of the heater, the shape of the opening is rectangular, the width of the opening is 2-5 mm, and the length of the opening is 4-12 mm.

The number of the heaters is 2.

The number of the holes is 1-4.

Steady state thermal analysis is typically used to determine the initial temperature conditions for transient analysis, i.e., after the simulated transient heat transfer effect has completely disappeared. Fig. 2 is a cloud chart of steady state analysis of a single-hole heat pipe, because transient heat transfer effect is not considered, the heat absorption and heat dissipation are balanced at the moment, the heat conduction effect is not only influenced by the holes, but also the heat capacity of the heat pipe and the heat exchange efficiency between the heat pipe and air are influenced, and the temperature field of the heating pipe is in gradient distribution along the long axis direction.

FIG. 3 is a comparison of the lowest temperatures of single-hole heat pipes, it can be seen from the graphs that the steady-state lowest temperatures of the heat pipes with holes are all lower than the steady-state lowest temperatures of the heat pipes without holes, and from 1-2, 1-3, 1-4, 1-5, and 1-6, the lowest temperatures are gradually reduced with the increase of the sizes of the holes, and from 1-3, 1-5, and 1-6, the lengths (arc lengths) of the holes are not changed, and the lowest temperatures are slightly reduced with the increase of the widths of the holes. As can be seen, the arc length of the opening has a stronger effect on the heat transfer effect than the width of the opening.

The temperature field of the heat pipe at different times is analyzed, and the distribution of the temperature field at different times is shown in FIG. 4.

Fig. 5 shows the comparison of heating effects in transient heating processes of 1-1, 1-2, 1-3, 1-4, 1-5 and 1-6, wherein the temperature is the lowest temperature of the heater. As can be seen from the figure, the initial temperature is 22 ℃ at room temperature, and the temperature rise rate is gradually reduced along with the increase of the size (arc length) of the opening compared with 1-1, 1-2, 1-3 and 1-4; comparing 1-3, 1-5, and 1-6, it can be seen that as the opening width increases, the rate of temperature rise decreases, but the magnitude of the decrease is small. Indicating that the effect of the aperture arc length on the rate of temperature rise is much greater than the aperture width.

As shown in fig. 6, the temperature field distributions of the heat pipes with different opening numbers are not greatly different, and as the number of the openings increases, the lowest temperature on the heat pipe slightly decreases, which indicates that the number of the openings has no significant influence on the steady-state temperature field distribution of the heat pipe.

Taking 2-3 as an example, the temperature field distributions of the porous heat pipe at different times are analyzed, and the cloud charts of the temperature fields of the porous heat pipe at different times are shown in fig. 7.

FIG. 8 is a comparison of heating effects in transient heating processes of 2-1, 2-2, 2-3 and 2-4, wherein the temperature is the lowest temperature of the heater. As can be seen, the initial temperature was 22 ℃ at room temperature, and the temperature increase rate decreased gradually with the increase in the number of openings.

Steady state thermal analysis:

fig. 9 shows the steady-state temperature field distribution of the heat pipes made of different materials, and assuming that the convection heat transfer coefficients of the three materials and the still air are the same, it can be seen from the figure that the lowest temperature of the H59 heat pipe is 201.69 ℃, the lowest temperature of the stainless steel heat pipe is 125.28 ℃, and the lowest temperature of the alumina ceramic heat pipe is 140.9 ℃, so that the heat transfer coefficient of the material has a large influence on the steady-state temperature field distribution of the heat pipe, and the heat capacity has a small influence on the steady-state temperature field distribution of the.

Fig. 10 is a comparison of the heating effect of H59, stainless steel, and alumina ceramic heat pipe during transient heating process, wherein the temperature is the lowest temperature of the heater. It can be seen that the rate of temperature rise of the H59 heat pipe is much higher than that of the other two materials, and the material thermal conductivity plays a key role in the middle.

The holes are uniformly distributed along the axial direction of the heat conduction pipe and are arranged at one end far away from the heat source.