CN211353917U - Heating device for low-temperature cigarette - Google Patents

Abstract

The utility model discloses a heating device for low-temperature cigarettes, which comprises a base, a heating part and a barrel body with openings at two ends; the base is used for supporting a low-temperature cigarette, separating a flame from the low-temperature cigarette and transferring heat from the flame to the heating part; the heating part is provided with a cavity for containing tobacco, the bottom end of the heating part is connected with the base, and the heating part is inserted into the low-temperature cigarette to heat the low-temperature cigarette; the barrel is sleeved outside the heating part at intervals, an interlayer used for fixing the low-temperature cigarettes is formed between the inner wall of the barrel and the outer wall of the heating part, and the bottom end of the barrel is connected with the base. The utility model discloses can increase the area of contact with the low temperature cigarette to make the heat more for transmitting the tobacco uniformly, improve the temperature homogeneity of low temperature cigarette, and average temperature is high, thereby can improve the heating effect.

Description

A heating device for low temperature cigarettes

technical field

The utility model relates to a heating device for low-temperature cigarettes, belonging to the technical field of low-temperature cigarettes.

Background technique

Low-temperature cigarettes, also known as heat-not-burn tobacco products, are different from traditional cigarettes by burning the tobacco itself to generate smoke. The tobacco of low-temperature cigarettes does not burn itself, but is heated by a heater, so that the nicotine (nicotine) in it is released in the form of smoke for people to smoke, resulting in a physiological pleasure. Therefore, the harm of low temperature cigarettes to the human body is much lower than that of traditional direct burning cigarettes.

At present, the heating methods of low-temperature cigarettes are mostly electric heating methods, and the heating elements are mainly in the shape of needles (rods) and sheets, and the resistance wires or sheets are directly buried in the heating needles and heating sheets. However, the electric heating method has the following disadvantages: due to the low energy density of the lithium battery, usually only one charge can guarantee the smoking time of one cigarette, and the continuous smoking performance is poor; at the same time, the heating element used in the electric heating method is usually Heating rods or heating sheets with high thermal conductivity, and because the thermal conductivity of tobacco is very low, the temperature uniformity inside the cigarette is poor, and the temperature in the center often exceeds 350 ° C and the temperature at the periphery has not yet reached 220 ° C. Not conducive to reducing the release of tobacco harmful substances.

Although the relevant technical personnel have proposed the solution of heating liquid smoke or shredded tobacco with the heat released by fuel combustion, for example, Chinese patent application CN201420057088.6 discloses a lighter-type fuel-heated cigarette, and Chinese patent application CN201621111124.8 discloses a A gas-heated smoking article, the above two patents both use the combustion of liquid fuels such as butane to indirectly heat low-temperature cigarettes, but these heating components based on fuel combustion still adopt a structure similar to that of electric heating. Larger changes greatly affect the heating efficiency, the speed of smoking during use, and the uniformity of cigarette baking, thereby indirectly affecting the user's smoking experience and the amount of harmful substances produced.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a heating device for low-temperature cigarettes, which can increase the contact area with the low-temperature cigarettes, so that the heat is more uniformly transferred to the tobacco, and the temperature uniformity of the low-temperature cigarettes is improved. , and the average temperature is high.

In order to achieve the above purpose, the present utility model proposes a heating device for low-temperature cigarettes, which is characterized in that it comprises a base, a heating part and a cylinder with openings at both ends; wherein, the base is used to support the low-temperature cigarette, and the flame It is separated from the low-temperature cigarette, and transfers the heat from the flame to the heating part; the interior of the heating part is provided with a cavity for accommodating tobacco, and the bottom end of the heating part is connected with the base , the heating part is used to be inserted inside the low-temperature cigarette to heat the low-temperature cigarette; the cylinder body is sleeved on the outside of the heating part at intervals, and the inner wall of the cylinder body is connected to the heating part. An interlayer for fixing the low-temperature cigarette is formed between the outer walls, and the bottom end of the barrel is connected with the base.

In a specific embodiment, the cavity penetrates the top and bottom ends of the heating part.

In a specific embodiment, a slit portion is opened on the bottom side wall of the heating portion.

In a specific embodiment, the number of the slit parts is multiple, and the multiple slit parts are arranged at intervals.

In a specific embodiment, the number of the slits is 4-8.

In a specific embodiment, the width of the slit portion is 0.5-2 mm, and the length of the slit portion is 2-8 mm.

In a specific embodiment, the cross-section of the heating portion is configured as a circular ring, a petal-shaped ring or a polygonal ring.

In a specific embodiment, the outer diameter of the heating portion is 1/2˜3/4 of the inner diameter of the cylinder.

In a specific embodiment, the outer diameter of the heating portion is 4-6 mm.

In a specific embodiment, the thickness of the side wall of the heating portion is 0.1-1 mm.

In a specific embodiment, the thickness of the top side wall of the heating part is smaller than the thickness of the bottom side wall of the heating part.

In a specific embodiment, the top of the heating part is provided with a tip.

In a specific embodiment, the length of the heating portion is 1/2 to 4/5 of the length of the cylinder.

In a specific embodiment, the length of the heating portion is 9-15 mm.

In a specific embodiment, the heating part is made of one or more materials selected from red copper, brass, aluminum, aluminum oxide and silicon carbide.

In a specific embodiment, the thermal conductivity of the heating part is 271-504 W/m·Kelvin, the specific heat capacity of the heating part is 2.436-4.524 J/cm3·Kelvin, and the density of the heating part is 6285 ~11671 kg/m3.

In a specific embodiment, the base is made of thermally conductive material.

In a specific embodiment, the base is made of one or more materials selected from red copper, brass, aluminum, aluminum oxide and silicon carbide.

In a specific embodiment, the cylinder body is made of ceramic material.

In a specific embodiment, the equivalent thermal conductivity of the low-temperature cigarette is 0.05-0.092 W/m·Kelvin, the equivalent specific heat capacity of the low-temperature cigarette is 0.3322-0.617 J/cm·Kelvin, and the low-temperature cigarette has The equivalent bulk density is 350 to 650 kg/m3.

The utility model has the following advantages due to the adoption of the above technical solutions: 1. The interior of the heating portion of the present utility model is provided with a cavity for accommodating tobacco, so that the contact area between the heating portion and the low-temperature cigarette can be increased, so that the heat is more It is uniformly transferred into the tobacco, improves the temperature uniformity of low-temperature cigarettes, and the average temperature is high, so that the heating effect can be improved. 2. The utility model can improve the thermal efficiency of fuel heating, thereby reducing the fuel consumption rate and improving the multi-branch continuous pumping capacity of the heating device. 3. The cavity of the present invention penetrates the top and bottom ends of the heating part, which can further increase the contact area between the heating part and the low-temperature cigarette, so that the heat can be transferred to the tobacco more uniformly, and the temperature uniformity of the low-temperature cigarette can be further improved. 4. The bottom side wall of the heating part of the present invention is provided with a plurality of slits, which can increase the contact area between the heating part and the tobacco, and facilitate the flow of air into the tobacco in the heating part to generate smoke. 5. The plurality of slits of the present invention are arranged at intervals, which can effectively increase the contact area between the heating part and the tobacco, and further facilitate the flow of air into the tobacco to generate smoke, thereby further improving the temperature uniformity of the low-temperature cigarette. 6. The outer diameter of the heating part of the present invention is 1/2 to 3/4 of the inner diameter of the cylinder, which can improve the heating uniformity and reduce the time required for preheating low-temperature cigarettes. 7. The thickness of the side wall of the heating part of the present invention is 0.1-1 mm, which can further improve the heating uniformity and at the same time further reduce the time required for the preheating of low-temperature cigarettes. 8. The thickness of the top side wall of the heating part of the present invention is smaller than the thickness of the bottom side wall of the heating part, which can facilitate the insertion of the heating part into the low temperature cigarette. 9. The top of the heating part of the present invention is provided with a tip, which can further facilitate the insertion of the heating part into the low temperature cigarette. 10. The length of the heating part of the present invention is 1/2 to 4/5 of the length of the cylinder, which can further improve the heating uniformity and at the same time further reduce the time required for the preheating of low-temperature cigarettes. 11. The utility model has the advantages of simple structure, convenient use and broad market prospect.

Other features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the accompanying drawings required in the description of the embodiments will be briefly introduced below:

1 is a schematic structural diagram of a specific embodiment of the heating device for low-temperature cigarettes of the present invention (for convenience of presentation, the cylinder body is only shown in half divided along its longitudinal axis);

2 is a schematic structural diagram of another specific embodiment of the heating device for low-temperature cigarettes of the present invention (for convenience of presentation, the cylinder body is only shown in half divided along its longitudinal axis);

3 is a schematic diagram of the variation of the maximum temperature of low-temperature cigarettes with time in the heating device of a specific embodiment of the present invention;

4 is a schematic diagram of the variation of the average temperature of low-temperature cigarettes with time in the heating device of a specific embodiment of the present invention;

FIG. 5 is a schematic diagram of the variation of the temperature uniformity coefficient of the low-temperature cigarette in the heating device with time according to a specific embodiment of the present invention;

FIG. 6 is a schematic diagram showing the variation of the temperature uniformity coefficient of low-temperature cigarettes with time in the heating device with the outer diameter of the heating part in the preferred range of 4-6 mm according to a specific embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so as to fully understand and implement the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects. It should be noted that, as long as there is no conflict, each embodiment of the present invention and each feature of each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

As shown in Figures 1 and 2, the heating device for low-temperature cigarettes proposed by the present invention includes a base 1, a heating portion 2 and a cylinder 3 with openings at both ends. Wherein, the base 1 is used to support the low-temperature cigarette, and separate the flame from the low-temperature cigarette, so as to prevent the low-temperature cigarette from being ignited by the flame. And the base 1 can absorb the heat released by the combustion of the fuel, and transfer the heat to the heating part 2 . The heating part 2 is provided with a cavity 21 for accommodating tobacco. The cavity 21 makes the inner and outer surfaces of the heating part 2 respectively contact with the low temperature cigarette, thereby increasing the contact area between the heating part 2 and the low temperature cigarette. The bottom end of the heating part 2 is connected to the base 1 . The heating part 2 is used to be inserted into the low temperature cigarette to heat the low temperature cigarette. The cylinder body 3 is sleeved on the outside of the heating part 2 at intervals, an interlayer 4 for fixing the low temperature cigarette is formed between the inner wall of the cylinder body 3 and the outer wall of the heating part 2, and the bottom end of the cylinder body 3 is connected with the base 1 to heat the low temperature cigarette, The cylindrical body 3 can reduce the heat dissipation from the side portion of the low-temperature cigarette to the external environment. When in use, the base 1 is heated by the heat generated by burning the liquid fuel, and then the heat is conducted vertically inside the heating part 2, and the tobacco is heated through the inner and outer surfaces of the heating part 2 (the inner and outer surfaces of the heating part 2). able to transfer heat to tobacco separately). Compared with the heating needle (rod) structure, the heating part 2 with the cavity 21 can increase the contact area with the low-temperature cigarette, so that the heat can be transferred to the tobacco more uniformly, and the temperature uniformity of the low-temperature cigarette can be improved, and The average temperature is high, so that the heating effect can be improved. Further, the heating device can improve the thermal efficiency of fuel heating, thereby reducing the fuel consumption rate and improving the multi-branch continuous pumping capability of the heating device.

In a specific embodiment, the cavity 21 penetrates the top and bottom ends of the heating part 2, which can further increase the contact area between the heating part 2 and the low-temperature cigarette, so that the heat can be transferred to the tobacco more uniformly, and further improve the low-temperature cigarette. temperature uniformity.

In a specific embodiment, the cross section of the heating part 2 is set as a circular ring (as shown in FIG. 1 ), a petal-shaped ring (as shown in FIG. 2 ) or a polygonal ring.

In a specific embodiment, the bottom side wall of the heating part 2 is provided with a slit part 22, which can facilitate the flow of air into the tobacco in the heating part 2 to generate smoke.

In a specific embodiment, the number of the slit parts 22 is multiple. The plurality of slit parts 22 are arranged at intervals, which can effectively increase the contact area between the heating part 2 and the tobacco in the low-temperature cigarette, and can further facilitate the flow of air into the tobacco in the heating part 2 to generate smoke, thereby further improving the low-temperature cigarette. temperature uniformity.

In a specific embodiment, the bottom side wall of the heating part 2 is provided with 4-8 elongated slit parts 22 .

In a specific embodiment, the width of the slit portion 22 is 0.5-2 mm, and the length of the slit portion 22 is 2-8 mm.

In a preferred embodiment, the width of the slit portion 22 is 1 mm, and the length of the slit portion 22 is 6 mm.

In a specific embodiment, the outer diameter of the heating portion 2 is 1/2˜3/4 of the inner diameter of the cylinder 3 , which can improve the heating uniformity and reduce the time required for preheating the low-temperature cigarette.

In a specific embodiment, the outer diameter of the heating part 2 is 4-8 mm.

In a specific embodiment, the thickness of the side wall of the heating part 2 is 0.1-1 mm, which can further improve the heating uniformity and at the same time further reduce the time required for the preheating of the low-temperature cigarette.

In a preferred embodiment, the thickness of the side wall of the heating part 2 is 0.8 mm.

In a specific embodiment, the thickness of the top side wall of the heating part 2 is smaller than the thickness of the bottom side wall of the heating part 2, which can facilitate the insertion of the heating part 2 into the low temperature cigarette.

In a specific embodiment, the top of the heating part 2 is provided with a tip, which can further facilitate the insertion of the heating part 2 into the low temperature cigarette.

In a specific embodiment, the length of the heating portion 2 is 1/2 to 4/5 of the length of the cylindrical body 3, which can further improve the heating uniformity and further reduce the time required for preheating the low-temperature cigarette.

In a preferred embodiment, the outer diameter of the heating part 2 is 1/2-3/4 of the inner diameter of the cylindrical body 3, the length of the heating part 2 is 1/2-4/5 of the length of the cylindrical body 3, and the heating part The thickness of the side wall of 2 is 0.1-1 mm, which can maximize the heating uniformity and reduce the time required for the preheating of the low-temperature cigarette.

In a specific embodiment, the length of the heating part 2 is 9-15 mm. Preferably, the length of the heating part 2 is 12 mm.

In a preferred embodiment, the length of the heating portion 2 is 12 mm, the outer diameter of the heating portion 2 is 6 mm, and the thickness of the side wall of the heating portion 2 is 0.17 mm.

In another preferred embodiment, the outer diameter of the heating portion 2 is 5.5 mm, and the thickness of the side wall of the heating portion 2 is 0.19 mm. At this time, the uniformity of the temperature distribution in the low temperature cigarette reaches a maximum value.

In a specific embodiment, the heating part 2 is made of one or more materials selected from red copper, brass, aluminum, aluminum oxide and silicon carbide.

In a specific embodiment, the thermal conductivity of the heating part 2 is 271-504 W/m·K (W/m·Kelvin), and the specific heat capacity of the heating part 2 is 2.436-4.524 J/cm ³ ·K (joules/cubic centimeter·K). Kelvin), and the density of the heating part 2 is 6285-11671 kg/m ³ (kg/m3). Preferably, the thermal conductivity of the heating portion 2 is 387.6 W/m·Kelvin, the specific heat capacity of the heating portion 2 is 3.4799 J/cm3·Kelvin, and the density of the heating portion 2 is 8978 kg/m3.

In a specific embodiment, the length of the cylindrical body 3 is 16.9-31.5 mm (millimeters), and the inner diameter of the cylindrical body 3 is 5.6-10.4 mm. Preferably, the length of the cylindrical body 3 is 24.2 mm; the inner diameter of the cylindrical body 3 is 8 mm.

In a specific embodiment, the cylinder body 3 is made of ceramic material.

In a specific embodiment, the base 1 is made of thermally conductive material.

In a specific embodiment, the base 1 is made of one or more materials selected from red copper, brass, aluminum, aluminum oxide and silicon carbide.

In a specific embodiment, the equivalent thermal conductivity of the low-temperature cigarette is 0.05-0.092 W/m·Kelvin, the equivalent specific heat capacity of the low-temperature cigarette is 0.3322-0.617 J/cm3·Kelvin, and the equivalent bulk density of the low-temperature cigarette is For 350 ~ 650 kg / cubic meter. Preferably, the equivalent thermal conductivity of the low-temperature cigarette is 0.071 W/m·Kelvin, the equivalent specific heat capacity of the low-temperature cigarette is 0.4746 J/cm3·Kelvin, and the equivalent bulk density of the low-temperature cigarette is 500 kg/m3.

In a specific embodiment, the diameter of the low temperature cigarette is 5.5-10.3 mm. Preferably, the diameter of the low temperature cigarette is 7.9 mm.

The utility model provides heating devices of three different embodiments, combined with another group of heating needles (rods), to form four groups of different heating devices for comparison. Among them, the diameter of the heating needle (rod) is 2 mm. The combinations of the outer diameter and sidewall thickness of the heating portion 2 of the other three groups of annular heating devices are respectively: (4 mm, 0.27 mm), (6 mm, 0.17 mm), (8 mm, 0.13 mm).

Using the commercial software FLUENT, the unsteady heat transfer calculation of these four heating structures was carried out by numerical simulation, and the curves of the maximum temperature, average temperature and temperature uniformity coefficient of low-temperature cigarettes under different heating structure parameters with time were obtained. As shown in Figures 3-6. specific,

Figure 3 shows the change curve of the maximum temperature of low-temperature cigarettes with time after heating is started. As can be seen from Figure 3, the maximum temperature of the low-temperature cigarette corresponding to the heating needle (rod) rises rapidly, but the cost is that the temperature uniformity of the cross-section of the low-temperature cigarette drops sharply. When the temperature is high, the internal temperature has already exceeded 350 °C, and when the temperature of the tobacco in the low-temperature cigarette is too high, excessive harmful substances, such as tar and phenol, will be produced due to violent pyrolysis. The annular heating device can make the temperature of the low-temperature cigarette rise slightly slower, and the temperature of the low-temperature cigarette will never exceed the critical temperature of 350°C during the smoking process.

Figure 4 is a curve showing the average temperature of low-temperature cigarettes as a function of time after heating is started. It can be seen from Figure 4 that when the annular heating device is used, the average temperature of the low-temperature cigarette is higher than that of the heating needle (rod). This also shows that the heating efficiency of the annular heating device is higher, the total number of smoking cigarettes after each fuel change can be increased, and the battery life (the time between two adjacent fuel changes) can be greatly extended.

Figure 5 is a curve of the temperature uniformity coefficient of the cross section of a low temperature cigarette at a length of 4 mm as a function of time. The closer the temperature uniformity coefficient is to 1, the more uniform the temperature field is. It can be clearly seen from FIG. 5 that when the annular heating device is used, the temperature uniformity of the low-temperature cigarette is much better than that of the needle (rod)-shaped heating structure. And it can be seen that when the outer diameter of the heating part 2 is 4-6 mm, the temperature uniformity of the low temperature cigarette is the best.

Further, the outer diameter of the heating part 2 is preferably in the range of 4 to 6 mm. Five groups of parameters with outer diameters of 4 mm, 4.5 mm, 5 mm, 5.5 mm and 6 mm were selected for comparison. Among them, the total volume of the heating part 2 was kept unchanged by changing the thickness of the side wall of the heating part 2 . Fig. 6 shows the variation curve of the temperature uniformity coefficient with time for the above five working conditions. It can be seen that when the outer diameter of the heating part 2 is 5.5 mm and the thickness of the side wall of the heating part 2 is 0.19 mm, the temperature distribution in the low temperature cigarette is the most uniform.

Although the disclosed embodiments of the present invention are as above, the content described is only an embodiment adopted to facilitate the understanding of the present invention, and is not intended to limit the present invention. Any person skilled in the technical field to which the present utility model belongs, without departing from the spirit and scope disclosed by the present utility model, can make any modifications and changes in the form and details of the implementation, but the patent of the present utility model The scope of protection is still subject to the scope defined by the appended claims.

Claims (20)

1. A heating device for low-temperature cigarettes, characterized in that, comprising a base, a heating portion and a cylinder with openings at both ends; wherein, the base is used for supporting the low temperature cigarette, separating the flame from the low temperature cigarette, and transferring the heat from the flame to the heating part; The inside of the heating part is provided with a cavity for accommodating tobacco, the bottom end of the heating part is connected with the base, and the heating part is used to be inserted inside the low-temperature cigarette to heat the low-temperature cigarette; The cylindrical body is sleeved on the outside of the heating part at intervals, an interlayer for fixing the low-temperature cigarette is formed between the inner wall of the cylindrical body and the outer wall of the heating part, and the bottom end of the cylindrical body is connected to the outer wall of the heating part. the base connection. 2 . The heating device according to claim 1 , wherein the cavity penetrates through the top end and the bottom end of the heating part. 3 . 3 . The heating device according to claim 2 , wherein a slit portion is opened on the bottom side wall of the heating portion. 4 . 4 . The heating device according to claim 3 , wherein the number of the slit portions is plural, and the plural slit portions are arranged at intervals. 5 . 5 . The heating device according to claim 4 , wherein the number of the slits is 4 to 8. 6 . 6 . The heating device according to claim 3 , wherein the width of the slit portion is 0.5-2 mm, and the length of the slit portion is 2-8 mm. 7 . 7 . The heating device according to claim 2 , wherein the cross-section of the heating portion is configured as a circular ring, a petal-shaped ring or a polygonal ring. 8 . 8 . The heating device according to claim 2 , wherein the outer diameter of the heating portion is 1/2 to 3/4 of the inner diameter of the cylinder. 9 . 9 . The heating device according to claim 2 , wherein the outer diameter of the heating portion is 4-6 mm. 10 . 10 . The heating device according to claim 2 , wherein the thickness of the side wall of the heating portion is 0.1-1 mm. 11 . 11 . The heating device according to claim 10 , wherein the thickness of the top side wall of the heating part is smaller than the thickness of the bottom side wall of the heating part. 12 . 12 . The heating device according to claim 1 , wherein a tip is provided on the top of the heating part. 13 . 13 . The heating device according to claim 1 , wherein the length of the heating portion is 1/2 to 4/5 of the length of the cylindrical body. 14 . 14 . The heating device according to claim 1 , wherein the length of the heating part is 9-15 mm. 15 . 15. The heating device according to claim 1, wherein the heating part is made of red copper, brass, aluminum, alumina or silicon carbide. 16 . The heating device according to claim 1 , wherein the thermal conductivity of the heating part is 271-504 W/m·Kelvin, and the specific heat capacity of the heating part is 2.436-4.524 J/cm·Kelvin, 16 . And the density of the heating part is 6285-11671 kg/m3. 17. The heating device according to claim 1, wherein the base is made of a thermally conductive material. 18. The heating device according to claim 17, wherein the base is made of red copper, brass, aluminum, aluminum oxide or silicon carbide. 19. The heating device according to claim 1, wherein the cylinder is made of ceramic material. 20. The heating device according to claim 1, wherein the equivalent thermal conductivity of the low-temperature cigarette is 0.05-0.092 W/m·Kelvin, and the equivalent specific heat capacity of the low-temperature cigarette is 0.3322-0.617 J/cubic cm·Kelvin, and the equivalent bulk density of the low-temperature cigarette is 350-650 kg/m3.

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