Double-section infrared heating body and double-section heating infrared heating smoking set

Abstract

The invention discloses a double-section infrared heating body and a double-section heating infrared heating smoking set, and relates to the technical field of smoking sets. According to the double-section infrared heating body, the double-section heating design is adopted, after the smoking set is started, the upper carbon fiber heating layer is started firstly to heat the upper-section cigarette, at the moment, a small amount of water vapor is brought in, the cigarette is closest to a cigarette holder, a large amount of smoke is heated, the main component is smoke, and the problem that the temperature of the smoke is too high due to rapid vaporization of water in the cigarette is not prone to occurring; after the upper-section cigarette is heated to be of a porous structure, the upper carbon fiber heating layer is shut down, the lower carbon fiber heating layer is started, the lower-section cigarette is heated through infrared radiation and heat conduction, and it is ensured that smoke is fully and evenly released; the cigarette heating uniformity is improved, the problem that the bad experience that the mouth of a user is scalded due to the fact that the smoke temperature is too high in the initial smoking stage is solved, and the smoking comfort level is improved.

Description

Technical Field

[0001] This invention relates to the field of smoking accessories technology, and in particular to a dual-segment infrared heating element and a dual-segment infrared heating smoking accessory. Background Technology

[0002] Heated tobacco products (HTPs) are revolutionary in the tobacco industry, characterized by no open flame, no ash, no secondhand smoke, and a 90% reduction in harm, while retaining 90% of the taste of traditional cigarettes. Currently, the mainstream heating methods for HTPs include center heating and circumferential heating. Infrared heating, due to its dual heat transfer characteristics of infrared radiation and thermal conduction, can theoretically achieve better heating uniformity by simultaneously heating the outer periphery and center of the cigarette when applied to smoking devices. However, in practice, it has been found that when infrared heating is directly applied to smoking devices, the strong heat release can lead to excessively high smoke temperatures during the initial inhalation stage (the first three puffs), causing the smoke to burn the user's mouth and affecting their smoking comfort. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a dual-stage infrared heating element and a dual-stage infrared heating smoking device. This smoking device can improve the uniformity of cigarette heating and solve the problem of excessively high cigarette temperature in the initial stage of smoking, which causes users to have an unpleasant experience of burning their mouths, thereby improving smoking comfort.

[0004] The first aspect of the present invention provides a dual-segment infrared heating element, including a heating tube, an upper carbon fiber heating layer and a lower carbon fiber heating layer that can generate infrared radiation are provided on the outer side of the heating tube, a first temperature sensing element is provided at the middle position of the outer surface of the upper carbon fiber heating layer, and a second temperature sensing element is provided at the middle position of the outer surface of the lower carbon fiber heating layer.

[0005] A second aspect of the present invention provides a dual-stage infrared heating smoking device, comprising a smoking device shell and a dual-stage infrared heating element disposed inside the smoking device shell. The dual-stage infrared heating element includes a heating tube, and an upper carbon fiber heating layer and a lower carbon fiber heating layer capable of generating infrared radiation are provided on the outer side of the heating tube. A first temperature sensing element is provided at the middle position of the outer surface of the upper carbon fiber heating layer, and a second temperature sensing element is provided at the middle position of the outer surface of the lower carbon fiber heating layer.

[0006] The beneficial technical effects of this invention are as follows: The aforementioned dual-stage infrared heating element and dual-stage infrared heating smoking device employ a dual-stage heating design. After the smoking device is activated, the upper carbon fiber heating layer is activated first to heat the upper section of the cigarette. At this time, less water vapor is introduced, and the cigarette is closest to the mouthpiece. After a large amount of smoke is heated, the main component is smoke, which reduces the risk of excessively high smoke temperature due to rapid vaporization of moisture inside the cigarette. Once the upper section of the cigarette is heated into a porous structure, the upper carbon fiber heating layer is turned off, and the lower carbon fiber heating layer is activated. The lower section of the cigarette is heated through infrared radiation and heat conduction, ensuring sufficient and uniform smoke release. This invention not only improves the uniformity of cigarette heating but also solves the problem of excessively high smoke temperature causing a burning sensation in the mouth for users during the initial stage of smoking, thus enhancing smoking comfort. Attached Figure Description

[0007] Figure 1 This is an overall cross-sectional view of the dual-stage heating infrared smoke generator according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the dual-segment infrared heating element in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the dual-segment infrared heating element in Embodiment 1 of the present invention; Figure 4 This is a temperature data curve of the dual-segment infrared heating element in Embodiment 1 of the present invention during a comparative experiment; Figure 5 This is a graph showing the temperature data of the dual-segment resistance wire heater during the comparative experiment. Figure 6 This is an overall cross-sectional view of the dual-stage heating infrared smoke set in Embodiment 2 of the present invention; Figure 7 This is a cross-sectional view of the dual-segment infrared heating element in Embodiment 2 of the present invention; Figure 8 This is an overall cross-sectional view of the dual-stage heating infrared smoke appliance in Embodiment 3 of the present invention; Figure 9 This is a temperature data curve of the dual-segment infrared heating element in Embodiment 3 of the present invention during a comparative experiment; Figure 10 This is an overall cross-sectional view of the dual-stage heating infrared smoke set in Embodiment 4 of the present invention; Figure 11 This is a temperature data curve of the dual-segment infrared heating element in Embodiment 4 of the present invention during a comparative experiment.

[0008] Explanation of reference numerals in the attached figures: 10-Smoking device shell, 11-Mouthpiece, 12-Air inlet, 20-Dual-segment infrared heating element, 21-Heating tube, 22-Upper carbon fiber heating layer, 23-Lower carbon fiber heating layer, 24-First temperature sensor, 25-Second temperature sensor, 26-Upper electrode, 27-Middle electrode, 28-Lower electrode, 29-Spiral air duct component, 30-Conical heating module support component, 40-Independent air duct, 50-PCB, 60-Battery, 70-Multi-hole air inlet, 80-Heat insulation layer, 90-Cleaning cotton, 91-Ventilation hole, 93-Removable cleaning cotton support component. Detailed Implementation

[0009] To enable those skilled in the art to more clearly understand the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] Example 1: like Figure 1 As shown, in this embodiment of the invention, the dual-stage infrared heating smoke hood includes a smoke hood shell 10 and a dual-stage infrared heating element 20, a conical heating module support 30, an independent air duct 40, a PCB 50, and a battery 60 disposed inside the smoke hood shell 10.

[0011] like Figure 2 , Figure 3 As shown, the dual-segment infrared heating element 20 includes a heating tube 21, with an upper carbon fiber heating layer 22 and a lower carbon fiber heating layer 23 on the outer side of the heating tube 21. The heating tube 21 is made of materials with high infrared transmittance and good thermal conductivity, such as ceramic, sapphire, or glass. The ceramic can be aluminum nitride ceramic or alumina ceramic, and the glass can be quartz glass. The outer wall of the heating tube 21 supports the upper carbon fiber heating layer 22 and the lower carbon fiber heating layer 23, and the interior of the heating tube 21 provides a clean heating chamber for the cigarette, allowing consumers to smoke with confidence. Both the upper carbon fiber heating layer 22 and the lower carbon fiber heating layer 23 are composed of carbon fiber heating wires, which are tightly arranged on the outside of the heating tube 21 through weaving, winding, or other methods. The upper carbon fiber heating layer 22 and the lower carbon fiber heating layer 23 can be independently controlled in terms of power and time via the PCB 50. During the heating process, they not only generate heat themselves but also produce infrared radiation, thus providing dual heating for the cigarette inside the heating tube 21, resulting in faster temperature rise.

[0012] See you again Figure 2In this embodiment, the heating tube 21 is provided with an upper electrode 26, a middle electrode 27, and a lower electrode 28 arranged from top to bottom on its outer side. The two ends of the upper carbon fiber heating layer 22 are connected to the upper electrode 26 and the middle electrode 27 respectively, and are connected to the PCB 50 through corresponding electrode pins. The two ends of the lower carbon fiber heating layer 23 are connected to the middle electrode 27 and the lower electrode 28 respectively, and are connected to the PCB 50 through corresponding electrode pins. The upper electrode 26, the middle electrode 27, and the lower electrode 28 can be conductive structures made of one or more of the following materials: gold, silver, copper, nickel, and aluminum. They can also be conductive structures with a gold coating, silver coating, copper coating, nickel coating, or aluminum coating on their surface.

[0013] See you again Figure 2 A first temperature sensing element 24 is provided at the middle position of the outer surface of the upper carbon fiber heating layer 22, and a second temperature sensing element 25 is provided at the middle position of the outer surface of the lower carbon fiber heating layer 23. In this embodiment, the first temperature sensing element 24 and the second temperature sensing element 25 are PT100 platinum resistance thermometers, used to collect the temperatures of the upper carbon fiber heating layer 22 and the lower carbon fiber heating layer 23 respectively, so as to achieve precise temperature control. In some preferred embodiments, the first temperature sensing element 24 and the second temperature sensing element 25 can be thin-film thermocouples (such as PtRh 30 / PtRh 6 thermocouples). Before assembly, two thin-film thermocouples are arranged on the outer wall of the heating tube 21, and the positions of the two thin-film thermocouples correspond to the middle positions of the upper carbon fiber heating layer 22 and the lower carbon fiber heating layer 23 respectively. After insulation treatment (alumina coating), the upper carbon fiber heating layer 22 and the lower carbon fiber heating layer 23 are then assembled onto the heating tube 21. This method can save the layout space of the thermocouples. Because thin-film thermocouples are very thin and small, they occupy very little space in the heating element, and the dual-segment infrared heating element 20 has a higher space utilization rate.

[0014] See you again Figure 1 The dual-segment infrared heating element 20 is provided with a heat insulation layer 80 on its outer side. The heat insulation layer 80 can be made of materials with heat insulation effect such as aerogel, heat insulation cotton, and mica sheets. The heat insulation layer 80 has a triple function: first, it provides heat insulation; second, it can support and fix the temperature sensing element of the dual-segment infrared heating element 20; and third, it provides insulation protection, isolating the electrical connection between the carbon fiber heating layer and the internal metal components of the smoking device.

[0015] See you again Figure 1The upper end of the heating tube 21 is connected to the mouthpiece 11 of the smoking device housing 10, and the lower end of the heating tube 21 is connected to the upper end of the conical heating module support 30. The independent air duct 40 is connected between the lower end of the conical heating module support 30 and the air inlet 12 of the smoking device housing 10. The conical heating module support 30 has a dual function: firstly, it supports the dual-segment infrared heating element 20; secondly, it collects dirt, which, under gravity, flows downwards along the conical surface during the smoking device's operation. The independent air duct 40 connects the dual-segment infrared heating element 20 with the outside air, allowing outside air to enter the core component (dual-segment infrared heating element 20) through an independent environment, ensuring cleanliness.

[0016] See you again Figure 1 The PCB 50 is electrically connected to the dual-segment infrared heating element 20 and the battery 60, respectively, and is used to control the charging of the battery 60 and to control the power and time of the dual-segment infrared heating element 20; the battery 60 is electrically connected to the PCB 50 and is used to supply power to the entire dual-segment infrared heating smoke appliance.

[0017] The dual-segment infrared heating element 20 of this invention adopts a dual-segment heating design. After the smoking device is started, the upper carbon fiber heating layer 22 is activated first to heat the upper section of the cigarette (the heating time and power of the upper carbon fiber heating layer 22 are controlled by the PCB, first heating at full power for a period of time (e.g., 15 seconds); then heating continues for another period of time in the manner of smoking once and stopping for 10 seconds (e.g., the period from 15 seconds to 60 seconds)). At this time, less water vapor is introduced and the cigarette is closest to the mouthpiece. After a large amount of smoke is heated, the main component is smoke, and it is not easy to cause the problem of excessively high smoke temperature due to rapid vaporization of moisture in the cigarette. After the upper section of the cigarette is heated into a porous structure, the upper carbon fiber heating layer 22 is turned off and the lower carbon fiber heating layer 23 is activated. The lower section of the cigarette is heated twice through infrared radiation and heat conduction to ensure that the smoke is released fully and evenly. Since the smoke of the upper section of the cigarette has been released into a porous structure, it can have a certain gathering effect on the smoke of the lower section of the cigarette, which can satisfy the smoking experience of a large amount of smoke when smoking.

[0018] To verify the superiority of the embodiments of the present invention, the dual-segment infrared heating element 20 and the dual-segment resistance wire heating element of this embodiment were respectively installed in a smoking device for comparative experiments: 1. After the dual-segment infrared heating element 20 is installed, the upper carbon fiber heating layer 22 is activated first to heat the upper section of the cigarette. Full power output is used for the first 15 seconds. Then, the smoke from the first three puffs is collected and weighed using a 1-puff-10-second pause pattern. The smoke temperature at the mouthpiece 11 and the mouthpiece 11 outlet is measured during each puff. The experimental data is recorded in Table 1. After 60 seconds, the upper carbon fiber heating layer 22 is turned off, and the lower carbon fiber heating layer 23 is activated. The lower section of the cigarette is heated for the period from 60 seconds to 270 seconds using a 1-puff-10-second pause pattern. The temperature data curve is recorded in Table 1. Figure 4 The experimental data are recorded in Table 1.

[0019] 2. After the dual-segment resistance wire heating element is installed, the upper resistance wire is first activated to heat the upper section of the cigarette. Full power output is used for the first 15 seconds. Then, the smoke from the first three puffs is collected and weighed, and the smoke temperature at the mouthpiece 11 and mouthpiece 11 outlet is measured for each puff. The experimental data is recorded in Table 1. After 60 seconds, the upper carbon fiber heating layer 22 is turned off, and the lower carbon fiber heating layer 23 is activated. The lower section of the cigarette is heated for the period from 60 seconds to 270 seconds using the 10-second pause / puff method. The temperature data curve is recorded in Table 1. Figure 5 The experimental data are recorded in Table 1.

[0020] Table 1: Depend on Figure 4 , Figure 5 As shown in Table 1: 1) When the amount of smoke in the first three puffs reaches the same level of smoking satisfaction, the dual-segment infrared heating element 20 has a lower peak temperature (320°C) due to the simultaneous effect of infrared radiation and heat transfer, while the dual-segment resistance wire heating element requires a higher peak temperature (350°C) to achieve sufficient smoke volume. At this time, the smoke temperature of the dual-segment infrared heating element 20 is 40°C and the mouthpiece temperature is 38°C, while the smoke temperature of the dual-segment resistance wire heating element is 61°C and the mouthpiece temperature is 56°C. Therefore, the smoke temperature and mouthpiece temperature of the dual-segment infrared heating element 20 are lower.

[0021] 2) Judging from the temperature data curves, the carbon fiber dual-segment infrared heating element 20 heats up quickly and cools down slowly; the resistance wire dual-segment resistance wire heating element heats up relatively slowly, but cools down relatively quickly.

[0022] 3) The dual-segment infrared heating element 20 exhibits superior performance in terms of thermal response speed, temperature uniformity, and vaping comfort. Its faster heating characteristics and good heat conduction matching allow for more complete vapor release, while avoiding the burning sensation caused by localized overheating, thus improving the overall vaping experience. Although the dual-segment resistance wire heating element has a certain heating capacity, it still has shortcomings in terms of temperature control precision and heat distribution rationality.

[0023] In summary, the dual-segment infrared heating element 20 of this invention adopts a dual-segment heating design. After the smoking device is started, the upper carbon fiber heating layer 22 is activated first to heat the upper section of the cigarette. At this time, less water vapor is introduced and the cigarette is closest to the mouthpiece. After a large amount of smoke is heated, the main component is smoke, which is less likely to cause the smoke temperature to be too high due to the rapid vaporization of moisture in the cigarette. After the upper section of the cigarette is heated into a porous structure, the upper carbon fiber heating layer 22 is turned off and the lower carbon fiber heating layer 23 is activated to heat the lower section of the cigarette through infrared radiation and heat conduction, ensuring that the smoke is released fully and evenly. This invention not only improves the uniformity of cigarette heating, but also solves the problem of excessively high smoke temperature in the initial stage of smoking, which causes the user to have a burning mouth and improves smoking comfort.

[0024] Example 2: Figure 6 An overall cross-sectional view of the dual-stage heating infrared smoke device of Embodiment 2 of the present invention is shown. Figure 7 A cross-sectional view of the dual-segment infrared heater in Embodiment 2 of the present invention is shown.

[0025] like Figure 6 and Figure 7 As shown, the difference between the dual-stage heating infrared smoke appliance in this embodiment and the dual-stage heating infrared smoke appliance in Embodiment 1 is that a spiral air passage 29 is installed at the lower end of the heating tube 21.

[0026] The spiral air duct component 29 is made of alumina ceramic, aluminum nitride ceramic, or different metal materials. The spiral air duct component 29 has four functions: first, it supports the cigarette; second, it transfers the heat generated by the lower carbon fiber heating layer 23 to the cigarette through heat transfer; third, its spiral structure design allows air to come into contact with more spiral surfaces when flowing in the spiral air duct component 29, so that the heat generated by the lower carbon fiber heating layer 23 can heat the air entering the cigarette to a greater extent; and fourth, it has a spiral upward traction effect on the gas.

[0027] See you again Figure 6 The lower end opening of the heating tube 21 is also provided with a multi-hole air inlet 70, which allows air in the independent air passage 40 to enter the spiral air passage component 29 evenly.

[0028] The dual-segment infrared heating element 20 of this invention adopts a dual-segment heating design, wherein the upper carbon fiber heating layer 22 directly heats the upper section of the cigarette, and the lower carbon fiber heating layer 23 heats the spiral air passage component 29 and then indirectly heats the lower section of the cigarette. After the smoking device is started, the upper carbon fiber heating layer 22 is activated first to heat the upper section of the cigarette. At this time, less water vapor is introduced and the cigarette is closest to the mouthpiece. After a large amount of smoke is heated, the main component is smoke, and the problem of excessively high smoke temperature caused by rapid vaporization of moisture in the cigarette is not likely to occur. After the upper section of the cigarette is heated into a porous structure, the upper carbon fiber heating layer 22 is turned off and the lower carbon fiber heating layer 23 is activated for the second stage of heating. During the second stage of heating, cold air is brought into the independent air passage 40 and preheated by the spiral air passage component 29 at the top. Part of the heat of the preheated air is transferred to the lower section of the cigarette to heat the air in the cigarette. At the same time, the lower section of the cigarette also receives infrared radiation and heat transfer from the heating tube 21. After the lower section of the cigarette is triple heated, the smoke is released fully and evenly. Since the smoke in the upper section of the cigarette has been released into a porous structure, it can have a certain gathering effect on the smoke in the lower section of the cigarette, which can satisfy the smoking experience of a large amount of smoke when inhaling.

[0029] The dual-segment infrared heating element 20 of this invention has a spiral air passage 29 installed at the lower end of the heating tube 21 to spirally guide and preheat the cold air entering the smoking device. Combined with the dual heating of infrared radiation and heat conduction, it achieves three-dimensional uniform heating of the cigarette from top to bottom and from outside to inside, avoiding local overheating or underheating, and ensuring excellent heating uniformity, thus ensuring the full and consistent release of tobacco components.

[0030] Example 3: Figure 8 An overall cross-sectional view of the dual-stage heating infrared smoke generator according to Embodiment 3 of the present invention is shown.

[0031] like Figure 8 As shown, the difference between the dual-stage heating infrared smoke hood in this embodiment and the dual-stage heating infrared smoke hood in Embodiment 2 is that the independent air duct 40 is provided with a cleaning cotton 90.

[0032] See you again Figure 8 The cleaning cotton 90 adopts a uniform porous structure made of materials such as cotton, linen, or chemical fibers. The cleaning cotton 90 has a central vent 91 extending through both ends. The cleaning cotton 90 is located at the end of the independent air duct 40 near the dual-segment infrared heater 20. The cleaning cotton 90 is used to collect residues generated during the operation of the smoking device and to trap gas for heat preservation.

[0033] See you again Figure 8 The independent air passage 40 is provided with a detachable cleaning cotton support 93 to support the cleaning cotton 90, and the cleaning cotton 90 can be replaced periodically through the detachable design.

[0034] The dual-segment infrared heating element 20 of this invention adopts a dual-segment heating design, wherein the upper carbon fiber heating layer 22 directly heats the upper section of the cigarette, and the lower carbon fiber heating layer 23 heats the spiral air passage component 29 and then indirectly heats the lower section of the cigarette. After the smoking device is started, the upper carbon fiber heating layer 22 is activated first to heat the upper section of the cigarette. At this time, less water vapor is introduced and the cigarette is closest to the mouthpiece. After a large amount of smoke is heated, the main component is smoke, and the problem of excessively high smoke temperature caused by rapid vaporization of moisture in the cigarette is not likely to occur. After the upper section of the cigarette is heated into a porous structure, the upper carbon fiber heating layer 22 is turned off and the lower carbon fiber heating layer 23 is activated for the second stage of heating. During the second stage of heating, cold air is brought into the independent air passage 40. After the cold air enters the upper part of the cleaning cotton 90, it is locked and preheated by the spiral air passage component 29. Part of the heat of the preheated air is transferred to the lower section of the cigarette to heat the air in the cigarette. At the same time, the lower section of the cigarette also receives infrared heating and heat transfer from the heating tube 21. After the lower section of the cigarette is triple heated, the smoke is released fully and evenly. Since the smoke in the upper section of the cigarette has been released into a porous structure, it can have a certain gathering effect on the smoke in the lower section of the cigarette, which can satisfy the smoking experience of a large amount of smoke when inhaling.

[0035] To verify the superiority of the embodiments of the present invention, a comparative experiment was conducted between the dual-stage infrared heating smoking device of this embodiment and the dual-stage infrared heating smoking device of Embodiment 1: Assuming the loss of cigarettes in the first three puffs was consistent, the temperature data curve of the dual-stage infrared heating element in this embodiment was obtained as follows: Figure 9 As shown; the temperature data curve of the dual-segment infrared heater in Example 1 is as follows. Figure 4 As shown.

[0036] Depend on Figure 9 , Figure 4 It can be seen that, under the premise of ensuring consistent operating conditions, the addition of the spiral air duct component 29 and the cleaning cotton 90 allows the dual-stage infrared heating element 20 to achieve comparable results at a lower electronically controlled temperature (280°C). Simultaneously, a comparison of smoking performance was conducted. With the same battery capacity (1500mAh), the dual-stage infrared heating device in Example 1 could support the smoking of 15 cigarettes, while the dual-stage infrared heating device in this example could support the smoking of 18 cigarettes. This further demonstrates that the dual-stage infrared heating device in this example can reduce energy consumption while ensuring sufficient smoke volume and preventing the first three puffs from burning the mouth.

[0037] In this embodiment of the invention, a dual-stage infrared heating smoking device has a spiral air duct component 29 installed at the lower end of the heating tube 21. A cleaning cotton 90 is provided at the end of the independent air duct 40 near the dual-stage infrared heating element 20. The cleaning cotton 90 not only absorbs condensed e-liquid stains during inhalation, keeping the air duct clean, but also traps air and forms an insulation layer with the spiral air duct component 29, reducing heat loss and improving thermal efficiency. Furthermore, the cleaning cotton support is detachable, allowing users to easily replace the contaminated cleaning cotton 90, maintaining air duct cleanliness and hygiene for a long time and preventing residue from affecting the taste.

[0038] Example 4: Figure 10 An overall cross-sectional view of the dual-stage heating infrared smoke appliance of Embodiment 4 of the present invention is shown.

[0039] like Figure 10 As shown, the difference between the dual-stage infrared heating smoke hood in this embodiment and the dual-stage infrared heating smoke hood in Embodiment 3 is that the cleaning cotton 90 is disposed at the end of the independent air duct 40 away from the dual-stage infrared heating body 20.

[0040] A comparative experiment was conducted between the dual-stage infrared heating smoking device of this embodiment and the dual-stage infrared heating smoking device of Embodiment 3: Assuming the cigarette loss in the first three puffs was consistent, the temperature data curve of the dual-stage infrared heating smoking device of this embodiment was obtained as follows: Figure 11 As shown; the temperature data curve of the dual-stage heating infrared smoke generator in Example 3 is as follows. Figure 9 As shown.

[0041] Depend on Figure 9 , Figure 11 It can be known that: 1) Under the premise of ensuring consistent operating conditions, a comparative experiment was conducted by adjusting the assembly position of the cleaning cotton 90. Temperature comparison revealed that when the cleaning cotton 90 was assembled closer to the heating element, the highest temperature of the upper section of the heating element during the preheating stage (first 15 seconds) reached 280℃. Conversely, when the cleaning cotton 90 was assembled closer to the air inlet 12, the highest temperature of the upper section of the heating element during the preheating stage only reached 269℃. This demonstrates that assembling the cleaning cotton 90 closer to the heating element provides better heat preservation.

[0042] 2) Under the premise of ensuring consistent operating conditions, a comparative experiment was conducted by adjusting the assembly position of the cleaning cotton 90. Through suction comparison, with the same battery capacity (1500mAh), the dual-stage heating infrared smoking device in Example 3 could support the smoking of 18 cigarettes, while the dual-stage heating infrared smoking device in this embodiment could only support the smoking of 16 cigarettes. This further proves that a better heat preservation effect can be achieved when the cleaning cotton 90 is assembled closer to the heating element.

[0043] 3) During the comparative test, it was found that when the cleaning cotton 90 was installed near the air inlet 12, dirt residue appeared on the inner wall of the independent air passage 40, while the cleaning cotton 90 had relatively less dirt. This indicates that the cleaning cotton 90's cleaning effect is not good when installed near the air inlet 12. Over time, when smoking new cigarettes, the residue on the inner wall of the independent air passage 40 may emit an odor, thus indirectly affecting the taste.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent variations or modifications made within the scope of the claims should fall within the protection scope of the present invention.

Claims

1. A dual-segment infrared heating element, characterized in that: The dual-segment infrared heating element includes a heating tube. The heating tube has an upper carbon fiber heating layer and a lower carbon fiber heating layer on its outer side, which can generate infrared radiation. A first temperature sensing element is provided at the middle position of the outer surface of the upper carbon fiber heating layer, and a second temperature sensing element is provided at the middle position of the outer surface of the lower carbon fiber heating layer.

2. The dual-segment infrared heating element as described in claim 1, characterized in that: A spiral air passage is installed at the lower end of the heating tube.

3. The dual-segment infrared heating element as described in claim 2, characterized in that: The spiral air passage component is made of alumina ceramic, aluminum nitride ceramic, or metal material.

4. The dual-segment infrared heating element as described in claim 1, characterized in that: The first temperature sensing element is a thin-film thermocouple or a PT100 platinum resistance thermometer; the second temperature sensing element is a thin-film thermocouple or a PT100 platinum resistance thermometer.

5. The dual-segment infrared heating element as described in claim 1, characterized in that: The heating tube has an upper electrode, a middle electrode, and a lower electrode arranged from top to bottom on its outer side. The two ends of the upper carbon fiber heating layer are connected to the upper electrode and the middle electrode, and the two ends of the lower carbon fiber heating layer are connected to the middle electrode and the lower electrode.

6. The dual-segment infrared heating element according to any one of claims 1-5, characterized in that: The heating element is made of ceramic, sapphire, or glass.

7. A dual-stage heating infrared smoking device, characterized in that: It includes a smoking appliance housing and a dual-segment infrared heating element as described in any one of claims 1-6 disposed inside the smoking appliance housing.

8. The infrared heating smoke set with dual-stage heating as described in claim 7, characterized in that: The dual-stage infrared heating smoking device also includes a conical heating module support and an independent air duct. The upper end of the heating tube of the dual-stage infrared heating element is connected to the mouthpiece of the smoking device shell, the lower end of the heating tube is connected to the upper end of the conical heating module support, and the independent air duct is connected between the lower end of the conical heating module support and the air inlet of the smoking device shell.

9. The infrared heating smoke set with dual-stage heating as described in claim 8, characterized in that: The independent airway is equipped with a cleaning cotton, and the cleaning cotton has a vent hole in the center that connects both ends.

10. The infrared heating smoke set with dual-stage heating as described in claim 9, characterized in that: The cleaning cotton is located at one end of the independent airway near the dual-segment infrared heater, or at the other end of the independent airway away from the dual-segment infrared heater.

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