Air heating structure and cigarette set

Abstract

The present invention relates to the technical field of air heating, and discloses an air heating structure and a cigarette set. The air heating structure comprises at least two tubular structures, the tubular structures being arranged in the same direction to form a heat exchange tube bundle, air circulating inside the tubular structures, the tubular structures being used for generating heat after being powered on, and each tubular structure comprising a spiral tube member, a non-twisted flat tube, a spiral flat tube, or a porous tube structure. The air heating structure provided by the present invention has a simple structure, is easy to process, and can also effectively heat air.

Description

Air heating structure and smoking set

[0001] This application claims priority to Chinese Patent Application No. CN202410434502.9, filed on April 10, 2024, the contents of which are incorporated herein in their entirety by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of air heating, more particularly, to an air heating structure. In addition, it also relates to a smoking set comprising the air heating structure. BACKGROUND

[0003] In the field of heat-not-burn, air heating is a new heating method, which specifically heats the air in the airflow heating element at the bottom of the smoking body, and then uses the convection of hot air to conduct the hot air from bottom to top to heat the cigarette. Compared with the ordinary heat conduction heating method, it has better heating uniformity and penetration. In order to make the air fully heated, at present, most air heating type smoking sets set different structures for the bottom heat source, thereby forming various air flow channels to make the air fully heated to heat the cigarette.

[0004] The prior art proposes a heating structure, which sets multiple protrusions on the bottom heat conduction part, and forms air channels between the multiple protrusions. The air channels make the air have enough space and time to exchange heat with the heat conduction part when flowing through the heat conduction part, so as to ensure that the air entering the cigarette has a high enough temperature. The above-mentioned similar scheme indeed achieves the purpose of increasing the air channel, but it has the problems of complex structure, complicated preparation process, high cost, etc.

[0005] In view of the above, how to provide a heating structure with simple structure, easy to process and effective air heating is a problem that the technical personnel in the field are eager to solve at present. SUMMARY

[0006] Therefore, the purpose of the present application is to provide an air heating structure with simple structure, easy to process and effective air heating.

[0007] Another purpose of the present application is to provide a smoking set comprising the air heating structure.

[0008] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] An air heating structure comprises at least two tubular structures, each of the tubular structures is arranged in the same direction to form a heat exchange tube bundle, the inside of the tubular structure flows through air, the tubular structure is used to realize heat generation after the power is turned on, and the tubular structure comprises a spiral pipe, a flat tube without torsion, a spiral flat tube, or a porous pipe structure.

[0010] In one embodiment, the tubular structure comprises a piece of material with high thermal conductivity and high electrical conductivity.

[0011] In one embodiment, the tubular structure comprises an inner tube and an outer tube, the inner tube is a piece of material with high electrical conductivity, and the outer tube is a piece of material with high thermal conductivity and high heat capacity.

[0012] In one embodiment, the piece of material with high electrical conductivity comprises an electric heating fiber, an electric heating wire, an electric heating ribbon, an electric heating film, an electric heating sheet, an electric heating tube, or an electric heating plate.

[0013] In one embodiment, the piece of material with high heat capacity comprises a piece of ceramic material or a piece of metal material.

[0014] In one embodiment, the inner tube and the outer tube are an integral structure.

[0015] In one embodiment, when the tubular structure is a flat tube structure, the ratio of the minor axis length to the major axis length of the tubular structure is 0.4-0.8.

[0016] In one embodiment, when the tubular structure is a spiral structure, the ratio of the total length to the pitch of the tubular structure is 1-10.

[0017] A smoking set comprising the air heating structure as described in any one of the above.

[0018] In use of the air heating structure provided by the present application, air can flow through the inside of the tubular structure, and the tubular structure can generate heat after being powered on to heat the air so that the air has a high enough temperature when entering a cigarette. The tubular structure comprises a spiral tube, a flat tube without twisting, a spiral flat tube, or a porous tube structure (similar to a honeycomb ceramic structure, which is conducive to improving the heat transfer effect of the tubular structure).

[0019] That is, in actual use, according to actual conditions and actual needs, whether the tubular structure is twisted spirally or is a flat tube can be selected to make the heat transfer effect of the tubular structure better than that of a smooth tube. This is because the tubular structure has a curved spiral flow channel or a flattened flow channel inside, and when a user smokes, air flows upward along the tubular structure. Due to the action of the centrifugal force on the air moving in the tubular structure, the flow speed and direction of the air are periodically changed, thereby enhancing the radial mixing of the air, destroying the heat transfer boundary layer, and strengthening the heat transfer, so that the air and the tubular structure are fully heat exchanged. Moreover, the device has a simple structure, is easy to prepare, has a low cost, and can be widely used.

[0020] In summary, the air heating structure provided by the present application is simple in structure, easy to process, and can effectively heat air.

[0021] In addition, the present application also provides a smoking set comprising the air heating structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0023] Fig. 1 is a structural schematic diagram of the air heating structure provided by the present application;

[0024] Fig. 2 is a side view of the air heating structure;

[0025] Fig. 3 is a structural schematic diagram of the tubular structure;

[0026] Fig. 4 is a side view cross-sectional view of the tubular structure.

[0027] In Figs. 1-4: 1 is a tubular structure, 2 is a heat exchange tube bundle, A is the long axis length of the tubular structure, B is the short axis length of the tubular structure, L is the total length of the tubular structure, and S is the pitch of the tubular structure. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] The core of the present application is to provide an air heating structure which is simple in structure, easy to process, and can effectively heat air. Another core of the present application is to provide a smoking set comprising the air heating structure.

[0030] Please refer to Figs. 1-4, Fig. 1 is a structural schematic diagram of the air heating structure provided by the present application; Fig. 2 is a side view of the air heating structure; Fig. 3 is a structural schematic diagram of the tubular structure; and Fig. 4 is a side view cross-sectional view of the tubular structure.

[0031] The embodiment provides an air heating structure, which comprises at least two tubular structures 1, each of the tubular structures 1 is arranged in the same direction to form a heat exchange tube bundle 2, air flows in the tubular structure 1, the tubular structure 1 is used to generate heat after being connected to a power supply, and the tubular structure 1 comprises a spiral pipe, a flat pipe without twisting, a spiral flat pipe or a porous pipe structure.

[0032] It should be noted that the tubular structure 1 is used to generate heat after being connected to a power supply, if the tubular structure 1 only comprises a material piece with high thermal conductivity, an electrically conductive piece can be attached to the tubular structure 1, heat is transmitted to the tubular structure 1 through the electrically conductive piece after the electrically conductive piece is connected to the power supply, so that the tubular structure 1 generates heat; if the tubular structure 1 comprises a material piece with high electrical conductivity but general thermal conductivity, or the tubular structure 1 comprises a material piece with high thermal conductivity and a material piece with high electrical conductivity, the tubular structure 1 can generate heat after being connected to the power supply. In actual application, the shape, structure, size and material of the tubular structure 1 can be determined according to actual conditions and actual requirements.

[0033] In use, air can flow in the tubular structure 1, the tubular structure 1 can generate heat after being connected to a power supply (the process of generating heat by being connected to a power supply is as described above), so as to heat the air, so that the air has a high enough temperature when entering a cigarette. The tubular structure 1 comprises a spiral pipe, a flat pipe without twisting, a spiral flat pipe or a porous pipe structure (which is similar to a honeycomb ceramic structure and is beneficial to improving the heat transfer effect of the tubular structure 1).

[0034] That is, in actual application, whether the tubular structure 1 is spirally twisted, whether the tubular structure 1 is a flat pipe can be selected according to actual conditions and actual requirements, so that the heat transfer effect of the tubular structure 1 is better than that of a smooth pipe. Because the tubular structure 1 has a curved spiral flow channel or a flattened flow channel in the pipe, when a user smokes, gas flows upward along the tubular structure 1, the flow speed and direction of the air are periodically changed due to the action of centrifugal force when the air moves in the tubular structure 1, so that the radial mixing of the air is enhanced, the heat transfer boundary layer is destroyed, the heat transfer is strengthened, and the air and the tubular structure 1 are fully heat exchanged. Moreover, the device has the advantages of simple structure, convenient preparation and low cost, and can be widely used.

[0035] In conclusion, the air heating structure provided by the embodiment has the advantages of simple structure, easy processing and effective air heating.

[0036] In one embodiment, the tubular structure 1 comprises a material piece with high thermal conductivity and high electrical conductivity.

[0037] It should be noted that the tubular structure 1 includes a piece of material with high thermal conductivity and high electrical conductivity (for example, a piece of metal material such as copper, silver, aluminum, etc.), so that the tubular structure 1 can be heated spontaneously after being connected to a power source. Of course, the tubular structure 1 can also include only a piece of material with high thermal conductivity (for example, a piece of graphite material, a piece of carbon fiber material, a piece of diamond or silicon nitride material, etc.), or the tubular structure 1 includes a piece of material with high electrical conductivity but general thermal conductivity. Among them, when the tubular structure 1 includes only a piece of material with high thermal conductivity, an electrically conductive piece can be attached to the tubular structure 1, and the electrically conductive piece can transfer heat to the tubular structure 1 after being connected to a power source, so that the tubular structure 1 generates heat.

[0038] In actual application, the type of the piece of metal material can be determined according to actual conditions and actual needs.

[0039] In one embodiment, the tubular structure 1 includes an inner tube and an outer tube sleeved on the outer circumferential portion of the inner tube, the inner tube is a piece of electric heating material with high electrical conductivity, and the outer tube is a piece of heat storage material with high thermal conductivity and high heat capacity. That is, the tubular structure 1 can be made of a piece of electric heating material with good electrical conductivity and a piece of heat storage material with high thermal conductivity and high heat capacity. Therefore, the electric heating material can be heated spontaneously after being connected to a power source, and the heat storage material can store the heat generated by the electric heating material, reducing the heat dissipation of the electric heating material.

[0040] In one embodiment, the electric heating material includes electric heating fiber, electric heating wire, electric heating tape, electric heating film, electric heating sheet, electric heating tube, or electric heating plate. In actual application, the type of the electric heating material can be determined according to actual conditions and actual needs.

[0041] In one embodiment, the heat storage material includes a piece of ceramic material or a piece of metal material. For example, the heat storage material can be set as a piece of ceramic material such as aluminum oxide or zirconium oxide.

[0042] In one embodiment, the inner tube and the outer tube are one-piece structure, so as to simplify the assembly process of the device.

[0043] In one embodiment, when the tubular structure 1 is a flat tube structure, the ratio of the short axis length to the long axis length of the tubular structure 1 is 0.4-0.8.

[0044] It should be noted that the long axis length of the tubular structure 1 is A, the short axis length of the tubular structure 1 is B, and the ratio of the short axis length to the long axis length (i.e., the short-long axis ratio) B / A represents the flatness of the circular tube. The total length of the tubular structure 1 is L, and the pitch of the tubular structure 1 is S. L / S is the number of turns, which is used to represent the degree of twisting of the tubular structure 1. Different short-long axis ratios and degrees of twisting of different cross sections will result in different heat transfer enhancement effects. Under the same energy consumption, reducing the short-long axis ratio B / A and increasing the degree of twisting L / S are beneficial to improve the enhanced heat transfer performance in the tubular structure 1, so that the gas can be fully heat exchanged and heated, but the corresponding air flow resistance coefficient f will also increase, resulting in a decrease in the gas flow per unit time.

[0045] The smaller the short-long axis ratio B / A, i.e., the flatter the tubular structure 1, the smaller the cross-sectional area, and the greater the gas flow rate, which is more conducive to the mixing and heat exchange of different heat gases, and the greater the surface heat exchange coefficient h, so as to achieve enhanced heat exchange. However, the flatter the tubular structure 1, the greater the gas radial disturbance, and the greater the gas flow resistance coefficient f, resulting in a decrease in the gas flow per unit time.

[0046] Table 1: Changes in tubular structure heating with short-long axis ratio at the same number of turns

[0047] According to Table 1 above, when the number of turns is the same, the smaller the short-long axis ratio, the more prominent the twisted structure of the tubular structure 1, the greater the disturbance of the air flow, and the greater the temperature of the heated air. However, the air resistance coefficient increases, resulting in a decrease in the hot gas flow. In summary, when the short-long axis ratio is in the range of 0.4-0.8, the air heat exchange is good, and the cigarette is well roasted by the heated air flow. Further, when the short-long axis ratio is in the range of 0.5-0.7, the air heat exchange is better, and the cigarette is better roasted by the heated air flow. At the same time, the air resistance coefficient is not very large, and the gas can quickly heat the cigarette after being heated, so that the overall average smoke concentration is optimal.

[0048] In one embodiment, when the tubular structure 1 is a spiral structure, the ratio of the total length of the tubular structure 1 to the pitch is 1-10.

[0049] It should be noted that the greater the number of turns L / S of the tubular structure 1, the greater the degree of twisting of the tubular structure 1, the greater the mixing and heat exchange of the gas in the tubular structure 1, thereby enhancing the heat exchange, but also resulting in a larger flow resistance coefficient f and a decrease in the gas flow per unit time.

[0050] According to Table 2, when the short-long axis ratio is the same, the greater the number of twist turns of the tubular structure 1, the more prominent the twisted structure of the tubular structure 1, the disturbance of the air flow increases, the air heating temperature gradually increases, but the air resistance coefficient increases, resulting in a decrease in hot air flow flux. In summary, when the number of twist turns is in the range of 1-10, the air heat exchange is good, and the cigarette is roasted by the hot air flow. Further, when the number of twist turns is in the range of 1-2, the air heat exchange is better, and the cigarette is roasted by the hot air flow. At the same time, the air resistance coefficient is not very large, and the gas can quickly heat the cigarette after being heated, so that the overall average smoke concentration is optimal

[0051] Table 2 Change of tubular structure heating with twist turns when short-long axis ratio is the same

[0052] In addition to the air heating structure described above, the present application also provides a smoking set comprising the air heating structure disclosed in the above embodiments. The structure of other parts of the smoking set can refer to the prior art, and will not be described here.

[0053] In addition, it should be noted that the "inside and outside" and other indications of the orientation or position relationship in the present application are based on the orientation or position relationship shown in the drawings, and are only for the purpose of simplifying the description and facilitating understanding, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0054] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all the embodiments provided by the present application is within the scope of protection of the present application, and will not be described here.

[0055] The air heating structure and smoking set provided by the present application have been described in detail. The principles and implementation methods of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be noted that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An air heating structure, characterized in that: include: At least two tubular structures (1), each of the tubular structures (1) is arranged in the same direction to form a heat exchange tube bundle (2), air circulates inside the tubular structure (1), and the tubular structure (1) is used to generate heat after being powered on. The tubular structure (1) includes a spiral tube, or a non-twisted flat tube, or a spiral flat tube, or a porous tube structure.

2. The air heating structure according to claim 1, characterized in that: The tubular structure (1) comprises a piece of material with high thermal conductivity and high electrical conductivity.

3. The air heating structure according to claim 1, characterized in that: The tubular structure (1) comprises an inner tube and an outer tube sleeved on the outer periphery of the inner tube, the inner tube being made of an electric heating material with high electrical conductivity, and the outer tube being made of a heat storage material with high thermal conductivity and high heat capacity.

4. The air heating structure according to claim 3, characterized in that: The electric heating material piece includes electric heating fiber, electric heating wire, electric heating belt, electric heating film, electric heating sheet, electric heating tube or electric heating plate.

5. The air heating structure according to claim 3, characterized in that: The heat storage material piece includes a ceramic material piece or a metal material piece.

6. The air heating structure according to claim 3, characterized in that: The inner tube and the outer tube are an integral structural member.

7. The air heating structure according to any one of claims 1 to 6, characterized in that: When the tubular structure (1) is a flat tube structure, the ratio of the short axis length to the long axis length of the tubular structure (1) is 0.4-0.

8.

8. The air heating structure according to any one of claims 1 to 6, characterized in that: When the tubular structure (1) is a spiral structure, the ratio of the total length of the tubular structure (1) to the pitch is 1-10.

9. A smoking article, characterized in that: The air heating structure comprises the air heating structure according to any one of claims 1 to 8.

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