Heating tube and electronic cigarette

Abstract

The present invention discloses a heating tube and an electronic cigarette, wherein the heating tube comprises a hollow tube, a heating circuit, and a thermal insulation layer. The hollow tube has a hollow chamber for accommodating an object to be heated; the heating circuit is embedded in the outer wall of the hollow tube to heat the hollow tube; the thermal insulation layer is provided on the outer circumference of the hollow tube; the heating circuit comprises a conductive fiber or conductive paste circuit. The technical solution of the present invention improves the uniformity of heating of the heating tube.

Description

Technical Field

[0001] The present invention relates to the technical field of heating devices, and in particular to a heating tube and an electronic cigarette. Background Art

[0002] The heating element in an e-cigarette is an electric heating device that converts electrical energy into heat. Based on the heating principle, heating elements can be generally divided into two categories: resistance heating and electromagnetic induction heating. Compared to electromagnetic induction heating, heating elements using resistance heating have a simpler structure and can directly use DC current as an external power source, making them more widely applicable. However, uneven heating in heating elements can lead to a poor product experience. Summary of the Invention

[0003] The main purpose of the present invention is to provide a heating tube and an electronic cigarette, aiming to make the heating tube heat evenly.

[0004] To achieve the above-mentioned purpose, the present invention proposes a heating tube, which is applied to electronic cigarettes. The heating tube includes a hollow tube, a heating circuit and a thermal insulation layer. The hollow tube has a hollow chamber, which is used to accommodate an object to be heated; the heating circuit is embedded in the outer wall of the hollow tube to heat the hollow tube; the thermal insulation layer is arranged on the outer periphery of the hollow tube; wherein the heating circuit includes a conductive fiber or a conductive paste circuit.

[0005] In one embodiment, the heating circuit has a first end and a second end at its ends, and the first end and the second end are respectively connected to two electrodes, and the two electrodes are located at two ends of the hollow tube.

[0006] In one embodiment, the heating circuit extends along the circumference of the hollow tube and is arranged in a spiral shape.

[0007] In one embodiment, the heating circuit includes multiple first heating segments and multiple second heating segments, the multiple first heating segments extend along the axial direction of the hollow tube, and the multiple second heating segments extend along the circumferential direction of the hollow tube. The second heating segment connects two adjacent first heating segments located at the same end of the hollow tube, so that the multiple first heating segments are connected in sequence.

[0008] In one embodiment, the ends of the heating circuit are respectively connected to two electrodes, and the two electrodes are located at the same end of the hollow tube.

[0009] In one embodiment, the conductive fibers are carbon fibers, TiO2 fibers, SiO2 fibers, alumina fibers, Li4Ti5O 12 fiber, LiN fiber, Fe-Cr-Al fiber, SiC fiber and metal-modified SiC fiber, polyaniline fiber, aramid fiber or more; and / or,

[0010] The conductive paste circuit is made of one or more of carbon black paste, silver paste, metal powder paste, carbon nanotube paste, and graphene paste; and / or,

[0011] The hollow tube is made of one of alumina, aluminum nitride, quartz, silicon carbide, silicon nitride, carbon fiber reinforced ceramic matrix composite material and polycrystalline diamond.

[0012] In one embodiment, the heating tube further includes an infrared reflection layer, which is disposed between the hollow tube and the thermal insulation layer. The infrared reflection layer is provided with a serrated or wavy reflection structure, and the reflection structure is used to reflect the heat generated by the heating circuit to the hollow tube portion between any two adjacent first heating sections.

[0013] In one embodiment, the reflective structure is provided with a plurality of reflective surfaces, each of the reflective surfaces having a proximal end close to the hollow tube and a distal end away from the hollow tube, the proximal end of the reflective surface facing the heating circuit; the proximal ends of the two reflective surfaces are connected, and the distal ends of the two reflective surfaces are spaced apart; the line connecting the distal ends of the two reflective surfaces is defined as a first straight line, the connection between the proximal end of the reflective surface and its distal end is defined as a second straight line, and the angle between the first straight line and the second straight line is 5°-10°.

[0014] In one embodiment, the reflective structure is sawtooth-shaped, and the reflective surface is a flat surface; or, the reflective structure is wavy, and the proximal ends of the two reflective surfaces are connected to form an arc surface.

[0015] In one embodiment, the reflective structure is extended along the axis of the hollow tube or along the circumference of the hollow tube; and / or, an insulating layer is provided on a side of the infrared reflective layer facing away from the heat insulation layer.

[0016] In one embodiment, the infrared reflective layer is made of aluminum foil or nickel foil; and / or,

[0017] The insulating layer includes a silica sol coating, a phosphate coating, or a polyimide film; and / or,

[0018] The heat insulation layer is made of porous ceramics, ceramic fiber cloth or rubber material.

[0019] The present invention also proposes an electronic cigarette, which includes a heating tube, which includes a hollow tube, a heating circuit and a thermal insulation layer. The hollow tube has a hollow chamber, which is used to accommodate an object to be heated; the heating circuit is embedded in the outer wall of the hollow tube to heat the hollow tube; the thermal insulation layer is arranged on the outer periphery of the hollow tube; wherein the heating circuit includes a conductive fiber or a conductive paste circuit.

[0020] The technical solution of the present invention adopts a heating circuit set in the tube wall of the hollow tube. After the external power supply supplies power to the heating circuit, the heating circuit can generate a large amount of ohmic heat in a short period of time, and quickly transfer the heat to the object in the hollow chamber through the hollow tube, so that the object is heated. The object to be heated can be in contact with the hollow tube to receive the heat of the hollow tube, or it can transmit heat through the gas in the hollow chamber. Since the heating circuit is embedded in the tube wall of the hollow tube, the contact area with the hollow tube is increased, which is beneficial for the transfer of heat from the heating circuit to the hollow tube, thereby improving the thermal conductivity of the product's heating tube. In this way, the heating circuit is used to heat the hollow tube. Compared with the use of a heating film, the heating circuit is less likely to crack, so that the hollow tube can be heated evenly, and the durability of the heating tube is also improved, extending the service life of the heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a structural schematic diagram of an embodiment of a heating tube of the present invention;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of an embodiment of a heating tube of the present invention;

[0024] Figure 3 This is a schematic structural diagram of an embodiment of a heating tube (conductive fiber) of the present invention;

[0025] Figure 4 This is a structural diagram of an embodiment of a heating tube (conductive paste circuit) of the present invention;

[0026] Figure 5 This is a structural diagram of an embodiment of a heating tube (conductive paste circuit, with the infrared reflective layer removed) of the present invention;

[0027] Figure 6 This is a schematic structural diagram of an embodiment of a reflective structure of the present invention;

[0028] Figure 7 It is a structural schematic diagram of another embodiment of the reflective structure of the present invention;

[0029] Figure 8 for Figure 7 A partial enlarged view of point A in the middle;

[0030] Figure 9This is a structural diagram of another embodiment of the reflective structure of the present invention.

[0031] Description of Figure Numbers:

[0032] Label name Label name 10 Heating tube 300 Insulation layer 100 Hollow tube 400 electrode 100a Hollow chamber 500 Infrared reflective layer 200 Heating circuit 510 Reflective structure 200a Conductive fibers 511 reflective surface 200b Conductive paste circuit 511a proximal 201 First End 511b remote 202 Second end 521 First straight line 210 First heating section 522 Second straight line 220 Second heating section

[0033] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The present invention provides a heating tube.

[0038] In the embodiment of the present invention, please refer to Figures 1 to 2 、 Figure 4The heating tube 10 is applied to an electronic cigarette. The heating tube 10 includes a hollow tube 100, a heating circuit 200 and a heat-insulating layer 300. The hollow tube 100 has a hollow chamber 100a, and the hollow chamber 100a is used to accommodate an object to be heated; the heating circuit 200 is embedded in the outer wall of the hollow tube 100 to heat the hollow tube 100; the heat-insulating layer 300 is arranged on the outer periphery of the hollow tube 100; wherein, the heating circuit 200 includes a conductive fiber 200a or a conductive paste circuit 200b.

[0039] For details, please refer to Figures 1 to 2 The hollow tube 100 is a tubular structure and can be a round tube, a square tube, or other regular or irregular shapes. The specific shape can be set and selected according to actual conditions. After being heated, the hollow tube 100 can transfer heat to the object to be heated, thereby heating the object to be heated. The hollow tube 100 is made of a material with high heat transfer efficiency to reduce heat loss and improve the thermal efficiency of the hollow tube 100.

[0040] Please refer to Figures 1 to 3 The hollow tube 100 has a hollow chamber 100a, which can pass through the opposite ends of the hollow tube 100 and extend along the axis of the hollow tube 100. The radial cross-sectional shape of the hollow chamber 100a along the hollow tube 100 can be circular, or can be a regular or irregular shape such as a quadrilateral or pentagon. In order to increase the contact area between the hollow tube 100 and the object to be heated, please refer to Figures 1 to 2 In one embodiment, the cross-sectional shape of the hollow chamber 100a along the radial direction of the hollow tube 100 is circular, which not only facilitates the contact area between the object to be heated and the cavity wall of the hollow chamber 100a, but also enables the hollow tube 100 to heat the periphery of the object to be heated evenly, which facilitates uniform heating of the object to be heated, thereby producing better product effects.

[0041] Please continue to refer to Figures 1 to 2 The hollow chamber 100a is used to accommodate the object to be heated, which can be a cigarette cartridge. Heating the object through the hollow tube 100 allows the active ingredients and aromatic substances in the cigarette cartridge to be more easily released, producing a tobacco flavor and achieving a smoking effect close to that of real cigarettes, while avoiding combustion and most of the toxic and harmful substances produced by high-temperature combustion.

[0042] Please refer to Figure 1 and Figure 4The heating circuit 200 generates heat when powered on. The heating circuit 200 is embedded in the outer wall of the hollow tube 100, which not only realizes contact heating of the hollow tube 100, but also increases the contact area between the heating circuit 200 and the hollow tube 100, which is beneficial to the heating of the hollow tube 100. In addition, since the heating circuit 200 is set on the outer wall, the heating circuit 200 will not directly contact the object to be heated. Instead, after being heated by the hollow tube 100, the heat is transferred to the object to be heated, thereby avoiding excessive local temperature of the object to be heated, thereby further improving the uniformity of heating of the heating tube 10. Moreover, since the heating circuit 200 is not in direct contact with the object to be heated, there is no need to clean and maintain the heated object. Cleaning can be completed by wiping the inner wall of the hollow chamber 100a, which makes the heating tube 10 more convenient and quick to clean and maintain.

[0043] The heating circuit 200 is made of a material that generates heat when energized, and can be a conductive fiber 200a or a conductive paste circuit 200b. When energized, the conductive fiber 200a or conductive paste circuit 200b generates a large amount of heat, which is transferred to the hollow tube 100, allowing the hollow tube 100 to heat the object to be heated within the hollow chamber 100a. The conductive fiber 200a can have an interference fit with the hollow tube 100, thereby being embedded in the outer wall of the hollow tube 100; or it can be fixed to the hollow tube 100 using a high-temperature resistant adhesive, so that the conductive fiber 200a is embedded in the outer wall of the hollow tube 100. The conductive paste circuit 200b can be printed on the outer wall of the hollow tube 100.

[0044] Please refer to Figures 3 and 4 The heating circuit 200 is arranged in a linear shape and has a certain thickness, which is relatively thick compared to a thin film. Therefore, even if the thickness of the heating circuit 200 is uneven, no cracks will be generated, resulting in damage to the heating circuit 200, thereby making the heating of the hollow tube 100 uniform. In addition, the heating circuit 200 is not made of nanomaterials, the preparation process is simple, and the materials are easy to obtain. It should be noted that the heating circuit 200 can be arranged with a circular cross-section or a quadrilateral cross-section, such as a flat cross-section; or the side of the heating circuit 200 embedded in the hollow tube 100 can be arranged with an arc surface, thereby further increasing the contact area between the heating circuit 200 and the hollow tube 100.

[0045] Please refer to Figures 1 to 2The outer periphery of the hollow tube 100 is covered with a thermal insulation layer 300. This thermal insulation layer 300 wraps around the outer wall of the hollow tube 100, thereby reducing heat loss due to outward diffusion and enhancing the heating effect of the hollow tube 100. It also reduces the temperature of the outer packaging of the heating tube 10, preventing the outside of the heating tube 10 from overheating and preventing burns. It also improves the structural strength of the heating tube 10. The thermal insulation layer 300 is made of a thermal insulation material to isolate the internal heat from the external environment. The thermal insulation layer 300 can be a sleeve structure, and the thickness of the thermal insulation layer 300 can be 0.1mm to 1.0mm. Furthermore, the thickness of the thermal insulation layer 300 can be 0.1mm to 0.5mm.

[0046] The present invention utilizes a heating circuit 200 embedded within the wall of the hollow tube 100. When powered by an external power source, the heating circuit 200 quickly generates a significant amount of ohmic heat. This heat is then rapidly transferred through the hollow tube 100 to an object within the hollow chamber 100a, raising the object's temperature. The object to be heated can either contact the hollow tube 100 to receive heat from it or transmit heat through the gas within the hollow chamber 100a. Because the heating circuit 200 is embedded within the wall of the hollow tube 100, the contact area with the hollow tube 100 is increased, facilitating heat transfer from the heating circuit 200 to the hollow tube 100 and improving the thermal conductivity of the product's heating tube 10. Thus, using the heating circuit 200 to heat the hollow tube 100 is less prone to cracking than using a thin film heater, resulting in uniform heating of the hollow tube 100. This also improves the durability of the heating tube 10 and extends its service life.

[0047] Please refer to Figure 3 In one embodiment, the heating circuit 200 has a first end 201 and a second end 202 at both ends, and the first end 201 and the second end 202 are respectively connected to two electrodes 400 , and the two electrodes 400 are located at both ends of the hollow tube 100 .

[0048] Please continue to refer to Figure 3 The head end of the heating circuit 200 is the first end 201, and the tail end of the heating circuit 200 is the second end 202. The first end 201 and the second end 202 are used to connect to the electrode 400. The first end 201 can be connected to the positive electrode, and the second end 202 can be connected to the negative electrode; the first end 201 and the second end 202 can be located at opposite ends of the hollow tube 100 in its extension direction.

[0049] In order to further improve the heating uniformity of the hollow tube 100, please refer to Figures 2 to 3 In one embodiment, the heating circuit 200 extends along the circumference of the hollow tube 100 and is arranged in a spiral shape.

[0050] Please continue to refer to Figures 2 to 3 The heating circuit 200 can be spirally wound and embedded in the outer wall of the hollow tube 100, thereby heating the hollow tube 100. The distance between the line segments of two adjacent heating circuits 200 wound around the hollow tube 100 can be the same or different. In order to ensure uniform heating of the hollow tube 100, in one embodiment, the distance between the line segments of two adjacent heating circuits 200 is the same.

[0051] Please refer to Figure 3 The first end 201 and the second end 202 of the spirally wound heating circuit 200 can be located at opposite ends of the hollow tube 100, or the heating circuit 200 can be wound from one end of the hollow tube 100 to the other end and then turned back to the starting end, so that the first end 201 and the second end 202 of the heating circuit 200 are both located at the same end of the hollow tube 100.

[0052] Please refer to Figures 4 and 5 In one embodiment, the heating circuit 200 includes a plurality of first heating segments 210 and a plurality of second heating segments 220, wherein the plurality of first heating segments 210 extend along the axial direction of the hollow tube 100, and the plurality of second heating segments 220 extend along the circumferential direction of the hollow tube 100, and the second heating segments 220 connect two adjacent first heating segments 210 located at the same end of the hollow tube 100, so that the plurality of first heating segments 210 are connected in sequence.

[0053] Please refer to Figure 5 The plurality of first heating sections 210 are arranged at intervals along the axis of the hollow tube 100. The lengths of the plurality of first heating sections 210 can be the same or different. In order to improve the uniformity of heating the hollow tube 100, in one embodiment, please continue to refer to Figure 5 , the lengths of the plurality of first heating sections 210 are the same. Similarly, the lengths of the plurality of second heating sections 220 can be the same or different.

[0054] Please refer to Figures 4 and 5The plurality of second heating segments 220 located at one end of the hollow tube 100 form a first heating group, and the plurality of second heating segments 220 located at the other end of the hollow tube 100 form a second heating group. The second heating segments 220 of the first heating group are used to connect two adjacent first heating segments 210 located at one end of the hollow tube 100, and the second heating segments 220 of the second heating group are used to connect two adjacent first heating segments 210 located at the other end of the hollow tube 100. The second heating segments 220 of the first heating group and the second heating segments 220 of the second heating group are staggered so that the plurality of first heating segments 210 can be connected in sequence to form a circuit, thereby heating the hollow tube 100. In other words, the heating circuit 200 extends along the axis of the hollow tube 100 and is arranged back and forth to be laid on the tube wall of the hollow tube 100, so that the heating of the hollow tube 100 is more uniform.

[0055] The beginning and the end of the heating circuit 200 can be located at opposite ends of the hollow tube 100, or at the same end as the hollow tube 100. Figures 4 and 5 In one embodiment, the ends of the heating circuit 200 are respectively connected to two electrodes 400, and the two electrodes 400 are located at the same end of the hollow tube 100, thereby making it easier to route the heating tube 10 and connect the heating circuit 200 to a power source. Moreover, while uniformly heating the hollow tube 100, the heating circuit 200 does not need to be deliberately wound around in order to locate the two electrodes 400 at the same end of the hollow tube 100, thereby saving costs (the heating circuit 200 is expensive).

[0056] The number of heating circuits 200 can be one or more. In one embodiment, the heating tube 10 is provided with multiple heating circuits 200, which extend axially along the hollow tube 100 and are spaced apart. One end of each of the multiple heating circuits 200 can be connected to the same electrode 400, such as with a wire; or they can be connected to different electrodes 400. Multiple electrodes 400 at the same end can be connected in parallel. Similarly, the other ends of the multiple heating circuits 200 can be connected to the same electrode 400 or different electrodes 400.

[0057] Unlike the previous embodiment, in one embodiment, the heating tube 10 is provided with multiple heating circuits 200, extending circumferentially along the hollow tube 100 and spaced apart. The heating circuits 200 can be arranged in a ring-shaped configuration with a notch. One end of the heating circuit 200 at the notch is connected to one electrode 400, while the other end of the heating circuit 200 at the notch is connected to another electrode 400. Similarly, multiple heating circuits 200 can each be connected to the same electrode 400 at one end and to another electrode 400 at the other end; alternatively, multiple heating circuits 200 can each be connected to different electrodes 400 at one end.

[0058] The spacing between two adjacent heating circuits 200 in the axial direction of the hollow tube 100 can be equal or different. In one embodiment, the spacing between two adjacent heating circuits 200 in the axial direction of the hollow tube 100 is equal to improve heating uniformity of the hollow tube 100. The notches of multiple heating circuits 200 can be located on the same straight line, or the notches of two adjacent heating tubes 10 can be staggered. In one embodiment, the notches of multiple heating circuits 200 are not located on the same straight line, thereby avoiding lower temperatures on one side of the hollow tube 100 and further improving heating uniformity of the hollow tube 100.

[0059] The heating line 200 can be made of a variety of materials. In one embodiment, the conductive fibers 200a are made of carbon fibers, TiO2 fibers, SiO2 fibers, alumina fibers, Li4Ti5O 12 The conductive fibers 200a are made of one or more of the following: fibers, LiN fibers, Fe-Cr-Al fibers, SiC fibers, metal-modified SiC fibers, polyaniline fibers, and aramid fibers. By using the above materials to make the conductive fibers 200a, the conductive fibers 200a rapidly generate heat when energized, thereby rapidly heating the hollow tube 100 to the desired heating temperature of the object to be heated. The conductive fibers 200a generate heat stably, providing a good user experience.

[0060] When conductive fibers 200a are made of carbon fibers, they have high electrical conductivity and are ideal materials for resistive heating. Depending on the number of fibers per bundle (1k-24k), the resistance along the fiber direction ranges from approximately 10-500Ω / m. Therefore, the heating efficiency of hollow tube 100 can be adjusted by using carbon fibers with varying fiber counts.

[0061] The conductive paste circuit 200b can be made from a variety of materials. In one embodiment, the conductive paste circuit 200b is made from one or more of carbon black paste, silver paste, metal powder paste, carbon nanotube paste, and graphene paste. The conductive paste circuit 200b can be printed on the outer surface of the hollow tube 100. After high-temperature sintering and curing, the hollow tube 100 and the conductive paste circuit 200b form a single unit, thereby improving the stability of the connection between the conductive paste circuit 200b and the hollow tube 100.

[0062] When the conductive paste circuit 200 b is made of high-temperature silver paste, the thickness of the high-temperature silver paste circuit can be controlled during printing to adjust the resistance of the heating circuit and further adjust the heating efficiency of the heating tube 10 .

[0063] The hollow tube 100 can be made of a material with high thermal conductivity, and the hollow tube 100 contains an object to be heated to conduct heat efficiently. In one embodiment, the hollow tube 100 is made of one of alumina, quartz, aluminum nitride, silicon carbide, silicon nitride, carbon fiber reinforced ceramic matrix composite material and polycrystalline diamond. When the hollow tube 100 is made of aluminum nitride, the thermal conductivity of the hollow tube 100 is about 140-200W / mK, which is 10 times that of the commonly used stainless steel tube and far higher than the thermal conductivity of most engineering plastics, so it can achieve more efficient heat conduction. Furthermore, the hollow tube 100 made of aluminum nitride can be a thin tube, that is, its thickness is thin, thereby reducing the volume and weight of the product, which is conducive to the miniaturization design of the product.

[0064] The insulation layer 300 can be made of a variety of materials. In one embodiment, the insulation layer 300 is made of porous ceramic, ceramic fiber cloth, or rubber. This reduces the outer packaging temperature of the heating tube 10, improves the structural strength of the heating tube 10, and extends the product's service life. In one embodiment, when the insulation layer 300 is made of a porous ceramic material, the porous ceramic can be SiO2 porous ceramic foam, which effectively isolates heat and provides a certain degree of structural strength for support.

[0065] In one embodiment, the hollow tube 100 is made of aluminum nitride, the conductive fibers 200a are made of carbon fibers, and the thermal insulation layer 300 is made of porous ceramic. In another embodiment, the hollow tube 100 is made of aluminum nitride, the conductive fibers 200a are made of high-temperature silver paste, and the thermal insulation layer 300 is made of porous ceramic.

[0066] Please refer to Figure 2 、 Figure 4 and Figure 6 In one embodiment, the heating tube 10 further includes an infrared reflection layer 500, which is disposed between the hollow tube 100 and the heat insulation layer 300. The infrared reflection layer 500 is provided with a serrated or wavy reflection structure 510, and the reflection structure 510 is used to reflect the heat generated by the heating circuit 200 to the portion of the hollow tube 100 between any two adjacent first heating sections 210.

[0067] The reflective structure 510 is used to reflect heat to the portion of the hollow tube 100 that is not provided with the heating circuit 200. Figure 2 and Figure 6When the reflective structure 510 reflects the heat generated by the heating circuit 200 to between any two adjacent first heating sections 210, or to between the line segments of two heating circuits 200, the portion of the hollow tube 100 where the heating circuit 200 is not provided is heated, thereby avoiding the relatively low temperature of the portion of the hollow tube 100 where the heating circuit 200 is not provided, and further improving the uniformity of heating the hollow tube 100.

[0068] There are many types of reflective structures 510, as long as they can reflect the heat generated by the heating circuit 200 to the hollow tube 100 portion between any two adjacent first heating sections 210. Figure 4 、 Figure 7 and Figure 9 In one embodiment, the reflective structure 510 is provided with a plurality of reflective surfaces 511, each of which has a proximal end 511a close to the hollow tube 100 and a distal end 511b away from the hollow tube 100, wherein the proximal end 511a of the reflective surface 511 faces the heating circuit 200; the proximal ends 511a of the two reflective surfaces 511 are connected, and the distal ends 511b of the two reflective surfaces 511 are spaced apart; please refer to Figure 7 and Figure 8 , define the line connecting the distal ends 511b of the two reflecting surfaces 511 as a first straight line 521, and the line connecting the proximal end 511a of the reflecting surface 511 and its distal end 511b as a second straight line 522, and the angle α between the first straight line 521 and the second straight line 522 is 5°-10°.

[0069] Please refer to Figures 7 and 8 Relative to the thermal insulation layer 300, the end of the reflective surface 511 closer to the heating circuit 200 is the proximal end 511a, and the end of the reflective surface 511 farther from the heating circuit 200 is the distal end 511b. The proximal end 511a of one reflective surface 511 is connected to the proximal end 511a of another reflective surface 511, and the distal end 511b of another reflective surface 511 is connected to the distal end 511b of yet another reflective surface 511, thereby forming a reflective structure 510. Because the proximal ends 511a of the two reflective surfaces 511 are connected, and the connected proximal ends 511a face the heating circuit 200, the reflective surface 511 moves away from the heating circuit 200 from the proximal end 511a to the distal end 511b, thereby reflecting heat to the portion of the hollow tube 100 between any two adjacent first heating segments 210.

[0070] Please continue to refer to Figures 7 and 8The proximal ends 511a of the two reflective surfaces 511 are connected, and the distal ends 511b of the two reflective surfaces 511 are spaced apart. The line connecting the distal ends 511b of the two reflective surfaces 511 is defined as a first straight line 521, and the line connecting the proximal end 511a and the distal end 511b of the reflective surface 511 is defined as a second straight line 522. The angle α between the first straight line 521 and the second straight line 522 cannot be too large or too small. If the angle α is too large, the height of the reflective structure 510 will be too large, and the distance between the infrared reflective layer 500 and the hollow tube 100 will need to be increased. If the angle α is too small, the reflection angle is insufficient and is not sufficient to reflect light between the two first heating sections 210. Therefore, the angle α is 5°-10°.

[0071] For further information, please refer to Figure 4 and Figure 7 In one embodiment, the reflective structure 510 is serrated, and the reflective surface 511 is a flat surface. By configuring the reflective surface 511 as a flat surface, two adjacent reflective surfaces 511 can be connected end-to-end or end-to-end, thereby reflecting the heat generated by the heating circuit 200, improving the heating uniformity of the hollow tube 100, and providing a precise and reliable reflection angle.

[0072] Please refer to Figure 9 In one embodiment, the reflective structure 510 is wavy, and the proximal ends 511a of the two reflective surfaces 511 are connected so that the two reflective surfaces 511 form an arc surface. Figure 8 Two adjacent arc surfaces are connected end to end, and multiple arc surfaces can be arranged along the circumference of the hollow tube 100, thereby heating the hollow tube 100 in the axial direction. The arc surface faces the heating circuit 200, and the heat generated by the heating circuit 200 is reflected to a larger range of the hollow tube 100, which is more conducive to uniform heating of the hollow tube 100.

[0073] Please refer to Figure 4 In one embodiment, the reflective structure 510 is arranged to extend along the axis of the hollow tube 100 or along the circumference of the hollow tube 100. Depending on the actual direction of the heating circuit 200 in the hollow tube 100, the reflective structure 510 of the infrared reflective layer 500 can partially extend along the axis of the hollow tube 100 or partially extend along the circumference of the hollow tube 100, thereby reflecting heat to the portion of the hollow tube 100 where the heating circuit 200 is not provided, thereby improving the uniformity of heating of the hollow tube 100.

[0074] Understandably, please refer to Figure 4 The reflective structure 510 of the infrared reflective layer 500 may be extended only along the axis of the hollow tube 100 , thereby reflecting the heat generated by the heating circuit 200 to between any two adjacent first heating sections 210 .

[0075] To avoid electric shock and improve product safety, please refer to Figure 2 and Figure 4 In one embodiment, an insulating layer (not shown) is provided on the side of the infrared reflective layer 500 facing away from the thermal insulation layer 300. Specifically, the insulating layer is provided on the side of the infrared reflective layer 500 facing the hollow tube 100 to isolate the heating circuit 200 from the outside, thereby providing insulation. Furthermore, when the infrared reflective layer 500 is made of a metal material, the insulating layer can also isolate the infrared reflective layer 500, thereby preventing contact and short circuiting between the heating circuit 200 and the infrared reflective layer 500, thereby ensuring the proper operation of the heating tube 10.

[0076] Please refer to Figure 4 、 Figure 7 and Figure 9 To prepare the heating tube 10, a reflective structure 510 (zigzag, wavy, etc.) is first molded and covered with an insulating layer on the inner surface. The infrared reflective layer 500 is then applied to the outer wall of the hollow tube 100 and secured with high-temperature adhesive. Finally, the hollow tube 100 covered with the infrared reflective layer 500 is inserted into the insulating sleeve.

[0077] The insulating layer can be transparent or opaque. In one embodiment, the insulating layer is transparent. This prevents the insulating layer from absorbing heat, reduces heat loss, and allows the heat to be reflected back into the hollow tube 100 by the infrared reflective layer 500. Furthermore, when the insulating layer is a coating, its thickness is relatively small, further reducing the volume and weight of the heating tube 10. The insulating layer can be applied to the inner surface of the infrared reflective layer 500 by spraying or painting.

[0078] The insulating layer can be an inorganic film. In one embodiment, the insulating layer includes a silica sol coating or a phosphate coating. Silica sol can be made of nano-scale silicon dioxide particles, which are odorless, non-toxic, transparent, and environmentally friendly. Silica sol has strong permeability, which facilitates the formation of the insulating layer. The phosphate coating is a thin film composed of insoluble phosphates with strong adhesion and is not prone to detachment. In addition, the insulating layer can be a high-temperature resistant polymer film. In one embodiment, the high-temperature resistant polymer film is a polyimide film (PI film).

[0079] The present invention also provides an electronic cigarette, please refer to Figures 1 to 2 The electronic cigarette includes a heating tube 10 and a cigarette cartridge. The cigarette cartridge is placed in the hollow chamber 100a of the heating tube 10. The specific structure of the heating tube 10 refers to the above embodiment. Since the electronic cigarette adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Figures 2 to 3、 Figure 5 The heating circuit 200 of the heating tube 10 is embedded in the outer wall of the hollow tube 100 to heat the hollow tube 100; wherein the heating circuit 200 includes a conductive fiber 200a or a conductive paste circuit 200b.

[0080] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A heating tube, used in electronic cigarettes, characterized in that: include: a hollow tube having a hollow chamber for accommodating an object to be heated; a heating circuit embedded in an outer wall of the hollow tube to heat the hollow tube; a heat-insulating layer, the heat-insulating layer being provided on the outer periphery of the hollow tube; Wherein, the heating circuit comprises a conductive fiber or a conductive paste circuit; The heating circuit includes a plurality of first heating segments and a plurality of second heating segments, wherein the plurality of first heating segments extend along the axial direction of the hollow tube, and the plurality of second heating segments extend along the circumferential direction of the hollow tube, and the second heating segments connect two adjacent first heating segments located at the same end of the hollow tube, so that the plurality of first heating segments are sequentially connected; The heating tube further includes an infrared reflecting layer, which is disposed between the hollow tube and the heat insulating layer. The infrared reflecting layer is provided with a reflecting structure, which is used to reflect the heat generated by the heating circuit to the hollow tube portion between any two adjacent first heating sections. The reflective structure is provided with a plurality of reflective surfaces, each of which has a proximal end close to the hollow tube and a distal end away from the hollow tube, the proximal end of each reflective surface facing the heating circuit; the proximal ends of the two reflective surfaces are connected, and the distal ends of the two reflective surfaces are spaced apart; A line connecting the distal ends of the two reflecting surfaces is defined as a first straight line, and a line connecting the proximal end of the reflecting surface and the distal end thereof is defined as a second straight line, wherein the angle between the first straight line and the second straight line is 5°-10°; The heating circuit has a first end and a second end at its head and tail, the first end and the second end are connected to two electrodes respectively, and the two electrodes are respectively located at two ends of the hollow tube; The heating circuit extends along the circumference of the hollow tube and is arranged in a spiral shape, so as to improve the heating uniformity of the hollow tube.

2. The heating tube according to claim 1, wherein: The head and tail of the heating circuit are respectively connected to two electrodes, and the two electrodes are located at the same end of the hollow tube.

3. The heating tube according to claim 1, wherein: The conductive fibers are carbon fibers, TiO2 fibers, SiO2 fibers, alumina fibers, Li4Ti5O 12 fiber, LiN fiber, Fe-Cr-Al fiber, SiC fiber and metal-modified SiC fiber, polyaniline fiber, aramid fiber or more; and / or, The conductive paste circuit is made of one or more of carbon black paste, silver paste, metal powder paste, carbon nanotube paste, and graphene paste; and / or, The hollow tube is made of one of alumina, quartz, aluminum nitride, silicon carbide, silicon nitride, carbon fiber reinforced ceramic matrix composite material and polycrystalline diamond, and / or, The heat insulation layer is made of porous ceramics, ceramic fiber cloth or rubber material.

4. The heating tube according to claim 1, wherein: The reflective structure is sawtooth-shaped, and the reflective surface is a flat surface; or The reflective structure is wavy, and the proximal ends of the two reflective surfaces are connected to form an arc surface.

5. The heating tube according to claim 1, wherein: The reflective structure is extended along the axis of the hollow tube or extended along the circumference of the hollow tube; and / or, An insulating layer is provided on a side of the infrared reflecting layer facing away from the heat insulating layer.

6. The heating tube according to claim 5, characterized in that The infrared reflection layer is made of aluminum foil or nickel foil; and / or, The insulating layer includes a silica sol coating, a phosphate coating, or a high-temperature resistant polymer film.

7. An electronic cigarette, characterized in that: The heating tube comprises the heating tube according to any one of claims 1 to 6.

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