Cigarette heaters and electric heating smoking devices, thermal insulation devices

Abstract

The present invention proposes a cigarette heater, including a heating component and an insulation component for insulating the heating component; the heating component includes a longitudinal heating chamber; the insulation component includes an insulation tube sleeved outside the heating component along the radial direction of the heating chamber; the insulation tube has an inner tube body and an outer tube body opposite to each other in the radial direction, and a certain distance is spaced between the inner tube body and the outer tube body to form a first insulation chamber; the first insulation chamber is filled with a first powder insulation material; the insulation tube is used to reduce the heat in the heating chamber from being conducted radially to the periphery. The above cigarette heater of the present invention is provided with an insulation component with a plurality of different insulation functional structures outside the heating component, which isolates the conduction and radiation of heat internally and blocks the convection of heat externally, thereby greatly improving the heat barrier as a whole, and achieving the effect of avoiding local overheating of the smoking device and shielding the heat from being transferred outward.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of electronic cigarettes, and in particular to a cigarette heater, an electric heating smoking device, and a heat insulation device. Background Art

[0002] Low-temperature baked electronic cigarettes (also known as low-temperature flue-cured tobacco) are products that smokers place tobacco products (such as cigarettes and tobacco cores) in flue-cured tobacco utensils for electrical heating, and heat and bake tobacco products at a temperature lower than the temperature at which tobacco products can burn until they smoke, thereby inhaling cigarette smoke. Since low-temperature flue-cured tobacco products produce smoke through heating rather than burning with open flames, users are prevented from inhaling a large amount of harmful substances produced by burning tobacco products with open flames, and are gradually being promoted and accepted as alternatives to traditional cigarettes.

[0003] This type of low-temperature flue-cured tobacco product mainly includes two functional modules, namely a tubular heating component for heating cigarettes, and a power component for providing power to the heating component. When the low-temperature flue-cured tobacco product is in use, its heating component needs to generate high temperature to bake the cigarettes, which makes the external heat of the heating component dissipate quickly and causes the internal heat to decrease. Therefore, when in use, on the one hand, the heat dissipates outward, which will cause the user to hold it in the hand and get hot, and the shell and circuit board will heat up, causing overheating damage and malfunction. On the other hand, the internal heating heat of the heating component is not continuous enough, making it difficult for the cigarette to continuously produce enough smoke, and the user's smoking experience is poor.

[0004] Therefore, based on the above situation, an insulation structure for insulating the heating component is usually installed in low-temperature flue-cured tobacco. For example, the vacuum insulation evaporator technical solution adopted in Wei Rufeng's patent No. 201510856387.5, specifically, in this solution, an insulation tube is installed outside the heating element, and the tube wall of the insulation tube includes at least two layers of glass, and there is a vacuum cavity between adjacent glasses. For example, the relatively similar patent No. 201810461864.1 proposes an insulation device for electronic cigarettes, including a vacuum tube sleeved on the outer surface of a ceramic heating tube, an aerogel tube is provided outside the vacuum tube, and an insulation sleeve is further provided outside the aerogel tube; the insulation effect is improved by the combination of these vacuum, aerogel, and insulation sleeves.

[0005] Although the above vacuum insulation method is simple and convenient in implementation, the metal vacuum tube is set outside the electromagnetic heating component, which affects the electromagnetic heating energy efficiency and causes the temperature of the heating body to not rise. At the same time, the metal vacuum tube itself will also generate heat in the electromagnetic field, which greatly reduces its own insulation effect. In addition, after these multi-layer structures are assembled by themselves or in combination with the heating element, air convection conduction on the surface of each tube reduces the insulation effect. Summary of the invention

[0006] In order to solve the problem that the heat insulation effect of electronic cigarettes in the prior art is insufficient and affects the energy efficiency of the heating element, an embodiment of the present invention provides a cigarette heater with excellent heat insulation effect.

[0007] The cigarette heater of the present invention comprises a heating assembly and a heat-insulating assembly for heat-insulating the heating assembly; the heating assembly comprises a longitudinal heating chamber for accommodating cigarettes and a heating element for heating the cigarettes; the feature is that the heat-insulating assembly comprises a heat-insulating tube sleeved outside the heating assembly; the heat-insulating tube comprises an inner tube body and an outer tube body opposite to each other in a radial direction, and a certain distance is provided between the inner tube body and the outer tube body to form a first heat-insulating chamber; the first heat-insulating chamber is filled with a first powder heat-insulating material;

[0008] The heat insulation tube is used to reduce the heat in the heating chamber from being conducted radially toward the periphery.

[0009] Preferably, the thermal insulation tube further comprises an anisotropic material layer stacked outside the outer tube body in a radial direction.

[0010] Preferably, the thermal insulation tube further comprises a second thermal insulation cavity stacked along a radial direction outside the anisotropic material layer; the second thermal insulation cavity is filled with a second powder thermal insulation material.

[0011] Preferably, the anisotropic material layer is configured such that the thermal conductivity in the radial direction is lower than the thermal conductivity in the axial direction.

[0012] Preferably, the thermal conductivity of the anisotropic material layer in the axial direction is greater than 30 times the thermal conductivity in the radial direction.

[0013] Preferably, the thermal conductivity of the anisotropic material layer in the axial direction is 30 to 100 times that of the thermal conductivity in the radial direction.

[0014] Preferably, the first powder thermal insulation material includes at least one of aerogel powder, diatomaceous earth powder or zirconium oxide powder.

[0015] Preferably, the particle size of the first powder thermal insulation material is 500-1000 µm.

[0016] Preferably, the particle size of the first powder thermal insulation material is larger than the particle size of the second powder thermal insulation material;

[0017] The particle size of the second powder thermal insulation material is 1 to 500 μm.

[0018] Preferably, the heat insulation assembly further comprises an outer heat insulation cover which is arranged outside the heat insulation tube; the outer heat insulation cover is used to reduce the radiation of heat in the heating chamber toward the periphery in radial direction.

[0019] Preferably, the thermal emissivity of the outer heat shield is lower than 0.3.

[0020] Preferably, the thickness of the outer heat insulation cover is 0.5-1.5 mm.

[0021] Preferably, the insulation tube is spaced a certain distance from the heating assembly in the radial direction to form a first air medium layer;

[0022] And / or, there is a certain distance between the heat insulation pipe and the outer heat insulation cover in the radial direction to form a second air medium layer.

[0023] Preferably, it also includes a hollow outer shell having an open end, and an end cover seat covering the open end of the outer shell;

[0024] The outer shell and the end cover seat cooperate to form a receiving space, and the heating component and the heat insulation component are arranged in the receiving space.

[0025] The present invention also provides a cigarette heater, comprising a heating component and a heat insulation component for heat insulation of the heating component; the heating component comprises a bracket, an electromagnetic coil wound on the bracket, and an induction heating element electromagnetically coupled to the electromagnetic coil, and a longitudinal heating cavity for accommodating cigarettes is provided in the bracket;

[0026] The heat insulation component comprises a heat insulation tube sleeved outside the heating component; the heat insulation tube comprises an inner tube body and an outer tube body opposite to each other in a radial direction, and a certain distance is provided between the inner tube body and the outer tube body to form a first heat insulation cavity; the first heat insulation cavity is filled with a first powder heat insulation material;

[0027] The inner tube body and the outer tube body are made of non-metallic material;

[0028] The heat insulation tube is used to reduce the heat in the heating chamber from being conducted radially toward the periphery.

[0029] The present invention further proposes an electrically heated smoking device containing the above cigarette heater, comprising a cigarette heating device and a power supply device for supplying power to the cigarette heating device; wherein the cigarette heating device adopts the cigarette heater described in the above embodiment.

[0030] The present invention further proposes a thermal insulation device, comprising an inner tube body and an outer tube body arranged coaxially, wherein the inner cavity of the inner tube body forms a accommodating cavity for accommodating a heat source; and a first thermal insulation cavity is formed by a certain distance between the inner tube body and the outer tube body; and the first thermal insulation cavity is filled with a first powder thermal insulation material.

[0031] Preferably, the heat insulation device further comprises an anisotropic material layer stacked outside the outer tube in a radial direction.

[0032] The above cigarette heater of the present invention is provided with a heat insulation component with a variety of different heat insulation functional structures outside the heating component, which isolates the conduction and radiation of heat internally and blocks the convection of heat externally, thereby greatly improving the heat barrier as a whole, achieving the effect of avoiding local overheating of the smoking device and shielding the heat from being transferred to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0034] Figure 1 This is an exploded schematic diagram of various parts of a cigarette heater provided by an embodiment before assembly;

[0035] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the cigarette heater after the various parts are assembled;

[0036] Figure 3 yes Figure 1 and Figure 2 A schematic diagram of the structure of the heating component from another perspective;

[0037] Figure 4 yes Figure 1 and Figure 2 Schematic diagram of the structure of the heat-insulated tube;

[0038] Figure 5 yes Figure 1 and Figure 2 Schematic diagram of the structure of the middle and outer shell;

[0039] Figure 6 is a schematic structural diagram of a heating assembly provided in another embodiment;

[0040] Figure 7 is a structural schematic diagram of a heating assembly provided by yet another embodiment;

[0041] Figure 8 It is a schematic diagram of the structure of a heat insulation tube provided in another embodiment. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] The embodiment of the present invention provides a cigarette heater, which is applicable to a baking type electronic cigarette and is used to heat a special cigarette. The special cigarette can emit smoke after baking at about 200-320°C. The special cigarette usually includes a cigarette body and a filter. The structure and content of the cigarette heater provided by the embodiment of the present invention can be referred to Figure 1 to Figure 2 and described below.

[0044] The cigarette heater is mainly based on a heating component 10 for heating cigarettes to generate aerosol for inhalation, and is further composed of a heat insulation component 20. At the same time, based on the aesthetic appearance of the cigarette heater and the assembly requirements of various components, the cigarette heater also includes a hollow outer shell 30 with an open end, and an end cover seat 40 covering the open end of the outer shell 30; the outer shell 30 and the end cover seat 40 cooperate to form an internal accommodation space, so as to accommodate the above heating component 10 and the heat insulation component 20 inside, and form a complete cigarette heater after assembly.

[0045] See also Figure 1 and Figure 3 In the embodiment shown, the heating assembly 10 includes a longitudinal heating chamber 11 for accommodating cigarettes A, and a heating element 12 for heating cigarettes A. The formation of the heating element 12 and the heating chamber 11 can be adaptively adjusted according to different heating methods of the product. Figure 1 and Figure 3 In the embodiment, the heating element 12 is designed in a cylindrical shape, and its internal space forms the above-mentioned longitudinal heating cavity 11 for accommodating the cigarette A; at the same time, in order to facilitate the power supply to the heating element 12, the heating element 12 is also provided with electrode pins 121 for subsequent connection with the positive and negative electrodes of the power supply device. In practice, the heating element 12 itself can be made of electric heating materials, such as nickel-chromium-aluminum alloy, stainless steel and other resistive materials commonly used for electronic cigarette heating, or formed by printing heating circuits on the inner wall of a rigid tubular body such as ceramics; therefore, after power is turned on, it generates heat, heats the outer periphery of the cigarette A contained therein, and generates aerosol.

[0046] Corresponding to the structure of the above heating assembly 10, the structure of the heat insulation assembly 20 corresponds to Figure 1 , Figure 2 and Figure 4As shown, it includes an annular heat-insulating tube 21 which is sleeved outside the heating chamber 11 along the radial direction of the heating chamber 11; the heat-insulating tube 21 includes an inner tube body 211 and an outer tube body 212 which are opposite to each other along the radial direction, and a certain distance is set between the inner tube body 211 and the outer tube body 212 to form a first heat-insulating chamber 213 inside; the first heat-insulating chamber 213 is filled with a first powder heat-insulating material, and the first powder heat-insulating material can preferably be aerogel powder, diatomaceous earth powder, zirconium oxide powder and other powder materials with low thermal conductivity. By sleeved the heat-insulating tube 21 outside the heating chamber 11, the heat dissipation from the heating chamber 11 to the outside can be effectively blocked, so as to achieve the effect of reducing the external temperature. According to the product design and the requirements of the heat-insulating effect, the inner tube body 211 and the outer tube body 212 of the heat-insulating tube 21 can be made of non-metallic temperature-resistant plastic material, such as one of the polyimide, Teflon, selenophobia, polyphenylene sulfide or polysulfone resins described above, or made of stainless steel, aluminum alloy and other materials. The first powder insulation material filled in the first insulation cavity 213 reduces the solid conduction of heat through particle gaps, physical expansion, thixotropy, etc. On the other hand, the pore walls on the particle surface can be regarded as the reflection and refraction surfaces of thermal radiation, which effectively blocks the radiation transfer of heat.

[0047] When the above heat insulation tube 21 is assembled with the heating assembly 10, a certain gap is maintained between the inner tube body 211 and the heating element 12 in the radial direction, and a first air medium layer 22 is formed between the inner tube body 211 and the heating element 12 by maintaining a certain gap; air itself is a medium with a relatively low thermal conductivity, and filling the gap between the inner tube body 211 and the heating element 12 with air medium can initially help prevent direct heat conduction. According to the size and space requirements of the product, the thickness of the first air medium layer 22 is preferably 0.5mm to 1.2mm; the thickness of the inner tube body 211 and the outer tube body 212 itself is 0.1 to 0.3mm in implementation. The thickness of the first insulation cavity 213 is 1mm to 5mm, the particle size of the first powder insulation material filled therein is 500 to 1000µm, and the filling volume of the first powder insulation material in the first insulation cavity 213 accounts for 70 to 90% of the cavity volume of the first insulation cavity 213. In practice, the filling volume ratio can be adjusted to the required requirement by adjusting the particle size of the powder particles.

[0048] Furthermore, the heat insulation assembly 20 also includes an outer heat insulation cover 23 which is arranged outside the heat insulation tube 21 along the radial direction of the heat insulation tube 21. The outer heat insulation cover 23 itself is made of high temperature resistant plastic, such as one of the polyimide, Teflon, selenium phosphorus glue, polyphenylene sulfide or polysulfone resins described above, or an aluminum shell. By using the outer heat insulation cover 23 as a supplement to the heat insulation tube 21, on the one hand, a multi-layer heat insulation structure is formed from the inside to the outside, and heat conduction and dispersion are respectively limited, so that the heat of the final heating chamber 11 is well isolated; on the other hand, the outer heat insulation cover 23 and the heat insulation tube 21 have different heat conduction isolation mechanisms, and the outer heat insulation cover 23 is mainly used as a shield for heat radiation to reduce the radiation of heat outward. Based on the effect and requirements of radiation shielding, it is preferred to use a material with a thermal emissivity lower than 0.3 on the basis of the above materials. At the same time, based on the size and preparation requirements of the product, the thickness of the outer heat insulation cover 23 itself is prepared with 0.5 to 1.5 mm, and its shape can be adaptively changed according to the shell shape of different products.

[0049] During the implementation, a certain gap can be maintained between the outer heat insulation cover 23 and the outer tube body 212 of the insulation tube 21 during installation, so that a second air medium layer 24 is formed between the outer heat insulation cover 23 and the outer tube body 212. Similar to the function of the first air medium layer 22 above, the insulation effect is improved through the low thermal conductivity of air.

[0050] Based on product design and the convenience of filling powder insulation materials, the inner tube body 211 and the outer tube body 212 are designed to be separated from each other, and the two opposite ends of the insulation tube 21 in the axial direction are plugged with plastic plugs 25, so that it can be sealed and prevent powder leakage. When the insulation tube 21 of this structure is filled with powder, the opening structure at both ends of the tube can be used. After the interior is evacuated in the open state, the powder insulation material is sucked into the insulation tube 21 using the internal vacuum, which can facilitate smooth filling during the preparation process.

[0051] See also Figure 1 and Figure 5 The outer shell 30 has a first end 31 and a second end 32 opposite to each other along the axial direction of the heating chamber 11; wherein the first end 31 is configured as an insertion end for inserting cigarettes, and the second end 32 is configured as an open end for matching with the end cover seat 40. The first end 31 is provided with a through hole 33 for inserting cigarettes A from the outer shell 30 into the heating chamber 11; the second end 32 is used to install the end cover seat 40, and further forms a mounting base for fixing the silicone member 41, the circuit board 42, the lead slot, the air inlet and other components.

[0052] Further based on the product's deformation design, the heating component 10 and the heat insulation component 20 can be changed accordingly under the above functional structure design; for example, Figure 6Another heating assembly 10a shown in the figure includes a cylindrical cigarette receiving tube 13a, the space inside the cigarette receiving tube 13a forms a longitudinal heating chamber 11a for receiving cigarettes; at the same time, the heating element 12a is a slender metal heating needle arranged along the axial direction of the cigarette receiving tube 13a; when the cigarette is received in the heating chamber 11a, the heating element 12a is directly inserted into the cigarette to heat the inside of the cigarette and generate aerosol. The heat insulation assembly 20 can be sleeved outside the cigarette receiving tube 13a using the above structure to insulate the temperature conducted to the outside of the cigarette receiving tube 13a.

[0053] Or in the implementation, the heating component 10 of the cigarette heater can be further changed to adopt Figure 7 The electromagnetic heating structure shown in the figure specifically includes a cigarette receiving tube 13b, the space inside the cigarette receiving tube 13b forms a longitudinal heating chamber 11b for accommodating cigarettes; a tubular bracket 12b is provided on the outer surface of the cigarette receiving tube 13b, and the tubular bracket 12b is used as a mounting base, and an electromagnetic coil 14b is wound thereon; the cigarette receiving tube 13b itself is made of metal material, and is electromagnetically coupled with the electromagnetic coil 14b, so that it is induced to heat after the electromagnetic coil 14b is energized. Based on the principle of electromagnetic heating, the material of the tubular bracket 12b needs to be a non-metallic material that can withstand the working temperature of the induction heating element 10; in order to avoid the electromagnetic shielding effect formed inside when a metal material is used, which causes the cigarette receiving tube 13b to be unable to be induced to heat. The heat insulation component 20 can be set outside the tubular bracket 12b using the above structure to insulate the temperature conducted to the outside of the cigarette receiving tube 13a.

[0054] Based on the design of further heat insulation optimization, the structure of the heat insulation pipe 21 in the above heat insulation assembly 20 can be seen in another embodiment. Figure 8As shown, it can also include an anisotropic material layer 214a arranged outside the first heat insulation cavity 213a in the radial direction; wherein the anisotropic material has different physical properties in different dimensional directions, and the structure of the present invention utilizes the thermal conductivity of the anisotropic material in different dimensional directions; the material anisotropic direction of the anisotropic material layer 214a is configured so that the thermal conductivity in the radial direction is lower than the thermal conductivity in the axial direction, then when the heat is radially conducted from the heating cavity 11 to the anisotropic material layer 214a, it will be largely converted into dispersed conduction in the axial direction, thereby effectively expanding the local conduction of heat into a larger surface conduction, which is conducive to uniformizing the conduction of temperature in the radial and axial directions, playing a role in reducing the local high temperature, and can also effectively shield the heat source from diffusing outward. In implementation, the above heat-conducting anisotropic material is made of one or more of graphite materials including graphite sheets or graphite powder, graphene coatings, carbon fibers, titanium dioxide polycrystalline films, polycrystalline silicon, etc. Based on the differential setting of heat conduction in the present invention, the thermal conductivity of the anisotropic material layer 214a in the axial direction is 30 times greater than the thermal conductivity in the radial direction. Based on the selection of common materials and the effect of implementation, it is further preferred that the thermal conductivity in the axial direction is 30 to 100 times the thermal conductivity in the radial direction.

[0055] Furthermore, the insulation tube 21 also has a second insulation cavity 215a arranged outside the anisotropic material layer 214a in the radial direction, and the second insulation cavity 215a is also filled with a second powder insulation material with low thermal conductivity such as aerogel powder, diatomaceous earth powder, and zirconium oxide powder. The second insulation cavity 215 is different from the first insulation cavity 213 in terms of functional setting. The second insulation cavity 215 is filled with powder material with lower particle fineness, which is conducive to reducing the gap. It is mainly used to shield the convection of heat and plays a role in blocking the convection of heat. In practice, the second powder insulation material in the second insulation cavity 215 uses a particle size of about 1 to 500µm, and the thermal conductivity is preferably about 0.02 W / (mK).

[0056] The above cigarette heater of the present invention is used to set a heat insulation component with a variety of different heat insulation functional structures outside the heating component, which isolates the conduction and radiation of heat internally and blocks the convection of heat externally, thereby greatly improving the heat barrier as a whole, achieving the effect of avoiding local overheating of the smoking device and shielding the heat from being transferred outward. Figure 2In the example shown in the structure, the heat insulation tube 21 is made of stainless steel, and the first heat insulation cavity 213 with a thickness of 4 mm is filled with aerogel powder with an average particle size of 500 µm. When the smoke is tested, the surface temperature of the outer shell 30 is about 50 degrees; when the average particle size of the filling in the first heat insulation cavity 213 is further increased to 800 µm, the surface temperature of the outer shell 30 is reduced to about 43 degrees during the smoke test. This shows that the particle size of the powder filling can be adjusted to change the insulation effect of the medium on heat conduction.

[0057] The present invention further proposes an electric heating smoking device containing the above cigarette heater, comprising a cigarette heating device and a power supply device for supplying power to the cigarette heating device; wherein the cigarette heating device adopts the cigarette heater described in the above embodiment. The electric heating smoking device of the present invention isolates the conduction and radiation of heat internally and blocks the convection of heat externally through a heat insulation component having multiple layers of different heat insulation structures, thereby greatly improving its thermal resistance as a whole and making the surface temperature of the electric heating smoking device relatively low.

[0058] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention, but are not limited to the embodiments described in the specification. Furthermore, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A cigarette heater, comprising a heating assembly and a heat insulating assembly for heat insulating the heating assembly; the heating assembly comprises a longitudinal heating chamber for accommodating cigarettes and a heating element for heating the cigarettes, the heating element being arranged to heat from the periphery of the cigarettes and / or inserted into the cigarettes for heating; characterized in that: The thermal insulation component comprises a thermal insulation tube sleeved outside the heating component; the thermal insulation tube comprises an inner tube body and an outer tube body opposite to each other in a radial direction, and a certain distance is provided between the inner tube body and the outer tube body to form a first thermal insulation cavity; the first thermal insulation cavity is filled with a first powder thermal insulation material, and the first powder thermal insulation material comprises at least one of aerogel powder, diatomaceous earth powder or zirconium oxide powder; The insulation tube is used to reduce the heat in the heating chamber from being conducted radially to the periphery; the insulation tube also includes an anisotropic material layer stacked in a radial direction outside the outer tube body; the anisotropic material layer is configured so that the thermal conductivity in the radial direction is lower than the thermal conductivity in the axial direction.

2. The cigarette heater according to claim 1, characterized in that: The thermal insulation tube further comprises a second thermal insulation cavity which is stacked along a radial direction outside the anisotropic material layer; the second thermal insulation cavity is filled with a second powder thermal insulation material.

3. The cigarette heater according to claim 1, characterized in that: The thermal conductivity of the anisotropic material layer in the axial direction is greater than 30 times the thermal conductivity in the radial direction.

4. The cigarette heater according to claim 3, characterized in that: The thermal conductivity of the anisotropic material layer in the axial direction is 30 to 100 times that in the radial direction.

5. The cigarette heater according to any one of claims 1 to 4, characterized in that: The particle size of the first powder thermal insulation material is 500-1000 μm.

6. The cigarette heater according to claim 2, characterized in that: The particle size of the first powder thermal insulation material is greater than the particle size of the second powder thermal insulation material; The particle size of the second powder thermal insulation material is 1 to 500 μm.

7. The cigarette heater according to any one of claims 1 to 4, characterized in that: The heat insulation assembly also includes an outer heat insulation cover arranged outside the heat insulation tube; the outer heat insulation cover is used to reduce the radiation of heat in the heating chamber toward the periphery in the radial direction.

8. The cigarette heater according to claim 7, characterized in that: The thermal emissivity of the outer heat shield is lower than 0.

3.

9. The cigarette heater according to claim 7, characterized in that: The thickness of the outer heat insulation cover is 0.5-1.5 mm.

10. The cigarette heater according to claim 7, characterized in that: The insulation tube is spaced a certain distance from the heating assembly in the radial direction to form a first air medium layer; And / or, there is a certain distance between the heat insulation pipe and the outer heat insulation cover in the radial direction to form a second air medium layer.

11. The cigarette heater according to any one of claims 1 to 4, characterized in that: It also includes a hollow outer shell having an open end, and an end cover seat covering the open end of the outer shell; The outer shell and the end cover seat cooperate to form a receiving space, and the heating component and the heat insulation component are arranged in the receiving space.

12. A cigarette heater, comprising a heating component and a heat insulating component for heat insulating the heating component; characterized in that: The heating assembly comprises a bracket, an electromagnetic coil wound on the bracket, and an induction heating element electromagnetically coupled to the electromagnetic coil, and a longitudinal heating cavity for accommodating cigarettes is provided in the bracket; The thermal insulation component comprises a thermal insulation tube sleeved outside the heating component; the thermal insulation tube comprises an inner tube body and an outer tube body opposite to each other in a radial direction, and a certain distance is provided between the inner tube body and the outer tube body to form a first thermal insulation cavity; the first thermal insulation cavity is filled with a first powder thermal insulation material, and the first powder thermal insulation material comprises at least one of aerogel powder, diatomaceous earth powder or zirconium oxide powder; The inner tube body and the outer tube body are made of non-metallic material; The insulation tube is used to reduce the heat in the heating chamber from being conducted radially to the periphery; the insulation tube also includes an anisotropic material layer stacked in a radial direction outside the outer tube body; the anisotropic material layer is configured so that the thermal conductivity in the radial direction is lower than the thermal conductivity in the axial direction.

13. An electrically heated smoking device, comprising a cigarette heating device and a power supply device for supplying power to the cigarette heating device, characterized in that: The cigarette heating device is the cigarette heater according to any one of claims 1 to 12.

14. A heat insulation device for a cigarette heater, characterized in that: The invention comprises an inner tube body and an outer tube body which are coaxially arranged, wherein the inner cavity of the inner tube body forms a receiving cavity for receiving a heat source; and a certain distance is provided between the inner tube body and the outer tube body to form a first heat-insulating cavity; the first heat-insulating cavity is filled with a first powder heat-insulating material, wherein the first powder heat-insulating material comprises at least one of aerogel powder, diatomaceous earth powder or zirconium oxide powder; The heat insulation device further comprises an anisotropic material layer stacked outside the outer tube in a radial direction; the anisotropic material layer is configured such that the thermal conductivity in the radial direction is lower than the thermal conductivity in the axial direction.

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