CN210538916U - Heat insulation structure and low-temperature smoking set thereof - Google Patents

Abstract

The utility model discloses a thermal insulation structure, including phase transition heat pipe, heat pipe and graphite flake, the graphite flake cladding is in on the outer wall of heat pipe, phase transition heat pipe adheres to fix on the inner wall of heat pipe. The utility model also discloses a low temperature smoking set of adopting above-mentioned thermal-insulated structure. The heating cavity is arranged in the heat conduction pipe, and the phase-change heat pipe is arranged in the heat conduction pipe, so that most of heat emitted by the heating cavity is absorbed by the phase-change heat pipe by utilizing the excellent heat conduction performance of the phase-change heat pipe and the heat conduction pipe, and part of heat absorbed by the phase-change heat pipe is transferred to the heat conduction pipe and then transferred to the graphite flake by the heat conduction pipe; one part is transmitted to two ends of the phase change heat pipe, so as to achieve the purpose of guiding the heat to be emitted to the set direction.

Description

Heat insulation structure and low-temperature smoking set thereof

Technical Field

The utility model belongs to the technical field of smoking articles for use, especially, relate to a thermal-insulated structure and low temperature smoking set thereof.

Background

Compared with the traditional cigarette, the heating non-combustion smoking device directly heats the tobacco or nicotine product at the temperature of 220-250 ℃, and the smoke is gradually volatilized after being baked, so that harmful smoke components generated by combustion and thermal degradation of the tobacco in the traditional cigarette can be reduced.

The heating of the incombustible product can be divided into surrounding heating and center heating in form, and various heating techniques such as ceramic heating, film heating, electromagnetic heating and the like have been developed based on the electric heating principle. In the practical application process, because the heating temperature (220-250 ℃) of the heating body of the low-temperature smoking set is higher than the body temperature of a human body, when the low-temperature smoking set works, heat can penetrate through the layer-by-layer structure to reach the shell of the low-temperature smoking set, and when a user uses the low-temperature smoking set, poor user experience can be generated due to overhigh temperature of the side wall of the shell of the low-temperature smoking set; moreover, the internal temperature of the product is too high, which may affect the operational stability of the battery, circuit board, etc.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem that a thermal-insulated structure that can guide the heat to setting for the direction transmission is provided.

The utility model aims to solve the second technical problem that a low temperature smoking set with heat insulation structure that can effectively prevent the transmission of heat to the shell lateral wall is provided.

In order to solve the first technical problem, the following technical scheme is adopted in the application:

the utility model provides a thermal insulation structure, includes phase transition heat pipe, heat pipe and graphite flake, the graphite flake cladding is in on the outer wall of heat pipe, the phase transition heat pipe adheres to and fixes on the inner wall of heat pipe.

In the scheme, the phase-change heat pipe and the heat conduction pipe absorb heat emitted by a heat source in the heat conduction pipe, wherein one part of the heat absorbed by the phase-change heat pipe is transferred to the heat conduction pipe, and the other part of the heat is transferred to the end part of the heat conduction pipe and is emitted from the end part; a part of the heat received by the heat conduction pipe is transferred to the layered graphite sheet, and the other part is transferred to and radiated from the end portion thereof; the layered graphite sheet finally blocks the heat transferred by the heat conduction pipe, and the received heat is conveyed along the extending direction of the layered structure of the layered graphite sheet, so that the purpose of guiding the heat to be dissipated to the set direction is finally achieved.

Furthermore, the inner wall of the heat conduction pipe is uniformly provided with clamping grooves extending along the axial direction of the heat conduction pipe, and the phase change heat pipe is installed in the clamping grooves in a matching manner.

Further, the heat conduction pipe is wrapped with a plurality of layers of graphite sheets.

Further, the phase change heat pipe comprises an evaporation section, a convection section and a condensation section which are connected in sequence, and the condensation section is tightly attached to the inner wall of the heat conduction pipe.

Furthermore, the phase change heat pipe comprises a closed pipe body and a capillary structure layer tightly attached to the inner wall of the pipe body, and phase change liquid is stored in the capillary structure layer.

Furthermore, the outer wall of the heat conduction pipe is concave to form a groove, and the graphite sheet is arranged in the groove.

In order to solve the second technical problem, the following technical solutions are adopted in the present application:

the low-temperature smoking set with the heat insulation structure comprises an outer shell and the heat insulation structure, wherein a heating cavity for loading and heating smoking materials is formed in the outer shell; the heat insulation structure is arranged in the shell and positioned at the periphery of the heating cavity, and the heat conduction pipe of the heat insulation structure is coaxially sleeved outside the heating cavity.

Furthermore, two ends of the heating cavity are provided with openings, wherein one opening end is an air inlet end, and the other opening end is a tobacco product insertion end; the shell is respectively provided with an air inlet communicated with the air inlet end and a cigarette inserting port communicated with the tobacco inserting end, and the air inlet, the heating cavity and the cigarette inserting port are sequentially communicated to form a straight-through type flue.

Further, a tubular heating body is arranged in the shell, and an inner cavity of the tubular heating body forms the heating cavity.

Further, still be equipped with the battery pack for the heat-generating body power supply in the shell, battery pack includes battery and PCB board, the PCB board will the shell is separated and is installed the battery installation cavity of battery with install the heating element installation cavity of thermal-insulated structure and heat-generating body.

Furthermore, the shell is also provided with a dustproof cover which can shield the cigarette inserting port.

Compared with the prior art, the utility model discloses the beneficial effect who has lies in:

1. the heating cavity is provided with a heat conduction pipe, the inner wall of the heat conduction pipe is provided with a phase change heat pipe, the outer wall of the heat conduction pipe is wound with a plurality of layers of layered graphite sheets, when the smoking set works to generate a large amount of heat, the phase change heat pipe and the heat conduction pipe absorb the heat emitted by the heating cavity, wherein one part of the heat absorbed by the phase change heat pipe is transferred to the heat conduction pipe, and the other part of the heat absorbed by the phase change heat pipe is transferred to the end part of; a part of the heat received by the heat conduction pipe is transferred to the layered graphite sheet, and the other part is transferred to and radiated from the end portion thereof; the heat that the final separation heat pipe of stratiform graphite flake transmitted, the lamellar structure extending direction along the stratiform graphite flake of the heat of receiving is carried for can pierce through the very big reduction of heat of stratiform graphite flake, the very big reduction of heat that finally reachs the smoking set shell lateral part, the problem of scalding one's hand that has avoided the high temperature of shell to lead to.

2. The two ends of the heating cavity are provided with openings, one opening end is an air inlet end, the other opening end is a tobacco product insertion end, an air inlet communicated with the air inlet end and a tobacco insertion opening communicated with the tobacco product insertion end are respectively arranged on the shell, and the air inlet, the heating cavity and the tobacco insertion opening are sequentially communicated to form a straight-through flue; the heat transferred to the end parts of the laminar graphite sheet, the heat conducting pipe and the phase change heat pipe is intensively transferred to the air inlet and the smoke inserting port of the low-temperature smoking set to be dissipated, so that the temperature of the side part of the outer shell of the whole low-temperature smoking set can be maintained in a lower range.

3. After external air flow enters the heating cavity from the air inlet, smoke generated by heating the tobacco products is brought into the mouth of a user from the cigarette inserting port, and air is supplied for suction; in the process of smoking of a user, when external cold airflow passes through the air inlet and the smoke inserting port, a heat exchange process exists, so that heat which is intensively transferred to the smoke inserting port and the air inlet of the smoking set is transferred to the airflow and is quickly brought out of the smoking set, and the overhigh temperature of the end part of the smoking set can be effectively prevented; in addition, when the air current passes through air inlet department, the heat of following the heat insulation structure tip and shifting can preheat the air current, the energy saving.

4. The battery and the PCB are isolated by the heat source through the heat insulation structure, the working temperature of the battery and the PCB is lower, and the battery and the PCB are prevented from losing efficacy due to overhigh internal temperature of the smoking set.

Drawings

Fig. 1 is an isometric view of the present invention;

fig. 2 is a main sectional view of the present invention;

fig. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is a schematic view of the thermal insulation structure of the present invention;

FIG. 5 is a schematic view of the inner layered structure and heat conduction of the graphite sheet according to the present invention;

FIG. 6 is a schematic view of the internal heat flow of the graphite sheet according to the present invention;

fig. 7 is a schematic view of a medium phase variable heat pipe structure of the present invention;

fig. 8 is a schematic view of the heat flow inside the phase change heat pipe of the present invention;

FIG. 9 is a liquid-vapor circulation diagram of the interior of a phase change heat pipe according to the present invention;

fig. 10 is a general view of heat flow and vapor-liquid circulation in the phase change heat pipe of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1

Referring to fig. 1 to 4, the low temperature smoking set with the heat insulation structure comprises a housing 1 and the heat insulation structure, wherein a heating cavity 2 for loading and heating tobacco products is formed in the housing 1, and the heat insulation structure is arranged in the housing 1 and is positioned at the periphery of the heating cavity 2. Specifically, thermal-insulated structure includes phase change heat pipe 3, heat pipe 4 and graphite flake 5, and 4 covers of heat pipe are established outside heating chamber 2, and the cladding of graphite flake 5 is on the outer wall of heat pipe 4, and 3 attachments to phase change heat pipe are fixed on the inner wall of heat pipe 4.

In practice, the tobacco product may be a cigarette or cartridge or the like, and the heating chamber 2 is constructed and arranged to removably receive a cigarette or cartridge, that is, a cigarette or cartridge may be inserted into the heating chamber 2 by a user and removed from the heating chamber 2 by the user after use. When the user smokes, generally the lateral part of holding shell 1 is operated, and in order to avoid scalding hands, the temperature of the lateral part of smoking set shell 1 should not be too high, and in this embodiment, the heat insulation structure with a special structure is arranged outside heating cavity 2, so as to achieve the purpose of preventing heat from being transferred to the lateral part of smoking set shell 1.

When the smoking set works to generate a large amount of heat, the phase change heat pipe 3 and the heat conduction pipe 4 absorb the heat emitted from the heating cavity 2, wherein one part of the heat absorbed by the phase change heat pipe 3 is transferred to the heat conduction pipe 4, and the other part of the heat is transferred to the end part of the heat conduction pipe and emitted from the end part; a part of the heat received by the heat conductive pipes 4 is transferred to the layered graphite sheet 5, and another part is transferred to and radiated from the end portions thereof; the heat that layered graphite piece 5 finally separates heat pipe 4 and transfer and comes is carried the heat that receives along layered structure extending direction of layered graphite piece 5 for can pierce through the very big reduction of heat of layered graphite piece 5, the very big reduction of heat that finally reachs the smoking set shell 1 lateral part, the scald hand problem that the too high temperature of shell 1 lateral part leads to has been avoided.

The heat insulation principle of the heat insulation structure of the present application will be explained in detail as follows:

as shown in fig. 3, in the housing 1, the heating chamber 2 is disposed in the heat pipe 4, and the heat pipe 4 and the heating chamber 2 are coaxially disposed, both ends of the heat pipe 4 and both ends of the heating chamber 2 are fixed on the housing 1, and the heat pipe 4 can be made of a material having a high thermal conductivity, such as an aluminum alloy or a copper alloy. Be equipped with a plurality of phase transition heat pipes 3 on heat pipe 4, phase transition heat pipe 3 keeps evenly distributed on the inner wall of heat pipe 4 to be equipped with stratiform graphite flake 5 on the outer wall of heat pipe 4, phase transition heat pipe 3 absorbs the heat that heats chamber 2 and distributes to heat pipe 4, and heat pipe 4 transmits its heat from heating chamber 2 absorption to stratiform graphite flake 5 jointly simultaneously, is guided to two tip of low temperature smoking set by stratiform graphite flake 5.

Referring to fig. 4, in an embodiment, be equipped with a plurality of draw-in grooves 6 on the inner wall of heat pipe 4, draw-in groove 6 extends along the length direction of heat pipe 4, and evenly distributed is on its inner wall, be equipped with phase change heat pipe 3 in every draw-in groove 6, the shape of draw-in groove 6 and phase change heat pipe 3's shape phase-match, make phase change heat pipe 3 can block inside draw-in groove 6, when the assembly, can stretch into heat pipe 4 with phase change heat pipe 3 earlier, make it aim at draw-in groove 6 on the heat pipe 4 inner wall, then apply suitable dynamics and press, make phase change heat pipe 3 block in draw-in groove 6 can.

When the low-temperature smoking set works, after the heating body 13 is heated, heat begins to diffuse to the periphery, because the heating cavity 2 is arranged in the heat conduction pipe 4, and the phase-change heat pipe 3 is arranged in the heat conduction pipe 4, by utilizing the excellent heat conduction performance of the phase-change heat pipe 3 and the heat conduction pipe 4, most of the heat (part for removing the heating low-temperature cigarettes) emitted by the heating cavity 2 is absorbed by the phase-change heat pipe 3, one part of the heat absorbed by the phase-change heat pipe 3 is transferred to the heat conduction pipe 4 and then transferred to the graphite flake 5 by the heat conduction pipe 4, and because of the special internal atomic structure of the graphite flake, the heat transferred to the graphite flake; one part is transmitted to the two ends of the phase change heat pipe 3, so as to achieve the purpose of guiding the heat to be emitted to the set direction.

Fig. 4 is the utility model provides a heat insulating elements's such as heating chamber outlying heat pipe 4 of low temperature smoking set's schematic diagram, as shown in the figure, the utility model provides a heat pipe 4 middle part is for both ends shrink, forms the excessive constriction 401 of sunken step, and in constriction 401 position, parcel multilayer stratiform graphite flake 5 so, when heat pipe 4 absorbed a large amount of heats, it can be with absorbed heat transfer to stratiform graphite flake 5 on, because the inside structure of graphite flake 5 is comparatively special, can be through graphite flake 5 with heat transfer to the position of settlement, see the following analysis for details.

Fig. 5 is a schematic view showing the internal structure and heat conduction of the graphite sheet 5 of the low temperature smoking set of the present invention, and as shown in the figure, each graphite sheet 5 is a laminated structure shown in the figure, namely, the bonding force between carbon atoms on each layer is very strong, the bonding density is very high and is far higher than the bonding force and the bonding density of the carbon atoms between the layers, as such, the laminated graphite sheet 5 is internally formed in a stacked state of a plurality of laminated structures, and when external heat is to pass through the laminated graphite sheet 5, as shown in the drawing, because the heat is blocked by the diffusion in the space between two adjacent layers, which is much weaker than the blocking of penetrating each layered structure layer by layer, the heat can be radiated along the extending direction of the layered structure, and finally most of the heat is transmitted to the edge position of the layered graphite sheet 5, and the heat penetrating the layered graphite belongs to a very small part through layer-by-layer blocking.

Fig. 6 is the heat dissipation schematic diagram of the layered graphite sheet 5 of the low temperature smoking set when applied in the low temperature smoking set, as shown in the figure, when the heat diffuses to the layered graphite sheet 5, at first a part of the heat moves under the separation of the graphite sheet 5 directly towards the edge of the graphite sheet 5, another part enters into the inside of the layered graphite sheet 5 (entering layer by layer), along the special structure inside the layered graphite sheet 5, further moves towards the edge of the graphite sheet 5, that is, the heat which can finally penetrate the layered graphite sheet 5 completely is very little. It should be explained here that, in order to improve the heat insulation performance, the heat pipe 4 is wrapped with a plurality of graphite sheets 5, and a certain gap is reserved between the heat pipe 4 and the heating chamber 2 to form an air heat insulation layer.

The working principle of the phase change heat pipe 3 will be described in detail below with reference to the specific structure thereof:

referring to fig. 7, it is conceivable that the phase-change heat pipe 3 includes a sealed pipe body 301 and a capillary structure layer 302 disposed adjacent to an inner wall of the pipe body 301, and the capillary structure layer 302 stores a phase-change liquid 303 therein. The phase change heat pipe 3 is divided into an evaporation section, a convection section and a condensation section which are connected in sequence, the evaporation section faces the heating cavity 2, and the condensation section is tightly attached to the inner wall of the heat conduction pipe 4. The phase change liquid 303 is absorbed by the capillary structure layer, and when the external temperature changes slightly, the phase change liquid 303 is attached to the capillary structure layer; when the external temperature rises, the internal temperature of the phase change heat pipe 3 is higher and higher until the phase change liquid 303 in the phase change heat pipe is vaporized to form steam, the steam flows to the area with low pressure under the action of air pressure and is liquefied to form the phase change liquid 303 in the area with low pressure, the phase change liquid 303 flows to the area generating the steam to form a cycle, a large amount of heat is absorbed and released in the process, and the heat conduction component with excellent effect is formed.

In the actual design, because of the different heat production of smoking set with different structures, the person skilled in the art can artificially control the boiling point and the condensation point to meet the heat transfer requirement of smoking set by adjusting the specific proportion of each substance component forming the phase change liquid.

Of course, the heat pipe without the capillary structure layer can be applied in the utility model, and the heat pipe can be selected according to the actual situation.

Fig. 8 is the utility model provides a low temperature smoking set is at heat flow schematic diagram in its inside phase change heat pipe 3 of during operation, as shown in the figure, when phase change heat pipe 3's part is heated, it receives the heat and spreads into, and the heat that spreads into phase change heat pipe 3 is along with the inside liquid vapour conversion of phase change heat pipe 3, is conveyed to the not heated position of phase change heat pipe 3 to along with vapour liquid conversion from phase change heat pipe 3 in the diffusion, form a route that the heat gived off.

Fig. 9 is a schematic view of vapor-liquid circulation in the phase change heat pipe 3 of the middle-low temperature smoking set during operation, as shown in fig. 8, when the local part of the phase change heat pipe 3 is heated, the heated part of the phase change heat pipe has heat transferred into, the liquid in this part of the phase change heat pipe 3 is heated and converted into steam, this region is an evaporation region (section) (the leftmost section in the direction shown in fig. 9), the pressure of the evaporation region becomes higher due to the generation of steam, the steam is squeezed to other regions, so that the steam flows, the region through which the steam flows is a convection region (section) (the middle section in the direction shown in fig. 9), the steam finally reaches another region (the rightmost section in the direction shown in fig. 9) of the phase change heat pipe 3 after passing through the convection region, this region is a condensation region (section), the temperature of the steam in the phase change heat pipe 3 drops after entering. As the liquid in the evaporation zone is changed into steam, negative pressure is formed at the capillary structure of the zone, the liquid in the capillary structure of the adjacent zone is sucked to the evaporation zone, and finally, a steam flow path from the evaporation zone to the convection zone and then to the condensation zone and a liquid flow path from the condensation zone to the convection zone and then to the evaporation zone are formed, so that a closed circulation is formed.

Fig. 10 is a schematic diagram of vapor-liquid circulation and heat flow in the phase change heat pipe 3 of the middle and low temperature smoking set of the present invention during operation, as shown in the figure, after heat enters the phase change heat pipe 3, the liquid at the corresponding position is caused to vaporize to form vapor, the pressure in the evaporation area increases, the vapor flows to the low pressure area, and reaches the condensation area with the lowest temperature through the convection area, and condenses in the condensation area to return to liquid, and the carried heat is released from the condensation area; the liquid in the capillary structure of the evaporation area is reduced to form negative pressure, so that the liquid in the convection area and the liquid in the condensation area flow to the evaporation area to form liquid-vapor circulation, and the phase-change heat pipe 3 can rapidly transfer heat in a required mode and direction in the circulation process.

Example 2

Referring to fig. 1, the difference from embodiment 1 is that two ends of a heating cavity 2 of the low-temperature smoking set of this embodiment are provided with openings, one of the openings is an air inlet end, the other opening is a tobacco insertion end, an air inlet 7 communicated with the air inlet end and a tobacco insertion port 8 communicated with the tobacco insertion end are respectively arranged on a housing 1, and the air inlet 7, the heating cavity 2 and the tobacco insertion port 8 are sequentially communicated to form a straight-through flue.

When the user needs the suction, insert the heating chamber 2 with cigarette from inserting cigarette mouth 8, the heating element in the heating chamber 2 heats the tobacco material in cigarette and in order to produce the smog that supplies the user's suction, for the person of facilitating the use suction, cigarette props up and sets up the tobacco material section and the filter tip section of connecting in order, the filter tip section stretches out from shell 1 at least part, the user is through holding the filter tip and leaking the part and sucking, outside cold air current gets into in the heating chamber 2 from air inlet 7, take the smog to the user in the mouth.

In the embodiment, the two ends of the heating cavity 2 are opened, one of the two ends is an air inlet end, the other end is a tobacco product insertion end, the shell 1 is respectively provided with an air inlet 7 communicated with the air inlet end and a tobacco product insertion port 8 communicated with the tobacco product insertion end, the air inlet 7, the heating cavity 2 and the tobacco insertion port 8 are sequentially communicated to form a straight-through flue, and heat transferred to the end parts of the layered graphite sheet 5, the heat conduction pipe 4 and the phase change heat pipe 3 is intensively transferred to the air inlet 7 and the tobacco insertion port 8 of the low-temperature smoking set to be dissipated, so that the temperature of the side part of the whole shell 1 of the low-temperature smoking set can be maintained in a.

In addition, after the external air flow enters the heating cavity 2 from the air inlet 7, the smoke generated by heating the tobacco products is brought into the mouth of the user from the cigarette inserting port 8 for being sucked; in the process of smoking of a user, when external cold airflow passes through the air inlet 7 and the smoke inserting port 8, a heat exchange process exists, so that heat intensively transferred to the smoke inserting port 8 and the air inlet 7 of the smoking set is transferred to the airflow and is quickly brought out of the smoking set, and the temperature of the end part of the smoking set can be effectively prevented from being too high; meanwhile, when the air flow passes through the air inlet 7, the heat transferred from the end part of the heat insulation structure can preheat the air flow, so that the purpose of saving energy can be achieved.

For effectively reducing the temperature of smog, improve and inhale and experience the sense, can also add the condensation segment between the cigarette material section of cigarette and filter tip section, the condensation segment can be designed into the expansion condensation structure.

It will be appreciated that when the tobacco product is a cartridge, the mouthpiece structure is required to be disposed at the insertion opening 8, but the smoking set with such a structure needs to be detached from the casing 1 to load the cartridge, which is inconvenient.

Referring to fig. 1, in an embodiment, a key 9 is provided on a housing 1 of the low temperature smoking set to control the low temperature smoking set to be turned on and off, and when the low temperature smoking set is used, a low temperature cigarette can be inserted into the low temperature smoking set through a cigarette insertion port 8 to be heated, so as to generate smoke for a user to smoke. Can also add the shield 10 that can shelter from or open inserting the mouth 8 at inserting mouth 8 department, when opening shield 10, insert mouth 8 and expose, can insert the use with low temperature cigarette from inserting mouth 8, when closing shield 10, can prevent to insert mouth 8 department and fall into the dust.

Referring to fig. 2, in the low-temperature smoking set of the embodiment, a battery 11, a PCB 12 and a heating element 13 are arranged in a housing 1, the battery 11 and the PCB 12 are electrically connected, and the PCB 12 and the heating element 13 are electrically connected, so that the battery 11 supplies power to the heating element 13 through the PCB 12, the heating element 13 is electrified to generate heat, and smoke generated after low-temperature cigarettes are heated is supplied to a user for smoking.

In this embodiment, the battery 11 and the PCB 12 are isolated from each other by a heat insulation structure, and the battery 11 and the PCB 12 have lower working temperatures, thereby preventing the battery 11 and the PCB 12 from being out of work due to the over-high internal temperature of the smoking set. In particular, when the PCB 12 partitions the case 1 into a battery mounting chamber in which the battery 11 is mounted and a heating element mounting chamber in which the heat insulating structure and the heating element are mounted, since the battery 11 and the heating element 13 are mounted in separate different mounting chambers, the influence of the heating heat of the heating element 13 on the battery 11 is further reduced.

As a preferred scheme, the heating element 13 in this embodiment adopts a tubular heating element 13, an inner cavity of the tubular heating element 13 directly forms the heating cavity 2, the tubular heating element 13 may include a heat conducting tube and a heating sheet attached to the periphery of the heat conducting tube, and heat generated by the heating sheet when the heating sheet is powered on is transferred to the tobacco product through the heat conducting tube. It can be understood that the heating sheet can also be arranged on the inner periphery of the heat conduction pipe body, the heat of the heating body in the structure can be directly transferred to the tobacco material without passing through the side wall of the heat conduction pipe body, so that the heating efficiency is higher, but the heating sheet directly faces the tobacco material, so that tar and other impurities are easily attached.

In practical application, the heating sheet can be further arranged into a plurality of heating sections with independent heating functions along the circumferential direction of the cross section of the heat conduction pipe body; the heating is carried out by the sub-sections, so that the condition that the same part of the tobacco product is burnt by heating for a long time is avoided, the use taste of a user is enhanced, the effective utilization rate of the tobacco product is improved, and the waste is reduced. Of course, the heating element 13 may be a rod-like or sheet-like heating element 13, and heating may be centered on the heating method.

Referring to fig. 3, two ends of the heating cavity 2 are respectively communicated with the cigarette inserting port 8 and the air inlet 7, and are communicated with the outside through the cigarette inserting port 8 and the air inlet 7, so that the air flow can enter the heating cavity 2 from the air inlet 7 and flow out from the cigarette inserting port 8. A dust cover 10 is arranged at the cigarette insertion opening 8 for opening or closing the cigarette insertion opening 8, and a cleaning cover 14 is arranged at the air inlet 7 for opening or closing the air inlet 7, so that the heating chamber 2 can be cleaned through the air inlet 7.

In the shell 1, the key 9 is electrically connected (or connected with other kinds of signals) with the PCB 12, and the shell 1 is further provided with a vibration prompting motor 15 which is controlled by the PCB 12, when a user controls the on-off of the low-temperature smoking set through the key 9, the PCB 12 sends a signal to the vibration prompting motor to enable the vibration prompting motor to work to generate vibration so as to prompt the user that corresponding operation is started. The utility model discloses in, vibrations suggestion motor 15 sets up under battery 11, and when not being restricted to this, can shake the concrete position of suggestion motor according to the selective arrangement of the concrete distribution of other spare parts in the shell 1.

The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.

Claims (11)

1. A thermal insulation structure, characterized in that: the phase-change heat pipe comprises a phase-change heat pipe, a heat conduction pipe and a graphite flake, wherein the graphite flake is coated on the outer wall of the heat conduction pipe, and the phase-change heat pipe is attached and fixed on the inner wall of the heat conduction pipe.

2. The thermal insulation structure according to claim 1, characterized in that: the inner wall of the heat conduction pipe is uniformly provided with clamping grooves extending along the axis direction of the heat conduction pipe, and the phase change heat pipe is installed in the clamping grooves in a matching manner.

3. The thermal insulation structure according to claim 1, characterized in that: the heat conduction pipe is wrapped by a plurality of layers of graphite sheets.

4. The thermal insulation structure according to claim 1, characterized in that: the phase change heat pipe comprises an evaporation section, a convection section and a condensation section which are connected in sequence, wherein the condensation section is tightly attached to the inner wall of the heat conduction pipe.

5. The thermal insulation structure according to claim 4, characterized in that: the phase change heat pipe comprises a closed pipe body and a capillary structure layer tightly attached to the inner wall of the pipe body, and phase change liquid is stored in the capillary structure layer.

6. The thermal insulation structure according to claim 1, characterized in that: the outer wall indent of heat pipe is formed with the recess, the graphite flake sets up in the recess.

7. A low temperature smoking set, its characterized in that: comprising a housing and the insulating structure of any one of claims 1 to 6, said housing having a heating chamber formed therein for loading and heating smoking material; the heat insulation structure is arranged in the shell and positioned at the periphery of the heating cavity, and the heat conduction pipe of the heat insulation structure is coaxially sleeved outside the heating cavity.

8. The low temperature smoking article of claim 7, wherein: openings are formed in two ends of the heating cavity, one opening end is an air inlet end, and the other opening end is a tobacco inserting end; the shell is respectively provided with an air inlet communicated with the air inlet end and a cigarette inserting port communicated with the cigarette material inserting end, and the air inlet, the heating cavity and the cigarette inserting port are sequentially communicated to form a straight-through type flue.

9. The low temperature smoking article of claim 8, wherein: the heating chamber is characterized in that a tubular heating body is arranged in the shell, and an inner cavity of the tubular heating body forms the heating chamber.

10. The low temperature smoking article of claim 9, wherein: still be equipped with the battery pack for the heat-generating body power supply in the shell, battery pack includes battery and PCB board, the PCB board will the shell is separated and is installed the battery installation cavity of battery with install the heating element installation cavity of thermal-insulated structure and heat-generating body.

11. The low temperature smoking article of claim 8, wherein: the shell is also provided with a dustproof cover which can shield the cigarette inserting port.

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