A heating cigarette aerosol generating device

Abstract

The present invention discloses a heating cigarette aerosol generating device, which includes a heating structure, a wire, a first graphite structure and a second graphite structure. The first graphite structure and the second graphite structure are stacked so that air flow can enter the air flow channel of the first graphite structure through the second graphite structure. The first graphite structure also has a receiving cavity for accommodating the heating structure. The second graphite structure has a first end adjacent to the first graphite structure. One end of the wire is connected to the heating structure, and the other end of the wire passes through the edge of the first end of the second graphite structure to the outside, or the other end passes through the outside through a wire routing through hole on the second graphite structure that deviates from the central axis of the receiving cavity. Thereby, it is avoided that the wire is routed under the receiving cavity of the first graphite structure, reducing the adhesion of the diffused aerosol to the wire, thereby slowing down the carbon deposition under the receiving cavity of the first graphite structure, maintaining the smoothness of the entire air passage, and allowing the air flow to smoothly enter the air flow channel.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of heating appliances, and in particular, to a heating coil aerosol generating device. Background Art

[0002] During the use of smoking articles (such as cigarettes, cigars, etc.), tobacco is burned to generate tobacco smoke for people to inhale. During the burning process, while the smoking article volatilizes effective ingredients such as nicotine, it will also produce toxic and carcinogenic substances such as tar and carbon monoxide due to incomplete combustion and other reasons. These substances have been proven to be the main causes of health problems among smokers. Attempts have been made to provide alternatives to these tobacco-burning articles by producing products that release compounds such as nicotine without combustion to reduce the harm of smoking. An example of such a product is the so-called heat-not-burn product, which releases effective compounds such as nicotine by heating the smoking article rather than burning it. Since there is no combustion, the toxic and carcinogenic substances such as tar and carbon monoxide in the smoke will be greatly reduced.

[0003] An example of such a product is a heating device that releases compounds by heating rather than burning materials. It generates an aerosol for inhalation by heating the aerosol article.

[0004] In the prior art, during use, the aerosol generated after heating will diffuse throughout the heating device, and the heating structure needs to be connected to a power supply unit or other functional units through wires. The diffused aerosol will gradually adhere to the wires, and then carbonize and agglomerate, thus blocking the intake space, affecting the intake, and causing the entire heating device to malfunction. Summary of the Invention

[0005] The purpose of the present invention is to provide a heating coil aerosol generating device to solve the problems existing in the above background art.

[0006] To achieve the above purpose, the present application is implemented through the following technical solutions:

[0007] A heated aerosol generating device for cigarettes, comprising a heating structure, a wire, a first graphite structure and a second graphite structure; the first graphite structure includes a receiving cavity and an air flow channel; the second graphite structure includes a first end adjacent to the first graphite structure; the heating structure is disposed in the receiving cavity, and the heating structure can heat the air flow passing through the air flow channel by heat transfer through the first graphite structure; the first graphite structure and the second graphite structure are stacked, and the air flow can enter the air flow channel through the second graphite structure; one end of the wire is connected to the heating structure, and the other end passes to the outside of the second graphite structure through the edge of the first end, or the other end passes to the outside of the second graphite structure through a wire passing through hole on the second graphite structure, wherein the axis of the wire passing through hole is offset relative to the central axis of the receiving cavity.

[0008] In some embodiments, there is a gap between the first graphite structure and the second graphite structure.

[0009] In some embodiments, it further includes a wire passing notch for the wire to pass through; the first graphite structure includes a second end adjacent to the second graphite structure; the wire passing notch is disposed on the edge of the first end; and / or the wire passing notch is disposed on the edge of the second end.

[0010] In some embodiments, the first graphite structure includes a wire passing groove and a second end; the second end is adjacent to the second graphite structure; the wire passing groove is disposed at the second end, such that the wire can pass through the wire passing notch and be connected to the heating structure along the wire passing groove.

[0011] In some embodiments, the second graphite structure includes an air flow outlet; the receiving cavity is disposed in the central region of the first graphite structure; two or more of the air flow channels are arranged around the receiving cavity; the air flow outlet is disposed on the first end, adjacent to the first graphite structure; the air flow outlet covers the inlets of all the air flow channels and is in communication with the inlets of the air flow channels.

[0012] In some embodiments, it further includes a base; the base includes an annular wall surface, an axial air outlet through hole and a lateral air inlet through hole; the second graphite structure is located between the first graphite structure and the base; the annular wall surface has a hollow first cavity; the lateral air inlet through hole is disposed on the annular wall surface and is in communication with the first cavity, such that the air flow can enter the first cavity from the lateral air inlet through hole and then enter the second graphite structure through the axial air outlet through hole.

[0013] In some embodiments, the base further includes an axial air inlet through hole; the axial air inlet through hole is opposite to the axial air outlet through hole and communicates with the first cavity, so that air flow can enter the first cavity from the axial air inlet through hole and then enter the second graphite structure through the axial air outlet through hole.

[0014] In some embodiments, the second graphite structure further includes a third end portion; the third end portion is adjacent to the base; there is a gap between the third end portions, so that air flow can directly enter the second graphite structure from the gap.

[0015] In some embodiments, a fixing member is further included; the fixing member movably connects the first graphite structure and the second graphite structure together.

[0016] In some embodiments, a ring-shaped tube is further included; the fixing member includes a first clamping portion, a second clamping portion and an axial limiting member; the first clamping portion and the second clamping portion jointly clamp the first graphite structure and the second graphite structure; the ring-shaped tube is sleeved on the fixing member, so that the first clamping portion and the second clamping portion cooperate to limit the radial position of the second graphite structure relative to the first graphite structure; the axial limiting member is fixed to the first clamping portion and / or the second clamping portion and abuts against the end portion of the second graphite structure, so as to limit the axial position of the second graphite structure relative to the first graphite structure.

[0017] In some embodiments, the fixing member further includes an extended support leg; the extended support leg extends from the first clamping portion and / or the second clamping portion and abuts against the base, so as to form a gap for air flow to pass through between the base and the second graphite structure.

[0018] In some embodiments, a temperature measuring element is further included; the second graphite structure includes a pedestal and a side wall; the side wall extends from the pedestal towards the first graphite structure, and a second cavity is formed between the side wall and the pedestal; the temperature measuring element is arranged on the pedestal, and the probe portion of the temperature measuring element faces the first graphite structure.

[0019] An embodiment of the present application provides an aerosol generating device, which includes a heating structure, a wire, a first graphite structure, and a second graphite structure. The first graphite structure and the second graphite structure are stacked such that air can enter the air flow channel of the first graphite structure through the second graphite structure. The first graphite structure also has a receiving cavity for accommodating the heating structure. One end of the wire is connected to the heating structure. The other end of the wire passes through the edge of the end of the second graphite structure to the outside, or the other end passes through a wire routing through hole on the second graphite structure that is offset from the central axis of the receiving cavity to the outside. Thus, it is avoided that the wire routes under the receiving cavity of the first graphite structure, reducing the adhesion of diffused aerosol to the wire, thereby slowing down the carbon deposition under the receiving cavity of the first graphite structure, keeping the entire air passage unobstructed, and allowing air to smoothly enter the air flow channel. Description of the Drawings

[0020] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0021] Figure 1 It is a schematic structural diagram of an aerosol generating device provided by an embodiment of the present application, where the cigarette rod is in an inserted state.

[0022] Figure 2 It is a schematic structural diagram of an aerosol generating device provided by an embodiment of the present application, where the cigarette rod is in a removed state.

[0023] Figure 3 It is a cross-sectional view of an aerosol generating device provided by an embodiment of the present application, where the wire passes through the edge of the end of the second graphite structure to the outside.

[0024] Figure 4 is Figure 3 A partial enlarged schematic view of part A of

[0025] Figure 5 It is an exploded view of a fixing member, a first graphite structure, a second graphite structure, and a base provided by an embodiment of the present application.

[0026] Figure 6 It is an exploded view of a fixing member, a first graphite structure, a second graphite structure, and a base provided by an embodiment of the present application.

[0027] Figure 7 It is a cross-sectional view of an aerosol generating device provided by an embodiment of the present application, where the second graphite structure has a wire routing through hole for the wire to pass through.

[0028] Figure 8 is Figure 7Partial enlarged schematic view at position B.

[0029] Figure 9 It is a cross-sectional view of an aerosol generating device provided by an embodiment of the present application, in which there is a gap for a wire to pass through between the first graphite structure and the second graphite structure.

[0030] Figure 10 Is Figure 9 Partial enlarged schematic view at position C.

[0031] The reference numerals are as follows:

[0032] 100, cigarette; 200, housing; 30, heating structure; 40, first graphite structure; 41, accommodation cavity; 42, air flow channel; 43, wire groove; 50, second graphite structure; 51, pedestal; 511, air flow outlet; 512, air flow inlet; 52, side wall; 521, through hole; 53, temperature measuring element; 54, wire through hole; 60, base; 61, annular wall surface; 62, lateral air intake through hole; 63, axial air outlet through hole; 64, axial air intake through hole; 70, fixing member; 71, first clamping portion; 72, second clamping portion; 73, axial limiting member; 80, annular tube; 81, fixing protrusion; 90, wire. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0034] The terms "first", "second", and "third" in the present application are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity or order of the indicated technical features. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative position relationship or movement situation between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0035] Reference to "embodiment" in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element, or there may be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0037] Please refer to Figures 1-10 , an aerosol generating device according to an embodiment of the present application includes a heating structure 30, a wire 90, a first graphite structure 40, and a second graphite structure 50. The heating structure 30 is disposed in the accommodation cavity 41 of the first graphite structure 40 to heat the first graphite structure 40, and then the heat is transferred from the first graphite structure 40 to the air flow channel 42 provided in the first graphite structure 40. When the air flow passes through the air flow channel 42, the air flow can be heated into a high-temperature air flow, and the high-temperature air flow can heat the aerosol generating article to generate an aerosol for inhalation. The heating structure 30 can be connected to a power supply unit or other functional units through the wire 90. The wire 90 is routed from the outside of the second graphite structure 50 to the heating structure 30. Compared with other routing methods such as central routing, the wire 90 routed from the outside of the first graphite structure 40 can reduce the adhesion of the diffused aerosol to it because the wire 90 does not pass under the accommodation cavity 41 of the first graphite structure 40, thereby slowing down carbon deposition, and thus slowing down the situation where the intake space is blocked due to carbon deposition. The expected service life of the aerosol generating device according to the embodiment of the present application can be extended.

[0038] Specifically, please refer to Figure 3 and Figure 4 In the embodiment of, one end of the wire is connected to the heating structure, and the other end passes through the edge of the first end of the second graphite structure 50 adjacent to the first graphite structure 40 to the outside of the second graphite structure. That is to say, the wire is routed from between the first graphite structure 40 and the second graphite structure 50 to the outside. Or please refer to Figure 7 and Figure 8In an embodiment, one end of the wire 90 is connected to the heating structure, and the other end passes through the routing through-hole 54 on the second graphite structure 50 to the outside of the second graphite structure 50, where the axis of the routing through-hole 54 deviates from the central axis of the accommodation cavity 41. Since the routing through-hole 54 deviates from the central axis of the accommodation cavity 41, the wire 90 will not route under the first graphite structure 40. This avoids the wire 90 routing under the first graphite structure 40 during use, which may affect the smoothness of the inlet of the air flow channel 42. Because if it routes below, the wire 90 located below the accommodation cavity will accumulate carbon and form lumps after adhering to the aerosol, thus blocking the inlet of the air flow channel 42. Secondly, the wire 90 located in the lower cavity is also more likely to adhere to the aerosol than the wire 90 routing on the outside, exacerbating the carbon accumulation situation.

[0039] In some embodiments, refer to Figures 3-6 , through-holes 521 for limiting are provided on the first graphite structure 40 and / or the second graphite structure 50. The through-holes 521 can limit the wire 90 to a certain extent, enabling the wire 90 to route outside the first graphite structure 40 rather than under it. The through-holes 521 can be provided on the side wall 52 of the first graphite structure 40, or on the first end edge of the second graphite structure 50 adjacent to the first graphite structure 40. The through-holes 521 can also be provided on the side wall 52 of the first graphite structure 40 and the first end edge simultaneously, as long as the through-holes 521 on the two graphite structures can align when the first graphite structure 40 and the second graphite structure 50 are stacked.

[0040] In some embodiments, refer to Figure 9 and Figure 10 , there is a gap between the first graphite structure 40 and the second graphite structure 50 through which the wire 90 can pass. One end of the wire is connected to the heating structure, and the other end passes through the gap and exits from the edge position of the first end of the second graphite structure 50.

[0041] In some embodiments, refer to Figure 6 , a routing groove 43 is provided at the second end of the first graphite structure 40 close to the second graphite structure 50. The wire 90 can pass through the routing notch and be connected to the heating structure 30 along the routing groove 43. The routing groove 43 can limit the wire 90. At the same time, since the wire 90 is located in the routing groove 43, the contact area between the wire 90 and the aerosol is reduced, thereby further slowing down the adhesion of the aerosol to the wire 90.

[0042] In some embodiments, refer to Figure 3 , 4As shown in FIGS. 5 and 6, the accommodation cavity 41 is provided in the central region of the first graphite structure 40, and two or more gas flow channels 42 are arranged around the accommodation cavity 41. The heating structure 30 located in the accommodation cavity 41 can heat the gas flowing through the gas flow channels 42 through the first graphite structure 40. When the first graphite structure 40 and the second graphite structure 50 are stacked, the gas flow outlet 511 of the second graphite structure 50 is provided adjacent to the first end of the first graphite structure 40. The gas flow outlet 511 can cover the inlets of all the gas flow channels 42 and communicate with the gas flow channels 42, so that the inlets of the gas flow channels 42 will not be blocked by the second graphite structure 50, ensuring smooth gas flow.

[0043] In some embodiments, referring to Figures 3-6 , a base 60 is further included. The base 60 includes an annular wall surface 61, an axial gas outlet through hole 63, and a lateral gas inlet through hole 62. The annular wall surface 61 has a hollow first cavity, and the lateral gas inlet through hole 62 is provided on the annular wall surface 61 and communicates with the first cavity. The axial gas outlet through hole 63 is adjacent to the third end of the second graphite structure 50. The gas can enter the first cavity from the lateral gas inlet through hole 62 and then enter the second graphite structure 50 through the axial gas outlet through hole 63, and then enter the first graphite structure 40 from the gas flow outlet at the first end of the second graphite structure 50. This passage route can serve as the first intake gas flow channel 42.

[0044] In some embodiments, referring to Figure 5 and 6 , the lateral gas inlet through hole 62 is vertically strip-shaped and extends along the axial direction of the second graphite structure 50. The vertically strip-shaped lateral gas inlet through hole 62 can further slow down the accumulation of carbon deposition. Due to the self-gravity of the carbon deposition block and other reasons, the carbon deposition at the bottom of the lateral gas inlet through hole 62 is more serious than that at the top of the lateral gas inlet through hole 62. By arranging the vertically strip-shaped lateral gas inlet through hole 62, more ventilation space can be allowed in the axial direction. Even if the bottom of the lateral gas inlet through hole 62 is blocked by carbon deposition, its top can still remain unobstructed.

[0045] In some embodiments, referring to Figures 3-6 , the base 60 further includes an axial gas inlet through hole 64 opposite to the axial gas outlet through hole 63, and the axial gas inlet through hole 64 communicates with the first cavity. The gas can enter the first cavity from the axial gas inlet through hole 64 and then enter the gas flow inlet 512 at the third end of the second graphite structure 50 through the axial gas outlet through hole 63. This passage route can serve as the second intake gas flow channel 42.

[0046] In some embodiments, referring to Figure 4, the second graphite structure 50 is disposed between the first graphite structure 40 and the base 60. There is a gap at the third end between the base 60 and the second graphite structure 50, and the air flow can also directly enter the second graphite structure 50 from this gap. This passage route can be used as the third intake air flow channel 42.

[0047] In some embodiments, referring to Figures 3-6 , the first graphite structure 40 and the second graphite structure 50 are movably connected together by a fixing member 70.

[0048] In some embodiments, referring to Figures 3-6 , the first clamping portion 71 and the second clamping portion 72 of the fixing member 70 jointly clamp the first graphite structure 40 and the second graphite structure 50. An axial limiting member 73 is also provided on the fixing member 70, and the axial limiting member 73 abuts against the third end of the second graphite structure 50, thereby restricting the axial position of the second graphite structure 50 relative to the first graphite structure 40. The axial limiting member 73 can be only located on the first graphite structure 40 or the second graphite structure 50, or can be located on both the first graphite structure 40 and the second graphite structure 50. Figures 5-6 The illustrated embodiment is an embodiment in which two limiting members are respectively located on the first graphite structure 40 and the second graphite structure 50. After the first clamping portion 71 and the second clamping portion 72 jointly clamp the first graphite structure 40 and the second graphite structure 50, the fixing member 70 together with the first graphite structure 40 and the second graphite structure 50 is sleeved by an annular tube 80, so that the first clamping portion 71 and the second clamping portion 72 cooperate to limit the radial position of the second graphite structure 50 relative to the first graphite structure 40.

[0049] In some embodiments, the fixing member 70 further includes extended support feet that extend from the first clamping portion 71 and / or the second clamping portion 72 and abut against the base 60, thereby forming a gap for the air flow to pass through between the base 60 and the second graphite structure 50. The extended support feet can extend from the first clamping portion 71 or the second clamping portion 72, or can both extend from the first clamping portion 71 or the second clamping portion 72. Figures 5-6 The illustrated embodiment is an embodiment in which two extended support feet extend from the first clamping portion 71 and the second clamping portion 72 respectively.

[0050] In some embodiments, such as Figure 5As shown, it further includes a temperature measuring element 53, which is arranged on the second graphite structure 50. Specifically, the second graphite structure 50 includes a pedestal 51, and a side wall 52 extends from the pedestal 51 towards the first graphite structure 40, and a second cavity through which air can flow is formed between the pedestal 51 and the side wall 52. The temperature measuring element 53 is arranged on the pedestal 51, and its probe part faces the first graphite structure 40. In this way, when the user sucks, the air flow flows from the second cavity of the second graphite structure 50 into the air flow channel 42 of the first graphite structure 40. At this time, due to the flow of the air flow, the temperature of the newly inhaled air flow is relatively low, and the temperature detected by the probe part of the temperature measuring element 53 will change greatly, so that the number of sucking times can be detected. The temperature measuring element 53 includes but is not limited to a thermocouple.

[0051] In some embodiments, please refer to Figure 4 , the annular tube 80 includes a fixing protrusion. The fixing protrusion 81 protrudes inwards from the inner wall surface of the annular tube 80, dividing the accommodating cavity of the annular tube 80 into a first cavity and a second cavity. The first cavity can be used to accommodate an aerosol generating article, such as a cigarette 100. The fixing member 70, the first graphite structure 40 and the second graphite structure 50 are located in the second cavity. During installation, the end face of the fixing member 70 abuts against the fixing protrusion 81.

[0052] It should be noted that the description and drawings of the present application give preferred embodiments of the present application, but are not limited to the embodiments described in this specification. Further, for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present application.

Claims

1. A heating cigarette aerosol generating device, characterized in that, It includes a heating structure, a wire, a first graphite structure, and a second graphite structure; the first graphite structure includes a receiving cavity and an air flow channel; the second graphite structure includes a first end adjacent to the first graphite structure; The heating structure is disposed in the receiving cavity, and the heating structure heats the air flow passing through the air flow channel by heat transfer through the first graphite structure; The first graphite structure and the second graphite structure are stacked, and the air flow enters the air flow channel through the second graphite structure; One end of the wire is connected to the heating structure, and the other end passes to the outside of the second graphite structure through the edge of the first end, or the other end passes to the outside of the second graphite structure through a wire routing through hole on the second graphite structure, wherein the axis of the wire routing through hole is offset relative to the central axis of the receiving cavity; There is a gap between the first graphite structure and the second graphite structure; It further includes a wire routing notch for the wire to pass through; the first graphite structure includes a second end adjacent to the second graphite structure; The wire routing notch is disposed on the edge of the first end; and / or The wire routing notch is disposed on the edge of the second end; The first graphite structure includes a wire routing groove, and the wire routing groove is disposed at the second end, so that the wire passes through the wire routing notch and is connected to the heating structure along the wire routing groove.

2. The aerosol generating device for heating roll tobacco according to claim 1, wherein, The second graphite structure includes an air flow outlet; The receiving cavity is disposed in the central region of the first graphite structure; Two or more of the air flow channels are arranged around the receiving cavity; The air flow outlet is disposed on the first end, adjacent to the first graphite structure; The air flow outlet covers the inlets of all the air flow channels and is in communication with the inlets of the air flow channels.

3. The heating coil aerosol generating device according to claim 1, wherein It further includes a base; the base includes an annular wall surface, an axial air outlet through hole, and a lateral air inlet through hole; The second graphite structure is located between the first graphite structure and the base; The annular wall surface has a hollow first cavity; The lateral air inlet through hole is disposed on the annular wall surface and is in communication with the first cavity, so that the air flow can enter the first cavity from the lateral air inlet through hole and then enter the second graphite structure through the axial air outlet through hole.

4. The heating coil aerosol generating device according to claim 3, characterized in that, The base further includes an axial air inlet through hole; The axial air inlet through hole is opposite to the axial air outlet through hole and is in communication with the first cavity, so that the air flow can enter the first cavity from the axial air inlet through hole and then enter the second graphite structure through the axial air outlet through hole.

5. The heated coil aerosol generating device according to claim 3, characterized in that, The second graphite structure further includes a third end; The third end is adjacent to the base; There is a gap between the base and the third end, so that the air flow can directly enter the second graphite structure from the gap.

6. The heated roll aerosol generating device according to any one of claims 3-5, characterized in that, It further includes a fixing member; The fixing member movably connects the first graphite structure and the second graphite structure together.

7. The heated roll aerosol generating device according to claim 6, wherein The fixing member includes a first clamping portion, a second clamping portion, and an axial limiting member; The first clamping portion and the second clamping portion jointly clamp the first graphite structure and the second graphite structure; It further includes an annular tube which is sleeved on the fixing member, so that the first clamping portion and the second clamping portion cooperate to limit the radial position of the second graphite structure relative to the first graphite structure; The axial limiting member is fixed to the first clamping portion and / or the second clamping portion and abuts against the second graphite structure, so as to limit the axial position of the second graphite structure relative to the first graphite structure.

8. The heated roll aerosol generating device according to claim 7, wherein The fixing member further includes an extended support leg; The extended support leg extends from the first clamping portion and / or the second clamping portion and abuts against the base, so as to form a gap for air flow between the base and the second graphite structure.

9. The heated roll aerosol generating device according to any one of claims 1-5, characterized in that, The second graphite structure includes a pedestal and a side wall; The side wall extends from the pedestal towards the first graphite structure, and a second cavity is formed between the side wall and the pedestal; It further includes a temperature measuring element; The temperature measuring element is arranged on the pedestal, and the probe portion of the temperature measuring element faces the first graphite structure.

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