Accommodating piece and heating non-combustion device

Abstract

The utility model provides a containing part and a heating non-combustion device, and belongs to the technical field of electronic atomization, the containing part comprises a containing pipe body and a supporting part, the containing pipe body is of a hollow structure and is provided with a first end and a second end which are opposite in the inserting direction of an aerosol generating product, and the supporting part is connected to the second end; the supporting part and the containing pipe body jointly form a first containing bin used for containing an aerosol generating product, an inlet of the gas inlet channel is formed in the first end, an outlet of the gas inlet channel is formed in the second end, the gas inlet through hole is communicated with the first containing bin, and therefore gas entering the gas inlet channel enters the first containing bin through the gas inlet through hole, and therefore the aerosol generating product can be conveniently generated. According to the heating non-combustion device, the suction air channel required by the heating non-combustion device can be only formed in the containing part, if condensate is attached to the air inlet through hole and / or the air inlet channel to cause blockage, the containing part can be directly taken out of the heating non-combustion device to be cleaned, and the purpose of conveniently cleaning the suction air channel is achieved.

Description

Technical Field

[0001] This application relates to the technical field of electronic atomization, and particularly relates to a receiving member and a heat-not-burn device. Background Art

[0002] A heat-not-burn device is an electronic device that is used to heat an aerosol-generating article without burning the aerosol-generating article.

[0003] In related technologies, the aerosol generated after the aerosol-generating article is heated will spread along the suction airway of the heat-not-burn device, and the aerosol will condense to form condensate when it gets cold, so that the condensate adheres to the suction airway. If the condensate adhering to the suction airway is not cleaned in time, it is easy to occur the problem of blockage of the suction airway, affecting the user experience. Utility Model Content

[0004] This application provides a receiving member and a heat-not-burn device, aiming to achieve the purpose of facilitating the cleaning of the suction airway.

[0005] In a first aspect, this application provides a receiving member, which is arranged on a heat-not-burn device and is used for inserting an aerosol-generating article. The receiving member includes: a receiving tube body, the receiving tube body is a hollow structure, and the receiving tube body has opposite first and second ends along the direction in which the aerosol-generating article is inserted. The receiving tube body is provided with at least one air inlet channel, the inlet of the air inlet channel is located at the first end, and the outlet of the air inlet channel is located at the second end; a support portion, the support portion is connected to the second end, the support portion and the receiving tube body together form a first receiving chamber, the first receiving chamber is used for receiving the aerosol-generating article, the support portion is provided with at least one air inlet through hole, and the air inlet through hole is communicated with the first receiving chamber; wherein, the gas entering the air inlet channel enters the first receiving chamber through the air inlet through hole.

[0006] In an embodiment, the support portion and the receiving tube body also together form a second receiving chamber, the second receiving chamber faces away from the first receiving chamber, and the outlet of the air inlet channel is communicated with the air inlet through hole through the second receiving chamber.

[0007] In an embodiment, the support portion is further provided with a plugging through hole, and the plugging through hole is used for the heating component of the heat-not-burn device to pass through, so that the heating component extends into the first receiving chamber.

[0008] In an embodiment, the plugging through hole is coaxially arranged with the receiving tube body.

[0009] In one embodiment, the intake passage is a spiral intake passage or a straight-through intake passage; in the case where the intake passage is a spiral intake passage, at least a part of the intake passage forms an arc segment with a non-zero curvature along the extension path of the intake passage; in the case where the intake passage is a straight-through intake passage, the intake passage penetrates through the first end and the second end along a straight line.

[0010] In a second aspect, the present application further provides a heat-not-burn device, including: the receiving member according to any one of the foregoing embodiments; a heating assembly configured to heat the aerosol-generating article after being powered on to obtain an aerosol; a power supply assembly configured to supply electrical energy to the heating assembly; a main housing configured to form a receiving cavity, and the receiving member, the heating assembly, and the power supply assembly are all disposed in the receiving cavity; wherein, the main housing is provided with a first opening communicating with the first receiving chamber.

[0011] In one embodiment, the receiving member further includes a mounting portion disposed at the periphery of the first end, the mounting portion is mounted in the main housing, and the mounting portion is configured to limit the receiving member in the receiving cavity; along the direction in which the aerosol-generating article is inserted into the receiving tube body, the main housing has a guiding portion passing through the mounting portion and extending toward the first receiving chamber; wherein, the guiding portion defines the first opening.

[0012] In one embodiment, along the direction in which the aerosol-generating article is inserted into the receiving tube body, at least one limiting protrusion is formed by the guiding portion extending in the first opening; when the aerosol-generating article passes through the first opening and is inserted into the first receiving chamber, the limiting protrusion is configured to limit the shaking of the aerosol-generating article.

[0013] In one embodiment, the inner diameter of the guiding portion is greater than the inner diameter of the receiving tube body.

[0014] In one embodiment, a first annular inclined surface is formed at one end of the guiding portion close to the first end, a second annular inclined surface opposite to the first annular inclined surface is formed at the first end, the second annular inclined surface abuts against the first annular inclined surface, and an inlet of the intake passage is opened at the second annular inclined surface.

[0015] In the receiving member provided in the present application, the receiving member includes a receiving tube body and a support portion connected to the second end of the receiving tube body. The receiving tube body and the support portion jointly form a first receiving chamber for receiving an aerosol generating article. Moreover, the second end is disposed opposite to the first end of the receiving tube body. By providing at least one intake channel on the receiving tube body and at least one intake through-hole communicating with the first receiving chamber on the support portion, the inlet of the intake channel is located at the first end, and the outlet of the intake channel is located at the second end. Thus, external air flows from the first end through the intake duct to the second end, and then enters the first receiving chamber through the intake through-hole. In this way, the suction airway required for suction on the heat-not-burn device (i.e., the intake channel and the intake through-hole in the present application) can be provided only on the receiving member. If condensate adheres to the intake through-hole and / or the intake channel and causes blockage, the receiving member provided in the present application can be directly removed from the heat-not-burn device for cleaning, achieving the purpose of facilitating the cleaning of the airway. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the heat-not-burn device provided by an embodiment of the present application;

[0017] Figure 2 is Figure 1 a schematic cross-sectional view of the heat-not-burn device shown along the A-A' direction;

[0018] Figure 3 is Figure 1 a schematic diagram of the overall structure of the receiving member shown;

[0019] Figure 4 is Figure 3 a top view of the receiving member shown;

[0020] Figure 5 is Figure 4 a schematic cross-sectional view of the receiving member shown along the B-B' direction;

[0021] Figure 6 is Figure 4 another schematic cross-sectional view of the receiving member shown along the B-B' direction;

[0022] Figure 7 is a schematic diagram of the overall structure when the aerosol generating article is inserted into the heat-not-burn device;

[0023] Figure 8 is Figure 7 a schematic cross-sectional view of the aerosol generating article inserted into the heat-not-burn device and shown along the C-C' direction. Detailed Description of the Embodiment

[0024] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments are only used to explain the idea of the present invention and should not be construed as a limitation on the protection scope of the present application.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more unless otherwise specifically defined.

[0027] This embodiment provides a heat-not-burn device 100, in combination with Figure 1 and Figure 2 As shown, the heat-not-burn device 100 includes a receiving member 10, a heating assembly 20, a power supply assembly 30, and a main housing 40.

[0028] The power supply assembly 30 is configured to supply electrical energy to the heating assembly 20 so that the heating assembly 20 is powered on and in a working state.

[0029] The heating assembly 20 is configured to heat the aerosol-generating article after being powered on to obtain an aerosol.

[0030] The receiving member 10 is configured to receive the insertion of the aerosol-generating article so that the subsequent heating assembly 20 can heat the aerosol-generating article to obtain an aerosol. Among them, the receiving member 10 is formed with a first receiving chamber 102, and the first receiving chamber 102 is configured to receive the aerosol-generating article.

[0031] The main housing 40 is formed with a receiving cavity, and the receiving member 10, the heating assembly 20, and the power supply assembly 30 are all disposed in the receiving cavity. The main housing 40 is further provided with a first opening 43, and the first opening 43 is communicated with the first receiving chamber 102, so that the aerosol-generating article can pass through the first opening 43 and be inserted into the first receiving chamber 102.

[0032] Another embodiment of the present application further provides a receiving member 10, and the receiving member 10 is disposed on the heat-not-burn device 100 described in the embodiment of the present application, and the receiving member 10 is configured to receive the insertion of the aerosol-generating article. Please refer to Figures 3 to 5 It is worth mentioning that Figure 4 The top view of the receiving member 10 shown isFigure 3 The structure of the receiving member 10 as seen from the "upper" side to the "lower" side is shown. The receiving member 10 includes a receiving tube body 12 and a support portion 14.

[0033] As Figure 5 shown, the receiving tube body 12 has a hollow structure. The receiving tube body 12 has opposite first end 12a and second end 12b along the direction d1 in which the aerosol generating article is inserted, so that the first end 12a and the second end 12b of the receiving tube body 12 communicate with each other.

[0034] Moreover, an air intake passage 101 is formed on the receiving tube body 12. Please refer to Figures 3 to 5 . The inlet 101a of the air intake passage is located at the first end 12a, and the outlet of the air intake passage 101 is located at the second end 12b. Based on this, external air can flow out from the first end 12a of the receiving tube body 12 through the air intake passage 101 to the second end 12b of the receiving tube body 12.

[0035] Please continue to refer to Figure 5 . The support portion 14 is connected to the second end 12b, so that the support portion 14 seals the second end 12b of the receiving tube body 12. The support portion 14 and the receiving tube body 12 together form a first receiving chamber 102 for receiving the aerosol generating article. Moreover, the support portion 14 is also provided with an air intake through hole 141, and the air intake through hole 141 communicates with the first receiving chamber 102. Based on this, the air entering the air intake passage 101 flows out to the second end 12b of the receiving tube, and then enters the first receiving chamber 102 through the air intake through hole 141.

[0036] It is worth mentioning that the air entering the first receiving chamber 102 flows out of the receiving member 10 through the opening of the first receiving chamber 102. In this way, the suction airway required for sucking during the operation of the heat-not-burn device 100 can be formed only on the receiving member 10. If condensate adheres to and blocks the air intake through hole 141 and / or the air intake passage 101 of the receiving member 10, the receiving member 10 provided in the present application can be directly taken out from the heat-not-burn device 100, and the air intake passage 101 and the air intake through hole 141 of the receiving member 10 can be cleaned, so as to achieve the purpose of facilitating the cleaning of the suction airway of the heat-not-burn device 100.

[0037] Furthermore, in some other embodiments provided in the present application, as Figure 5 shown, the support portion 14 and the receiving tube body 12 also together form a second receiving chamber 104.

[0038] The second receiving chamber 104 faces away from the first receiving chamber 102. Specifically, the sealing portion is formed with opposite first and second sealing surfaces. The first sealing surface and the inner wall of the receiving tube body 12 together form the first receiving chamber 102, so that the opening of the first receiving chamber 102 is provided at the first end 12a of the receiving tube body 12. The second sealing surface and the inner wall of the receiving tube body 12 together form the second receiving chamber 104, so that the opening of the second receiving chamber 104 is provided at the second end 12b of the receiving tube body 12. That is to say, the opening of the first receiving chamber 102 faces away from the opening of the second receiving chamber 104.

[0039] Moreover, the outlet of the air inlet passage 101 communicates with the second receiving chamber 104, and the second receiving chamber 104 communicates with the air inlet through hole 141. In this way, when at least one air inlet passage 101 is provided on the receiving tube body 12, the air passing through the outlet of the air inlet passage 101 first converges in the second receiving chamber 104 and then flows into the first receiving chamber 102 through the air inlet through hole 141.

[0040] Furthermore, one air inlet passage 101 or a plurality of air inlet passages 101 are provided on the receiving tube body 12. When a plurality of air inlet passages 101 are provided on the tube body, the inlets 101a of the plurality of air inlet passages are provided along the circumferential direction of the receiving tube body 12 at the first end 12a, and the outlets of the plurality of air inlet passages 101 are provided along the circumferential direction of the receiving tube body 12 at the second end 12b. Further, in some embodiments, any two air inlet passages 101 are independent of each other, that is, any two air inlet passages 101 are not communicated with each other. In other embodiments, at least two of the plurality of air inlet passages 101 are communicated with each other.

[0041] Please continue to refer to Figures 3 to 5 , in some embodiments provided by the present application, the support portion 14 is further provided with a plugging through hole 143. The plugging through hole 143 is used for the heating assembly 20 of the heat-not-burn device 100 to pass through, so that the heating assembly 20 extends into the first receiving chamber 102. In this way, as Figures 7 to 8 shown, the heating assembly 20 extending into the first receiving chamber 102 can be in direct contact with the aerosol-generating article 200 received in the first receiving chamber 102, and the heating assembly 20 conducts heat energy to the aerosol-generating article 200, so that the aerosol-generating article 200 generates aerosol when heated.

[0042] Furthermore, in some embodiments provided by the present application, the plugging through hole 143 is coaxially arranged with the receiving tube body 12. In other words, the axis of the plugging through hole 143 coincides with the axis of the receiving tube body 12 in space. The purpose of such a setting is to make the heating assembly 20 extending into the first receiving chamber 102 partially inserted into the central area of the aerosol-generating article 200, which is beneficial to making the aerosol-generating article 200 heated evenly.

[0043] Further, in some embodiments provided by the present application, refer to Figure 5 , the intake channel 101 is a direct-current intake channel 1011. When the intake channel 101 is the direct-current intake channel 1011, the intake channel 101 penetrates through the first end 12a and the second end 12b of the receiving tube body 12 along a straight line.

[0044] In this way, from the inlet 101a of the intake channel to the outlet of the intake channel 101, the actual length of the intake channel 101 on its own extension path is equivalent to the shortest straight-line distance from the first end 12a to the second end 12b, which is beneficial for external air to quickly pass through the intake channel 101 and the intake through-hole 141 and then enter the first receiving chamber 102.

[0045] Further, in some embodiments provided by the present application, the extension direction of the direct-current intake channel 1011 is parallel to the axial direction of the receiving tube body 12.

[0046] In some other embodiments provided by the present application, refer to Figure 6 , the intake channel 101 is a spiral intake channel 1013. When the intake channel 101 is the spiral intake channel 1013, along the extension path of the intake channel 101, at least a part of the intake channel 101 is an arc segment with a non-zero curvature.

[0047] It is worth mentioning that at least a part of the intake channel 101 being an arc segment with a non-zero curvature means that along the extension direction of the intake channel 101, the intake channel 101 may have both an arc segment with a non-zero curvature and a straight segment with a zero curvature, or the intake channel 101 may only have an arc segment with a non-zero curvature and no straight segment.

[0048] Based on the setting of the spiral intake channel 1013, the contact area between the air and the spiral intake channel 1013 is increased. Thus, when the receiving member 10 has a certain heat conduction performance, the air located in the spiral intake channel 1013 can be preheated by the receiving member 10, so that the air has a certain amount of heat before entering the first receiving chamber 102, making the aerosol generating article be heated more fully.

[0049] Further, in some embodiments provided by the present application, the receiving member 10 further includes a mounting portion 16. As Figures 2 to 5 shown, the mounting portion 16 is provided at the periphery of the first end 12a, the mounting portion 16 is mounted in the main housing 40, and the mounting portion 16 is used to limit the receiving member 10 in the accommodating cavity of the main housing 40.

[0050] In this embodiment, based on the arrangement of the installation part 16, the accommodating part 10 can be detachably arranged on the heat-not-burn device 100. If the air inlet channel 101 or the air inlet through hole 141 on the accommodating part 10 is blocked, the accommodating part 10 can be pulled out, cleaned, and then reinstalled in the accommodating cavity so that the heat-not-burn device 100 can continue to be used, extending the service life of the heat-not-burn device 100.

[0051] Correspondingly, as Figure 2 shown, along the direction in which the aerosol-generating article is inserted into the first receiving chamber 102 (i.e., along the direction d1 in which the aerosol-generating article is inserted into the receiving tube body 12), the main housing 40 has a guiding part 42 that passes through the installation part 16 and extends towards the first receiving chamber 102, and the guiding part 42 defines a first opening 43 of the main housing 40.

[0052] Specifically, the guiding part 42 is inserted into the installation part 16, and along the axial direction of the guiding part 42, the aerosol-generating article passes through the first opening 43 and is inserted into the first receiving chamber 102.

[0053] Further, please continue to refer to Figure 2 , along the direction d1 in which the aerosol-generating article is inserted into the receiving tube body 12, at least one limiting protrusion 421 is formed by the guiding part 42 extending within the first opening 43. Further, when the aerosol-generating article passes through the first opening 43 and is inserted into the first receiving chamber 102, the limiting protrusion 421 is used to limit the shaking of the aerosol-generating article within the first receiving chamber 102.

[0054] Specifically, if the diameter of the aerosol-generating article is smaller than the diameter of the receiving tube body 12, then a part of the aerosol-generating article located in the first receiving chamber 102 may shake along the circumferential, radial, and axial directions of the receiving tube body 12. When the aerosol-generating article is inserted into the first receiving chamber 102, and when the limiting protrusion 421 forms an interference fit with the part of the aerosol-generating article located in the first opening 43, the limiting protrusion 421 can limit the shaking of the aerosol-generating article along the circumferential, radial, and axial directions of the receiving tube body 12, which is beneficial to improving the alignment accuracy between the aerosol-generating article passing through the first opening 43 and the heating component 20 inserted into the first receiving chamber 102.

[0055] It is worth mentioning that when the aerosol-generating article is inserted into the first receiving chamber 102, the limiting protrusion 421 and the part of the aerosol-generating article located in the first opening 43 can also form a clearance fit, so that the limiting protrusion 421 can limit the shaking of the aerosol-generating article along the axial and radial directions of the receiving tube body 12, which is beneficial to improving the alignment accuracy between the aerosol-generating article passing through the first opening 43 and the heating component 20 inserted into the first receiving chamber 102.

[0056] Please continue to refer to Figure 2 , in the case where there are multiple limiting protrusions 421, the multiple limiting protrusions 421 are arranged at intervals along the periphery of the first opening 43, so as to further improve the alignment accuracy between the aerosol-generating article passing through the first opening 43 and the heating component 20 inserted into the first receiving chamber 102.

[0057] Furthermore, please refer to Figure 7 and Figure 8 , in some embodiments provided by the present application, the inner diameter l1 of the guiding portion 42 is greater than the inner diameter l2 of the receiving tube body 12. In this way, when ensuring that the side wall of the aerosol-generating article 200 inserted into the first receiving chamber 102 is completely attached to the side wall of the first receiving chamber 102, the aerosol-generating article 200 located at the first opening 43 is in clearance fit with the guiding portion 42, so that the air located outside the main housing 40 enters the inlet 101a of the intake passage through the gap between the guiding portion 42 and the aerosol-generating article 200.

[0058] Furthermore, please continue to refer to Figure 8 , in some embodiments provided by the present application, a first annular inclined surface 422 is formed at one end of the guiding portion 42 close to the first end 12a, and a second annular inclined surface 122 opposite to the first annular inclined surface 422 is formed at the first end 12a of the receiving tube body 12, and the second annular inclined surface 122 abuts against the first annular inclined surface 422. And, the inlet 101a of the intake passage is opened on the second annular inclined surface 122. The fact that a second annular inclined surface 122 opposite to the first annular inclined surface 422 is formed at the first end 12a of the receiving tube body 12 means that the inclination direction of the second annular inclined surface 122 intersects with the inclination direction of the first annular inclined surface 422.

[0059] In the heat-not-burn device 100 provided in this embodiment, by forming the first annular inclined surface 422 on the guiding portion 42 and forming the second annular inclined surface 122 on the receiving tube body 12, the first annular inclined surface 422 and the second annular inclined surface 122 abutting against the first annular inclined surface 422 together form an annular passage, and this annular passage is in a conical structure in the longitudinal section of the heat-not-burn device 100. In this way, it is ensured that the arrangement of the guiding portion 42 does not block the inlet 101a of the intake passage located at the first end 12a, so as to ensure the smoothness of the air entering the intake passage 101 after the housing member 10 is installed in the accommodation cavity.

[0060] Of course, the present application can also have other various embodiments. Without departing from the spirit and essential points of the present application, those skilled in the art can make various corresponding changes and deformations according to the present application, but these corresponding changes and deformations should all fall within the protection scope of the claims attached to the present application.

Claims

1. A receiving member is provided on a heat-not-burn device for an aerosol-generating article to be inserted therein, characterized in that, The receiving element comprises: A receiving tube body (12), the receiving tube body (12) being a hollow structure, and the receiving tube body (12) having a first end (12a) and a second end (12b) opposite to each other along a direction (d1) of insertion of the aerosol generating article, the receiving tube body (12) being provided with at least one air inlet channel (101), the inlet (101a) of the air inlet channel (101) being located at the first end (12a), and the outlet (101b) of the air inlet channel (101) being located at the second end (12b); A support portion (14), the support portion (14) being connected to the second end (12b), the support portion (14) and the receiving tube body (12) jointly forming a first receiving chamber (102), the first receiving chamber (102) being used to receive the aerosol generating product, the support portion (14) being provided with at least one air inlet hole (141), the air inlet hole (141) being in communication with the first receiving chamber (102); wherein, The gas entering the air inlet channel (101) enters the first receiving chamber (102) through the air inlet hole (141).

2. The receiving member according to claim 1, wherein The support portion (14) and the receiving tube body (12) also jointly form a second receiving chamber (104), the second receiving chamber (104) being away from the first receiving chamber (102), and the outlet (101b) of the air intake channel (101) being connected to the air intake through hole (141) via the second receiving chamber (104).

3. The receiving member according to claim 1, wherein The support portion (14) is further provided with an insertion through hole (143), and the insertion through hole (143) is used for allowing the heating component (20) of the heat-without-combustion device (100) to pass through, so that the heating component (20) extends into the first receiving chamber (102).

4. The receiving member according to claim 3, wherein, The inserting through hole (143) and the receiving tube body (12) are coaxially arranged.

5. The receiving member according to claim 1, wherein The air intake channel (101) is a spiral air intake channel (1013) or a straight air intake channel (1011); When the air intake channel (101) is a spiral air intake channel (1013), along the extension path of the air intake channel (101), at least part of the air intake channel (101) is an arc segment with a non-zero curvature; When the air intake channel (101) is a straight air intake channel (1011), the air intake channel (101) passes through the first end (12a) and the second end (12b) in a straight line.

6. A heat-not-burn device, characterized in that, include: The receiving piece (10) according to any one of claims 1 to 5; A heating component (20), the heating component (20) being used to heat the aerosol generating product to obtain an aerosol after being powered on; A power supply component (30), the power supply component (30) being used to provide electrical energy to the heating component (20); A main shell (40), wherein the main shell (40) is structured to form a receiving cavity, wherein the receiving component (10), the heating component (20) and the power supply component (30) are all arranged in the receiving cavity; wherein: The main shell (40) is provided with a first opening (43) communicating with the first receiving chamber (102).

7. The heat-not-burn device according to claim 6, wherein The receiving member (10) further includes a mounting portion (16) provided at the periphery of the first end (12a). The mounting portion (16) is mounted within the main housing (40), and the mounting portion (16) is configured to limit the receiving member (10) within the accommodating cavity. Along the direction (d1) in which the aerosol-generating article is inserted into the receiving tube body (12), the main housing (40) has a guiding portion (42) that passes through the mounting portion (16) and extends towards the first receiving chamber (102); wherein, the guiding portion (42) defines the first opening (43).

8. The heat-not-burn device according to claim 7, wherein Along the direction (d1) in which the aerosol-generating article is inserted into the receiving tube body (12), at least one limiting protrusion (421) is formed by the guiding portion (42) extending within the first opening (43). When the aerosol-generating article passes through the first opening (43) and is inserted into the first receiving chamber (102), the limiting protrusion (421) is configured to limit the shaking of the aerosol-generating article.

9. The heat-not-burn device according to claim 7, wherein The inner diameter (l1) of the guiding portion (42) is larger than the inner diameter (l2) of the receiving tube body (12).

10. The heat-not-burn device according to claim 9, wherein One end of the guiding portion (42) close to the first end (12a) forms a first annular inclined surface (422), and the first end (12a) forms a second annular inclined surface (122) opposite to the first annular inclined surface (422). The second annular inclined surface (122) abuts against the first annular inclined surface (422), and the inlet (101a) of the air inlet channel (101) is opened on the second annular inclined surface (122).

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