Fan head and bladeless fan

Abstract

The application provides a fan head and a bladeless fan, wherein the fan head comprises: an inner shell, the inner shell comprising a shell body, the shell body having an air outlet air duct and an air outlet communicating with the air outlet air duct; a protective shell, the protective shell comprising an outer shell and a flow guide fin arranged on the outer shell, the outer shell being connected with the shell body and covering the outer surface of one side of the inner shell, the flow guide fin penetrating into the air outlet air duct from the shell body, and the flow guide fin guiding the air blown out from the air outlet air duct. The application sets the flow guide fin on the outer shell, ensures that the flow guide fin has a long enough length without being limited by the manufacture of the inner shell, and the length of the flow guide fin can meet the actual air guiding requirement; the flow guide fin is matched with the air outlet of the inner shell to form a penetrating type flow guide structure, compared with the common flow guide fin integrated with the inner shell, the application realizes efficient air blowing of the air outlet of the fan head and improves the use experience of the user.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and more specifically, to a fan head and a bladeless fan. Background Technology

[0002] Currently available bladeless fans typically have a one-piece molded structure for the airflow guide vanes near the air outlet and the inner casing. Due to limitations in mold manufacturing and the difficulty in molding at the air outlet, the airflow guide vanes on the inner casing cannot be too long. Otherwise, it may cause uneven thickness of the one-piece molded parts, resulting in poor surface finish. If the airflow guide vanes are not long enough, the internal airflow will not be effectively guided forward after passing through the air outlet, causing the air to diffuse in other directions, resulting in a poor user experience. Summary of the Invention

[0003] This invention provides a fan head and a bladeless fan to solve the problem of insufficient length of the airflow deflector in the prior art.

[0004] To address the aforementioned problems, according to one aspect of the present invention, a fan head is provided, comprising: an inner shell, the inner shell including a housing, the housing having an air outlet duct and an air outlet communicating with the air outlet duct; and a protective shell, the protective shell including an outer shell and a guide vane disposed on the outer shell, the outer shell and the housing being connected, the outer shell covering the outer surface of one side of the inner shell, the guide vane penetrating from the housing into the air outlet duct, and the guide vane guiding the air blown out from the air outlet duct.

[0005] Furthermore, the side wall of the housing is provided with multiple mounting holes spaced apart, and the outer shell is provided with multiple air-guiding vanes spaced apart. The multiple air-guiding vanes are inserted into the air outlet duct through the multiple mounting holes one by one.

[0006] Furthermore, the protective shell also includes multiple reinforcing ribs, with the two ends of the reinforcing ribs connected to the drainage fins and the outer shell, respectively; the drainage fins have two opposing drainage surfaces, and the multiple reinforcing ribs are spaced apart on the two drainage surfaces.

[0007] Furthermore, in the depth direction of the mounting hole, the size of the reinforcing rib is less than or equal to the size of the mounting hole.

[0008] Furthermore, the inner shell also includes fixed winglets fixed inside the shell. The fixed winglets are located at the air outlet, with one end of the guide winglet and the end of the fixed winglet facing into the air outlet duct connected together. The guide winglet and the fixed winglet together guide the air blown out from the air outlet duct.

[0009] Furthermore, the length of the fixed wing is in the range of 4-6 mm, and the length of the drainage wing is in the range of 13-15 mm.

[0010] Furthermore, the length of the fixed wing is 5mm, and the length of the drainage wing is 14mm.

[0011] Furthermore, the fixed vane has a guiding surface, the flow-guiding vane has a flow-guiding surface, one edge of the guiding surface and one edge of the flow-guiding surface are joined together, the guiding surface and the flow-guiding surface are coplanar, or the guiding surface is inclined relative to the flow-guiding surface.

[0012] Furthermore, the housing includes opposing first and second sidewalls, with the air outlet duct and air outlet located between the first and second sidewalls. The outer shell is connected to the first sidewall, and the air guide vanes pass through the first sidewall into the air outlet duct and abut against the second sidewall.

[0013] Furthermore, the inner diameter of the mounting hole at the end closer to the air outlet duct is smaller than the inner diameter at the end farther from the air outlet duct.

[0014] Furthermore, the inner shell has a slot, and the protective shell also includes a protrusion, which is disposed on the outer shell and engages with the slot.

[0015] Furthermore, there are multiple protrusions, which are spaced apart on the periphery of the outer shell, and multiple slots, which are correspondingly engaged with the multiple protrusions.

[0016] Furthermore, the fan head also includes a connecting shell, and there are two inner shells. The two inner shells are arranged opposite each other and are both connected to the connecting shell. The connecting shell and the two inner shells form an integral injection molded structure. The protective shell is an integral injection molded structure, and there are two protective shells. The two protective shells are respectively set on the two inner shells.

[0017] According to another aspect of the present invention, a bladeless fan is provided, comprising the fan head described above.

[0018] Furthermore, the bladeless fan also includes a flow divider cone, which includes a front flow divider cone and a rear flow divider cone, which are installed correspondingly. The interior of the flow divider cone has a main air duct, a first air duct, and a second air duct. The first air duct and the second air duct are respectively connected to the main air duct. The first air duct is connected to the air outlet duct of one inner shell, and the second air duct is connected to the air outlet duct of another inner shell.

[0019] Applying the technical solution of this invention, a fan head is provided, comprising: an inner shell, the inner shell including a outer shell, the outer shell having an air outlet duct and an air outlet communicating with the air outlet duct; a protective shell, the protective shell including an outer shell and a guide vane disposed on the outer shell, the outer shell and the outer shell being connected, the outer shell covering one side of the outer surface of the inner shell, the guide vane penetrating from the outer shell into the air outlet duct, and the guide vane guiding the air blown out from the air outlet duct. This invention, by setting the guide vane on the outer shell, compared to the common integrated structure of the guide vane and inner shell, ensures that the guide vane has a sufficiently long length, not limited by the manufacturing of the inner shell, and the length of the guide vane meets the actual air guiding requirements; by cooperating with the air outlet of the inner shell to form a through-type air guiding structure, since the guide vane can be made relatively long, this invention has a better air guiding effect on the air blown out from the air outlet of the fan head, allowing the air to be blown further or accurately in the desired direction, achieving efficient air blowing from the fan head air outlet and improving the user experience. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 An exploded view of a portion of the structure of a bladeless fan provided in an embodiment of the present invention is shown;

[0022] Figure 2 A cross-sectional view of a bladeless fan provided by an embodiment of the present invention is shown from a top view.

[0023] Figure 3 A schematic diagram of the specific structure of the inner shell provided in an embodiment of the present invention is shown;

[0024] Figure 4 A schematic diagram of the specific structure of the protective shell provided in an embodiment of the present invention is shown;

[0025] Figure 5 It shows Figure 4 Enlarged view of a portion of the inner protective shell;

[0026] Figure 6 A schematic diagram of the external structure of a bladeless fan provided in an embodiment of the present invention is shown;

[0027] Figure 7 A schematic diagram illustrating the working principle of a bladeless fan provided in an embodiment of the present invention is shown.

[0028] Figure 8 The illustration shows an airflow simulation cloud map obtained by using the fluid simulation software provided in an embodiment of the present invention to simulate a bladeless fan with a fan head proposed in the present invention.

[0029] Figure 9 The illustration shows an airflow simulation cloud map obtained by simulating a common bladeless fan using the fluid simulation software provided in an embodiment of the present invention.

[0030] The above figures include the following reference numerals:

[0031] 10. Inner shell; 11. Outer shell; 111. Air outlet duct; 112. Air outlet; 113. Mounting hole; 114. First side wall; 115. Second side wall; 12. Fixing vane; 121. Air guide surface; 13. Slot;

[0032] 20. Protective shell; 21. Outer shell; 22. Drainage vane; 221. Drainage surface; 23. Reinforcing rib; 24. Protrusion;

[0033] 30. Connecting shell;

[0034] 40. Flow divider cone; 41. Front flow divider cone; 42. Rear flow divider cone. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1 to 7 As shown, an embodiment of the present invention provides a fan head, including: an inner shell 10, the inner shell 10 including a shell 11, the shell 11 having an air outlet duct 111 and an air outlet 112 communicating with the air outlet duct 111; a protective shell 20, the protective shell 20 including an outer shell 21 and a guide vane 22 disposed on the outer shell 21, the outer shell 21 and the shell 11 being connected, the outer shell 21 covering the outer surface of one side of the inner shell 10, the guide vane 22 penetrating from the shell 11 into the air outlet duct 111, and the guide vane 22 guiding the air blown out from the air outlet duct 111.

[0037] This invention provides a guide vane 22 on the outer shell 21, ensuring that the guide vane 22 is not limited by the manufacturing of the inner shell 10 and has a sufficiently long length, and that the length of the guide vane 22 meets the actual air guiding requirements. The guide vane 22 is combined with the air outlet 112 of the inner shell 10 to form a through-type air guiding structure. Since the guide vane 22 can be made relatively long, this invention has a better air guiding effect on the air blown from the fan head air outlet 112, allowing the air to be blown further or accurately in the required direction, achieving efficient air blowing from the fan head air outlet 112 and improving the user experience.

[0038] like Figure 1 , Figure 3 and Figure 4 As shown, the side wall of the housing 11 is provided with a plurality of mounting holes 113 spaced apart, and the outer shell 21 is provided with a plurality of air-guiding vanes 22 spaced apart. The plurality of air-guiding vanes 22 are inserted into the air outlet duct 111 through the plurality of mounting holes 113 in a corresponding manner. By setting the plurality of air-guiding vanes 22 to cooperate with the plurality of mounting holes 113, the air-guiding vanes 22 are further ensured to guide the airflow blown out of the air outlet duct 111.

[0039] like Figure 5 As shown, the protective shell 20 also includes multiple reinforcing ribs 23, with both ends of the reinforcing ribs 23 connected to the flow-guiding vanes 22 and the outer shell 21, respectively. The flow-guiding vanes 22 have two opposing flow-guiding surfaces 221, and the multiple reinforcing ribs 23 are spaced apart on the two flow-guiding surfaces 221. By providing multiple reinforcing ribs 23, the fixing strength of the multiple flow-guiding vanes 22 on the outer shell 21 is ensured.

[0040] like Figure 2 As shown, in the depth direction of the mounting hole 113, the size of the reinforcing rib 23 is less than or equal to the size of the mounting hole 113. This design ensures that the reinforcing rib 23 does not obstruct the airflow within the air outlet duct 111, effectively reducing the air resistance within the air outlet duct 111, making the airflow within the air outlet duct 111 smoother, improving the energy efficiency of the fan, and also reducing the noise during airflow.

[0041] like Figure 2 and Figure 3 As shown, the inner shell 10 also includes a fixed wing 12 fixed inside the shell 11. The fixed wing 12 is located at the air outlet 112. One end of the guide wing 22 and the end of the fixed wing 12 facing the air outlet duct 111 are connected. The guide wing 22 and the fixed wing 12 together guide the air blown out from the air outlet duct 111. By designing the guide wing 22 and the fixed wing 12 to be spliced ​​together, a through-type air diversion structure is formed (i.e., the guide wing 22 passes through the mounting hole 113). Compared with the common structure where the guide wing and the inner shell are integrally formed, the through-type air diversion structure has a longer diversion length, realizing efficient air blowing at the fan head air outlet and improving the user experience.

[0042] Specifically, the length of the fixed vane 12 ranges from 4 to 6 mm, and the length of the guide vane 22 ranges from 13 to 15 mm. By setting the lengths of the fixed vane 12 and the guide vane 22, subsequent processing is facilitated while ensuring the air guiding effect.

[0043] Specifically, the fixed vane 12 is 5mm long, and the airflow guiding vane 22 is 14mm long. This design achieves a balance between ease of manufacturing and airflow guiding effect, effectively reducing costs.

[0044] It is worth noting that, due to manufacturing limitations, the length of the commonly used air-guiding vane (equivalent to the fixed vane 12 in this application), which is integrally formed with the inner shell, is usually around 5mm, resulting in poor air-guiding effect. This invention, by setting the air-guiding vane 22 on the outer shell 21, ensures that the air-guiding vane 22 is not limited by the manufacturing of the inner shell and has a sufficiently long length. Furthermore, using existing processing technology, the length of the air-guiding vane 22 can reach approximately 14mm. By splicing the air-guiding vane 22 and the fixed vane 12, an air-guiding structure with a guiding length of approximately 19mm is formed. Figure 8 and Figure 9 As shown, through simulation calculations using fluid simulation software and actual usage tests, the air guiding effect is significantly improved. Figure 8 contrast Figure 9 , Figure 8 and Figure 9 The coordinate units are consistent, which shows that... Figure 8 The bladeless fan in the middle blows the air farther and wider, improving the user's comfort.

[0045] like Figure 2 As shown, the fixed vane 12 has a guide surface 121, and the airflow guide vane 22 has an airflow guide surface 221. One edge of the guide surface 121 and one edge of the airflow guide surface 221 are aligned. The guide surface 121 and the airflow guide surface 221 are coplanar, or the guide surface 121 is inclined relative to the airflow guide surface 221. By setting the positional relationship between the guide surface 121 and the airflow guide surface 221, the airflow effect of the fan head can be flexibly adjusted (for example, setting the guide surface 121 and the airflow guide surface 221 to be coplanar to make the airflow travel further, or setting the guide surface 121 to be inclined relative to the airflow guide surface 221 to adjust the airflow angle and wind speed, etc.), thus achieving flexible adaptation to actual airflow requirements.

[0046] like Figure 2As shown, the housing 11 includes a first sidewall 114 and a second sidewall 115 opposite to each other. The air outlet duct 111 and the air outlet 112 are both located between the first sidewall 114 and the second sidewall 115. The outer shell 21 is connected to the first sidewall 114, and the air guide vane 22 passes through the first sidewall 114 into the air outlet duct 111 and abuts against the second sidewall 115. By setting the air guide vane 22 to abut against the second sidewall 115, the deformation of the housing 11 is reduced, thereby avoiding the problem of deformation of the air outlet duct 111 and the air outlet 112 due to external impact during fan transportation.

[0047] Specifically, the inner diameter of the mounting hole 113 at the end near the air outlet duct 111 is smaller than the inner diameter at the end away from the air outlet duct 111. By designing the mounting hole 113 as an alkaline shrinkage hole, it not only guides the insertion of the guide vane 22 through the mounting hole 113 (at the end with the larger inner diameter), improving installation accuracy and facilitating installation, but also ensures the seal between the outer casing 21 and the housing 11 at the mounting hole 113 (at the end with the smaller inner diameter), preventing air leakage.

[0048] like Figure 3 and Figure 4 As shown, the inner shell 10 has a slot 13, and the protective shell 20 also includes a protrusion 24, which is disposed on the outer shell 21. The protrusion 24 and the slot 13 are engaged. By setting the protrusion 24 and the slot 13 to engage, the installation strength of the protective shell 20 on the inner shell 10 is effectively improved, and the shaking of the protective shell 20 on the inner shell 10 is avoided.

[0049] Specifically, there are multiple protrusions 24, which are spaced apart on the periphery of the outer shell 21. There are also multiple slots 13, which are matched one-to-one with the multiple protrusions 24. By setting multiple protrusions 24 and multiple slots 13 to match one-to-one, the installation strength of the protective shell 20 on the inner shell 10 is further improved.

[0050] like Figure 1 As shown, the fan head also includes a connecting shell 30 and two inner shells 10, which are arranged opposite each other and connected to the connecting shell 30. The connecting shell 30 and the two inner shells 10 form an integral injection-molded structure. The protective shell 20 is also an integral injection-molded structure, and there are two protective shells 20, which are respectively set on the two inner shells 10. This arrangement ensures both the overall aesthetics of the fan head due to the symmetrical design and the uniformity of airflow from the fan head. Furthermore, the integral injection-molded structure allows for the implementation of complex structures at a lower cost.

[0051] like Figure 6 and Figure 7 As shown, the present invention also provides a bladeless fan, including the aforementioned fan head. The bladeless fan proposed in this invention blows air farther and wider, and is more comfortable to use.

[0052] like Figure 1 As shown, the bladeless fan also includes a flow divider cone 40, which includes a front flow divider cone 41 and a rear flow divider cone 42, which are installed correspondingly. The interior of the flow divider cone 40 has a main air duct, a first air duct, and a second air duct. The first and second air ducts are respectively connected to the main air duct. The first air duct is connected to the outlet air duct 111 of one inner shell 10, and the second air duct is connected to the outlet air duct 111 of the other inner shell 10. By setting the front flow divider cone 41 and the rear flow divider cone 42, both simple assembly of the flow divider cone 40 and effective airflow diversion are achieved.

[0053] In summary, this invention provides a fan head and a bladeless fan. By setting a guide vane 22 on the outer shell 21, this invention ensures that the guide vane 22 has a sufficiently long length, unrestricted by the manufacturing limitations of the inner shell 10, and that the length of the guide vane 22 meets the actual airflow requirements. The guide vane 22 is combined with the air outlet 112 of the inner shell 10 to form a through-type airflow structure. Since the guide vane 22 can be made relatively long, this invention has a better airflow guiding effect on the air blown from the air outlet 112 of the fan head, allowing the air to be blown further or more accurately in the desired direction, achieving efficient airflow from the air outlet 112 of the fan head and improving the user experience.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0056] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fan head, characterized in that, include: The inner shell (10) includes a shell (11) having an air outlet duct (111) and an air outlet (112) communicating with the air outlet duct (111). The protective shell (20) includes an outer shell (21) and a guide vane (22) disposed on the outer shell (21). The outer shell (21) is connected to the housing (11). The outer shell (21) covers the outer surface of one side of the inner shell (10). The guide vane (22) extends from the housing (11) into the air outlet duct (111). The guide vane (22) guides the air blown out from the air outlet duct (111). The inner shell (10) also includes a fixed wing (12) fixed inside the shell (11). The fixed wing (12) is located at the air outlet (112). One end of the guide wing (22) and the other end of the fixed wing (12) are connected to the end of the air outlet duct (111). The guide wing (22) and the fixed wing (12) together guide the air blown out from the air outlet duct (111).

2. The fan head according to claim 1, characterized in that, The side wall of the housing (11) is provided with a plurality of mounting holes (113) spaced apart, and the outer shell (21) is provided with a plurality of the air-guiding vanes (22) spaced apart. The plurality of air-guiding vanes (22) are inserted into the air outlet duct (111) from the plurality of mounting holes (113) in a corresponding manner.

3. The fan head according to claim 2, characterized in that, The protective shell (20) also includes a plurality of reinforcing ribs (23), the two ends of which are connected to the drainage wing (22) and the outer shell (21) respectively; the drainage wing (22) has two opposite drainage surfaces (221), and the plurality of reinforcing ribs (23) are spaced apart on the two drainage surfaces (221).

4. The fan head according to claim 3, characterized in that, In the depth direction of the mounting hole (113), the size of the reinforcing rib (23) is less than or equal to the size of the mounting hole (113).

5. The fan head according to claim 1, characterized in that, The length of the fixed wing (12) ranges from 4mm to 6mm, and the length of the diversion wing (22) ranges from 13mm to 15mm.

6. The fan head according to claim 1, characterized in that, The length of the fixed wing (12) is 5 mm, and the length of the diversion wing (22) is 14 mm.

7. The fan head according to claim 1, characterized in that, The fixed blade (12) has a guide surface (121), the flow-guiding blade (22) has a flow-guiding surface (221), one edge of the guide surface (121) and one edge of the flow-guiding surface (221) are connected, the guide surface (121) and the flow-guiding surface (221) are coplanar, or the guide surface (121) is inclined relative to the flow-guiding surface (221).

8. The fan head according to claim 1, characterized in that, The housing (11) includes a first sidewall (114) and a second sidewall (115) opposite to each other. The air outlet duct (111) and the air outlet (112) are both located between the first sidewall (114) and the second sidewall (115). The outer shell (21) is connected to the first sidewall (114). The air guide vane (22) passes through the first sidewall (114) into the air outlet duct (111) and abuts against the second sidewall (115).

9. The fan head according to claim 2, characterized in that, The inner diameter of the mounting hole (113) near the end of the air outlet duct (111) is smaller than the inner diameter of the end away from the air outlet duct (111).

10. The fan head according to claim 1, characterized in that, The inner shell (10) has a slot (13), and the protective shell (20) also includes a protrusion (24), which is disposed on the outer shell (21), and the protrusion (24) and the slot (13) engage with each other.

11. The fan head according to claim 10, characterized in that, There are multiple protrusions (24), which are spaced apart on the periphery of the outer shell (21). There are multiple slots (13), which are engaged with the multiple protrusions (24) in a one-to-one correspondence.

12. The fan head according to claim 1, characterized in that, The fan head also includes a connecting shell (30), and there are two inner shells (10). The two inner shells (10) are arranged opposite to each other and are both connected to the connecting shell (30). The connecting shell (30) and the two inner shells (10) form an integral injection molded structure. The protective shell (20) is an integral injection molded structure. There are two protective shells (20), and the two protective shells (20) are respectively arranged on the two inner shells (10).

13. A bladeless fan, characterized in that, Includes the fan head as described in any one of claims 1 to 12.

14. A bladeless fan, characterized in that, Including the fan head as described in claim 12, the bladeless fan further includes a flow divider cone (40), the flow divider cone (40) includes a front flow divider cone (41) and a rear flow divider cone (42), the front flow divider cone (41) and the rear flow divider cone (42) are installed correspondingly; the interior of the flow divider cone (40) has a main air duct, a first air duct and a second air duct; the first air duct and the second air duct are respectively connected to the main air duct; the first air duct is connected to the air outlet duct (111) of one of the inner shells (10), and the second air duct is connected to the air outlet duct (111) of the other inner shell (10).

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