Air duct structure and fan

Abstract

The utility model belongs to the technical field of fans, and particularly relates to an air duct structure and a fan. The air duct structure comprises an air duct shell provided with an air inlet end and an air outlet end, the air duct shell is further provided with a ventilation hole, and the two ends of the ventilation hole extend to the air inlet end and the air outlet end respectively; the mounting table is arranged in the ventilation hole and located at the air outlet end, and the side surface of the mounting table and the hole wall of the ventilation hole are arranged at an interval; the flow guide plate is located in the ventilation hole and is obliquely arranged relative to the radial direction of the air duct shell, and the two side plate edges of the flow guide plate are connected with the hole wall of the ventilation hole and the side surface of the mounting table correspondingly; the multiple flow guide plates are arranged in the circumferential direction of the mounting table at intervals, and any two adjacent flow guide plates, the mounting table and the hole wall of the ventilation hole jointly form an air guide channel. According to the utility model, the air flow in the ventilation hole can be gathered, a good air guide effect is achieved, and finally the air speed and the air flow strength of the air flow flowing out of the air outlet end are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fan technical field especially, it relates to a wind tube structure and fan. BACKGROUND

[0002] At present, the fan is widely used in laboratory, physiotherapy room, industrial production, art crafts and other fields, is used for local drying, heating and physiotherapy scene. Its working principle is through motor drive rotor rotation, drives the air vane movement, forms centrifugal airflow. Air is inhaled after from the air inlet, blows out from the front end through the wind tube, forms continuous airflow.

[0003] However, in the design of the existing fan, the airflow driven by the motor directly discharges after passing through the wind cavity where the motor is located. This structure makes the airflow more dispersed and difficult to form high-strength and concentrated airflow. For use scenarios that require strong airflow, such as fast drying of hair styles, precise styling, or efficient local heating, the performance of traditional fans often cannot meet the actual needs. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a wind tube structure to solve the problem of how to improve the blowing airflow intensity.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0006] In a first aspect, a wind tube structure is provided, comprising:

[0007] A wind tube shell having an air inlet end and an air outlet end, the wind tube shell further having a ventilation hole, both ends of the ventilation hole extending to the air inlet end and the air outlet end respectively;

[0008] A mounting table arranged in the ventilation hole and located at the air outlet end, the side surface of the mounting table being arranged spaced apart from the hole wall of the ventilation hole; and

[0009] A guide plate located in the ventilation hole and arranged obliquely relative to the radial direction of the wind tube shell, both side edges of the guide plate being connected to the hole wall of the ventilation hole and the side surface of the mounting table respectively;

[0010] Wherein, a plurality of guide plates are arranged along the circumference of the mounting table, any two adjacent guide plates, the mounting table and the hole wall of the ventilation hole collectively form a wind guide channel

[0011] In some embodiments, each guide plate is arranged with equal curvature along the circumference of the mounting table.

[0012] In some embodiments, one side surface of the guide plate is a convex curved surface, and the other side surface of the guide plate is a concave curved surface.

[0013] In some embodiments, the protruding directions of the plate surfaces of the guide plates are the same along the circumference of the mounting table.

[0014] In some embodiments, the air duct structure further comprises a wind gathering shell having a wind gathering surface, the wind gathering shell is connected to the mounting table at the air outlet end, and the wind gathering surface is used to gather the air flow out of each of the air guide channels.

[0015] In some embodiments, the cross-sectional area of the wind gathering shell decreases in the direction from the air inlet end to the air outlet end.

[0016] In some embodiments, the mounting table is provided with a positioning hole, and the surface of the wind gathering shell opposite to the wind gathering surface is provided with a positioning column, the positioning column is inserted into the positioning hole.

[0017] In some embodiments, the air duct structure further comprises a rotating structure connected to the mounting table, an impeller, and a motor, the rotating structure, the motor, and the impeller are located in the ventilation hole, the motor is connected to the rotating structure, the impeller is rotationally connected to the rotating structure and located at the air inlet end, and the motor is used to drive the impeller to rotate.

[0018] In some embodiments, the rotating structure comprises a rotating sleeve having a rotating hole and connected to the mounting table, rotating support seats arranged in the rotating hole, a rotating shaft having one end connected to the impeller, and an elastic member having an elastic restoring force and located in the rotating hole, two of the rotating support seats are arranged in the rotating hole, the other end of the rotating shaft is inserted into the rotating hole and connected to the two rotating support seats, the elastic member is located between the two rotating support seats, and the two ends of the elastic member are respectively connected to the two rotating support seats.

[0019] In some embodiments, the rotating structure further comprises a positioning plate having an avoiding hole and connected to the mounting table, the rotating sleeve is connected to the positioning plate at the avoiding hole, and the rotating structure further comprises a dustproof cover connected to the rotating sleeve and sealing the avoiding hole.

[0020] The air duct structure forms a plurality of air guide channels in the ventilation hole, so that when the air flow flows through each air guide channel, each air guide channel can make the air flow form a rotation out of the air guide channel along the axial direction, which is conducive to gathering the air flow in the ventilation hole and achieving a good air guide effect, and ultimately improves the wind speed and air flow intensity of the air flow out of the air outlet end. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0022] Figure 1 is a perspective structural schematic view of the air duct structure provided by the embodiment of the present application;

[0023] Figure 2 is a sectional view of the air duct structure of Figure 1 ;

[0024] Figure 3 is an exploded schematic view of the fan with the air duct structure in another embodiment of the present application;

[0025] Figure 4 is a perspective structural schematic view of the fan provided by another embodiment of the present application.

[0026] In the drawings, various reference signs represent:

[0027] 100, air duct structure; 101, air outlet end; 102, air inlet end; 103, air duct shell; 104, ventilation hole; 105, air gathering shell; 106, guide plate; 107, air guide channel; 108, mounting table; 109, impeller; 110, motor; 1051, positioning column; 1081, positioning hole; 500, fan; 200, adapter sleeve; 201, rotating hole; 210, rotating shaft; 220, bearing seat; 230, elastic member; 410, positioning plate; 413, avoiding hole; DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0029] It is to be noted that when a component is referred to as being "fixed" or "set" on another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for convenience of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first", "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0030] Referring to Figures 1 to 3 , the embodiment of the present application provides a wind tube structure 100 and a fan 500 with the same.

[0031] Referring to Figures 1 to 3 , the wind tube structure 100 comprises a wind tube shell 103, a mounting table 108 and a flow guide plate 106.

[0032] The wind tube shell 103 has an air inlet end 102 and an air outlet end 101, and is further provided with a ventilation hole 104, both ends of the ventilation hole 104 extending to the air inlet end 102 and the air outlet end 101 respectively. External airflow can flow into the ventilation hole 104 from the air inlet end 102 and flow out of the ventilation hole 104 from the air outlet end 101. It can be understood that the external airflow can flow into the ventilation hole 104 from the air inlet end 102 under the action of the impeller 109, and the flow direction of the airflow is as shown by the arrow in Figure 1 .

[0033] Referring to Figures 1 to 3 , the mounting table 108 is arranged in the ventilation hole 104 and located at the air outlet end 101, and the side surface of the mounting table 108 is arranged in a spaced manner with the hole wall of the ventilation hole 104. It can be understood that the shape of the mounting table 108 is cylindrical, and the side surface of the mounting table 108 is not in contact with the hole wall of the ventilation hole 104, and the mounting table 108 is arranged at the air outlet end 101 to mount the flow guide plate 106.

[0034] The guide plate 106 is located in the ventilation hole 104 and is inclined relative to the radial direction of the air duct shell 103, that is, the guide plate 106 is at an inclination angle, so that the guide plate 106 can guide the airflow when the airflow flows through the guide plate 106. The two side edges of the guide plate 106 are connected to the hole wall of the ventilation hole 104 and the side surface of the mounting table 108 respectively, so that the guide plate 106 can connect the mounting table 108 and the air duct shell 103.

[0035] Referring to Figures 1 to 3 The guide plate 106 is arranged in a plurality of intervals along the circumference of the mounting table 108, and any two adjacent guide plates 106, the mounting table 108 and the hole wall of the ventilation hole 104 together form an air guide channel 107. It can be understood that the guide plates 106 are arranged in a radial manner outward along the circumference of the mounting table 108, and a plurality of air guide channels 107 are arranged along the circumference of the mounting table 108, so that the airflow entering the ventilation hole 104 can be guided.

[0036] Referring to Figures 1 to 3 It can be understood that the guide plate 106 is inclinedly arranged in the ventilation hole 104, and the inclination angle is a certain value, which aims to maximize the guidance and acceleration of the airflow. The two side edges of the guide plate 106 are closely connected to the hole wall of the ventilation hole 104 and the side surface of the mounting table 108 respectively, forming a stable connection structure, and also ensuring that the airflow can be effectively guided when flowing through. A plurality of guide plates 106 are arranged in an interval manner along the circumference of the mounting table 108, and each two adjacent guide plates 106, the mounting table 108 and the hole wall of the ventilation hole 104 together form an air guide channel 107. These air guide channels 107 are distributed in a radial manner, like the spokes of a wheel, which uniformly and efficiently guide the airflow out of the air outlet end 101.

[0037] Referring to Figures 1 to 3 The air duct structure 100 provided by the embodiment of the present application forms a plurality of air guide channels 107 in the ventilation hole 104, so that the airflow can form axial rotation outflow when flowing through each air guide channel 107, which is beneficial to wind gathering in the ventilation hole 104 and has a good air guiding effect, and finally improves the wind speed and airflow intensity of the airflow flowing out of the air outlet end 101.

[0038] Referring to Figures 1 to 3 Optionally, in the embodiment, eight guide plates 106 are arranged, and in other embodiments, nine or more guide plates 106 can be arranged, which is not limited here and can be selected according to actual conditions.

[0039] Optionally, the materials of the air duct shell 103, the guide plate 106 and the mounting table 108 can be plastic, which can be integrally formed by injection molding process, which not only ensures the strength and durability of the structure, but also improves the production efficiency.

[0040] Injection molding is a plastic manufacturing process that involves injecting molten plastic material into a mold and then cooling and solidifying it into a shape. The principle is to inject the heated and molten plastic material into the mold through an injection machine, and then cool and shape it.

[0041] Referring to Figures 1 to 3 In some embodiments, the guide vanes 106 are arranged along the circumference of the mounting platform 108 with equal arc.

[0042] Referring to Figures 1 to 3 Optionally, the guide vanes 106 are arranged along the circumference of the mounting platform 108 with equal arc, so that the cross-sectional area of each air guide channel 107 is the same, and the size of the air flow from each air guide channel 107 is the same, avoiding uneven air distribution. Ensuring the uniformity of the air flow velocity in each air guide channel 107, improving the air speed at the air outlet end 101 of the air duct structure 100, while reducing turbulent noise.

[0043] In some embodiments, one side of the guide vane 106 is convex, and the other side of the guide vane 106 is concave.

[0044] Referring to Figures 1 to 3 Optionally, one side of the guide vane 106 is convex, and the other side of the guide vane 106 is concave, so that the guide vane 106 as a whole is curved and has a certain arc shape, so that the air flow from each air guide channel 107 can be discharged in a spiral rotating manner, which can enhance the air flow gathering effect, reduce air flow dispersion, improve air flow kinetic energy conversion efficiency, and thus improve the air flow intensity and air flow speed at the air outlet end 101.

[0045] In some embodiments, along the circumference of the mounting platform 108, the convex direction of the plate surface of each guide vane 106 is the same.

[0046] Referring to Figures 1 to 3 Optionally, the convex arc surface direction of each guide vane 106 is consistent, so that the air flow rotating direction of the air guide channel 107 is the same, so that the air flow from each air guide channel 107 is discharged in the same rotating direction, which can reduce turbulence and improve the stability of air flow and the flow rate of air flow.

[0047] Referring to Figures 1 to 3 In some embodiments, the air duct structure 100 further comprises a wind gathering shell 105 having a wind gathering surface, the wind gathering shell 105 is connected to the mounting platform 108 at the air outlet end 101, and the wind gathering surface is used to gather the air flow from each air guide channel 107.

[0048] Referring to Figures 1 to 3Optionally, the air-concentrating housing 105 is connected to the mounting platform 108 and provides an air-concentrating surface for each air guide channel 107. The air-concentrating surface can guide and concentrate the airflow from each air guide channel 107 toward the central axis of the air duct housing 103, so that the airflow can be converged to a certain extent, thereby increasing the intensity of the converged airflow and enhancing the air outlet performance of the fan 500.

[0049] In some embodiments, the cross-sectional area of ​​the air-collecting housing 105 is reduced along the direction from the air inlet end 102 to the air outlet end 101.

[0050] Please see Figures 1 to 3 It is understandable that the wind-gathering shell 105 can be an integral pyramid shape, with the large end of the pyramid connected to the mounting platform 108. The wind-gathering surface includes multiple conical surfaces, and each air guide channel 107 is provided with a conical surface. The conical surfaces intersect at a position away from the mounting platform 108, so that each conical surface can gather wind and guide each air guide channel 107 respectively.

[0051] Optionally, the cross-sectional area of ​​the air-concentrating shell 105 gradually decreases from the air inlet end 102 to the air outlet end 101, which can effectively improve the speed and intensity of the airflow, enhance the air delivery performance of the fan 500, and effectively increase the airflow delivery distance.

[0052] Please see Figures 1 to 3 In some embodiments, the air-gathering surface is spherical. The spherical air-gathering surface can converge the airflow within each air guide channel 107, thereby providing airflow intensity and velocity, and thus increasing the airflow transmission distance.

[0053] It is also understandable that the spherical wind-gathering surface can concentrate the airflow in each air guide channel 107, reduce the flow loss and turbulence noise when the airflow passes through the wind-gathering shell 105, improve the overall efficiency and operational stability of the fan 500, and increase the transmission distance of the airflow.

[0054] Please see Figures 1 to 3 In some embodiments, the air-gathering surface is tangent to the side surface of the mounting platform 108.

[0055] Optionally, the mounting platform 108 has a circular cross-sectional shape, with the edge of its side surface connecting to the edge of the spherical wind-gathering surface. The airflow flowing out from the air guide channel 107 can smoothly converge along the wind-gathering surface, avoiding turbulence at the edge of the transition area, reducing energy loss when the airflow passes through the wind-gathering shell 105, and improving the wind-gathering effect.

[0056] In some embodiments, the mounting platform 108 has a positioning hole 1081, and the surface of the wind-gathering housing 105 facing away from the wind-gathering surface has a protruding positioning post 1051, which is inserted into the positioning hole 1081.

[0057] Please see Figures 1 to 3 Optionally, two positioning posts 1051 and two positioning holes 1081 are provided respectively, and the two positioning posts 1051 and two positioning holes 1081 are respectively set accordingly. Through the cooperation of the two positioning posts 1051 and positioning holes 1081, the convenience of assembling the wind concentrator housing 105 and the mounting platform 108 can be improved.

[0058] Optionally, the precise alignment of the air-concentrating housing 105 and the mounting platform 108 is ensured by the cooperation of the positioning post 1051 and the positioning hole 1081, avoiding installation errors. This improves the assembly accuracy of the air-concentrating housing 105 and the mounting platform 108, ensures the consistency of the air guiding effect, and facilitates assembly, disassembly, and maintenance.

[0059] Please see Figures 1 to 3 This utility model also proposes a fan 500, which includes a duct structure 100. The specific structure of the duct structure 100 is as described in the above embodiments. Since this fan 500 adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0060] Please see Figure 4 In some embodiments, the fan 500 further includes a rotating structure, an impeller 109, and a motor 110. The rotating structure, motor 110, and impeller 109 are all located in the ventilation hole 104. The motor 110 is connected to the mounting platform 108, and the impeller 109 is rotatably connected to the rotating structure and located at the air inlet 102.

[0061] Please see Figures 1 to 3 It is understandable that the impeller 109 is driven to rotate by the motor 110, so that the airflow enters the ventilation hole 104 from the air inlet 102, flows through each air guide channel 107, and then flows out of the ventilation hole 104 from the air outlet 101.

[0062] Please see Figures 1 to 3The rotating structure includes: an adapter sleeve 200 with a rotating hole 201 and connected to a mounting platform 108; a rotating support seat disposed in the rotating hole 201; a rotating shaft 210 with one end connected to an impeller 109; and an elastic element 230 with elastic restoring force and located in the rotating hole 201. Two rotating support seats are arranged at intervals in the rotating hole 201. The other end of the rotating shaft 210 is inserted into the rotating hole 201 and connected to the two rotating support seats. The rotating support seats can be bearing seats 220. The outer rings of the two bearing seats 220 abut against the hole wall of the rotating hole 201 and have an appropriate interference fit with the hole wall of the rotating hole 201, so that they can be positioned in the rotating hole 201. The rotating shaft 210 is inserted into the inner rings of the two bearing seats 220, so that the rotating shaft 210 is rotated and connected to the adapter sleeve 200 through the two bearing seats 220. The motor 110 can drive the rotation of the impeller 109, and the rotating shaft 210 can support the rotation of the impeller 109. The elastic element 230 is located between the two rotating support seats, and its two ends are respectively connected to the two rotating support seats. It can be understood that the elastic element 230 can undergo compressive deformation and push the two bearing seats 220 in two opposite directions, or the elastic element 230 can undergo tensile deformation and pull the two bearing seats 220 in two opposite directions. There is no restriction here, and the choice can be made according to the actual situation.

[0063] Please see Figures 2 to 3 The rotating structure provided in this application embodiment uses an elastic element 230 between two bearing seats 220 located in the rotating hole 201. The elastic deformation of the elastic element 230 can apply a force to the outer ring of the bearing seat 220, connecting the two bearing seats 220 into one unit, avoiding resonance between the two bearing seats 220. Furthermore, the elastic deformation of the elastic element 230 can also hinder the movement of the two bearing seats 220, thereby reducing the noise of the rotating shaft 210, enabling the rotating shaft 210 to maintain high-speed rotation, and increasing the output wind speed.

[0064] Please see Figures 2 to 3 Optionally, by providing an elastic element 230 between the two bearing housings 220, the two bearing housings 220 can provide stable rotational support for the rotating shaft 210, effectively reducing the wobble phenomenon when the impeller 109 rotates and improving the smoothness of the impeller 109's operation. The elastic element 230 provides elastic buffering for the two bearing housings 220, which helps to absorb and mitigate the vibration of the bearing housings 220 during rotation and reduce the noise during rotation.

[0065] Please see Figures 2 to 3In some embodiments, the elastic member 230 is in a compressed state, and the two ends of the elastic member 230 push the two bearing seats 220 in two opposite directions, so that the two bearing seats 220 tend to move in opposite directions. At the same time, the two bearing seats 220 are provided with blocking parts along the pushing direction of the elastic member 230. That is, the movement of the two bearing seats 220 away from each other is blocked by the blocking parts, and the tendency of the two bearing seats 220 to move towards each other is hindered by the compression deformation of the elastic member 230. Thus, the two bearing seats 220 can remain as one unit, and during the high-speed rotation of the rotating shaft 210, the two bearing seats 220 can remain stable and reduce noise.

[0066] Please see Figures 2 to 3 In some embodiments, the elastic element 230 is a tube spring that is sleeved on the rotating shaft 210, and the two ends of the tube spring are respectively connected to two bearing seats 220.

[0067] Please see Figures 2 to 3 Optionally, the tube spring can be sleeved on the rotating shaft 210, and the two ends of the tube spring abut against the outer ring of the two bearing seats 220 respectively. The tube spring can not only save installation space, but also provide axial uniform elastic restoring force, enhance the rotational stability of the two bearing seats 220, and can be suitable for miniaturized scenarios.

[0068] Please see Figures 2 to 3 In some embodiments, the rotating structure further includes a positioning plate 410 having a clearance hole 413 and connected to a mounting platform, an adapter sleeve 200 connected to the positioning plate 410 at the clearance hole 413, and a dust cover 300 connected to the adapter sleeve 200 and sealing the clearance hole 413.

[0069] Please see Figures 2 to 3 It is understood that the mounting platform 108 has a hollow structure, with the positioning plate 410 located inside it. The edge of the positioning plate 410 connects to the inner wall of the mounting platform 108. The positioning plate 410 can be integrally formed with the adapter sleeve 200, meaning both the positioning plate 410 and the adapter sleeve 200 are made of plastic and can be integrally formed through injection molding. The rotating hole 201 extends through and penetrates the positioning plate 410, which is a circular plate. The adapter sleeve 200 is located at the center of the positioning plate 410, ensuring accurate installation of the adapter sleeve 200 and improving the overall concentricity of the module.

[0070] Please see Figures 2 to 3 Optionally, the adapter sleeve 200 has a first end and a second end opposite to the first end. The first end is connected to the positioning plate 410, and the second end is provided with an impeller 109. The dust cover 300 prevents dust or impurities from entering the rotating hole 201 from the first end and can limit dust or foreign objects from entering the bearing housing 220, effectively protecting the bearing housing 220 and the elastic element 230, and extending their service life and stability.

[0071] Please see Figures 2 to 3 In some embodiments, the dust cover 300 includes a sealing plate 310 connected to the positioning plate 410 and a dust sleeve 320 connected to the sealing plate 310 and located in the rotating hole 201. The dust sleeve 320 abuts against one of the bearing seats 220 to limit the bearing seat 220.

[0072] Please see Figures 2 to 3 Optionally, the sealing plate 310 and the dust cover 320 enhance the sealing effect, prevent dust or foreign objects from entering the rotating hole 201 from the dust cover 320, so as to affect the bearing housing 220, improve the stability of the bearing housing 220 operation, and avoid noise.

[0073] Optionally, the dust cover 320 abuts against the bearing housing 220, which can restrict the free displacement of the bearing housing 220 and improve the positioning stability of the rotating shaft 210.

[0074] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A ventilation duct structure, characterized in that, include: The air duct housing has an air inlet end and an air outlet end, and the air duct housing is also provided with ventilation holes, the two ends of which extend to the air inlet end and the air outlet end respectively; An installation platform is disposed within the ventilation hole and located at the air outlet end, with the side surface of the installation platform spaced apart from the wall of the ventilation hole; as well as A guide plate is located inside the ventilation hole and is radially inclined relative to the air duct shell. The two side edges of the guide plate are respectively connected to the hole wall of the ventilation hole and the side surface of the mounting platform. The guide plates are arranged in multiple circumferentially along the mounting platform, and any two adjacent guide plates, the mounting platform, and the wall of the ventilation hole together form an air guiding channel.

2. The ventilation duct structure as described in claim 1, characterized in that: Each of the aforementioned guide plates is arranged with equal arc along the circumference of the mounting platform.

3. The ventilation duct structure as described in claim 1, characterized in that: One side of the guide plate has a convex arc surface, and the other side of the guide plate has a concave arc surface.

4. The ventilation duct structure as described in claim 3, characterized in that: Along the circumference of the mounting platform, the protrusion direction of each of the guide plates is the same.

5. The ventilation duct structure as described in any one of claims 1-4, characterized in that: The duct structure also includes a wind-gathering shell with a wind-gathering surface, which is connected to the mounting platform at the air outlet end. The wind-gathering surface is used to gather the airflow flowing out from each of the air guide channels.

6. The ventilation duct structure as described in claim 5, characterized in that: The cross-sectional area of ​​the air-collecting shell decreases along the direction from the air inlet end to the air outlet end.

7. The ventilation duct structure as described in claim 5, characterized in that: The mounting platform has a positioning hole, and the surface of the wind-gathering shell facing away from the wind-gathering surface has a protruding positioning post, which is inserted into the positioning hole.

8. A fan, characterized in that, The fan includes the duct structure as described in any one of claims 1-7, and the fan further includes a rotating structure, an impeller, and a motor connected to the mounting platform. The rotating structure, the motor, and the impeller are all located at the ventilation hole. The motor is connected to the rotating structure, and the impeller is rotatably connected to the rotating structure and located at the air inlet end. The motor is used to drive the impeller to rotate.

9. The fan as described in claim 8, characterized in that: The rotating structure includes an adapter sleeve with a rotating hole and connected to the mounting platform, a rotating support seat disposed in the rotating hole, a rotating shaft with one end connected to the impeller, and an elastic element with elastic restoring force located in the rotating hole. Two rotating support seats are arranged at intervals in the rotating hole. The other end of the rotating shaft is inserted into the rotating hole and connected to the two rotating support seats. The elastic element is located between the two rotating support seats, and both ends of the elastic element are respectively connected to the two rotating support seats.

10. The fan as described in claim 9, characterized in that: The rotating structure also includes a positioning plate with a clearance hole and connected to the mounting platform, the adapter sleeve is connected to the positioning plate at the clearance hole, and the rotating structure also includes a dust cover that connects to the adapter sleeve and seals the clearance hole.

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