Fan and ventilation device

Abstract

The utility model provides a fan and a ventilation device.The fan comprises a first cover plate, a second cover plate and a plurality of fan blades, the first cover plate is annular, and a first ventilation opening is formed in the inner side of the first cover plate; the second cover plate and the first cover plate are oppositely arranged at an interval, and a second ventilation opening is formed between the outer edge of the second cover plate and the outer edge of the first cover plate; the multiple fan blades are arranged between the first cover plate and the second cover plate at intervals around the center line of the first ventilation opening. The ends, close to the center of the first ventilation opening, of the fan blades extend into the first ventilation opening, so that the ends, close to the first ventilation opening, of the fan blades can be set to be high, the area of the fan blades is large, and the air volume is increased; and the end, close to the center of the first ventilation opening, of each fan blade is in the step shape with the height gradually increased in the direction from the center of the first ventilation opening to the edge of the first ventilation opening, noise can be effectively reduced, and therefore the fan is low in noise while having large air volume.

Description

Technical Field

[0001] This application relates to the field of ventilation equipment technology, and in particular to a fan and ventilation device. Background Technology

[0002] With the development of the automotive industry, users' demands for ride comfort are increasing. Especially in hot environments, poor air circulation can easily cause sweat to accumulate on the surfaces where the body contacts the seat, leading to stuffiness and discomfort. Therefore, automotive seat ventilation technology has gradually become an important direction for improving the driving and riding experience. However, existing seat ventilation fans still have shortcomings in design and performance. Current automotive seat ventilation technology struggles to balance the dual demands of airflow and noise, urgently requiring an innovative solution that can ensure ample airflow while operating with low noise. Utility Model Content

[0003] To address the aforementioned problems, in a first aspect, this application provides a fan capable of delivering a large volume of air while maintaining low noise operation. The fan includes an impeller, which comprises:

[0004] A first cover plate, the first cover plate being annular and having a first vent on its inner side;

[0005] A second cover plate is provided opposite to and spaced apart from the first cover plate, and a second vent is formed between the outer edge of the second cover plate and the outer edge of the first cover plate;

[0006] Multiple fan blades are arranged at intervals around the center line of the first vent between the first cover plate and the second cover plate; one end of each fan blade near the center of the first vent extends into the first vent and forms a stepped shape with gradually increasing height from the center to the edge of the first vent.

[0007] In some embodiments, the second cover plate has a mounting port in the middle, and the fan further includes a drive assembly, which is installed in the mounting port and drives the impeller to rotate around the center of the mounting port.

[0008] In some embodiments, the ventilation device further includes an air duct structure and the fan described in the first aspect, the air duct structure being used to allow airflow to flow into or out of the fan.

[0009] In some embodiments, the air duct structure includes a protective shell disposed on the side of the first cover plate away from the second cover plate. The protective shell has a third vent, a protective shell cavity, and a fourth vent connected in sequence. The third vent is connected to the first vent, and the fourth vent is used to allow airflow to flow into or out of the protective shell cavity.

[0010] In some embodiments, one of the protective shell's side facing the first cover plate and the first cover plate's side facing the protective shell is provided with an annular protrusion, and the other is provided with an annular groove that engages with the annular protrusion.

[0011] In some embodiments, the duct structure further includes a corrugated pipe, one end of which is connected to the fourth vent.

[0012] In some embodiments, there are two fourth vents and two corrugated pipes, with each corrugated pipe connected to a corresponding fourth vent.

[0013] In some embodiments, the duct structure further includes an air guide structure, one end of which is connected to the other end of the corrugated pipe, and the other end of which has two insertion ports at an angle to each other.

[0014] In some embodiments, the ventilation device further includes a fixing member disposed on the side of the second cover plate away from the first cover plate, and an installation space for installing the fan is formed between the middle portion of the protective shell and the middle portion of the fixing member, and a fifth ventilation port communicating with the second ventilation port is formed at intervals between the outer edge of the protective shell and the outer edge of the fixing member.

[0015] In some embodiments, at least one of the fastener and the protective shell has an epoxy resin layer or a carbon fiber composite material layer on its outer surface.

[0016] In some embodiments, the air duct structure is provided with a non-woven needle-punched cotton layer.

[0017] In some embodiments, the air duct structure is provided with a noise reduction module.

[0018] The fan provided in this application includes a first cover plate, a second cover plate, and multiple fan blades. The first cover plate is annular and has a first vent on its inner side. The second cover plate is opposite to and spaced apart from the first cover plate, and a second vent is formed between the outer edges of the second cover plate and the outer edges of the first cover plate. Multiple fan blades are arranged at intervals around the center line of the first vent between the first and second cover plates. The end of each fan blade near the center of the first vent extends into the first vent, allowing the height of the end of the fan blade near the first vent to be set higher, which results in a larger fan blade area, which is beneficial for increasing air volume. Furthermore, the end of each fan blade near the center of the first vent has a gradually increasing height step-like shape from the center to the edge of the first vent, which can effectively reduce noise, thus enabling the fan to have a large air volume while having low noise. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a first-view structural schematic diagram of a ventilation device provided in one embodiment of this application;

[0021] Figure 2 This is a second-view structural schematic diagram of a ventilation device provided in one embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the impeller structure of a fan provided in one embodiment of this application;

[0023] Figure 4 This is a cross-sectional view of a ventilation device provided in one embodiment of this application;

[0024] Figure 5 This is an enlarged view of section A of a ventilation device provided in one embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the structure of a protective shell provided in one embodiment of this application.

[0026] The following are the labeling elements in the figure:

[0027] 1-Ventilation device;

[0028] 10-Fan; 11-Impeller; 111-First cover plate; 1111-First vent; 1112-Annular protrusion; 112-Second cover plate; 1121-Second vent; 1122-Mounting port; 113-Fan blade; 1131-Fan blade top surface; 1132-Fan blade bottom surface; 1133-Fan blade inner end face; 114-Positioning ring; 12-Drive assembly; 121-Shaft; 122-Bearing; 123-Shaft sleeve; 124-Stator; 125-Rotor; 126-Mounting housing;

[0029] 20-Air duct structure; 21-Protective shell; 211-Third vent; 212-Inner cavity of protective shell; 213-Fourth vent; 214-Annular groove; 215-Threaded post; 22-Bellower; 23-Air guide structure; 231-Insertion interface;

[0030] 30 - Fastener; 301 - Fifth vent; 31 - Flat plate; 32 - Protrusion;

[0031] 40 - Control panel. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this application, it should be understood that the terms "inner," "outer," "upper," "bottom," "front," and "rear," etc., indicate the orientation or positional relationship (if any) based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of this application, and are not intended to 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 of this application.

[0036] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example in the figure. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0037] With the development of the automotive industry, users' demands for ride comfort are increasing. Especially in hot environments, poor air circulation can easily cause sweat to accumulate on the surfaces where the body contacts the seat, leading to stuffiness and discomfort. Therefore, automotive seat ventilation technology has gradually become an important direction for improving the driving and riding experience. However, existing seat ventilation fans still have shortcomings in design and performance. Current automotive seat ventilation technology struggles to balance the dual demands of airflow and noise, urgently requiring an innovative solution that can ensure ample airflow while operating with low noise.

[0038] Please see Figures 1 to 3 To address the aforementioned problems, this application provides a fan 10 that can be applied to car seats to provide heat dissipation and ventilation for specific areas of the car seat. The fan 10 can ensure a large airflow while operating with low noise. The fan 10 includes an impeller 11, which comprises a first cover plate 111, a second cover plate 112, and multiple fan blades 113. The first cover plate 111 is annular and has a first ventilation opening 1111 formed on its inner side. The second cover plate 112 is opposite to and spaced apart from the first cover plate 111, and a second ventilation opening 1121 is formed between the outer edge of the second cover plate 112 and the outer edge of the first cover plate 111. Multiple fan blades 113 are arranged at intervals around the center line of the first ventilation opening 1111 between the first cover plate 111 and the second cover plate 112. Each fan blade 113 extends into the first ventilation opening 1111 at one end near the center of the first ventilation opening 1111, and the end of each fan blade 113 near the center of the first ventilation opening 1111 has a step shape with gradually increasing height in the direction from the center of the first ventilation opening 1111 to the edge.

[0039] In this embodiment, please refer to Figure 3 The direction from the second cover plate 112 to the first cover plate 111 is defined as the first direction, and the first direction D1 is as follows: Figure 3 As shown by the middle arrow, the fan blade 113 includes a top surface 1131, a bottom surface 1132, and an inner end surface 1133. The top surface 1131 and the bottom surface 1132 are arranged opposite each other in the first direction D1. The inner end surface 1133 connects the top surface 1131 and the bottom surface 1132. The inner end surface 1133 is close to the inner side of the impeller 11. The end of each fan blade 113 near the center of the first ventilation port 1111 has a step-like shape with gradually increasing height in the direction from the center of the first ventilation port 1111 to the edge. It can be understood that the connection between the top surface 1131 and the inner end surface 1133 is stepped. In other words, in the direction from the center of the impeller 11 to the edge of the impeller 11, the distance from the top surface 1131 to the bottom surface 1132 increases in a step-like manner.

[0040] In this embodiment, the projection of the fan blade 113 onto the second cover plate 112 along the first direction D1 is arc-shaped.

[0041] The fan 10 provided in this application includes an impeller 11, which includes a first cover plate 111, a second cover plate 112, and a plurality of fan blades 113 disposed between the first cover plate 111 and the second cover plate 112. When the impeller 11 is driven to rotate in one direction by the drive assembly 12, the airflow can enter between two adjacent fan blades 113 through the second vent 1121 and finally leave the impeller 11 through the first vent 1111, thereby guiding the airflow from the second vent 1121 to the first vent 1111. When the impeller 11 is driven to rotate in another direction by the drive assembly 12, the airflow can enter between two adjacent fan blades 113 through the first vent 1111 and finally leave the impeller 11 through the second vent 1121, thereby guiding the airflow from the first vent 1111 to the second vent 1121.

[0042] The fan 10 provided in this application has each fan blade 113 extending into the first ventilation opening 1111 at one end near the center of the first ventilation opening 1111. This allows the height of the end of the fan blade 113 near the first ventilation opening 1111 to be set higher, resulting in a larger area of ​​the fan blade 113, which is beneficial for increasing air volume. Furthermore, the end of each fan blade 113 near the center of the first ventilation opening 1111 has a stepped shape with gradually increasing height from the center of the first ventilation opening 1111 to the edge. This stepped structure can effectively reduce noise, thus enabling the fan 10 to have a large air volume while having low noise.

[0043] In some embodiments, please refer to Figure 4 and Figure 5 The second cover plate 112 has a mounting port 1122 in the middle. The fan 10 also includes a drive assembly 12, which is installed in the mounting port 1122 and drives the impeller 11 to rotate around the center of the mounting port 1122.

[0044] Please refer to the figure. Figure 5The impeller 11 may also include a positioning ring 114, which is connected to the side of the fan blade 113 near the second cover plate 112. The positioning ring 114 is fitted inside the mounting opening 1122, and the inner side of the positioning ring 114 is used to install the drive assembly 12. As one implementation of the drive assembly 12, the drive assembly 12 may include a rotating shaft 121, a bearing 122, a bushing 123, a stator 124, a rotor 125, and a mounting shell 126. The mounting shell 126 is installed inside the positioning ring 114 by means of interference fit or other methods. One end of shaft 121 is fixedly connected to the side of mounting housing 126 opposite to the first cover plate 111. Bearing 122, bushing 123, stator 124, and rotor 125 are sequentially mounted on shaft 121 from the inside out. A coil can be installed on stator 124, and rotor 125 can be a magnet. When drive assembly 12 is working, rotor 125, under the magnetic excitation of the coil in stator 124, drives mounting housing 126 and impeller 11 to rotate synchronously. Drive assembly 12 can reverse direction, thereby causing fan 10 to deliver or draw air. Please refer to [link to relevant documentation]. Figure 5 In some implementations, the middle part of the mounting shell 126 can protrude toward the first cover plate 111, forming a larger space for mounting the drive assembly 12 on the side of the mounting shell 126 away from the first cover plate 111, which can make the impeller 11 and the drive assembly 12 arranged more compactly.

[0045] In this embodiment, the drive assembly 12 is integrated into the mounting port 1122 inside the impeller 11. The airflow generated by the rotation of the impeller 11 can effectively remove the heat of the drive assembly 12, and the drive assembly 12 and the impeller 11 are arranged in a relatively compact manner.

[0046] In some embodiments, please refer to Figure 2 The ventilation device 1 also includes an air duct structure 20 and a fan 10. The air duct structure 20 is used to allow airflow to enter or exit the fan 10. In this embodiment, the air duct structure 20 can guide the airflow generated by the fan 10 to the area on the seat that needs to be cooled, or it can guide the air from the area on the seat that needs to be cooled to the fan 10, thereby enabling the fan 10 to ventilate and cool specific areas of the seat.

[0047] In some embodiments, please refer to Figure 2 and Figure 6 The air duct structure 20 includes a protective shell 21, which is disposed on the side of the first cover plate 111 away from the second cover plate 112. The protective shell 21 has a third vent 211, a protective shell cavity 212, and a fourth vent 213 connected in sequence. The third vent 211 is connected to the first vent 1111, and the fourth vent 213 is used to allow airflow to enter or exit the protective shell cavity 212.

[0048] In this embodiment, the second vent 1121 and the first vent 1111 of the fan 10, the third vent 211 of the protective shell 21, the inner cavity 212 of the protective shell and the fourth vent 213 are connected in sequence to form a flow channel, which can guide the airflow to the area of ​​the seat that needs to be cooled or draw airflow from the area of ​​the seat that needs to be cooled. The protective shell 21 is located on the side of the first cover plate 111 away from the second cover plate 112, and can be made of a material with high structural strength to protect the fan 10, thereby playing the role of guiding air and protecting the fan 10 at the same time.

[0049] In some embodiments, please refer to Figure 5 and Figure 6 One of the protective shell 21 facing the first cover plate 111 and the first cover plate 111 facing the protective shell 21 is provided with an annular protrusion 1112, and the other is provided with an annular groove 214 that is inserted into the annular protrusion 1112. That is, the protective shell 21 has an annular protrusion 1112 on the side facing the first cover plate 111, and the first cover plate 111 has an annular groove 214 on the side facing the protective shell 21 (this case is not shown in the figure). Alternatively, please refer to the figure, the protective shell 21 has an annular groove 214 on the side facing the first cover plate 111, and the first cover plate 111 has an annular protrusion 1112 on the side facing the protective shell 21. Of course, in some cases, the protective shell 21 may have an annular protrusion 1112 on the side facing the first cover plate 111, and the first cover plate 111 may have an annular groove 214 on the side facing the protective shell 21. At the same time, the protective shell 21 may have an annular groove 214 on the side facing the first cover plate 111, and the first cover plate 111 may have an annular protrusion 1112 on the side facing the protective shell 21 (this case is not shown in the figure).

[0050] In this embodiment, the annular groove 214 and the annular protrusion 1112 are interlocked and can quickly position and install the impeller 11 on the protective shell 21, reducing the assembly difficulty of the fan 10 and the air duct structure 20 and improving the assembly efficiency.

[0051] In some embodiments, please refer to Figure 1 and Figure 2 The duct structure 20 also includes a corrugated pipe 22, one end of which is connected to the fourth vent 213.

[0052] In this embodiment, the corrugated pipe 22 can be made of materials such as polyethylene (PVC) or nylon (PA). The corrugated pipe 22 has a certain degree of flexibility and can be extended or shortened along the length direction of the corrugated pipe 22, and can also expand or contract along the radial direction of the corrugated pipe 22. It can also be bent. When the airflow flows from the corrugated pipe 22 to the fourth vent 213 of the protective shell 21 or the airflow flows from the fourth vent 213 of the protective shell 21 into the corrugated pipe 22, the corrugated pipe 22 can automatically adjust the cross-sectional area of ​​the air duct according to the change of air pressure, thereby improving airflow efficiency and reducing noise.

[0053] In some embodiments, please refer to Figure 1 and Figure 2 There are two fourth ventilation openings 213 and two corrugated pipes 22, each corrugated pipe 22 connected to its corresponding fourth ventilation opening 213. The use of two corrugated pipes 22 increases the duct area for air supply or suction, which helps increase airflow and reduce noise.

[0054] In some embodiments, the air duct structure 20 is provided with a non-woven needle-punched cotton layer, for example, a non-woven needle-punched cotton layer can be provided inside the corrugated pipe 22. The sound-absorbing properties of the non-woven needle-punched surface layer can be used to reduce airflow friction noise.

[0055] In some embodiments, the air duct structure 20 is provided with a noise reduction module, for example, at the fourth vent 213. The noise reduction module may be a structure combining multi-stage baffles and through holes, which can disperse airflow energy and absorb high-frequency noise, thereby reducing the operating noise of the fan 10.

[0056] In some embodiments, a noise reduction module is provided in the fourth vent 213, non-woven needle-punched cotton is provided inside the corrugated pipe 22, and a flow guiding structure is provided in the air duct to reduce the airflow turbulence. The noise of the fan 10 can be reduced to below 58 decibels.

[0057] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4 The air duct structure 20 also includes an air guide structure 23. One end of the air guide structure 23 is connected to the other end of the corrugated pipe 22, and the other end of the air guide structure 23 has two insertion ports 231 that are angled to each other. The two angled insertion ports 231 serve as the air outlet or air inlet of the ventilation device 1, which can guide the airflow in different directions or draw the airflow through different directions, which is beneficial to improving heat dissipation efficiency and enhancing the adaptability of the device.

[0058] In some embodiments, please refer to Figure 2 and Figure 5The ventilation device 1 also includes a fixing member 30, which is disposed on the side of the second cover plate 112 away from the first cover plate 111. An installation space for installing the fan 10 is formed between the middle part of the protective shell 21 and the middle part of the fixing member 30. A fifth ventilation port 301 communicating with the second ventilation port 1121 is formed by the outer edge of the protective shell 21 and the outer edge of the fixing member 30 at intervals.

[0059] Please see Figure 5 As a connection method between the fastener 30 and the protective shell 21, the fastener 30 includes a flat plate 31 and a protrusion 32. The flat plate 31 is annular, and the protrusion 32 is connected to the inner side of the flat plate 31. The protrusion 32 protrudes in a direction away from the second cover plate 112 relative to the flat plate 31. The inner space of the protrusion 32 is used to install the fan 10. The flat plate 31 is fixedly connected to the protective shell 21, and there is a gap between the flat plate 31 and the protective shell 21. This gap forms the fifth ventilation opening 301. As a connection method between the flat plate 31 and the protrusion 32, the protective shell 21 has a threaded post 215 protruding on the side facing the flat plate 31. The flat plate 31 has a through hole. After the screw passes through the through hole on the flat plate 31, it is threaded to the threaded post 215, which can realize the connection between the flat plate 31 and the protective shell 21, and at the same time, a gap is formed between the flat plate 31 and the protective shell 21.

[0060] In this embodiment, when the drive assembly 12 is disposed in the mounting port 1122 of the second cover plate 112, the fastener 30 can also be used to fix the stator 124 part of the drive assembly 12, and the control board 40 electrically connected to the drive assembly 12 can also be installed in the mounting space between the fastener 30 and the protective shell 21.

[0061] In this embodiment, the fixing member 30 and the protective shell 21 are respectively arranged on opposite sides of the fan 10, which can surround the fan 10 and play a good protective role for the fan 10.

[0062] In some embodiments, at least one of the fastener 30 and the protective shell 21 has an epoxy resin layer or a carbon fiber composite material layer on its outer surface. That is, only the outer surface of the fastener 30 has an epoxy resin layer or a carbon fiber composite material layer, or only the outer surface of the protective shell 21 has an epoxy resin layer or a carbon fiber composite material layer, or both the outer surfaces of the fastener 30 and the protective shell 21 have an epoxy resin layer or a carbon fiber composite material layer. The epoxy resin layer and the carbon fiber composite layer can be applied by spraying. Both the epoxy resin layer and the carbon fiber composite material layer have anti-corrosion properties. When the fastener 30 and the protective shell 21 are made of metal to improve structural strength, the epoxy resin layer or the carbon fiber composite layer can give the fastener 30 and the protective shell 21 high structural strength while also providing good corrosion resistance, thus making the fan 10 suitable for high humidity environments such as coastal areas or vehicle cabins.

[0063] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fan, characterized in that, The fan includes an impeller, the impeller comprising: A first cover plate, the first cover plate being annular and having a first vent on its inner side; A second cover plate is provided opposite to and spaced apart from the first cover plate, and a second vent is formed between the outer edge of the second cover plate and the outer edge of the first cover plate; Multiple fan blades are arranged at intervals around the center line of the first vent between the first cover plate and the second cover plate; one end of each fan blade near the center of the first vent extends into the first vent and forms a stepped shape with gradually increasing height from the center to the edge of the first vent.

2. The fan of claim 1, wherein, The second cover plate has a mounting port in the middle. The fan also includes a drive assembly, which is installed in the mounting port and drives the impeller to rotate around the center of the mounting port.

3. A ventilation device, characterized in that The ventilation device includes an air duct structure and a fan as described in any one of claims 1-2, wherein the air duct structure is used to allow airflow to flow into or out of the fan.

4. The venting device of claim 3, wherein, The air duct structure includes a protective shell, which is disposed on the side of the first cover plate away from the second cover plate. The protective shell has a third vent, a protective shell cavity, and a fourth vent connected in sequence. The third vent is connected to the first vent, and the fourth vent is used to allow airflow to flow into or out of the protective shell cavity.

5. The venting device of claim 4, wherein, The protective shell has an annular protrusion on one of the sides facing the first cover plate and the first cover plate has an annular groove that engages with the annular protrusion.

6. The venting device of claim 4, wherein, The duct structure also includes a corrugated pipe, one end of which is connected to the fourth ventilation opening.

7. The venting device of claim 6, wherein, There are two fourth ventilation openings and two corrugated pipes, with each corrugated pipe connected to its corresponding fourth ventilation opening.

8. The venting device of claim 6, wherein, The air duct structure also includes an air guide structure, one end of which is connected to the other end of the corrugated pipe, and the other end of which has two insertion ports that are at an angle to each other.

9. A ventilation device according to any one of claims 4-8, characterised in that The ventilation device further includes a fixing member, which is disposed on the side of the second cover plate away from the first cover plate. An installation space for installing the fan is formed between the middle part of the protective shell and the middle part of the fixing member. A fifth ventilation port communicating with the second ventilation port is formed at intervals between the outer edge of the protective shell and the outer edge of the fixing member.

10. The venting device of claim 9, wherein, At least one of the fastener and the protective shell has an epoxy resin layer or a carbon fiber composite material layer on its outer surface. And / or, the air duct structure is provided with a non-woven needle-punched cotton layer.

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