Air duct pressurization air outlet device

Abstract

The utility model relates to fan equipment technical field, especially a kind of air duct pressurization air outlet equipment, air duct pressurization air outlet equipment includes air outlet cylinder, air outlet cylinder includes outer tube and fixed base, the cross-sectional area of the outer peripheral portion of fixed base gradually increases along the air outlet direction of airflow channel, to make the outer peripheral surface of fixed base form pressurization camber surface, guide vane includes the first blade segment and second blade segment arranged along the air outlet direction of airflow channel, first blade segment is arranged in arc to form guide surface, the two sides of second blade segment are connected the inner peripheral surface of outer tube and pressurization camber surface respectively, to make the first blade segment and fixed base between the end portion close to fan blade form avoidance space, wherein, the cross-sectional area of air outlet cavity gradually decreases along air outlet direction, pressurization camber surface and guide surface are configured to guide the airflow of air inlet channel into air outlet cavity.The main purpose of the utility model is to propose a kind of air duct pressurization air outlet equipment, to realize airflow optimization effect using the air outlet cylinder produced integrally.

Description

Technical Field

[0001] This utility model relates to the field of fan equipment technology, and in particular to a duct pressurization and air outlet device. Background Technology

[0002] Existing fan equipment typically houses the fan blades within the fan's outlet chamber, allowing them to rotate. As the blades rotate, they drive airflow from the inlet into the outlet chamber, then agitate the airflow to blow it out from the outlet at a certain speed and force, thus achieving the fan's blowing effect.

[0003] In related technologies, if the air outlet duct needs to achieve the effects of airflow guidance and pressurization, a guide vane needs to be installed inside the air outlet duct. The air outlet duct has a tapered structure along the airflow direction. In order for the guide vane to achieve the airflow guidance effect, both the guide vane and the end of the air outlet duct near the air inlet need to be set in an arc shape so that the guide vane has an arc-shaped guide surface. The air outlet cavity formed by the air outlet duct is a tapered space. However, the design of the arc-shaped guide surface causes the guide vane to have a certain area of ​​connection and overlap with the end of the air outlet duct near the air inlet. After the air outlet duct is injection molded, it needs to be demolded. In the demolding process of the air outlet duct, the demolding action is difficult. At present, the production process of the air outlet duct requires a manual assembly step. The guide vane needs to be manually assembled into the inside of the air outlet duct, which causes low efficiency. Utility Model Content

[0004] The main purpose of this utility model is to propose a duct pressurization and air outlet device, which aims to achieve the effect of airflow pressurization and guidance using an integrated air outlet duct.

[0005] To achieve the above objectives, the air duct pressurization and air outlet device proposed in this utility model includes a fan assembly and an air outlet duct; the fan assembly includes fan blades and a fan, the fan blades are driven to the fan, the fan blades have an air inlet channel, the air outlet duct includes an outer cylinder, a fixed base and multiple guide vanes, the fan is connected to the fixed base, the fixed base and the guide vanes are disposed inside the outer cylinder, each guide vane is located between the outer cylinder and the fixed base, any two adjacent guide vanes, the fixed base and the outer cylinder enclose an air outlet cavity, the air inlet channel communicates with the air outlet cavity to form an airflow channel; The cross-sectional area of ​​the outer periphery of the fixed base gradually increases along the air outlet direction of the air duct pressurization and air outlet device, so that the outer periphery of the fixed base forms a pressurization arc surface. The guide vane includes a first blade segment and a second blade segment arranged along the air outlet direction of the air duct pressurization and air outlet device. The first blade segment is arc-shaped to form a guide surface. The two sides of the second blade segment are respectively connected to the inner periphery of the outer cylinder and the pressurization arc surface. One side of the first blade segment is connected to the inner periphery of the outer cylinder, and the other side of the first blade segment is spaced apart from the fixed base, so that a clearance space is formed between the first blade segment and the end of the fixed base near the fan blade. The cross-sectional area of ​​the air outlet cavity gradually decreases along the air outlet direction of the pressurized air outlet device in the air duct, and the pressurized arc surface and the guide surface are configured together to guide the airflow into the air outlet cavity.

[0006] In one embodiment, the length of the first leaf segment in the radial direction of the outer cylinder is L1, and the distance between the second leaf segment and the inner wall of the outer cylinder in the radial direction is L2, where L2 is greater than or equal to L1.

[0007] In one embodiment, the fan blade includes an inner hub, an outer hub, at least two first blades, and at least two second blades; The outer hub and the inner hub are coaxially arranged and sleeved on the outer periphery of the inner hub. An air inlet channel is formed between the outer hub and the inner hub. The air inlet channel is connected to the air outlet cavity. At least two first blades are spaced apart and connected to the outer periphery of the outer hub. At least two second blades are spaced apart and disposed in the air inlet channel and connected to the outer hub and the inner hub. The inner hub is connected to the fan.

[0008] In one embodiment, the cross-sectional area of ​​the portion of the inner hub near the air intake end of the airflow channel gradually decreases along the air outlet direction of the pressurized air outlet device.

[0009] In one embodiment, the projection of the first blade on the outer cylinder along the air outlet direction of the pressurized air outlet device in the air duct at least partially coincides with the first blade segment and / or the second blade segment.

[0010] In one embodiment, the first blade is bent along a first circumferential direction of the outer cylinder, and the first blade segment is bent along a second circumferential direction of the outer cylinder; the first circumferential direction of the outer cylinder is opposite to the second circumferential direction of the outer cylinder.

[0011] In one embodiment, the fixed base includes a first base body and a second base body, the second base body is located on the outer peripheral surface of the first base body, and each of the guide vanes is disposed on the outer peripheral surface of the second base body; the first base body has a bearing support portion on the side facing the air inlet side of the airflow channel, the bearing support portion extends toward the air inlet side of the airflow channel, and the fan is disposed on the bearing support portion.

[0012] In one embodiment, the cross-sectional area of ​​the second seat gradually increases along the air outlet direction of the pressurized air outlet device in the air duct, so that the outer peripheral surface of the second seat forms the pressurized arc surface.

[0013] In one embodiment, the fan assembly further includes a circuit board electrically connected to the fan; the first base, the second base, and the fan enclose a heat dissipation space, and the circuit board is disposed on the bearing support and located within the heat dissipation space; the inner hub is spaced apart from the second base so that the heat dissipation space is connected to the air inlet channel.

[0014] In one embodiment, the bottom wall of the first base is provided with a first wire passage, one of the guide vanes is provided with a wire passage channel, and the outer circumferential surface of the outer cylinder is provided with a second wire passage, the wire passage channel connecting the first wire passage and the second wire passage; The first cable port is connected to the heat dissipation space.

[0015] In the technical solution of this utility model, the guide vane is divided into a first blade segment and a second blade segment. One side of the first blade segment is connected to the inner circumferential surface of the outer cylinder, and the other side is spaced apart from the fixed seat to form a clearance space. This space avoids the connection and overlap between the first blade segment and the fixed seat, so that the outer cylinder, the fixed seat and the guide vane can be easily demolded after injection molding, eliminating the manual assembly of the guide vane and improving production efficiency. At the same time, the cross-sectional area of ​​the outer circumference of the fixed seat gradually increases along the air outlet direction to form a pressurizing arc surface. The first blade segment is arc-shaped to form a guide surface, and the cross-sectional area of ​​the air outlet cavity gradually decreases along the air outlet direction. The air inlet channel of the fan blade is connected to the air outlet cavity to form an airflow channel. When the airflow enters the air outlet cavity from the fan blade, the pressurizing arc surface and the guide surface jointly guide the airflow. Combined with the contraction structure of the air outlet cavity, effective pressurization of the airflow is achieved. At the same time, the arc-shaped guide surface ensures the smooth flow of the airflow and plays a good guiding role. In summary, this air duct pressurization and outlet equipment, through its integrated air outlet structure, solves the problem of demolding difficulties and improves production efficiency, while also taking into account the functions of airflow pressurization and guidance, thus enhancing the overall performance of the equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a structure of an embodiment of the air duct pressurization and air outlet device provided by this utility model; Figure 2 for Figure 1 An exploded view of an embodiment of a duct pressurized air outlet device; Figure 3 for Figure 1 A cross-sectional view of an embodiment of a duct pressurized air outlet device; Figure 4 A schematic diagram showing the dimensions of an embodiment of the air outlet provided by this utility model; Figure 5 A schematic diagram of the structure of an embodiment of the air outlet provided by this utility model; Figure 6 A schematic diagram of the structure of an embodiment of the fan blade provided by this utility model; Figure 7 for Figure 1 A diagram showing the flow direction of the internal airflow in an embodiment of a pressurized air outlet device for air ducts.

[0018] Explanation of icon numbers: 1000. Duct pressurized air outlet equipment; 10. Fan assembly; 11. Fan blade; 111. Inner hub; 1111. Guide arc section; 1111a. Guide arc surface; 1112. Extended straight section; 1112a. Flow-limiting straight surface; 112. Outer hub; 11a. Air inlet duct; 113. First blade; 114. Second blade; 12. Fan; 121. Fixed shaft; 122. Inner stator; 123. Outer rotor; 20. 20a, air outlet cavity; 20b, clearance space; 21, outer cylinder; 21a, receiving cavity; 21b, second cable passage; 22, fixing seat; 22a, pressurized arc surface; 221, first seat body; 222, second seat body; 22c, heat dissipation space; 22d, heat dissipation guide channel; 221a, first cable passage; 23, guide vane; 231, first vane segment; 232, second vane segment; 30, air inlet grille.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] In related technologies, if the air outlet duct needs to achieve the effects of airflow guidance and pressurization, a guide vane needs to be installed inside the air outlet duct. The air outlet duct has a tapered structure along the airflow direction. In order for the guide vane to achieve the airflow guidance effect, both the guide vane and the end of the air outlet duct near the air inlet need to be set in an arc shape so that the guide vane has an arc-shaped guide surface. The air outlet cavity formed by the air outlet duct is a tapered space. However, the design of the arc-shaped guide surface causes the guide vane to have a certain area of ​​connection and overlap with the end of the air outlet duct near the air inlet. After the air outlet duct is injection molded, it needs to be demolded. In the demolding process of the air outlet duct, the demolding action is difficult. At present, the production process of the air outlet duct requires a manual assembly step. The guide vane needs to be manually assembled into the inside of the air outlet duct, which causes low efficiency.

[0024] The main purpose of this utility model is to propose a duct pressurization and air outlet device 1000, which aims to achieve the effect of airflow pressurization and guidance using an integrated air outlet duct 20.

[0025] To achieve the above objectives, please refer to Figures 1 to 6 The air duct pressurization and air outlet device 1000 proposed in this utility model includes a fan assembly 10 and an air outlet duct 20; the fan assembly 10 includes a fan blade 11 and a fan 12, the fan blade 11 is driven to connect to the fan 12, the air outlet duct 20 includes an outer duct 21, a fixed seat 22 and a plurality of guide vanes 23, the fan 12 is connected to the fixed seat 22, the fixed seat 22 and the guide vanes 23 are disposed inside the outer duct 21, each guide vane 23 is located between the outer duct 21 and the fixed seat 22, and any two adjacent guide vanes 23, together with the fixed seat 22 and the outer duct 21, form an air outlet cavity 20a; The cross-sectional area of ​​the outer periphery of the fixed base 22 gradually increases along the air outlet direction of the airflow channel, so that the outer periphery of the fixed base 22 forms a pressurized arc surface 22a. The guide vane 23 includes a first blade segment 231 and a second blade segment 232 arranged along the air outlet direction of the airflow channel. The first blade segment 231 is arc-shaped to form a guide surface. The two sides of the second blade segment 232 are respectively connected to the inner periphery of the outer cylinder 21 and the pressurized arc surface 22a. One side of the first blade segment 231 is connected to the inner periphery of the outer cylinder 21. The other side of the first blade segment 231 is spaced apart from the fixed base 22, so that a clearance space 20b is formed between the first blade segment 231 and the end of the fixed base 22 near the fan blade 11. The cross-sectional area of ​​the air outlet cavity 20a gradually decreases along the air outlet direction of the airflow channel, and the pressurized arc surface 22a and the guide surface are configured together to guide the airflow into the air outlet cavity 20a.

[0026] It is understood that the duct pressurized air outlet device 1000 includes an air inlet grille 30, a fan assembly 10, and an air outlet duct 20. The air outlet duct 20 includes an outer cylinder 21 and a fixing base 22. The volume of the outer cylinder 21 is larger than the volume of the fixing base 22. At the same time, the outer cylinder 21 encloses and forms a receiving cavity 21a. Thus, both the fan assembly 10 and the fixing base 22 can be placed inside the receiving cavity 21a of the outer cylinder 21, so that the fan assembly 10 and the fixing base 22 are protected by the outer cylinder 21. The air inlet grille 30 is connected to the air outlet duct through various connection methods such as snap-fit, screw-fit, adhesive, and combinations of various connection methods. The end of 20 is fixedly connected, and the end face of the air inlet grille 30 facing the fan assembly 10 has multiple air inlets, which constitute an air inlet area. At the same time, the fan blades 11 of the fan assembly 10 have air inlet channels 11a, and the air outlet duct 20 has multiple air outlet chambers 20a. When the air duct pressurization and air outlet device 1000 is powered on, the fan 12 rotates, and the fan blades 11 connected to the fan 12 rotate synchronously. In this way, the air in the environment can enter the air duct pressurization and air outlet device 1000 from the air inlet area, and then be pressurized on the fan blades 11, and finally flow out from the air inlet, realizing the pressurized air flow.

[0027] The airflow exiting from the fan blade 11 is pressurized and guided by the fixed base 22 and the guide vanes 23. Specifically, the fixed base 22, near the end of the air inlet channel 11a, has a cross-sectional area that gradually increases along the air outlet direction of the airflow channel. This directly results in the air outlet cavity 20a, formed by the adjacent guide vanes 23, the fixed base 22, and the outer cylinder 21, having a space that gradually decreases along the air outlet direction of the pressurized air outlet device. As the airflow enters the air outlet cavity 20a from the fan blade 11, the compression effect on the airflow continuously increases as the space of the air outlet cavity 20a gradually contracts, thereby achieving effective pressurization of the airflow and ensuring that the airflow maintains a high pressure and velocity when it exits the air outlet duct 20. Meanwhile, the fixed base 22, due to the gradual increase in cross-sectional area of ​​its outer periphery along the air outlet direction, naturally forms a smooth pressurized arc surface 22a on its outer periphery. The first blade segment 231 of the guide vane 23 extends along the circumferential direction of the outer cylinder 21 to form an arc segment, thus forming a guide surface on the outer surface of the first blade segment 231. When the airflow enters the air outlet cavity 20a, the pressurized arc surface 22a and the arc-shaped guide surface of the first blade segment 231 simultaneously guide the airflow, directing it to flow along its arc surface. The two work together to smoothly and efficiently guide the airflow from the inlet channel 11a to the air outlet cavity 20a, ensuring the stability of the guiding effect. For the integrated molding of the air outlet duct 20, since one side of the first blade segment 231 is connected to the inner circumferential surface of the outer cylinder 21, and the other side is spaced apart from the fixed seat 22, a clearance space 20b is formed between the first blade segment 231 and the end of the fixed seat 22 near the fan blade 11. The second blade segment 232 extends along the air outlet direction of the air duct pressurized air outlet device and is a straight section on the fixed seat 22. In this way, the second blade segment 232 and the fixed seat 22 will not have problems such as displacement or undercut when the mold is opened, and the mold core can be directly extracted. This eliminates the structural interference during demolding after injection molding, allowing the mold to be smoothly separated along the air outlet direction. This realizes the integrated production of the outer cylinder 21, the fixed seat 22 and the guide blade 23, eliminating the step of manually assembling the guide blade 23 and significantly improving production efficiency. It is understood that in this utility model, the curvature of the first blade segment 231 and the fixed seat 22 can be the same or different, as long as the bending directions of the two are different, and a clearance space 20b is formed at the end of the fixed seat 22 near the fan blade 1111. Therefore, the curvature of the first blade segment 231 and the fixed seat 22 is not specifically limited.

[0028] In the technical solution of this utility model, the guide vane 23 is divided into a first blade segment 231 and a second blade segment 232. One side of the first blade segment 231 is connected to the inner circumferential surface of the outer cylinder 21, and the other side is spaced apart from the fixed seat 22 to form a clearance space 20b. This space avoids the connection overlap between the first blade segment 231 and the fixed seat 22, so that the outer cylinder 21, the fixed seat 22 and the guide vane 23 can be easily demolded after injection molding, eliminating the step of manually assembling the guide vane 23 and improving production efficiency. Meanwhile, the cross-sectional area of ​​the outer periphery of the fixed base 22 gradually increases along the air outlet direction, forming a pressurizing arc surface 22a. The first blade segment 231 is arc-shaped, forming a guide surface, and the cross-sectional area of ​​the air outlet cavity 20a gradually decreases along the air outlet direction. When the airflow enters the air outlet cavity 20a from the fan blade 11, the pressurizing arc surface 22a and the guide surface jointly guide the airflow. Combined with the contraction structure of the air outlet cavity 20a, effective pressurization of the airflow is achieved. At the same time, the arc-shaped guide surface ensures the smooth flow of the airflow, resulting in a good guiding effect. In summary, this air duct pressurization and air outlet equipment 1000, through the integrated molded air outlet duct 20 structure, solves the problem of demolding difficulties and improves production efficiency while taking into account the functions of airflow pressurization and guiding, thus improving the overall performance of the equipment.

[0029] Further, please refer to Figure 5 The curved portion formed by the change in cross-section of the fixed base 22 faces the central axis of the air duct pressurization outlet device 1000. This structure corresponds to the design of the cross-sectional area of ​​the outer periphery of the fixed base 22 gradually increasing along the air outlet direction of the airflow channel. Its curved orientation allows the pressurizing arc surface 22a to better fit the airflow path, achieving pressurization while reserving reasonable space for the first blade segment 231. The curvature direction of the first blade segment 231 is along the circumferential direction of the air duct pressurization outlet device 1000. This directional design ensures that its arc-shaped guide surface can effectively guide the airflow to flow smoothly along the circumference, and also complements the structure of the curved portion of the fixed base 22. Because of the difference between the curvature of the fixed base 22 facing the central axis and the circumferential curvature of the first blade segment 231, the clearance space 20b formed between them gradually increases along the airflow channel from the outlet side to the inlet side. This change in clearance space 20b is adapted to the structure of the air outlet cavity 20a, which gradually decreases in size along the air outlet direction. Without affecting the airflow pressurization and guiding function, it provides a better clearance path for mold demolding, further enhancing the feasibility of one-piece molding and avoiding the demolding difficulties caused by overlapping connections in traditional structures.

[0030] Please see Figure 3 and Figure 4 In one embodiment, the distance between each region of the end face of the first leaf segment 231 facing the pressurized arc surface 22a and the inner circumferential surface of the outer cylinder 21 is equal.

[0031] In this embodiment, the first blade segment 231 is a curved rectangle, ensuring that the distance from each region of the end face of the first blade segment 231 facing the pressurized arc surface 22a to the inner circumferential surface of the outer cylinder 21 is equal. Simultaneously, the curved portion of the fixing seat 22 gradually decreases in size along the air outlet direction, allowing the clearance space 20b between the first blade segment 231 and the fixing seat 22 to maintain a more regular shape as it changes along the airflow channel. Furthermore, this equidistant design of the first blade segment 231 avoids irregular protrusions or depressions in the clearance space 20b caused by fluctuating distances between it and the curved portion of the fixing seat 22. This results in a smoother path for the mold during demolding, further reducing demolding resistance and perfectly meeting the requirements of one-piece molding. In addition, the equidistant relationship between the first blade segment 231 and the inner circumferential surface of the outer cylinder 21 ensures the uniformity of the contraction of the air outlet cavity 20a in the circumferential direction. After the airflow enters the air outlet cavity 20a, it is uniformly compressed in the circumferential direction under the combined action of the pressurizing arc surface 22a of the fixed seat 22 and the guiding surface of the first blade segment 231. This avoids the problem of uneven airflow pressure distribution caused by inconsistent local space contraction, making the pressurization effect more stable and efficient. It also makes the airflow output of the entire duct pressurized air outlet device 1000 more balanced, improving the overall performance of the device.

[0032] Please see Figure 3 and Figure 4 In one embodiment, the length of the end face of the first blade segment 231 near the air inlet side of the airflow channel in the radial direction of the outer cylinder 21 is L1, and the distance between the second blade segment 232 and the inner wall of the outer cylinder 21 in the radial direction of the outer cylinder 21 is L2, where L2 is greater than or equal to L1.

[0033] In this embodiment, the first blade segment 231 is close to the air inlet side, and its radial length L1 determines the initial spatial scale between the air inlet side airflow and the outer cylinder 21 and the fixed seat 22 when the airflow enters the air outlet cavity 20a. The second blade segment 232 is far away from the air inlet side, and its radial length L2 affects the spatial boundary when the airflow flows out of the air outlet side. When L2 equals L1, the radial channel from the second blade segment 232 to the inner wall of the outer cylinder 21 forms a "continuous core-pulling path" with the radial channel corresponding to the first blade segment 231. When the mold core is pulled out along the air outlet direction, the radial space does not shrink in a step-like manner, which can avoid frictional interference between the mold core and the blade segment and the inner wall of the outer cylinder due to the narrowing of the local channel, ensuring smooth demolding. When L2>L1, the radial channel from the second blade segment 232 to the inner wall of the outer cylinder 21 is further "expanded". Compared with the L1 scale on the air inlet side, L2 on the air outlet side forms a "gradually expanding core-pulling space". Even if there are slight dimensional deviations in the blade segment and the inner wall of the outer cylinder due to material shrinkage during the injection molding process, the expanded L2 can still provide sufficient clearance for the mold core, completely eliminating the risk of "narrow end channel jamming the mold core" and further improving the demolding success rate of one-piece molding.

[0034] Please see Figure 3 and Figure 6 In one embodiment, the fan blade 11 includes an inner hub 111, an outer hub 112, at least two first blades 113, and at least two second blades 114. The outer hub 112 is coaxially arranged with the inner hub 111 and is sleeved on the outer periphery of the inner hub 111. An air inlet channel 11a is formed between the outer hub 112 and the inner hub 111. At least two first blades 113 are spaced apart and connected to the outer periphery of the outer hub 112. At least two second blades 114 are spaced apart and disposed in the air inlet channel 11a and connect the outer hub 112 and the inner hub 111. The inner hub 111 is driven to connect to the fan 12. The cross-sectional area of ​​the part of the inner hub 111 near the air inlet end of the airflow channel gradually decreases along the air outlet direction of the airflow channel.

[0035] In this embodiment, the fan blade 11 includes an inner hub 111, an outer hub 112, at least two first blades 113, and at least two second blades 114. By forming an air inlet channel 11a between the coaxially arranged outer hub 112 and inner hub 111, and by arranging multiple first blades 113 around the outer periphery of the outer hub 112, and by arranging multiple second blades 114 around the inner wall of the outer hub 112 and the outer wall of the inner hub 111 to connect the outer hub 112 and the inner hub 111, the fan blade 11 can adopt a combined air outlet form to achieve a better air outlet effect. The first blade 113 can be an axial flow blade or an oblique flow blade, and the second blade 114 can be a centrifugal blade. Since the number of centrifugal blades is not affected by the size of the hub or the hub ratio, it meets the design requirements of small hub and multiple blades, so that the inner hub 111 can adopt a smaller structural design. Therefore, compared with the fan blade 11 which only has axial flow blades, the number of second blades 114 with centrifugal blades can be increased, which is conducive to better increasing the air intake volume of the first fan blade 11. At this time, by forming an air inlet channel 11a between the outer hub 112 and the inner hub 111, the outer hub 112 can guide the airflow turbulent by the second blade 114 under centrifugal force, so that the airflow generated by the second blade 114 is axially discharged along the axial direction of the inner hub 111. At this time, the rotation of the first blade 113 can generate axial or oblique airflow, and the airflow generated by the first blade 113 and the airflow generated by the second blade 114 can be combined and discharged from the air outlet cavity 20a. This allows the fan blade 11 to generate a larger air volume, further increasing the air intake air volume of the duct pressurized air outlet device 1000, which is conducive to better reducing the operating power of the fan 12 and improving the practicality and reliability of the blowing device. Among them, the second blade 114, which adopts the centrifugal blade form, can generate airflow with higher air pressure. By mixing the airflow generated by the first blade 113 and the airflow generated by the second blade 114, the airflow generated by the fan blade 11 can have higher air pressure and flow rate, thus better improving the air outlet effect of the blowing device. Since the linear velocity inside the axial flow blade is lower than that outside, the airflow generated by the axial flow blade has the characteristic of low velocity inside and high velocity outside. Therefore, when the first blade 113 is an axial flow blade, by setting the second blade 114 between the inner hub 111 and the outer hub 112, the airflow generated by the second blade 114 can make up for the deficiency of insufficient linear velocity inside the first blade 113, so that the first fan blade 11 can blow out a more uniform airflow, better achieve the large air volume intake effect of the blower, and further improve the structural stability and reliability of the blower.

[0036] When the duct pressurized air outlet device 1000 is running, ambient air enters the fan blades 11. When the air reaches the part of the inner hub 111 near the air intake end of the airflow channel, because this part of the inner hub 111 near the air intake end of the airflow channel gradually decreases in size along the airflow channel's outlet direction, the corresponding change in structure is that the outer surface of the inner hub 111 near the air intake end of the airflow channel is an inclined straight surface or an arc-shaped surface. At this time, the flow area of ​​the air intake channel decreases linearly, while the fan's intake volume remains unchanged. Thus, the outside air in the air intake channel 11... The first pressurization is achieved; subsequently, the airflow after the first pressurization enters the air outlet cavity 20a along the air inlet channel 11a. After entering the air outlet cavity 20a, the cross-sectional area of ​​the outer periphery of the fixed seat 22 gradually increases along the air outlet direction of the airflow channel, causing the cross-sectional area of ​​the air outlet cavity 20a to gradually decrease along the air outlet direction of the airflow channel. However, the air inlet and outlet volumes of the airflow channel remain unchanged. Therefore, the airflow is pressurized a second time in the air outlet cavity 20a, so that the air duct pressurization and air outlet device 1000 has a high-pressure and high-speed airflow at the outlet end.

[0037] Please see Figure 3 and Figure 6 In one embodiment, the projection of the first blade 113 onto the outer cylinder 21 along the airflow direction of the airflow channel at least partially overlaps with the first blade segment 231 and / or the second blade segment 232.

[0038] In this embodiment, the first blade 113 and the guide blade 23 are aligned along the airflow direction of the airflow channel, meaning that they overlap or correspond to each other on the axial projection of the air duct pressurized air outlet device 1000. When the fan blade 11 rotates, the first blade 113 pushes the airflow to flow axially. Since the first blade 113 and the guide blade 23 are aligned in the axial direction, the airflow pushed by the first blade 113 can flow more directly and smoothly to the guide blade 23, reducing the deviation and diffusion of the airflow during propagation, and allowing the airflow to enter the air outlet cavity 20a enclosed by the guide blade 23 more concentratedly. The guide blade 23 can play a guiding role in time when the airflow arrives, guiding the airflow from the air outlet cavity 20a according to the preset path, avoiding the formation of turbulent vortices between the first blade 113 and the guide blade 23, and reducing the loss of airflow energy. Meanwhile, this alignment design also reduces airflow resistance during transmission, enabling the duct pressurized air outlet 1000 to output a larger air volume and higher air velocity at the same power, thus improving air outlet efficiency. Furthermore, the enhanced airflow stability reduces noise caused by airflow turbulence, improving the user experience of the duct pressurized air outlet 1000 and further enhancing the overall performance of the equipment.

[0039] To optimize the flow direction of the pressurized airflow exiting the inlet duct 11a, please refer to... Figure 3 and Figure 6In one embodiment, the first blade 113 is bent along the first circumferential direction of the outer cylinder 21, and the first blade segment 231 is bent along the second circumferential direction of the outer cylinder 21; the first circumferential direction of the outer cylinder 21 is opposite to the second circumferential direction of the outer cylinder 21.

[0040] In this embodiment, all the first blades 113 are bent along the first circumferential direction. When rotating, they drive the airflow to generate a rotational component along this circumferential direction. The first blade segment 231 is bent along the opposite second circumferential direction, which can guide the rotational component of the airflow in the opposite direction, thus "correcting" the airflow direction. When the airflow flows out from the air inlet channel 11a, the rotational energy it carries is converted into more stable axial flow energy under the action of the reverse bending guide surface of the first blade segment 231. This reduces the airflow dispersion caused by excessive rotation, making the airflow more concentrated and flowing along the preset path of the air outlet cavity 20a, improving the stability of the pressurization effect. Furthermore, this design is combined with the projection overlap structure of the first blades 113 and the first blade segment 231. The overlapping area of ​​the two in the axial projection allows the corrective effect of the reverse bending to act more directly on the airflow pushed by the first blade 113, avoiding the weakening of the corrective effect due to path deviation during the airflow transmission process. Furthermore, the reverse bending of the first blade segment 231 and the pressurizing arc surface 22a of the fixed base 22 form a complementary airflow guiding system—the pressurizing arc surface 22a radially contracts the airflow, while the first blade segment 231 circumferentially corrects the airflow direction, jointly optimizing the airflow posture. This allows the pressurized airflow exiting the air inlet channel 11a to complete the pressurization and discharge process in a more reasonable direction and state after entering the air outlet cavity 20a, further reducing energy loss and improving the overall efficiency of the duct pressurized air outlet device 1000. This structural design also continues the aforementioned pursuit of airflow stability and has a positive effect on reducing eddies and noise.

[0041] Please see Figure 3 and Figure 4 In one embodiment, the distance between the first blade 113 and the first blade segment 231 is L3, and the length of the first blade 113 in the radial direction of the outer cylinder 21 is L4, where L3≤L4.

[0042] In this embodiment, the distance between the first blade 113 and the first blade segment 231 refers to the distance between the side of the first blade 113 facing the air outlet cavity 20a and the side of the first blade segment 231 facing the air inlet channel 11a in the air outlet direction of the airflow channel. The length L4 of the first blade 113 in the radial direction of the outer cylinder 21 refers to the length of the first blade 113 in the air outlet direction of the airflow channel. When the air duct pressurization air outlet device 1000 is a handheld high-speed fan, L3≤L4. The distance between the first blade 113 and the first blade segment 231 is relatively small. This distance is the transition distance of the airflow from the first blade 113 into the air outlet cavity 20a, which can effectively shorten the diffusion time of the airflow in the transmission process. Since handheld fans typically aim for a compact structure, a smaller spacing can prevent energy loss due to excessive diffusion of airflow before it reaches the first blade segment 231. This allows the high-speed airflow from the first blade 113 to enter the guiding range of the first blade segment 231 more quickly, and to act promptly with the guiding surface of the first blade segment 231, which is curved in the opposite circumferential direction, ensuring that the effect of correcting the airflow direction in the opposite direction is not weakened. Meanwhile, the first blade 113 and the guide blade 23 overlap or correspond to each other on the axial projection of the air duct pressurization outlet device 1000. The shorter spacing makes the effective areas of the two more closely connected. The airflow driven by the first blade 113 enters the guide area of ​​the first blade segment 231 before leaving its influence range, forming a "relay" airflow guidance and reducing energy loss in the intermediate links. For the high-speed rotating first blade 113, the generated airflow has strong kinetic energy. The spacing of L3≤L4 allows this kinetic energy to be transferred to the outlet cavity 20a more efficiently. Combined with the tapered structure of the outlet cavity 20a and the pressurizing arc surface 22a of the fixed base 22, the pressurization effect of the airflow is further improved, ensuring that the handheld high-speed fan achieves strong and stable airflow performance in a limited space. In addition, the compact spacing design also helps to reduce the overall size of the device, meeting the portability requirements of handheld devices.

[0043] Further, please refer to Figure 3 and Figure 5 The fixed base 22 includes a first base body 221 and a second base body 222. The second base body 222 is located on the outer peripheral surface of the first base body 221. Each guide vane 23 is disposed on the outer peripheral surface of the second base body 222. The first base body 221 has a bearing support on the side facing the air inlet side of the airflow channel. The bearing support extends toward the air inlet side of the airflow channel. The fan 12 is disposed on the bearing support.

[0044] In this embodiment, the fixed base 22 includes a first base body 221 and a second base body 222, achieving a clear division of functions and optimized structural adaptation. The first base body 221 serves as the core support structure, with its bearing support extending towards the air intake side of the airflow channel, providing a stable mounting foundation for the fan 1212. This ensures that the fan 1212 maintains good coaxiality and stability during high-speed operation, reducing noise and energy loss caused by vibration. The second base body 222 is located on the outer circumference of the first base body 221. It not only connects the guide vanes 2323, but its structure near the air intake side of the airflow channel gradually increases in size along the air outlet direction, making the air outlet cavity 20a20a a tapered structure along the air outlet direction of the airflow channel, thereby achieving a pressurizing effect on the airflow.

[0045] Further, please refer to Figure 2 and Figure 3 The fan 12 includes a fixed shaft 121, an inner stator 122 and an outer rotor 123. The fixed shaft 121 is inserted into the bearing support and connected to the inner hub 111. The inner stator 122 is fixedly sleeved on the outer surface of the bearing support. The outer rotor 123 is rotatably connected to the inner stator 122. The inner hub 111 is fixedly connected to the outer rotor 123.

[0046] In this embodiment, the fan 12 is an external rotor 123 motor, which achieves efficient transmission connection with the fan blades 11 through the structural cooperation of the fixed shaft 121, the inner stator 122, and the external rotor 123. The fixed shaft 121 is inserted into the bearing support of the first base 221 and connected to the inner hub 111, providing stable axial positioning for the entire fan 12. The inner stator 122 is fixedly sleeved on the outer surface of the bearing support, forming the magnetic field foundation as the stationary part of the motor. The external rotor 123 is rotatably connected to the outside of the inner stator 122, achieving rotational motion through electromagnetic induction. Because the inner hub 111 is fixedly connected to the external rotor 123, when the external rotor 123 rotates under the action of electromagnetic force, it can directly drive the inner hub 111 and the entire fan blades 11 to rotate synchronously, reducing energy loss in the transmission process and improving drive efficiency. This structural design makes the connection between the fan 12 and the fan blade 11 more compact, which not only reduces the overall axial dimension, but also reduces the radial runout of the fan blade 11 when it rotates at high speed through the stable support of the bearing support, ensuring the stability of the airflow in the air inlet channel 11a. At the same time, it forms a structural fit with the first seat body 221 and the second seat body 222 of the fixed seat 22, ensuring that the operating heat of the outer rotor 123 motor can be conducted and dissipated to the fixed seat 22 through the bearing support, further improving the operational reliability of the air duct pressurization and air outlet equipment 1000.

[0047] In one embodiment, please refer to Figure 4The plane containing the diameter of the fixed shaft 121 located in the middle of the airflow channel outlet direction is defined as the reference plane. Each first blade segment 231 extends along the circumferential direction of the outer cylinder 21, and the extension end of each first blade segment 231 away from the airflow channel outlet side passes through the reference plane. In this way, all the first blade segments 231 are arranged radially on the outer circumferential surface of the second base 222, which can receive the airflow of different areas. After the airflow exits from the inlet channel 11a, it can quickly enter the guiding area of ​​the radially distributed first blade segments 231 within a tight spacing of L3≤L4. Each first blade segment 231 guides the airflow at its corresponding circumferential position, avoiding local airflow accumulation or insufficient guidance, and ensuring that the airflow is evenly distributed to each outlet cavity 20a in the circumferential direction. Simultaneously, this radial arrangement, combined with the design of the first blade segments 231 bending along the second circumferential direction, not only evenly receives the airflow but also simultaneously corrects the direction of the airflow at different circumferential positions, ensuring that the airflow entering the outlet cavity 20a maintains a consistent flow state overall. This provides a uniform airflow foundation for the subsequent pressurization effect of the outlet cavity 20a, further improving the uniformity and stability of the airflow from the duct pressurization outlet device 1000. Furthermore, the design of the extended end penetrating the reference plane also lengthens the guiding path, allowing the airflow to be more fully guided before entering the outlet cavity 20a, reducing the possibility of airflow turbulence.

[0048] To achieve voltage and current stabilization for fan 12, please refer to... Figure 4 The fan assembly 10 also includes a circuit board that is electrically connected to the fan 12. The first base 221, the second base 222 and the outer rotor 123 of the fan 12 enclose a heat dissipation space 22c. The circuit board is located in the bearing support and within the heat dissipation space 22c. The inner hub 111 is spaced apart from the second base 222 so that the heat dissipation space 22c is connected to the air inlet channel 11a.

[0049] For the fan 12, the voltage and current regulation of its coil is one of its most important properties. The operating state of the coil directly affects the operational stability, output power, and service life of the fan 12. The circuit board plays a crucial role in this process. It can monitor the current and voltage changes of the fan 12 coil in real time and adjust them through internal electronic components to ensure that the coil always operates under stable electrical parameters, avoiding problems such as overheating, unstable speed, or even damage to the fan 12 due to voltage or current fluctuations. However, in the process of realizing real-time control of the fan 12, the circuit board itself also generates heat due to the operation of its electronic components. Especially during continuous high-load operation, if the accumulated heat cannot be dissipated in time, it will affect the performance stability of the electronic components on the circuit board, and may even lead to a decrease in control accuracy and accelerated component aging, thereby affecting the voltage and current regulation effect of the fan 12 coil.

[0050] Based on this, this embodiment constructs an efficient heat dissipation path by placing the circuit board in the heat dissipation space 22c formed between the first base 221 and the second base 222, and by using the inner hub 111 and the second base 222 to be spaced apart along the radial direction of the outer cylinder 21 so that the heat dissipation space 22c is connected to the air inlet channel 11a, effectively solving the heat dissipation problem of the circuit board. Specifically, the circuit board is electrically connected to the fan 12, which can monitor and adjust the current and voltage of the fan 12 coil in real time to ensure its stable voltage and current operation. The heat dissipation space 22c provides an independent installation area for the circuit board, which avoids structural interference with other components and can also achieve heat dissipation by utilizing the airflow of the air inlet channel 11a: when the fan blade 11 rotates, a continuous airflow is generated in the air inlet channel 11a. Some of the airflow can enter the heat dissipation space 22c through the gap between the inner hub 111 and the second base 222, exchange heat with the circuit board, and then be discharged with the main airflow, so as to remove the heat generated by the circuit board during operation in time and prevent its performance from degrading due to high temperature. Meanwhile, the heat dissipation space 22c is enclosed by the first base 221, the second base 222 and the outer rotor 123. The structure has good sealing performance, which can reduce the corrosion of the circuit board by external dust and moisture. With the continuous flow of air, it can not only ensure the heat dissipation efficiency of the circuit board, but also improve the cleanliness of its working environment. This ensures the accuracy of the circuit board in controlling the voltage and flow of the fan 12, extends the service life of the fan 12 and the entire fan assembly 10, and further optimizes the operational stability of the air duct pressurization and air outlet equipment 1000.

[0051] Understandably, the sealing of the circuit board in the heat dissipation space 22c can be achieved by adding a dust filter at the entrance of the heat dissipation space 22c to further prevent the intrusion of foreign objects, ensuring smooth airflow for heat dissipation and maintaining the cleanliness of the circuit board's working environment. In addition, the structural design of the heat dissipation space 22c can adopt a combination of a closed cavity and a guide air duct, allowing the airflow to flow along a preset path across the surface of the circuit board without directly contacting its sensitive components. This achieves efficient heat dissipation while ensuring the sealing and protection of the circuit board, ensuring the long-term stable operation of electronic components in complex environments.

[0052] To ensure that a portion of the airflow in the intake channel 11a can always enter the heat dissipation space 22c, please refer to... Figure 3 , Figure 6 as well as Figure 7 The inner hub 111 extends toward the end of the second seat 222 and extends into the heat dissipation space 22c.

[0053] In this embodiment, the end of the inner hub 111 near the air outlet side of the airflow channel extends toward the second seat 222 along the air outlet direction of the airflow channel, so that the end of the inner hub 111 near the second seat 222 forms an extended straight section 1112. The extended straight section 1112 extends into the heat dissipation space 22c. Since the inner hub 111 and the second seat 222 are spaced apart along the radial direction of the outer cylinder 21, a heat dissipation guiding channel 22d is formed between the extended straight section 1112 and the second seat 222. The heat dissipation guiding channel 22d connects the heat dissipation space 22c and the air inlet channel 11a. At the same time, the heat dissipation guiding channel 22d is aligned with the heat dissipation space 22c along the air outlet direction of the airflow channel. Thus, this structural design, through the deep arrangement of the extended straight section 1112, makes part of the airflow in the air inlet channel 11a continuously constrained in the extended straight section 1112, and flows into the heat dissipation space 22c in a directional manner along the heat dissipation guiding channel 22d, effectively avoiding the problem of interruption of heat dissipation air intake caused by airflow disturbance or pressure fluctuation. Meanwhile, the design of the length of the extended straight section 1112 extending into the heat dissipation space 22c allows for precise control of the length and cross-sectional size of the heat dissipation guide channel 22d according to heat dissipation requirements, ensuring that the airflow entering the heat dissipation space 22c remains stable within a reasonable range—meeting the heat dissipation needs of the circuit board without excessive diversion affecting the main airflow of the outlet air chamber 20a. Furthermore, the heat dissipation guide channel 22d, formed by the extended straight section 1112 and the second base 222, has a regular structure and a fixed path, reducing energy loss during airflow transmission. This allows the cooling airflow to efficiently reach the heat dissipation space 22c and fully exchange heat with the circuit board, further improving heat dissipation efficiency and ensuring the long-term stable operation of the fan 12 under stable voltage and flow conditions.

[0054] Please see Figure 3 and Figure 5 In one embodiment, the bottom wall of the first base 221 is provided with a first wire passage 221a, a guide vane 23 is provided with a wire passage channel, and the outer peripheral surface of the outer cylinder 21 is provided with a second wire passage 21b. The wire passage channel connects the first wire passage 221a and the second wire passage 21b; the first wire passage 221a connects to the heat dissipation space 22c.

[0055] In this embodiment, the wire passage is located inside a guide vane 23, the first wire passage 221a is located on the bottom wall of the first base 221, and the second wire passage 21b is located on the outer circumferential surface of the outer cylinder 21. The guide vane 23 and the second base 222 are fixedly connected. Thus, regardless of vibration or displacement during fan operation, the wire can remain stably threaded through the passage, avoiding electrical connection failure or short circuit risks due to loosening or friction. Furthermore, the first wire passage 221a, located on the bottom wall of the first base 221, directly connects to the heat dissipation space 22c. This allows the wire to not only achieve electrical connection during threading but also receive auxiliary cooling from the airflow within the heat dissipation space 22c. When the fan is running, the airflow entering the heat dissipation space 22c flows through the first wire passage 221a. This process removes the heat generated by the current flowing through the wires, effectively reducing the wire temperature and preventing overheating, aging, or even melting of the insulation layer due to prolonged high-load operation, thereby improving the safety and durability of the electrical system. Furthermore, the connection between the wire passage and the heat dissipation space 22c, and the second wire passage opening 21b located on the outer peripheral wall of the outer cylinder 21, can serve as a heat outlet, ensuring the airflow path of air inlet grille 30 – air inlet channel 11a – heat dissipation space 22c – wire passage. Simultaneously, the orientation of the second wire passage opening 21b on the outer peripheral wall of the outer cylinder 21 and the orientation of the air outlet end of the air outlet cavity 20a form a certain angle, even a 90-degree angle. Thus, the hot airflow from the wire passage will not interfere with or mix with the pressurized airflow from the air outlet cavity 20a, thereby preventing hot air backflow from adversely affecting the temperature, pressure, and directional stability of the outlet airflow.

[0056] To ensure that outside air can enter the air outlet chamber 20a and / or the heat dissipation space 22c, please refer to Figure 3 and Figure 6 The inner hub 111 has a guide arc surface 1111a at the end near the air intake side of the airflow channel, which is configured to guide air to the air outlet chamber 20a.

[0057] In this embodiment, the inner hub 111 has a guide arc section 1111 at its end near the air intake side of the airflow channel. The cross-sectional area of ​​the guide arc section 1111 gradually increases along the direction of the airflow channel from the air intake side to the air outlet side to form a guide arc surface 1111a. Specifically, the guide arc section 1111 is located near the air intake side of the airflow channel, and its cross-sectional area gradually increases along the direction of the air intake side to the air outlet side to form an outwardly expanding guide arc surface 1111a. When outside air enters the air intake channel 11a, the guide arc surface 1111a can guide most of the airflow smoothly to the outer air outlet cavity 20a through the guiding effect of the arc-shaped surface, avoiding the formation of turbulence at the inlet and ensuring a stable airflow in the air outlet cavity 20a.

[0058] Please continue reading. Figure 3 In one embodiment, the guide arc segment 1111 and the extended straight segment 1112 are arranged along the air outlet direction of the airflow channel. The outer peripheral surface of the guide arc segment 1111 is a flat flow-limiting straight surface 1112a. This straight surface does not expand outward and can guide part of the airflow near the central axis of the inner hub 111 in the airflow channel to flow backward along the flow-limiting straight surface 1112a. Finally, it enters the heat dissipation space 22c through the gap between the inner hub 111 and the second seat 222, providing continuous cooling airflow for the circuit board. This collaborative design of "guide arc surface 1111a guiding the outer airflow to the air outlet cavity 20a + flow-limiting straight surface 1112a guiding the inner airflow to the heat dissipation space 22c" not only ensures the main airflow of the air outlet cavity 20a, but also meets the heat dissipation intake requirements of the heat dissipation space 22c. At the same time, the smooth transition between the arc surface and the straight surface reduces airflow resistance, improves the overall airflow efficiency, and further optimizes the operating performance of the air duct pressurization and air outlet device 1000.

[0059] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A duct pressurization and air outlet device, characterized in that, The pressurized air outlet device includes a fan assembly (10) and an air outlet duct (20); the fan assembly (10) includes a fan blade (11) and a fan (12), the fan blade (11) is connected to the fan (12) in a driving manner, the air outlet duct (20) includes an outer duct (21), a fixed seat (22) and a plurality of guide vanes (23), the fan (12) is connected to the fixed seat (22), the fixed seat (22) and the guide vanes (23) are located inside the outer duct (21), each of the guide vanes (23) is located between the outer duct (21) and the fixed seat (22), and any two adjacent guide vanes (23) together with the fixed seat (22) and the outer duct (21) form an air outlet cavity (20a); The cross-sectional area of ​​the outer periphery of the fixed seat (22) gradually increases along the air outlet direction of the air duct pressurized air outlet device, so that the outer periphery of the fixed seat (22) forms a pressurized arc surface (22a). The guide vane (23) includes a first blade segment (231) and a second blade segment (232) arranged along the air outlet direction of the air duct pressurized air outlet device. The first blade segment (231) is arc-shaped to form a guide surface. The second blade segment (232) is a straight section along the air outlet direction of the air duct pressurized air outlet device. The two sides of the second blade segment (232) are respectively connected to the inner periphery of the outer cylinder (21) and the pressurized arc surface (22a). One side of the first blade segment (231) is connected to the inner periphery of the outer cylinder (21). The other side of the first blade segment (231) is spaced apart from the fixed seat (22) so that a clearance space (20b) is formed between the first blade segment (231) and the fixed seat (22) near the end of the fan blade (11). The cross-sectional area of ​​the air outlet cavity (20a) gradually decreases along the air outlet direction of the pressurized air outlet device in the air duct, and the pressurized arc surface (22a) and the guide surface are configured to guide the airflow into the air outlet cavity (20a).

2. The duct pressurization and air outlet device as described in claim 1, characterized in that, The first leaf segment (231) has a length of L1 in the radial direction of the outer cylinder (21), and the second leaf segment (232) has a distance of L2 from the inner wall of the outer cylinder (21) in the radial direction of the outer cylinder (21), where L2 is greater than or equal to L1.

3. The duct pressurization and air outlet device as described in any one of claims 1 or 2, characterized in that, The fan blade (11) includes an inner hub (111), an outer hub (112), at least two first blades (113) and at least two second blades (114). The outer hub (112) is coaxially arranged with the inner hub (111) and sleeved on the outer periphery of the inner hub (111). An air inlet channel (11a) is formed between the outer hub (112) and the inner hub (111), and the air inlet channel (11a) is connected to the air outlet cavity (20a). At least two first blades (113) are spaced apart and connected to the outer periphery of the outer hub (112). At least two second blades (114) are spaced apart and disposed in the air inlet channel (11a) and connected to the outer hub (112) and the inner hub (111). The inner hub (111) is connected to the fan (12) via a drive.

4. The duct pressurization and air outlet device as described in claim 3, characterized in that, The cross-sectional area of ​​the portion of the inner hub (111) near the air inlet end of the air duct pressurization and air outlet device gradually decreases along the air outlet direction of the air duct pressurization and air outlet device.

5. The duct pressurization and air outlet device as described in claim 3, characterized in that, The projection of the first blade (113) on the outer cylinder (21) along the air outlet direction of the pressurized air outlet device in the air duct at least partially overlaps with the first blade segment (231) and / or the second blade segment (232).

6. The duct pressurization and air outlet device as described in claim 3, characterized in that, The first blade (113) is bent along the first circumferential direction of the outer cylinder (21), and the first blade segment (231) is bent along the second circumferential direction of the outer cylinder (21); the first circumferential direction of the outer cylinder (21) is opposite to the second circumferential direction of the outer cylinder (21).

7. The duct pressurization and air outlet device as described in claim 3, characterized in that, The fixed base (22) includes a first base body (221) and a second base body (222). The second base body (222) is located on the outer peripheral surface of the first base body (221), and each of the guide vanes (23) is disposed on the outer peripheral surface of the second base body (222). The first base body (221) has a bearing support on the side facing the air inlet end of the air duct pressurization and air outlet device. The bearing support extends toward the air inlet end of the air duct pressurization and air outlet device, and the fan (12) is disposed on the bearing support.

8. The duct pressurization and air outlet device as described in claim 7, characterized in that, The cross-sectional area of ​​the second seat (222) gradually increases along the air outlet direction of the air duct pressurization outlet device, so that the outer peripheral surface of the second seat (222) forms the pressurization arc surface (22a).

9. The duct pressurization and air outlet device as described in claim 7, characterized in that, The fan assembly (10) also includes a circuit board (13), which is electrically connected to the fan (12); the first base (221), the second base (222) and the fan (12) enclose a heat dissipation space (22c), and the circuit board (13) is disposed on the bearing support and located in the heat dissipation space (22c); the inner hub (111) is spaced apart from the second base (222) so that the heat dissipation space (22c) is connected to the air inlet channel (11a).

10. The duct pressurization and air outlet device as described in claim 9, characterized in that, The bottom wall of the first base (221) is provided with a first wire passage (221a), a guide vane (23) is provided with a wire passage channel, and the outer peripheral surface of the outer cylinder (21) is provided with a second wire passage (21b). The wire passage connects the first wire passage (221a) and the second wire passage (21b); the first wire passage (221a) connects to the heat dissipation space (22c).

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