A new fan structure and axial flow fan

Abstract

The utility model discloses a novel fan structure and axial flow fan, wherein, the novel fan structure includes: outer frame, wind wheel, main shaft, bearing and elastic structure, and the middle of outer frame has the extension of hollow cavity, wind wheel is located in the outer frame, and the middle of wind wheel has fixed part, main shaft has fixed end and free end, and fixed end is assembled in fixed part, and free end partially exposes the extension, bearing is assembled on main shaft, and main shaft is rotatably connected with the inner wall of the extension of outer frame through bearing, and bearing has track groove and ball in it, bearing has elastic structure between outer frame or wind wheel, and elastic structure is used for abutting the side of bearing close to ball, to provide axial pre -pressure to ball, and make ball limit in track groove. The technical scheme of the utility model can reduce the back and forth swing of fan blade along the length direction of main shaft when high -speed rotation, is favorable for reducing the noise produced when fan blade high -speed rotation, and promotes user experience.

Description

Technical Field

[0001] This utility model relates to a fan device, and more particularly to a novel fan structure and axial flow fan. Background Technology

[0002] Most fans in daily life are axial fans. Their blades guide airflow from the back of the fan, accelerate it, and then expel it from the front, achieving axial airflow. Because the blade edges are curved, the airflow is cut at different speeds at different points along the edge, resulting in uneven force distribution. This causes the fan blades to wobble at high speeds, affecting their rotational stability. In related technologies, bearings can be installed on the main shaft driving the blades. These bearings have inner and outer wheels and ball bearings between them. However, due to the misalignment between the inner and outer wheels, the ball bearings can easily deviate from their grooves, failing to reduce the wobble, especially at high speeds, which exacerbates the wobble and generates noise, affecting user experience.

[0003] Therefore, it is necessary to further improve the structure of axial fans. Utility Model Content

[0004] The main purpose of this utility model is to propose a new fan structure and axial flow fan, which aims to solve the technical problem in the related technology that the bearing set on the main shaft of the fan cannot reduce the shaking caused by the high-speed rotation of the fan blades due to the deviation between the inner and outer wheels, resulting in poor overall stability and high noise when the fan blades rotate at high speed.

[0005] To achieve the above objectives, this utility model proposes a novel fan structure, comprising:

[0006] The outer frame has a hollow cavity protruding part in the middle;

[0007] The wind turbine is located inside the outer frame and has a fixed part in the middle.

[0008] A spindle having a fixed end and a free end, the fixed end being assembled to a fixed part, and the free end being partially exposed and extended for connecting to a drive motor;

[0009] The bearing is mounted on the main shaft, and the main shaft is rotatably connected to the inner wall of the protrusion of the outer frame through the bearing, so that the impeller and the outer frame are adapted to rotate. The bearing has a track groove and balls.

[0010] The bearing and the outer frame have an elastic structure that abuts against the side of the bearing closest to the balls to provide axial preload to the balls and confine them within the raceway groove; or

[0011] The bearing and the impeller have an elastic structure that abuts against the side of the bearing near the ball to provide axial preload to the ball and confine the ball within the track groove.

[0012] Optionally, the elastic structure is a wave spring, a conical spring, or a spring sheet.

[0013] Optionally, the spring is a single-layer annular spring, the annular spring including at least one protruding segment, and adjacent protruding segments are spaced apart.

[0014] Optionally, the annular spring sheet further includes at least one recessed section, wherein the protruding section and the recessed section are connected on the same side of the annular spring sheet.

[0015] Optionally, the spring sheet includes at least two stacked annular spring sheets, each annular spring sheet including at least one protruding segment and a recessed segment, adjacent protruding segments are connected by the recessed segment, the protruding segments in adjacent annular spring sheet layers are staggered, and the recessed segments in adjacent annular spring sheet layers are staggered.

[0016] Optionally, the bearing includes a first bearing and a second bearing, wherein the first bearing is disposed near the free end of the main shaft and the second bearing is disposed near the fixed end of the main shaft;

[0017] The elastic structure includes a first elastic structure and a second elastic structure. The first elastic structure is located between the first bearing and the outer frame. The inner wall of the protruding part of the outer frame is provided with a first abutting edge. One end of the first elastic structure abuts against the first abutting edge, and the other end abuts against the outer wall of the first bearing near the ball.

[0018] The second elastic structure is located between the second bearing and the outer frame. The inner wall of the protruding part of the outer frame is provided with a second abutting edge. One end of the second elastic structure abuts against the second abutting edge, and the other end abuts against the outer wall of the second bearing near the ball.

[0019] Optionally, the bearing includes a first bearing and a second bearing, wherein the first bearing is disposed near the free end of the main shaft and the second bearing is disposed near the fixed end of the main shaft;

[0020] The elastic structure includes a first elastic structure and a second elastic structure. The first elastic structure is located between the first bearing and the outer frame. The inner wall of the protruding part of the outer frame is provided with a first abutting edge. One end of the first elastic structure abuts against the first abutting edge, and the other end abuts against the outer wall of the first bearing near the ball.

[0021] The second elastic structure is located between the second bearing and the wind turbine. One end of the second elastic structure abuts against the inner wall of the wind turbine, and the other end abuts against the outer wall of the second bearing near the ball bearing.

[0022] Optionally, it also includes an inner shell, an annular shock-absorbing pad, and a fixed bracket. The middle of the wind turbine has a mounting groove on the side near the outer frame. The inner shell, annular shock-absorbing pad, and fixed bracket are respectively sleeved on the outer wall of the protruding part of the outer frame and located in the mounting groove. The inner shell, annular shock-absorbing pad, and fixed bracket are distributed sequentially from the outside to the inside.

[0023] Optionally, the fixed support includes a first support, a second support, and a third support, which are distributed sequentially along the length of the extended portion of the outer frame, with the first support located close to the outer frame and the third support located close to the wind turbine.

[0024] To achieve the above objectives, this utility model proposes an axial flow fan, including the novel fan structure described above.

[0025] The novel fan structure of this utility model mainly includes a fan wheel, an outer frame, a bearing, a main shaft, and an elastic structure. The fan wheel is rotatably connected to the outer frame via the bearing. The elastic structure is disposed between the fan wheel and the bearing, or between the outer frame and the bearing. The elastic structure abuts against the side of the bearing closest to the ball bearing, confining the ball bearing within the track groove and preventing it from deviating from the track groove. It also provides continuous axial preload to the ball bearing, ensuring uniform force distribution and reducing or even eliminating bearing vibration and noise caused by the gap between the inner and outer wheels. When the fan blades rotate, the stable movement of the ball bearing within the track groove and the stable position of the main shaft reduce the back-and-forth swaying along the length of the main shaft during high-speed fan blade rotation, thus reducing noise generated during high-speed fan blade rotation and improving the user experience. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the novel fan structure of this utility model;

[0028] Figure 2 This is a cross-sectional view of an embodiment of the novel fan structure of this utility model (the elastic structure is located between the second bearing and the outer frame);

[0029] Figure 3 This is a cross-sectional view of an embodiment of the novel fan structure of this utility model (the elastic structure is located between the first bearing and the outer frame);

[0030] Figure 4This is a cross-sectional view of an embodiment of the novel fan structure of this utility model (the elastic structure is located between the second bearing and the impeller);

[0031] Figure 5 This is an exploded view of an embodiment of the novel fan structure of this utility model.

[0032] Figure 6 This is an exploded view of another embodiment of the novel fan structure of this utility model;

[0033] Figure 7 This is a schematic diagram of the elastic structure in one embodiment of the novel fan structure of this utility model;

[0034] Label Explanation:

[0035] 100. Outer frame:

[0036] 110. Frame; 120. Support; 130. Connecting arm; 140. Extension; 141. First abutting edge; 142. Second abutting edge; 150. Accommodating space.

[0037] 200. Windmill:

[0038] 210. Fan blade; 220. Hub; 230. Mounting part; 240. Mounting slot;

[0039] 300, spindle; 310, free end; 320, fixed end;

[0040] 400, bearing; 410, first bearing; 420, second bearing; 430, ball bearing;

[0041] 500, elastic structure; 501, first elastic structure; 502, second elastic structure; 510, first spring piece; 520, second spring piece; 511, protruding section; 512, recessed section.

[0042] 610 Inner shell, 620 Annular shock-absorbing pad, 630 Fixed bracket, 631 First bracket, 632 Second bracket, 633 Third bracket, 640 PCB board.

[0043] 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

[0044] 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 protection scope of the present utility model.

[0045] 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 certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0046] 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 meaning of "and / or" throughout the text is to include three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. 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.

[0047] Unlike related technologies where bearings are mounted on the fan's main shaft, the misalignment between the inner and outer wheels fails to mitigate the vibration caused by the high-speed rotation of the fan blades, resulting in poor overall stability and high noise levels. This invention provides a novel fan structure designed to reduce overall fan blade vibration during high-speed rotation, lower noise, and improve the user experience. The specific structure of this novel fan is described in the following embodiment.

[0048] This invention proposes a novel fan structure for use in axial flow fans, which reduces the overall back-and-forth swaying of the fan blades when they rotate at high speed, thus ensuring the stability of the fan blades during operation.

[0049] In the embodiments of this utility model, such as Figures 1 to 7 As shown, Figure 1 This is a schematic diagram of the overall structure of an embodiment of the novel fan structure of this utility model; Figure 2 This is a cross-sectional view of an embodiment of the novel fan structure of this utility model (the elastic structure is located between the second bearing and the outer frame); Figure 3 This is a cross-sectional view of an embodiment of the novel fan structure of this utility model (the elastic structure is located between the first bearing and the outer frame); Figure 4 This is a cross-sectional view of an embodiment of the novel fan structure of this utility model (the elastic structure is located between the second bearing and the impeller); Figure 5 This is an exploded view of an embodiment of the novel fan structure of this utility model. Figure 6 This is an exploded view of another embodiment of the novel fan structure of this utility model; Figure 7 This is a schematic diagram of the elastic structure in one embodiment of the novel fan structure of this utility model. The novel fan structure includes:

[0050] The outer frame 100 has a hollow cavity protrusion in the middle. The outer frame 100 includes a frame body 110 and a support portion 120 located in the middle of the frame body 110. The support portion 120 is connected to the frame body 110 via multiple connecting arms 130. In this design, there are four connecting arms 130. The support portion 120 in the middle of the outer frame 100 has a tubular protrusion 140 extending rearward. The diameter of this protrusion 140 decreases progressively outward from the outer frame 100. The rear side of the outer frame 100 has an accommodating space 150 for assembling the wind turbine 200.

[0051] The impeller 200 is located within the outer frame 100 and has a fixing part 230 in the middle. The impeller 200 includes a hub 220 and multiple fan blades 210 disposed on the outer side of the hub 220. The fan blades 210 are evenly distributed on the outer side of the hub 220, and each fan blade 210 is obliquely disposed on the outer side of the hub 220. The number of fan blades 210 can be set according to actual requirements, for example, 7-11 blades, and is not limited here. It is understood that when there are more fan blades 210 disposed on the outer side of the hub 220, the airflow can pass more smoothly through the fan blades 210, the back-and-forth swaying amplitude of the fan blades 210 at high speed is smaller, and the noise is also lower. The aforementioned fixing part 230 is used to connect with the fixed end 320 of the main shaft 300. Notches can be provided on the edges of the fan blades 210 to facilitate smooth airflow.

[0052] The main shaft 300 has a fixed end 320 and a free end 310. The fixed end 320 is fitted to the fixing part 230 of the impeller 200, and the free end 310 is partially exposed in the protrusion 140 for connecting to a drive motor. Specifically, the fixed end 320 of the main shaft 300 has at least one notch, and the fixing part 230 of the impeller 200 has a limiting rib that can extend into the notch to fix the main shaft 300 to the impeller 200.

[0053] A bearing 400 is mounted on a main shaft 300. The main shaft 300 is rotatably connected to the inner wall of the protrusion 140 of the outer frame 100 via the bearing 400, allowing the impeller 200 to rotate in adaptation with the outer frame 100. The bearing 400 has a track groove and multiple balls 430. The bearing 400 also includes an outer wheel and an inner wheel. The outer circumference of the inner wheel has a track groove. When the outer wheel and the inner wheel are engaged, each ball 430 is located within the track groove. Due to dimensional discrepancies between the inner and outer wheels, the balls 430 may easily deviate from the track groove when moving within it. In this case, an elastic structure 500 can be used in conjunction with the bearing 430. The elastic structure 500 can support one side of the ball 430, preventing the ball 430 from dislodging from the track groove.

[0054] The bearing 400 and the outer frame 100 have an elastic structure 500, which abuts against the side of the bearing 400 near the ball 430 to provide axial preload to the ball 430 and confine the ball 430 within the track groove; or

[0055] An elastic structure 500 is provided between the bearing 400 and the impeller 200. The elastic structure 500 is used to abut against the side of the bearing 400 near the ball 430 to provide axial preload to the ball 430 and confine the ball 430 within the track groove. One end of the elastic structure 500 can abut against the side of the bearing 400 near the ball 430, and the other end can abut against the outer frame 100 or the impeller 200. Because the elastic structure 500 can abut against the side of the bearing 400 near the ball 430, it can compress and limit the position of the ball 430, confining it within the track groove, thus ensuring a more stable movement trajectory for the ball 430. By compressing the side of the bearing 400 near the ball 430, the elastic structure 500 provides axial preload to each ball 430, making the force on each ball more even. This reduces or even eliminates bearing wobble and noise caused by the gap between the inner and outer wheels, helping to ensure the stability of the bearing 400 during operation. This, in turn, improves the overall smoothness of the fan blade 210 during high-speed rotation, reducing the back-and-forth wobble of the fan blade 210 and lowering noise. Furthermore, when the ball 430 wears, the elastic structure 500, by holding the bearing 400 against the side near the ball 430, prevents the ball 430 from falling out of the track groove, extending the service life of the bearing 400.

[0056] In one specific embodiment, the elastic structure 500 is a wave spring, a conical spring, or a spring sheet. A wave spring is a common spring with a uniform outer diameter. Wave springs provide relatively small elastic forces, and to increase the elastic force, the length of the wave spring must be increased, resulting in a larger size. A conical spring is similar to a common spring, but it avoids interference between adjacent spring coils. Using a spring sheet can shorten the size of the elastic structure 500; this size is the thickness of the annular spring sheet. This spring sheet can be a strip-shaped spring sheet, an arc-shaped spring sheet, an annular spring sheet, or an irregularly shaped spring sheet; the specific shape can be designed according to actual requirements.

[0057] In one embodiment, the spring is a single-layer annular spring, which includes at least one protruding segment 511, with adjacent protruding segments 511 spaced apart. There are multiple protruding segments 511, spaced apart, so that when the spring abuts against the outer side of the bearing 400, the protruding segments 511 can press tightly against the outer side of the bearing 400. With multiple protruding segments 511, they can simultaneously press tightly against the outer side of the bearing 400 near the ball 430, making the force on the ball 430 more uniform and the bearing 400 more stable in operation. Furthermore, the annular spring also includes at least one recessed segment 512, with the protruding segment 511 and the recessed segment 512 connected on the same side of the annular spring. To improve the elastic deformation capability, the annular spring can also have a recessed segment 512 connected to the protruding segment 511. Understandably, the recessed segment 512 and the raised segment 511 are features exhibited on the same side of the annular spring. On the other side of the annular spring, the recessed segment 512 and the raised segment 511 exhibit opposite features; that is, the recessed segment 512 corresponds to the raised segment 511, and the raised segment 511 corresponds to the recessed segment 512, which can abut against the outer frame 100 or the impeller 200. By setting the recessed segment 512, the elastic force is approximately doubled based on the elastic deformation force of the raised segment 511.

[0058] Please refer to Figure 7In one specific embodiment, the spring sheet includes at least two stacked annular spring sheets. Each annular spring sheet includes at least one protruding segment 511 and a recessed segment 512. Adjacent protruding segments 511 are connected by recessed segments 512. The protruding segments 511 in adjacent annular spring sheet layers are staggered, and the recessed segments 512 in adjacent annular spring sheet layers are staggered. Multiple annular spring sheet layers can be provided according to the actual elastic deformation force requirements. Each annular spring sheet layer has the same or similar structure, and adjacent annular spring sheet layers are stacked and welded together. When adjacent annular spring sheet layers are stacked, the protruding segments 511 and recessed segments 512 of adjacent annular spring sheet layers need to be staggered. Preferably, the adjacent annular springs are a first spring 510 and a second spring 520, with the protruding section 511 of the first spring 510 and the recessed section of the second spring 520 correspondingly arranged to maximize the elastic deformation of the springs with minimal thickness.

[0059] Please refer to Figures 2 to 4 In one specific embodiment, the bearing 400 includes a first bearing 410 and a second bearing 420. The first bearing 410 is disposed near the free end 310 of the main shaft 300, and the second bearing 420 is disposed near the fixed end 320 of the main shaft 300.

[0060] The elastic structure 500 includes a first elastic structure 501 and a second elastic structure 502. The first elastic structure 501 is located between the first bearing 410 and the outer frame 100. The inner wall of the protrusion 140 of the outer frame 100 is provided with a first abutting edge 141. One end of the first elastic structure 501 abuts against the first abutting edge 141, and the other end abuts against the outer wall of the first bearing 410 near the ball 430.

[0061] The second elastic structure 502 is located between the second bearing 420 and the outer frame 100. The inner wall of the protrusion 140 of the outer frame 100 is provided with a second abutment edge 142. One end of the second elastic structure 502 abuts against the second abutment edge 142, and the other end abuts against the outer wall of the second bearing 420 near the ball bearing 430. By setting two bearings 400 of the same size and shape, the main shaft 300 moves at the axial position of the two bearings 400, making the position of the main shaft 300 more stable. Correspondingly, the back-and-forth sway amplitude is smaller when the fan rotates at high speed. When there are two bearings 400, two elastic structures 500 are required. The two elastic structures 500 can be selected from wave springs, conical springs, or sheet springs, and two identical or different schemes can be chosen. Considering minimizing the length of the main shaft 300 occupied, both the first elastic structure 501 and the second elastic structure 502 can be sheet springs.

[0062] Please refer to Figures 2 to 4In one parallel arrangement, the bearing 400 includes a first bearing 410 and a second bearing 420. The first bearing 410 is disposed near the free end 310 of the main shaft 300, and the second bearing 420 is disposed near the fixed end 320 of the main shaft 300.

[0063] The elastic structure 500 includes a first elastic structure 501 and a second elastic structure 502. The first elastic structure 501 is located between the first bearing 410 and the outer frame 100. The inner wall of the protrusion 140 of the outer frame 100 is provided with a first abutting edge 141. One end of the first elastic structure 501 abuts against the first abutting edge 141, and the other end abuts against the outer wall of the first bearing 410 near the ball 430.

[0064] The second elastic structure 502 is located between the second bearing 420 and the impeller 200. One end of the second elastic structure 502 abuts against the inner wall of the impeller 200, and the other end abuts against the outer wall of the second bearing 420 near the ball bearing 430. When two bearings 400 are provided, two corresponding elastic structures 500 are required. The two elastic structures 500 can be any two identical or different designs from wave springs, conical springs, or sheet springs. Considering minimizing the length occupied by the main shaft 300, both the first elastic structure 501 and the second elastic structure 502 can be sheet springs.

[0065] The difference between the two solutions is that the contact position of one end of the second elastic structure 502 is different. Understandably, elastic structures 500 can be provided on both sides of the first bearing 410 and the second bearing 420. In practical applications, one side of the first bearing 410 and the second bearing 420 can be closed, leaving the other side exposed for mounting the ball bearing 430, thus saving costs.

[0066] Please refer to Figure 5 and Figure 6 In one specific embodiment, the device further includes an inner shell 610, an annular damping pad 620, and a fixing bracket 630. The impeller 200 has a mounting groove 240 on the side near the outer frame 100. The inner shell 610, the annular damping pad 620, and the fixing bracket 630 are respectively fitted onto the outer wall of the protruding portion 140 of the outer frame 100 and located within the mounting groove 240. The inner shell 610, the annular damping pad 620, and the fixing bracket 630 are distributed sequentially from the outside to the inside. The annular damping pad 620 is arranged around the fixing bracket. A sound-absorbing ring can also be added to the annular damping pad 620 to further reduce noise. The inner shell 610 can accommodate the annular damping pad 620, preventing it from protruding outside the device and thus protecting the annular damping pad 620.

[0067] Please refer to Figure 5 and Figure 6Specifically, the fixed bracket 630 includes a first bracket 631, a second bracket 632, and a third bracket 633. These brackets are sequentially distributed along the length of the protruding portion 140 of the outer frame 100, with the first bracket 631 positioned close to the outer frame 100 and the third bracket 633 positioned close to the impeller 200. The first bracket 631, second bracket 632, and third bracket 633 are connected by slots, allowing for easy disassembly and assembly simply by pulling them out or inserting them. Additionally, a circular PCB board 640 is positioned near the outer frame 100 on the first bracket 631. This PCB board 640 is fitted onto the protruding portion 140 and can be electrically connected to the drive motor to control its operating power.

[0068] In the embodiments of this utility model, the axial fan includes the novel fan structure described above. The specific structure of the axial fan is described in the embodiments of the novel fan structure described above, and will not be repeated here. Since the axial fan of this solution adopts all the technical solutions of all embodiments of the novel fan structure described above, it possesses at least all the advantages and beneficial effects brought about by the technical solutions of the embodiments of the novel fan structure described above, and will not be repeated here.

[0069] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A novel fan structure, characterized in that, The novel fan structure includes: The outer frame has a hollow cavity protruding part in the middle; The wind turbine is located inside the outer frame and has a fixed part in the middle. A spindle having a fixed end and a free end, the fixed end being assembled to a fixed part, and the free end being partially exposed and extended for connecting to a drive motor; The bearing is mounted on the main shaft, and the main shaft is rotatably connected to the inner wall of the protrusion of the outer frame through the bearing, so that the impeller and the outer frame are adapted to rotate. The bearing has a track groove and balls. The bearing and the outer frame have an elastic structure that abuts against the side of the bearing closest to the balls to provide axial preload to the balls and confine them within the raceway groove; or The bearing and the impeller have an elastic structure that abuts against the side of the bearing near the ball to provide axial preload to the ball and confine the ball within the track groove.

2. The novel fan structure as described in claim 1, characterized in that, The elastic structure is a wave spring, a conical spring, or a spring sheet.

3. The novel fan structure as described in claim 2, characterized in that, The spring is a single-layer annular spring, and the annular spring includes at least one protruding segment, with adjacent protruding segments spaced apart.

4. The novel fan structure as described in claim 3, characterized in that, The annular spring sheet also includes at least one recessed section, and the protruding section and the recessed section are connected on the same side of the annular spring sheet.

5. The novel fan structure as described in claim 2, characterized in that, The spring sheet includes at least two stacked annular spring sheets. Each annular spring sheet includes at least one protruding section and one recessed section. Adjacent protruding sections are connected by recessed sections. The protruding sections in adjacent annular spring sheet layers are staggered, and the recessed sections in adjacent annular spring sheet layers are staggered.

6. The novel fan structure as described in claim 1, characterized in that, The bearing includes a first bearing and a second bearing, wherein the first bearing is disposed near the free end of the main shaft and the second bearing is disposed near the fixed end of the main shaft; The elastic structure includes a first elastic structure and a second elastic structure. The first elastic structure is located between the first bearing and the outer frame. The inner wall of the protruding part of the outer frame is provided with a first abutting edge. One end of the first elastic structure abuts against the first abutting edge, and the other end abuts against the outer wall of the first bearing near the ball. The second elastic structure is located between the second bearing and the outer frame. The inner wall of the protruding part of the outer frame is provided with a second abutting edge. One end of the second elastic structure abuts against the second abutting edge, and the other end abuts against the outer wall of the second bearing near the ball.

7. The novel fan structure as described in claim 1, characterized in that, The bearing includes a first bearing and a second bearing, wherein the first bearing is disposed near the free end of the main shaft and the second bearing is disposed near the fixed end of the main shaft; The elastic structure includes a first elastic structure and a second elastic structure. The first elastic structure is located between the first bearing and the outer frame. The inner wall of the protruding part of the outer frame is provided with a first abutting edge. One end of the first elastic structure abuts against the first abutting edge, and the other end abuts against the outer wall of the first bearing near the ball. The second elastic structure is located between the second bearing and the wind turbine. One end of the second elastic structure abuts against the inner wall of the wind turbine, and the other end abuts against the outer wall of the second bearing near the ball bearing.

8. The novel fan structure as described in claim 1, characterized in that, It also includes an inner shell, an annular shock-absorbing pad, and a fixed bracket. The wind turbine has a mounting groove on the side near the outer frame. The inner shell, annular shock-absorbing pad, and fixed bracket are respectively fitted onto the outer wall of the protruding part of the outer frame and located in the mounting groove. The inner shell, annular shock-absorbing pad, and fixed bracket are distributed sequentially from the outside to the inside.

9. The novel fan structure as described in claim 8, characterized in that, The fixed support includes a first support, a second support, and a third support. The first support, the second support, and the third support are distributed sequentially along the length of the extended portion of the outer frame, with the first support located close to the outer frame and the third support located close to the wind turbine.

10. An axial flow fan, characterized in that, The axial fan includes the novel fan structure as described in any one of claims 1 to 9.

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