Axial flow fan

Abstract

The utility model relates to the technical field of fans, in particular to an axial flow fan which comprises a mounting bracket, a current collector, an air guide ring and a wind wheel, and the wind wheel is rotationally arranged on the mounting bracket; the first end of the air guide ring is fixedly connected with the mounting support, the air guide ring and the wind wheel are coaxially arranged, and the wind wheel is located in the air guide ring. An air outlet port of the current collector is inserted into the wind wheel, a first connecting part is arranged on the outer edge of an air inlet port of the current collector, and the first connecting part is arranged in the circumferential direction of the current collector; a second connecting part is arranged on the outer edge of the second end of the air guide ring, and the second connecting part is arranged in the circumferential direction of the air guide ring; a telescopic adjusting mechanism is arranged between the first connecting part and the second connecting part, the telescopic adjusting mechanism is fixed to the second connecting part in the axial direction of the air guide ring, and the telescopic end of the telescopic adjusting mechanism is connected with the first connecting part, so that the current collector can move relative to the wind wheel in the axial direction of the wind wheel; therefore, the sleeving depth between the current collector and the wind wheel can be adjusted, and vortex noise is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to an axial flow fan. Background Technology

[0002] An axial flow fan is a type of fan where the airflow direction is the same as the axis of the blades. During operation, the airflow enters the impeller through the collector, is propelled by the blades, increasing the gas energy. The blades then deflect the airflow into an axial flow, which finally flows through the guide ring and is output along the blade axis. In axial flow fans, the connection depth between the collector and the impeller significantly affects the aerodynamic characteristics and noise. This is because the connection depth determines the flow path and state of the airflow as it enters the impeller. A suitable connection depth ensures smooth and uniform airflow into the impeller, reducing the formation of eddies and turbulence, thus improving the fan's aerodynamic efficiency. Conversely, an improper connection depth can lead to backflow, vortices, and other undesirable flow phenomena between the collector and the impeller, increasing flow resistance and reducing aerodynamic performance.

[0003] However, in the prior art, in a fan and air conditioning device disclosed in patent publication number CN115450951A, the outer ring of its third housing is fixed to the stationary guide portion by bolts or screws. Here, the rotating part is equivalent to the impeller, the outer ring of the third housing is equivalent to the fan's collector, and the stationary guide portion is equivalent to the fan's guide ring. That is, in the aforementioned prior art fan, the collector is fixed to the guide ring by bolts or screws, resulting in the fitting depth between the collector and the impeller being non-adjustable.

[0004] In summary, there is an urgent need to propose an axial flow fan with adjustable connection depth between the collector and the impeller. Utility Model Content

[0005] One of the objectives of this utility model is to provide an axial flow fan that solves the technical problem that the connection depth between the collector and the impeller of existing axial flow fans is not adjustable.

[0006] To achieve the above objectives, this utility model provides an axial flow fan, including a mounting bracket, a collector, an air guide ring, and an impeller. The impeller is rotatably mounted on the mounting bracket. A first end of the air guide ring is fixedly connected to the mounting bracket, and the impeller is located within the air guide ring, with both coaxially arranged. The outlet port of the collector is inserted into the impeller, and a first connecting portion is provided on the outer edge of the inlet port of the collector, the first connecting portion being arranged circumferentially along the collector. A second connecting portion is provided on the outer edge of the second end of the air guide ring, the second connecting portion being arranged circumferentially along the air guide ring. Multiple telescopic adjustment mechanisms are provided between the first and second connecting portions, the multiple telescopic adjustment mechanisms being arranged circumferentially along the air guide ring, and the telescopic adjustment mechanisms being arranged axially along the air guide ring on the second connecting portion. The telescopic ends of the telescopic adjustment mechanisms are connected to the first connecting portion.

[0007] Furthermore, the telescopic adjustment mechanism includes a connecting stud, a first locking nut, and a second locking nut. The connecting stud is connected to the first connecting part, and the connecting stud is threaded through the second connecting part. The first locking nut and the second locking nut are both threadedly connected to the connecting stud. The first locking nut is located between the second connecting part and the first connecting part, and the second locking nut is located on the side of the second connecting part facing away from the first connecting part.

[0008] Furthermore, the inner diameter of the air inlet port of the air guide ring is smaller than the inner diameter of the air outlet port of the air guide ring.

[0009] Furthermore, the wind turbine includes a hub, a centrifugal ring, and multiple blades. The blade roots of the multiple blades are connected and fixed to the outer wall of the hub. The multiple blades are evenly arranged along the circumference of the hub. The blade tips of the multiple blades are all connected and fixed to the inner wall of the centrifugal ring. The centrifugal ring is located around the multiple blades. The air outlet port of the collector is inserted into the centrifugal ring. The hub is driven and connected to a power unit mounted on the mounting bracket.

[0010] Furthermore, the blades of the wind turbine have serrations on their trailing edges.

[0011] Furthermore, the tooth width of the serration gradually increases from the leaf root to the leaf tip.

[0012] Furthermore, the tooth height of the serrations gradually increases from the leaf root to the leaf tip.

[0013] Furthermore, the inner diameter of the air inlet port of the centrifugal ring is smaller than the inner diameter of the air outlet port of the centrifugal ring.

[0014] Furthermore, multiple connecting studs are evenly arranged on the first connecting portion along the circumference of the collector.

[0015] Furthermore, the fitting depth between the collector and the wind turbine blade is set to h, and h satisfies the relationship: 4mm≤h≤20mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] In use, the axial flow fan of this invention can be adjusted by using a telescopic adjustment mechanism to move the collector relative to the impeller along the axial direction of the impeller, thereby adjusting the engagement depth between the collector and the impeller. This allows the axial flow fan to be applied to different working conditions. Because the engagement depth between the collector and the impeller varies under different working conditions, the collector can be adjusted along the axial direction of the impeller relative to the impeller during use to achieve a suitable engagement depth. This ensures that the airflow enters the impeller smoothly and evenly, reducing the formation of eddies and turbulence, improving the aerodynamic efficiency of the fan, and reducing the noise of the axial flow fan. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural schematic diagram of the axial flow fan of this utility model;

[0019] Figure 2 This is a schematic diagram of the wind turbine structure according to an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the current collector according to an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the air guide ring involved in an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the mounting bracket involved in an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the structure of an external rotor motor according to an embodiment of the present utility model;

[0024] Figure 7 This is a cross-sectional view of the current collector according to an embodiment of the present utility model;

[0025] Figure 8 This is a cross-sectional view of the air guide ring involved in an embodiment of this utility model.

[0026] Numbering in each attached figure:

[0027] 1. Collector; 2. First locking nut; 3. Second locking nut; 4. Connecting stud; 5. Air guide ring; 6. Fan wheel; 7. Mounting bracket; 8. Drive motor; 9. Through hole; 10. Centrifugal ring; 11. Serrated edge; 12. Fixing part; 13. First connecting part; 14. Second connecting part; 15. Blade; 16. Hub; 17. Connecting pad; 18. Connecting frame; 19. Annular pad. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] In the description of this utility model, it should be understood that the terms "width", "upper", "lower", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Please refer to Figure 1 - Figure 8 This utility model provides an axial flow fan, including a mounting bracket 7, a collector 1, an air guide ring 5, and a fan wheel 6. The fan wheel 6 is rotatably mounted on the mounting bracket 7; as shown... Figure 5As shown, the mounting bracket 7 includes a connecting pad 17, a connecting frame 18, and an annular pad 19. The annular pad 19 and the connecting frame 18 are provided in multiple ways. The first end of the multiple connecting frames 18 is connected and fixed to the outer ring of the annular pad 19. The multiple connecting frames 18 are evenly arranged along the circumference of the annular pad 19. The second end of each connecting frame 18 is fixedly connected to a connecting pad 17.

[0033] Reference Figure 1 and Figure 4 The first end of the air guide ring 5 is connected and fixed to the mounting bracket 7. A fixing part 12 is integrally connected to the outer edge of the port of the first end of the air guide ring 5. The fixing part 12 is a ring structure. The fixing part 12 of the air guide ring 5 is fixed to the connecting pad 17 of the mounting bracket 7 by bolts or screws. A second connecting part 14 is provided on the outer edge of the port of the second end of the air guide ring 5. The second connecting part 14 is arranged along the circumference of the air guide ring 5 and is integrally connected to the outer edge of the port of the air guide ring 5. The second connecting part 14 is arranged along the circumference of the air guide ring 5. The air guide ring 5 and the annular pad 19 are coaxially arranged.

[0034] Reference Figure 1 and Figure 2 The wind turbine 6 is located within the wind guide ring 5 and the two are coaxially arranged. The wind turbine 6 includes a hub 16, a centrifugal ring 10, and multiple blades 15. The roots of the multiple blades 15 are connected and fixed to the outer wall of the hub 16. The multiple blades 15 are evenly arranged along the circumference of the hub 16, and the tips of the multiple blades 15 are all connected and fixed to the inner wall of the centrifugal ring 10. The centrifugal ring 10 and the blades 15 are integrally formed, which can effectively improve the structural strength and rigidity of the wind turbine and reduce the deformation of the blade tips of the blades 15.

[0035] Of course, the centrifugal ring 10 is located around the periphery of multiple blades 15. There is a gap between the outer wall of the centrifugal ring 10 and the inner wall of the air guide ring 5. The air outlet of the collector 1 is inserted into the centrifugal ring 10. The collector 1 and the centrifugal ring 10 are coaxially arranged. The hub 16 is driven by the power unit set on the mounting bracket 7. The power unit includes a drive motor 8, which is fixed on the annular pad 19 of the mounting bracket 7. The drive motor 8 is an external rotor motor (e.g., Figure 6 (as shown), refer to Figure 1 The rotor of the drive motor 8 is connected to the hub 16, so that when the drive motor 8 is started, the wind turbine 6 can be rotated.

[0036] Reference Figure 1 and Figure 3The through hole 9 on the collector 1 is the installation and fixing position of the entire axial flow fan. The air outlet port of the collector 1 is inserted into the impeller, and the collector 1 and the centrifugal ring 10 of the impeller 6 are coaxial. Specifically, the air outlet port of the collector 1 is inserted into the centrifugal ring 10 of the impeller; a first connecting part 13 is provided on the outer edge of the air inlet port of the collector 1, and the first connecting part 13 is arranged along the circumference of the collector 1; a plurality of telescopic adjustment mechanisms are provided between the first connecting part 13 and the second connecting part 14, and the plurality of telescopic adjustment mechanisms are arranged along the circumference of the air guide ring 5. The telescopic adjustment mechanisms are arranged on the second connecting part 14 along the axial direction of the air guide ring 5, and the telescopic ends of the telescopic adjustment mechanisms are connected to the first connecting part 13.

[0037] In summary, when using the axial flow fan of this invention, the first connecting part 13 can be adjusted via the telescopic adjustment mechanism to move the collector 1 relative to the impeller along the axial direction of the impeller, thereby adjusting the engagement depth between the collector 1 and the centrifugal ring 10 of the impeller. This allows the axial flow fan of this invention to be applied to different working conditions. Because the engagement depth between the collector 1 and the centrifugal ring 10 of the impeller varies under different working conditions, the collector 1 can be adjusted relative to the impeller along the axial direction of the impeller during use to achieve a suitable engagement depth. This ensures that the airflow enters the impeller smoothly and evenly, reduces the formation of eddies and turbulence, improves the aerodynamic efficiency of the fan, and reduces the noise of the axial flow fan.

[0038] It should be noted that the fitting depth between the collector 1 and the impeller 6 also affects the energy loss inside the fan. A reasonable fitting depth can reduce the friction and collision of airflow between the collector 1 and the impeller, thereby reducing energy loss and improving the overall efficiency of the fan. An inappropriate fitting depth may increase energy loss, leading to a decrease in fan efficiency. In addition, changes in the fitting depth between the collector 1 and the impeller will also change the flow field distribution inside the fan. A suitable fitting depth can optimize the flow field structure, making the airflow evenly distributed on the impeller blades 15, improving the uniformity of stress on the blades 15 and the aerodynamic performance. If the fitting depth is inappropriate, it may lead to uneven flow field distribution and uneven stress on the blades 15, thus affecting the stability and lifespan of the fan.

[0039] In one embodiment, reference is made to Figure 1The telescopic adjustment mechanism includes a connecting stud 4, a first locking nut 2, and a second locking nut 3. The connecting stud 4 is welded to the first connecting part 13, and the connecting stud 4 is threaded through the second connecting part 14. The first locking nut 2 and the second locking nut 3 are both threadedly connected to the connecting stud 4. The first locking nut 2 is located between the second connecting part 14 and the first connecting part 13, and the second locking nut 3 is located on the side of the second connecting part 14 facing away from the first connecting part 13. The connecting stud 4 passes through the mounting hole on the second connecting part 14 and is locked by the first locking nut 2 and the second locking nut 3. Through the cooperation of the connecting stud 4 with the first locking nut 2 and the second locking nut 3, the fitting depth between the collector 1 and the impeller can be easily adjusted.

[0040] Of course, in other embodiments, the telescopic adjustment mechanism may also be a lifting mechanism, such as a screw lifting mechanism or an electric push rod, etc., which is not limited here. For those skilled in the art, by reasonably changing the structure of the telescopic adjustment mechanism, it should also fall within the protection scope of this utility model.

[0041] Multiple connecting studs 4 are evenly arranged on the first connecting part 13 along the circumference of the collector 1, which can effectively improve the connection performance between the collector 1 and the air guide ring 5. For example, the number of connecting studs 4 is greater than or equal to 3. Of course, the number of connecting studs 4 can also be set to 4, which is not limited here.

[0042] In one embodiment, reference is made to Figure 1 The insertion depth between the collector 1 and the impeller blades is set to h, where h satisfies the relationship: 4mm ≤ h ≤ 20mm. For example, under one operating condition, h can be 4mm; under another, h can be 20mm, 5mm, 10mm, or 8mm. Specifically, the depth to which the outlet port of the collector 1 is inserted into the centrifugal ring 10 is h, and the range of h is set to 4mm ≤ h ≤ 20mm to avoid affecting the overall aerodynamic characteristics of the fan due to the outlet port of the collector 1 being inserted too deeply or too far into the centrifugal ring 10.

[0043] In one embodiment, reference is made to Figure 1 and Figure 4 The inner diameter of the air inlet of the air guide ring 5 is smaller than the inner diameter of the air outlet. This allows the air guide ring 5 to act as a diffuser, achieving a noise reduction effect. Specifically, when the inner diameter of the air inlet of the air guide ring 5 is small, and the inner diameter of the air outlet is large, the fluid flows out over a larger area at the air outlet, slowing down the flow velocity and converting kinetic energy into static pressure energy. This increases the static pressure at the air outlet of the air guide ring 5, thus achieving a noise reduction effect.

[0044] Similarly, refer to Figure 1 and Figure 2 The inner diameter of the air inlet port of the centrifugal ring 10 is smaller than the inner diameter of the air outlet port of the centrifugal ring 10. Specifically, when the inner diameter of the air inlet port of the centrifugal ring 10 is small and the inner diameter of the air outlet port of the centrifugal ring 10 is large, the fluid flows out over a larger area at the air outlet port of the centrifugal ring 10, the flow velocity will slow down, and the kinetic energy will be converted into static pressure energy, thereby increasing the static pressure at the air outlet of the centrifugal ring 10, thus achieving the effect of noise reduction.

[0045] In summary, the axial flow fan of this invention achieves first diffusion through the centrifugal ring 10 at the tip of the impeller blades and second diffusion through the air guide ring 5. The two diffusions can significantly increase the working pressure, which is beneficial to improving the efficiency and reducing the noise of the fan.

[0046] It needs to be explained that the leading edge of blade 15 refers to the very front part of blade 15, and the trailing edge refers to the very end part of blade 15, and the trailing edge refers to the very end part of blade 15. The leading edge, as the front end of blade 15, mainly guides the airflow; the trailing edge, as the end of blade 15, mainly stabilizes the airflow. In other words, it can be understood that after the airflow enters the collector 1, it enters from the leading edge of blade 15 of the wind turbine and then enters from the trailing edge of blade 15, and finally exits from the guide ring 5.

[0047] In one embodiment, reference is made to Figure 1 and Figure 2 The blades 15 of the wind turbine have serrations 11 on their trailing edges. These serrations 11 alter the shape of the trailing edge, enabling the turbine to utilize wind energy more efficiently during operation. This is primarily because the serration structure changes the airflow pattern at the trailing edge, optimizing aerodynamic performance. Furthermore, the serrations 11 disperse pressure on the blade surface, resulting in more uniform wear and fatigue, extending the blade's lifespan, and reducing turbine maintenance costs.

[0048] In one embodiment, reference is made to Figure 1 and Figure 2 The tooth width of the serration 11 gradually increases from the root to the tip of the blade 15, which can more effectively guide the airflow and reduce airflow separation and vortexing at the trailing edge of the blade 15, thereby reducing energy loss. Similarly, the tooth height of the serration 11 gradually increases from the root to the tip of the blade 15, which can better capture and convert wind energy. This is because the gradually increasing height of the serration 11 structure can better guide the airflow and reduce airflow separation and vortexing at the trailing edge of the blade 15, thereby reducing energy loss.

[0049] Additionally, it should be noted that the fan's dimensions (length × width × height) are 750mm × 750mm × 248mm; the impeller has 7 blades, made of ABS; the impeller hub height is 120mm, and the maximum outer diameter is 196mm; the impeller blade tip centrifugal ring height is 86mm, the wall thickness is 3mm, the inlet inner diameter is 511mm, and the outlet inner diameter is 549mm; the collector is made of Q235 stainless steel, with dimensions (length × width × height) of 750mm × 750mm × 49mm, a wall thickness of 2mm, an inlet inner diameter of 576mm, and an outlet inner diameter of 498mm; the collector is housed within the centrifugal ring at the impeller blade tip. The connection depth is 6mm, and the minimum radial clearance between the collector and the centrifugal ring of the impeller is 3.994mm; four M10×80mm studs are welded to the collector; the material of the guide ring is Q235, the height of the guide ring is 105mm, the wall thickness is 1.5mm, and the radial clearance between the guide ring and the centrifugal ring of the impeller is 5mm; the minimum height of the serrations on the blade trailing edge is 4.6mm, the maximum height is 10.4mm, the minimum width between the serrations is 12.7mm, the maximum width is 16.1mm, the serrations start from 52mm from the blade root and end at 33.2mm from the blade tip, and the serrations are distributed from small to large.

[0050] When the optimal aerodynamic performance is proposed, such as Figure 7 As shown, the functional relationship between the height variable H1 and the radius variable R1 of the inner wall curve segment of the collector is: H1 = -0.043 * R1^2 + 24.065 * R1 - 3324.6;

[0051] like Figure 8 As shown, the functional relationship between the height H2 of the inner wall curve of the air guide ring and the radius R2 is: H2 = 0.1045 * R2^2 - 60.717 * R2 + 8815.5.

[0052] 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. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. An axial flow fan, comprising a mounting bracket, a collector, a guide ring, and a fan wheel, wherein the fan wheel is rotatably mounted on the mounting bracket; a first end of the guide ring is fixedly connected to the mounting bracket, the fan wheel is located within the guide ring, and the two are coaxially arranged; the outlet port of the collector is inserted into the fan wheel, characterized in that, The outer edge of the air inlet port of the collector is provided with a first connecting part, which is arranged along the circumference of the collector; the outer edge of the second end of the air guide ring is provided with a second connecting part, which is arranged along the circumference of the air guide ring; a plurality of telescopic adjustment mechanisms are provided between the first connecting part and the second connecting part, which are arranged along the circumference of the air guide ring, and are arranged on the second connecting part along the axial direction of the air guide ring, with the telescopic end of the telescopic adjustment mechanism connected to the first connecting part.

2. The axial flow fan according to claim 1, characterized in that, The telescopic adjustment mechanism includes a connecting stud, a first locking nut, and a second locking nut. The connecting stud is connected to a first connecting part, and the connecting stud is threaded through the second connecting part. Both the first locking nut and the second locking nut are threadedly connected to the connecting stud. The first locking nut is located between the second connecting part and the first connecting part, and the second locking nut is located on the side of the second connecting part facing away from the first connecting part.

3. The axial flow fan according to claim 1, characterized in that, The inner diameter of the air inlet port of the air guide ring is smaller than the inner diameter of the air outlet port of the air guide ring.

4. The axial flow fan according to claim 1, characterized in that, The wind turbine includes a hub, a centrifugal ring, and multiple blades. The blade roots of the multiple blades are connected and fixed to the outer wall of the hub. The multiple blades are evenly arranged along the circumference of the hub. The blade tips of the multiple blades are all connected and fixed to the inner wall of the centrifugal ring. The centrifugal ring is located around the multiple blades. The air outlet of the collector is inserted into the centrifugal ring. The hub is driven and connected to a power unit mounted on the mounting bracket.

5. The axial flow fan according to claim 4, characterized in that, The blades of the wind turbine have serrations on their trailing edges.

6. The axial flow fan according to claim 5, characterized in that, The width of the serrations gradually increases from the leaf root to the leaf tip.

7. The axial flow fan according to claim 5, characterized in that, The tooth height of the serrations gradually increases from the leaf root to the leaf tip.

8. The axial flow fan according to claim 4, characterized in that, The inner diameter of the air inlet port of the centrifugal ring is smaller than the inner diameter of the air outlet port of the centrifugal ring.

9. The axial flow fan according to claim 2, characterized in that, Multiple connecting studs are evenly arranged on the first connecting portion along the circumference of the collector.

10. The axial flow fan according to claim 1, characterized in that, The fitting depth between the collector and the wind turbine blade is set as h, and h satisfies the relationship: 4mm≤h≤20mm.

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