Axial flow fan capable of reducing noise

Abstract

The utility model relates to the field of fluid power devices, in particular to a noise-reducing axial flow fan which comprises a hub, a plurality of axial flow blades evenly distributed in the circumferential direction of the hub and a shaft sleeve arranged in the center of the hub, and the shaft sleeve is used for being connected with a motor shaft. The shaft sleeve is connected with the peripheral side wall of the hub through a plurality of reinforcing ribs which extend in the radial direction and are distributed in the circumferential direction. The end of the leeward side of the hub is constructed to be a dome-shaped protrusion, and the outer wall face of the dome-shaped protrusion is a catenary curved face capable of guiding the direction of airflow. According to the catenary curved surface, airflow energy loss is reduced through the design that the air molecule rate distribution is not uniform, so that wind resistance is reduced, the air volume is increased, and operation noise is reduced. The scheme has the advantages of reducing airflow energy loss, reducing wind resistance, increasing air volume and reducing operation noise.

Description

Technical Field

[0001] This utility model relates to the field of fluid power devices, and in particular to an axial flow fan that reduces noise. Background Technology

[0002] Axial fans, as a common fluid power device, are widely used in electronic equipment, dry-type transformers, computer cooling systems, vehicle ventilation, and heating and cooling systems. Their core function is to achieve heat dissipation or ventilation through forced airflow. Traditional axial fans typically employ a flat blade design on the leeward side of the hub. This structure has significant drawbacks during operation: air molecules leave the flat blades at a uniform rate, causing turbulence when the airflow separates from the blade surface, leading to increased wind resistance, energy loss, and increased operating noise. Furthermore, the sharp edges and rigid transition structure of the flat blades easily exacerbate airflow turbulence, further amplifying noise problems, especially under high-speed operation or long-term use, resulting in significant performance degradation.

[0003] Therefore, a comprehensive structural innovation solution is urgently needed to systematically reduce airflow energy loss and noise while improving airflow efficiency and product reliability by optimizing hub shape, blade surface design, and manufacturing process. Existing technologies urgently need improvement to address these issues. Summary of the Invention

[0004] In order to solve the above problems, the purpose of this utility model is to provide an axial flow fan with reduced noise, which has the advantages of reducing airflow energy loss, reducing wind resistance, increasing air volume and reducing operating noise.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This application provides an axial fan with reduced noise, the technical solution of which is as follows:

[0007] The device includes a hub, multiple axial flow blades evenly distributed along the circumference of the hub, and a bushing located at the center of the hub, the bushing being used to connect the motor shaft; the bushing is connected to the outer sidewall of the hub by multiple radially extending and circumferentially distributed reinforcing ribs; the leeward end of the hub is constructed as a dome-shaped protrusion, the outer wall surface of which is a catenary surface that can guide the airflow direction; the catenary surface, through the design of uneven air molecule velocity distribution, reduces airflow energy loss, thereby reducing wind resistance, increasing airflow, and reducing operating noise.

[0008] Furthermore, this application also proposes that the bottom edge of the dome-shaped protrusion of the catenary surface coincides and connects with the end of the outer wall surface of the hub.

[0009] Furthermore, this application also proposes that the dome-shaped protrusion forms a round-bottomed hub groove at the bottom of the air intake side of the hub, and multiple reinforcing ribs are regularly distributed circumferentially within the round-bottomed hub groove, and the bottom of the reinforcing ribs and the bottom surface of the round-bottomed hub groove are integrally formed arc-shaped structures.

[0010] Furthermore, this application also proposes that a reinforcing cylinder be provided at the outer end of the reinforcing rib, the diameter of the reinforcing cylinder being larger than the thickness of the reinforcing rib, for use as a support for the ejector pin during injection molding to prevent deformation during ejection.

[0011] Furthermore, this application also proposes that the axial length of the hub is D, the height of the catenary surface is H, and the ratio of H / D is in the range of 15% to 50%.

[0012] Furthermore, this application also proposes that multiple blade ribs are provided on the back pressure surface of the axial flow blade, the blade ribs are distributed radially along the axial flow blade, and the length of the blade ribs gradually increases from the inside to the outside in the radial direction; the curvature of the blade ribs is adapted to the curvature of the outer edge of the blade to form a continuous arc structure, which is used to enhance the blade stiffness and optimize the airflow guidance.

[0013] Furthermore, this application also proposes that the inner edge of the axial flow blade is connected to the circumferential outer wall of the hub, and the front end and rear end of the inner edge of the blade extend to the two axial edges of the circumferential outer wall, respectively.

[0014] Furthermore, this application also proposes that the hub and axial flow blades are integrally injection molded from plastic material, and the catenary surface is directly formed through a mold structure.

[0015] As can be seen from the above, the axial flow fan with noise reduction provided in this application systematically reduces airflow energy loss and noise by optimizing the hub shape, blade surface design and manufacturing process, while improving airflow efficiency and product reliability. It has the advantages of reducing airflow energy loss, reducing wind resistance, increasing airflow and reducing operating noise. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the exhaust side of an axial fan.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the air inlet side of an axial flow fan.

[0018] Figure 3 This is a side view of an axial fan. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", 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.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0022] In this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" are used interchangeably.

[0023] The terms "connection" and "internal connection" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection 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.

[0024] 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.

[0025] like Figure 1-3 As shown, this embodiment relates to a noise-reducing axial flow fan, including a hub 1, multiple axial flow blades 2 evenly distributed circumferentially along the hub 1, and a bushing 3 located at the center of the hub 1, which is used to connect the motor shaft. The bushing 3 is connected to the outer sidewall of the hub 1 by multiple radially extending and circumferentially distributed reinforcing ribs 4. The leeward end of the hub 1 is constructed as a dome-shaped protrusion 5, and the outer wall surface of the dome-shaped protrusion 5 is a catenary surface 6 that can guide the airflow direction. The catenary surface 6 reduces airflow energy loss through the design of uneven distribution of air molecule speed, thereby reducing wind resistance, increasing airflow, and reducing operating noise. The technical solution of this application systematically reduces airflow energy loss and noise by optimizing the shape of the hub 1 and the airflow guidance, while improving airflow efficiency and product reliability. Compared with the prior art, the axial flow fan of this application, through the design of the dome-shaped protrusion 5 and the catenary surface 6, effectively reduces the turbulence generated when the airflow separates from the blade surface, reduces wind resistance and energy loss, and thus significantly reduces operating noise. In addition, the integrated design of the reinforcing rib 4 and the round-bottomed hub groove 7 enhances the overall strength and stability of the structure, improving the reliability and service life of the product.

[0026] Furthermore, the bottom edge of the catenary surface 6 of the dome-shaped protrusion 5 coincides with the end of the outer wall of the hub 1. Specifically, the coincidence of the bottom edge of the catenary surface 6 with the end of the outer wall of the hub 1 can be achieved in various ways. For example, the bottom edge of the catenary surface 6 and the end of the outer wall of the hub 1 can be connected by a smooth curved transition, ensuring a perfect geometric match between the two. In addition, the connection between the bottom edge of the catenary surface 6 and the end of the outer wall of the hub 1 can be achieved by an integral molding process, ensuring structural strength and integrity. As a preferred embodiment, the connection between the bottom edge of the catenary surface 6 and the end of the outer wall of the hub 1 can be designed as an arc transition, further reducing turbulence and separation of airflow in the transition area. Thus, this application achieves a smooth transition between the catenary surface 6 and the outer wall of the hub 1 by coinciding with the bottom edge of the catenary surface 6 of the dome-shaped protrusion 5 with the end of the outer wall of the hub 1. This design effectively avoids turbulence or separation of airflow in the transition area, thereby reducing airflow energy loss and lowering wind resistance and operating noise. This structural design allows for smoother airflow guidance in the axial fan, improving overall performance. Compared to existing technologies, the solution presented in this application offers significant advantages in reducing noise and minimizing airflow energy loss, making it particularly suitable for high-speed operation or...

[0027] Scenarios requiring prolonged use.

[0028] Furthermore, the dome-shaped protrusion 5 forms a round-bottomed hub groove 7 at the bottom of the air intake side of the hub 1. Multiple reinforcing ribs 4 are regularly distributed circumferentially within the round-bottomed hub groove 7, and the bottom of the reinforcing ribs 4 and the bottom surface of the round-bottomed hub groove 7 are integrally formed arc-shaped structures. The design of the round-bottomed hub groove 7 allows the reinforcing ribs 4 to be evenly distributed, and the integrally formed arc-shaped structure with the bottom surface of the groove enhances overall stability. The arc-shaped structure of the round-bottomed hub groove 7 can be achieved through mold design. Specifically, the bottom of the mold can be designed as an arc matching the bottom surface of the hub groove, thus forming an integrally formed arc-shaped structure during injection molding. Therefore, this technical solution, through the design of the round-bottomed hub groove 7 and the reinforcing cylinder 8, effectively solves the problem of easy deformation of the reinforcing ribs 4 during injection molding, ensuring structural stability. Compared with existing technologies, this solution not only improves the precision of injection molding but also enhances the overall strength and durability of the hub 1, thereby improving the performance and reliability of the axial flow fan.

[0029] Furthermore, this application proposes that a reinforcing cylinder 8 be provided at the outer end of the reinforcing rib 4. The diameter of the reinforcing cylinder 8 is larger than the thickness of the reinforcing rib 4, which is used to provide support for the ejector pin during injection molding and prevent deformation during ejection. The diameter of the reinforcing cylinder 8 can be adjusted according to specific application scenarios to ensure sufficient support area. As a preferred embodiment, the diameter of the reinforcing cylinder 8 can be designed to be 1.5 to 2 times the thickness of the reinforcing rib 4 to ensure structural strength while avoiding material waste. In addition, the height of the reinforcing cylinder 8 can also be optimized according to actual needs, usually maintaining the same height as the reinforcing rib 4, to ensure that the ejector pin can apply pressure evenly during support. Specifically, the reinforcement cylinder 8 provides a larger support area by increasing its diameter, enabling the ejector pin to apply pressure evenly during injection molding and reducing local stress concentration, thereby effectively preventing deformation of the outer end of the reinforcing rib 4 during demolding. This design improves the stability of injection molding and product quality through structural optimization. Compared with existing technologies, this technical solution not only solves the problem of easy ejection deformation at the outer end of the reinforcing rib 4, but also improves the overall performance of the product through structural optimization, demonstrating significant practicality and innovation.

[0030] like Figure 3As shown, the axial length of the hub 1 is D, and the height of the catenary surface 6 is H, with the H / D ratio ranging from 15% to 50%. Specifically, the axial length D of the hub 1 refers to the length of the hub 1 along its central axis, while the height H of the catenary surface 6 refers to the maximum height of the catenary surface 6 perpendicular to the axial direction. By controlling the H / D ratio between 15% and 50%, the flow characteristics of airflow passing through the hub 1 can be effectively optimized, reducing turbulence generated when the airflow separates from the surface of the hub 1, thereby reducing wind resistance and noise. For example, as a preferred embodiment, the H / D ratio can be set to 30% to achieve the best balance between reducing noise and reducing energy loss. Therefore, the design of the ratio of the axial length D of the hub 1 to the height H of the catenary surface 6, by precisely controlling this ratio, can significantly improve the aerodynamic performance of the fan, enhance airflow efficiency, and simultaneously reduce energy loss and noise during operation. Compared with existing technologies, this technical solution, by optimizing the shape of the hub 1, reduces the separation of airflow from the surface of the hub 1, thereby reducing turbulence generation and further reducing wind resistance and noise. Therefore, this technical solution not only improves fan performance but also solves the problems of airflow energy loss and noise during the operation of traditional axial fans.

[0031] Furthermore, multiple blade ribs 9 are provided on the back pressure surface of the axial flow blade 2. These blade ribs 9 are distributed radially along the axial flow blade 2, and their length gradually increases from the inside to the outside in the radial direction. The curvature of the blade ribs 9 matches the curvature of the outer edge of the blade, forming a continuous arc-shaped structure to enhance blade stiffness and optimize airflow guidance. Specifically, the blade ribs 9 can be set in various ways. For example, the blade ribs 9 can be integrally formed from the same material as the blade, or fixed to the blade by welding, bonding, or other methods. The cross-sectional shape of the blade ribs 9 can be rectangular, trapezoidal, or other suitable shapes to provide sufficient stiffness and strength. In addition, the distribution density and number of blade ribs 9 can be adjusted according to the blade size and operating conditions to achieve optimal stiffness and airflow guidance. As a preferred embodiment, the gradual increase in the length of the blade ribs 9 from the inside to the outside can better adapt to the stress conditions of the blade at different radial positions, thereby effectively reducing the vibration and deformation of the blade during high-speed operation. The continuous arc-shaped structure of the blade ribs 9 perfectly matches the curvature of the blade's outer edge, allowing for smoother airflow as it passes through the blade, reducing airflow separation and turbulence, and lowering wind resistance and noise. This technical solution addresses the technical problems of insufficient stiffness and suboptimal airflow guidance in axial blades 2 during operation by enhancing blade rigidity and optimizing airflow direction. Compared to existing technologies, this solution not only improves blade stability and lifespan but also significantly reduces wind resistance and noise, enhancing the overall performance of the fan.

[0032] Furthermore, this application proposes that the inner edge of the axial flow blade 2 is connected to the circumferential outer wall of the hub 1, and the front and rear ends of the inner edge of the blade extend to the two axial edges of the circumferential outer wall, respectively. This design enhances the structural stability between the blade and the hub 1 by tightly connecting the inner edge of the blade to the circumferential outer wall of the hub 1 and extending it axially to the two edges of the hub 1. Specifically, the front and rear ends of the inner edge of the blade extend to the two axial edges of the hub 1, so that the blade essentially covers the entire sidewall of the hub 1 axially, thereby optimizing the airflow guidance and reducing turbulence generation. As a preferred embodiment, the extended portion of the inner edge of the blade can be fixed to the outer wall of the hub 1 by welding, riveting, or integral molding to ensure the strength and airtightness of the connection. The working principle of this technical solution is that by extending the inner edge of the blade to the two axial edges of the hub 1, the connection between the blade and the hub 1 is more stable, reducing airflow separation at the connection point and thus reducing noise. Specifically, the extended inner edge design of the blades optimizes the airflow path, reduces turbulence and energy loss at the connection point, and thus improves the fan's operating efficiency. Compared with existing technologies, this solution effectively solves the problems of airflow separation and increased noise in traditional designs by enhancing the connection structure between the blades and hub 1, thereby improving the overall performance of the fan.

[0033] Furthermore, this application proposes that the hub 1 and axial flow blades 2 are integrally injection molded from plastic material, and the catenary surface 6 is directly formed through a mold structure. Specifically, the integral injection molding technology of plastic material avoids the errors and stress concentration problems caused by the assembly of multiple parts in traditional manufacturing methods by injection molding the hub 1 and axial flow blades 2 as a whole. The formation of the catenary surface 6 is directly achieved through the mold structure, ensuring the accuracy and consistency of the surface. As a preferred embodiment, the plastic material can be selected from engineering plastics with high strength and heat resistance, such as polycarbonate or nylon, to enhance the durability and stability of the product. In addition, the design of the mold structure can be further optimized, for example, by adopting high-precision CNC machining technology to ensure the smoothness and geometric accuracy of the catenary surface 6. Thus, this technical solution significantly improves the structural integrity and consistency of the axial flow fan by integral injection molding and direct formation of the catenary surface 6 through a mold, reduces assembly errors and material stress concentration during the manufacturing process, thereby improving the performance and reliability of the product. Compared with existing technologies, this solution not only simplifies the production process but also enhances the structural strength and service life of the product, effectively solving the performance and reliability problems existing in traditional manufacturing methods.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A reduced noise axial flow fan characterized by, The application relates to a hub (1), a plurality of axial flow blades (2) uniformly distributed along the circumference of the hub (1), and a shaft sleeve (3) arranged at the center of the hub (1), wherein the shaft sleeve (3) is used for connecting a motor shaft. The shaft sleeve (3) is connected with the peripheral side wall of the hub (1) through a plurality of reinforcing ribs (4) extending in the radial direction and distributed in the circumferential direction. The leeward end of the hub (1) is constructed as a dome-shaped protrusion (5), and the outer wall surface of the dome-shaped protrusion (5) is a catenary surface (6) capable of guiding the flow direction of air. The catenary surface (6) is designed to be uneven in air molecule velocity distribution, thereby reducing air flow energy loss, lowering wind resistance, increasing air volume and reducing operation noise. The bottom edge of the catenary surface (6) of the dome-shaped protrusion (5) coincides with the end of the outer side wall of the hub (1).

2. The axial fan according to claim 1, characterized in that The dome-shaped protrusion (5) forms a circular-bottomed hub groove (7) at the bottom of the air inlet side of the hub (1), a plurality of reinforcing ribs (4) are regularly distributed in the circumferential direction in the circular-bottomed hub groove (7), and the bottom of the reinforcing rib (4) and the bottom surface of the circular-bottomed hub groove (7) are integrally formed in an arc structure.

3. The axial fan according to claim 1, characterized in that A reinforcing cylinder (8) is arranged on the outer end of the reinforcing rib (4), the diameter of the reinforcing cylinder (8) is larger than the thickness of the reinforcing rib (4), the reinforcing cylinder (8) is used for supporting a ejector rod when the mold is ejected, and ejection deformation is avoided.

4. The axial fan according to claim 3, characterized in that The axial length of the hub (1) is D, the height of the catenary surface (6) is H, and the range of H / D is 15%-50%.

5. The axial fan according to claim 1, wherein A plurality of blade ribs (9) are arranged on the back pressure surface of the axial flow blade (2), the blade ribs (9) are distributed in the radial direction of the axial flow blade (2), and the length of the blade ribs (9) gradually increases from the inside to the outside in the radial direction; the curvature of the blade ribs (9) is matched with the curvature of the blade outer edge to form a continuous circular arc structure, so that the blade rigidity is enhanced and the air flow direction is optimized.

6. The axial fan according to claim 1, wherein The inner edge of the axial flow blade (2) is connected to the circumferential outer wall of the hub (1), and the front end and the rear end of the inner edge extend to the axial edges of the circumferential outer wall.

7. The axial fan according to claim 1, wherein The hub (1) and the axial flow blade (2) are integrally injection molded by a plastic material, and the catenary surface (6) is directly formed through a mold structure.

8. The axial fan according to any one of claims 1 to 7, characterized in that ​

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