High-strength integrally-formed fan blade

Abstract

The utility model relates to the technical field of fan blades, and particularly discloses a high-strength integrally-formed fan blade. Comprising a hub and a plurality of blades, the blades are integrally connected to the periphery of the hub in an injection molding mode, a transition part is arranged between the blades and the hub, the thickness of the section of the transition part is gradually increased from the blades to the axis direction of the hub, and a plurality of shrinkage compensation grooves are formed in the leeside of the transition part. According to the utility model, the integral injection molding is designed to be matched with the gradient thickness transition part, so that the weight of the fan blade is reduced, the strength of the fan blade is obviously enhanced, the high-rotating-speed working condition requirement is met, the static balance and dynamic balance of the fan blade are greatly reduced, the operation is more stable, and the noise is obviously reduced; and meanwhile, by designing the shrinkage compensation groove, the injection molding hollow phenomenon possibly caused by thickness increase is effectively avoided, the product quality is improved, and the operation performance and safety are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine blades, and specifically discloses a high-strength one-piece molded wind turbine blade. Background Technology

[0002] Axial fan blades are the core component of ventilation equipment, widely used in evaporative air coolers, industrial ventilation systems, and other fields to achieve forced air convection and efficient heat dissipation. As ventilation equipment develops towards larger air volumes and higher efficiency, higher requirements are placed on the size, strength, and performance of axial fan blades.

[0003] However, in existing technologies, most fan blades with a diameter greater than 620mm adopt a design where the blades and metal hub are separate and connected by screws or rivets. This traditional structure has many drawbacks: the metal hub and shaft are expensive and the manufacturing process is complex; the connection strength is low, and the blades are prone to breakage at high speeds, posing a safety hazard; the fan blades are heavy, requiring more power to drive them, increasing energy consumption; the static and dynamic balance requirements are high, resulting in unstable operation, high noise, and affecting the service life of the equipment and the comfort of the working environment. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-strength one-piece molded fan blade.

[0005] This utility model discloses a high-strength one-piece molded fan blade, which adopts the following technical solution:

[0006] A high-strength, one-piece molded wind turbine blade is integrally injection molded and connected to the outer periphery of the hub. A transition section is provided between the blade and the hub. The cross-sectional thickness of the transition section gradually increases from the blade to the hub axis. Several shrinkage compensation grooves are provided on the leeward side of the transition section.

[0007] Preferably, the leeward side of the wheel hub is also provided with several shrinkage compensation grooves.

[0008] Preferably, the cross-sectional thickness of the transition portion gradually increases from 6 mm to 25 mm.

[0009] Preferably, the depth of the shrinkage compensation groove is 40-70% of the thickness of the transition section.

[0010] Preferably, the leeward side of the transition section is integrally formed with a reinforcing rib extending to the axis.

[0011] Preferably, the height of the reinforcing rib is 2 to 10 mm.

[0012] Preferably, the diameter of the fan blade is 660mm to 720mm.

[0013] Preferably, the tip height of the blade is 150–220 mm.

[0014] Preferably, the shrinkage compensation groove is a circular groove or a long strip groove.

[0015] Preferably, the leeward side of the blade is integrally formed with a rectifier.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] This invention, through the design of an integrated injection molding process combined with a gradually thickening transition section, not only reduces the weight of the fan blades and significantly enhances their strength to meet the requirements of high-speed operation, but also greatly reduces the static and dynamic balance of the fan blades, resulting in smoother operation and significantly reduced noise. At the same time, by designing a shrinkage compensation groove, it effectively avoids the hollow injection molding phenomenon that may be caused by the increase in thickness, improves product quality, and significantly enhances operational performance and safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the high-strength, one-piece molded axial flow fan blade structure in this embodiment;

[0019] Figure 2 This is a top view of the high-strength, one-piece molded axial flow fan blade of this embodiment;

[0020] Figure 3 This is a partial cross-sectional view of the high-strength, one-piece molded axial flow fan blade of this embodiment.

[0021] Explanation of icon numbers:

[0022] 1. Hub; 11. Shaft; 2. Blade; 21. Rectifier; 3. Transition section; 31. Shrinkage compensation groove; 32. Reinforcing rib. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] This embodiment discloses a high-strength, one-piece molded axial flow fan blade, referring to... Figure 1-3The fan blades consist of a hub 1 and multiple blades 2. The blades 2 are integrally injection molded and connected to the outer periphery of the hub 1. A transition section 3 is provided between the blades 2 and the hub 1. The thickness of the transition section 3 gradually increases from the blades 2 towards the axis 11 of the hub 1, and a shrinkage compensation groove 31 is provided on the leeward side. This design utilizes an integral molding structure to reduce the weight of the fan blades and manufacturing costs. The increasing thickness of the transition section 3 improves the strength of the fan blades, meeting the requirements of high-speed operation. Simultaneously, by designing the shrinkage compensation groove 31 in the transition section 3, the amount of plastic material used is reduced, significantly reducing the overall weight of the fan blades and improving the energy efficiency of the equipment. Furthermore, the shrinkage compensation groove 31 effectively overcomes the hollow injection molding phenomenon that may occur due to increased thickness, improving the structural integrity and stability of the fan blades and ensuring their quality. This integrated molding axial flow fan blade design significantly reduces static and dynamic balance, resulting in smoother operation and significantly reduced noise.

[0025] As a preferred embodiment, the leeward side of the hub 1 is also provided with several shrinkage compensation grooves 31. This further optimizes the injection molding quality of the hub 1, prevents hollowness in this area, enhances the overall strength and stability of the hub 1, enables it to better withstand the stress generated when the wind turbine blades rotate, and extends the service life of the wind turbine blades.

[0026] As a preferred option, the cross-sectional thickness of the transition section 3 gradually increases from 6mm to 25mm, providing suitable strength support for the fan blades. This ensures that the connection between the blade 2 and the hub 1 can withstand centrifugal force during high-speed operation, preventing the blade 2 from breaking and ensuring the stable operation of the ventilation equipment. This gradual thickness design also optimizes the aerodynamic performance of the fan blades, reducing wind resistance and energy consumption.

[0027] As a preferred option, the depth of the shrinkage compensation groove 31 is 40-70% of the thickness of the transition section 3. This effectively compensates for material shrinkage during injection molding, avoiding hollow defects, without excessively weakening the structural strength of the fan blade. It balances process characteristics and product performance, improving the fan blade's pass rate and reliability. By designing an appropriate depth for the shrinkage compensation groove 31, it ensures that the fan blade maintains a uniform wall thickness after injection molding, enhancing the overall structural stability. The shrinkage compensation groove 31 can be a circular or elongated groove, flexibly selected according to the specific shape of the fan blade and the mold design. This helps to rationally guide material flow during injection molding, filling the mold cavity and ensuring uniform molding of all parts of the fan blade, improving the consistency and stability of the fan blade quality.

[0028] As a preferred embodiment, the leeward side of the transition section 3 is integrally formed with a reinforcing rib 32 extending to the shaft 11, further enhancing the mechanical strength of the wind turbine blade, resisting aerodynamic loads and centrifugal stress during operation, reducing the risk of blade deformation and fatigue damage, and extending the service life of the wind turbine blade. The design of the reinforcing rib 32 extending to the shaft 11 allows stress to be distributed more evenly in the wind turbine blade structure, avoiding stress concentration and improving the overall fatigue resistance of the wind turbine blade. The height of the reinforcing rib 32 is preferably 2-10mm, providing sufficient structural reinforcement for the wind turbine blade without significantly increasing its weight and cost, achieving an optimal match between strength and performance. The appropriate height of the reinforcing rib 32 meets the strength requirements while avoiding unnecessary material waste and weight increase.

[0029] As a preferred option, the diameter D of the fan blade can be 660mm to 720mm, suitable for equipment requiring large-diameter fan blades such as evaporative air coolers. Through integrated molding and structural optimization, weight is reduced while ensuring strength, thus lowering the equipment's operating power. The blade tip height H of blade 2 is preferably 150 to 220mm. Combined with the fan blade diameter range, this allows the fan blade to achieve efficient aerodynamic performance in specific ventilation equipment, ensuring sufficient airflow and ventilation effect, meeting the needs of industries such as evaporative air coolers for large air volume and high-efficiency ventilation. A reasonable design of the blade tip height helps optimize airflow organization, improve ventilation efficiency, and reduce energy consumption.

[0030] As a preferred embodiment, the leeward side of the blade 2 is integrally formed with a rectifier 21, which is arc-shaped. The rectifier 21 makes the originally turbulent airflow more orderly, which helps to optimize the airflow distribution and flow state, reduce airflow pulsation and vortex, and thus reduce air resistance and noise during blade operation.

[0031] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A high-strength integrally formed fan blade comprising a hub and a plurality of blades, characterized in that, The blade is integrally injection molded and connected to the outer periphery of the hub. There is a transition section between the blade and the hub. The cross-sectional thickness of the transition section gradually increases from the blade to the hub axis. The leeward side of the transition section is provided with several shrinkage compensation grooves.

2. The integrally formed high strength fan blade of claim 1, wherein, The leeward side of the wheel hub is also provided with several shrinkage compensation grooves.

3. The integrally formed high strength fan blade of claim 1, wherein, The cross-sectional thickness of the transition section gradually increases from 6 mm to 25 mm.

4. The integrally formed high strength fan blade of claim 1, wherein, The depth of the shrinkage compensation groove is 40-70% of the thickness of the transition section.

5. The integrally formed high strength fan blade of claim 1, wherein, The leeward side of the transition section is integrally formed and has reinforcing ribs extending to the axis.

6. The integrally formed high strength fan blade of claim 5, wherein, The height of the reinforcing rib is 2-10 mm.

7. The integrally formed high strength fan blade of claim 1, wherein, The diameter of the fan blade is 660mm to 720mm.

8. The integrally formed high strength fan blade of claim 1, wherein, The tip height of the blade is 150–220 mm.

9. The integrally formed high strength fan blade of claim 1, wherein, The shrinkage compensation groove is a circular groove or a long strip groove.

10. The integrally formed high strength fan blade of claim 1, wherein, The leeward side of the blade is integrally formed with a rectifier.

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