Streamline industrial fan blade

Abstract

The utility model relates to the technical field of industrial fan blades, and particularly discloses a streamline industrial fan blade which comprises a main shaft, the outer wall of the main shaft is fixedly connected with three connecting shafts distributed in a circumferential array mode, the other ends of the three connecting shafts are fixedly connected with mounting plates, and the other ends of the three mounting plates are fixedly connected with fan blade bodies. The fan blade body is of a three-dimensional twisted structure; the nano ceramic coating forms a compact protective layer on the surface of the fan blade body, erosion of dust, moisture and corrosive gas to a base material of the fan blade body can be effectively blocked, the problem that a traditional fan blade is prone to corrosion is solved, airflow forms a laminar flow boundary layer on the surface of the fan blade body, turbulence loss is reduced, and friction resistance is reduced. The hollow cavity is filled with the aluminum-magnesium alloy foam, so that the torsional rigidity of the fan blade body is remarkably improved compared with that of a pure hollow structure, and distortion under high-speed rotation or complex loads is effectively restrained.

Description

Technical Field

[0001] This utility model relates to the field of industrial fan blade technology, and specifically discloses a streamlined industrial fan blade. Background Technology

[0002] Industrial fan blades, as core components of industrial ventilation and heat dissipation systems, are widely used in factory environmental control, large equipment cooling, and warehouse air circulation. Their performance directly affects ventilation efficiency, energy consumption, and equipment operational reliability. Driven by a three-dimensional twisted structure, the fan blades must achieve high-flow-rate air delivery, low-noise operation, and long-term stable operation while rotating at high speeds. Therefore, stringent requirements are placed on the stability of the fan blades.

[0003] However, existing industrial fan blades have significant technical defects: First, they lack surface protection measures, making them prone to corrosion when exposed to dust, moisture, corrosive gases, and other environments for extended periods. Second, traditional fan blades often use simple curved or straight cross-sections with high surface roughness, resulting in high frictional resistance when airflow passes through them. This not only increases motor energy consumption but also easily generates high-frequency noise due to eddies. Third, most fan blades are designed with hollow cavities to reduce weight, generally lacking effective reinforcement methods. This leads to insufficient torsional stiffness of the blades, making them prone to twisting and deformation under high-speed rotation or complex loads. This affects air delivery stability and exacerbates vibration, severely restricting the application of industrial fans in high-load scenarios.

[0004] Therefore, a streamlined industrial fan blade is needed to solve the above problems. Utility Model Content

[0005] This invention proposes a streamlined industrial fan blade that effectively prevents the blade body from rusting through surface protection design; reduces wind resistance by optimizing surface roughness, thereby reducing motor energy consumption and noise; and enhances the torsional stiffness of the blade body through structural reinforcement, preventing twisting deformation and significantly improving air delivery stability.

[0006] This utility model is implemented as follows: a streamlined industrial fan blade includes a main shaft, three connecting shafts arranged in a circumferential array are fixedly connected to the outer wall of the main shaft, the other end of each of the three connecting shafts is fixedly connected to a mounting plate, and the other end of each of the three mounting plates is fixedly connected to a fan blade body.

[0007] The fan blade body has a three-dimensional twisted structure. A hollow cavity is opened at one end of the fan blade body near the mounting plate. One side of the fan blade body is a flat part, and the other side of the fan blade body is a curved part. There is a bulge between the flat part and the curved part. The flat part of the fan blade body is curved downward.

[0008] The hollow cavity is filled with metal foam;

[0009] The outer wall of the fan blade body is coated with a nano-ceramic coating.

[0010] As a preferred embodiment of the streamlined industrial fan blade of this utility model, the blade body is made of glass fiber reinforced polypropylene.

[0011] As a preferred embodiment of the streamlined industrial fan blade of this utility model, the metal foam is made of aluminum-magnesium alloy.

[0012] As a preferred embodiment of the streamlined industrial fan blade of this utility model, the nano-ceramic coating is composed of alumina, zirconium oxide and silicon carbide, with a surface roughness Ra≤0.5μm and a hardness≥1200HV.

[0013] As a preferred embodiment of the streamlined industrial fan blade of this utility model, the metal foam is filled into the hollow cavity through a liquid metal foaming process, and forms a metallurgical bonding interface with the inner wall of the hollow cavity.

[0014] As a preferred embodiment of the streamlined industrial fan blade of this utility model, the mounting plate and the connecting shaft are fixedly connected by two reinforcing ribs.

[0015] The beneficial effects of this utility model are:

[0016] 1. The nano-ceramic coating forms a dense protective layer on the surface of the fan blade, which can effectively block the erosion of the fan blade substrate material by dust, moisture and corrosive gases, and solve the problem of easy corrosion of traditional fan blades.

[0017] 2. The nano-ceramic coating has a small surface roughness, which causes the airflow to form a laminar boundary layer on the surface of the fan blade, reducing turbulent losses, reducing frictional resistance, and thus reducing motor energy consumption and eddy noise.

[0018] 3. Aluminum-magnesium alloy foam is filled into the hollow cavity, which not only achieves lightweighting but also significantly improves the torsional stiffness of the fan blade body compared to a pure hollow structure, effectively suppressing torsional deformation under high-speed rotation or complex loads. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 This is an overall structural diagram of a streamlined industrial fan blade according to the present invention;

[0021] Figure 2This is a partially exploded structural diagram of the present invention;

[0022] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a partial side view of the structure of this utility model.

[0024] The markings in the diagram are: 1. Main shaft; 2. Connecting shaft; 3. Mounting plate; 4. Fan blade body; 5. Flat section; 6. Curved section; 7. Bulging section; 8. Metal foam; 9. Hollow cavity; 10. Nano-ceramic coating; 11. Reinforcing rib. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0026] Please see Figure 1-4 A streamlined industrial fan blade includes a main shaft 1, with three connecting shafts 2 arranged in a circular array fixedly connected to the outer wall of the main shaft 1, and mounting plates 3 fixedly connected to the other ends of the three connecting shafts 2, and fan blade bodies 4 fixedly connected to the other ends of the three mounting plates 3.

[0027] The fan blade body 4 has a three-dimensional twisted structure. A hollow cavity 9 is provided at one end of the fan blade body 4 near the mounting plate 3. One side of the fan blade body 4 is a flat part 5, and the other side of the fan blade body 4 is a curved part 6. Between the flat part 5 and the curved part 6 is a bulge part 7. The flat part 5 of the fan blade body 4 is curved downward.

[0028] The hollow cavity 9 is filled with metal foam 8;

[0029] The outer wall of the fan blade body 4 is coated with a nano-ceramic coating 10.

[0030] In this embodiment: when the motor drives the main shaft 1 to rotate, the three fan blade bodies 4 rotate synchronously through the connecting shafts 2 and mounting plates 3 distributed in a circular array, forming an axial airflow to achieve the ventilation function. The downward curving geometry of the flat part 5 of the fan blade body 4, combined with the arc design of the curved part 6, creates a pressure gradient on the surface of the fan blade body 4, guiding the airflow along the axial direction, improving the air delivery efficiency, and the overall streamlined structure further optimizes the aerodynamic performance.

[0031] The nano-ceramic coating 10 forms a dense protective layer on the surface of the fan blade body 4, which can effectively block the erosion of the base material of the fan blade body 4 by dust, moisture and corrosive gases, solving the problem of easy corrosion of traditional fan blades. At the same time, the nano-ceramic coating 10 has a small surface roughness, which makes the airflow form a laminar boundary layer on the surface of the fan blade body 4, reducing turbulent loss, reducing frictional resistance, and thus reducing motor energy consumption and eddy noise.

[0032] Aluminum-magnesium alloy foam 8 is filled into the hollow cavity 9 through a liquid foaming process, forming a metallurgical interface with the inner wall of the hollow cavity 9. This achieves a lightweight design (the metal foam 8 has low density and light weight) while significantly improving the torsional stiffness of the fan blade body 4 compared to a pure hollow structure, effectively suppressing torsional deformation under high-speed rotation or complex loads. The metallurgical interface between the metal foam 8 and the hollow cavity 9 ensures reliable connection in long-term vibration environments, avoiding the risk of delamination.

[0033] As a technical optimization of this utility model, the fan blade body 4 is made of glass fiber reinforced polypropylene.

[0034] In this embodiment: the fan blade body 4 is made of glass fiber reinforced polypropylene material. The high strength of glass fiber is used to improve the tensile and torsional properties of the blade and adapt to the complex loads during high-speed rotation; the polypropylene matrix gives the blade the advantage of lightweighting, reducing rotational inertia and motor load.

[0035] As a technical optimization of this utility model, the metal foam 8 is made of aluminum-magnesium alloy material.

[0036] In this embodiment: the metal foam 8 is made of aluminum-magnesium alloy, whose lightweight and high-strength characteristics, combined with the hollow cavity 9, provide effective internal support while reducing the weight of the blade.

[0037] As a technical optimization of this utility model, the nano-ceramic coating 10 is composed of alumina, zirconium oxide and silicon carbide, with a surface roughness Ra≤0.5μm and a hardness≥1200HV.

[0038] In this embodiment: the nano-ceramic coating 10 is composed of alumina, zirconium oxide and silicon carbide, forming a multi-layer protective structure on the surface of the fan blade body 4: alumina and silicon carbide provide a high-hardness wear-resistant layer to resist dust erosion; zirconium oxide enhances the toughness of the coating and prevents cracking; the smooth coating surface reduces airflow turbulence, reduces frictional resistance and noise, and at the same time isolates external corrosive media from contact with the substrate material.

[0039] As a technical optimization of this utility model, the metal foam 8 is filled into the hollow cavity 9 through a liquid metal foaming process, and forms a metallurgical bonding interface with the inner wall of the hollow cavity 9.

[0040] In this embodiment, the metal foam 8 is filled into the hollow cavity 9 through a liquid metal foaming process. At high temperature, it forms a metallurgical bond with the inner wall of the hollow cavity 9, making the foam and the fan blade body 4 a unified force-bearing whole, uniformly distributing the load, improving the torsional stiffness of the fan blade body 4, avoiding the interface separation problem of traditional filling methods, and enhancing the reliability under long-term vibration environment.

[0041] As a technical optimization of this utility model, two reinforcing ribs 11 are fixedly connected between the mounting plate 3 and the connecting shaft 2.

[0042] In this embodiment, the connection strength between the mounting plate 3 and the connecting shaft 2 is increased by setting the reinforcing rib 11.

[0043] The working principle and usage of this utility model are as follows: When the motor drives the main shaft 1 to rotate, the three fan blade bodies 4 rotate synchronously through the circumferentially arrayed connecting shafts 2 and mounting plates 3, forming an axial airflow to achieve ventilation. The downward curving geometry of the flat portion 5 of the fan blade body 4, combined with the arc design of the curved portion 6, creates a pressure gradient on the surface of the fan blade body 4, guiding the airflow axially, improving air delivery efficiency, and the overall streamlined structure further optimizes aerodynamic performance.

[0044] The nano-ceramic coating 10, composed of alumina, zirconium oxide, and silicon carbide, has a hardness ≥1200HV and forms a dense protective layer on the surface of the fan blade body 4. This effectively blocks dust, moisture, and corrosive gases from eroding the base material of the fan blade body 4, solving the problem of easy corrosion in traditional fan blades. Simultaneously, the surface roughness Ra of the nano-ceramic coating 10 is ≤0.5μm, causing the airflow to form a laminar boundary layer on the surface of the fan blade body 4, reducing turbulent losses, lowering frictional resistance, and consequently reducing motor energy consumption and eddy current noise.

[0045] Aluminum-magnesium alloy foam 8 is filled into the hollow cavity 9 through a liquid foaming process, forming a metallurgical interface with the inner wall of the hollow cavity 9. This achieves a lightweight design (the metal foam 8 has low density and light weight) while significantly improving the torsional stiffness of the fan blade body 4 compared to a pure hollow structure, effectively suppressing torsional deformation under high-speed rotation or complex loads. The metallurgical interface between the metal foam 8 and the hollow cavity 9 ensures reliable connection in long-term vibration environments, avoiding the risk of delamination.

[0046] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", 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.

[0047] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A streamlined industrial fan blade, comprising a main shaft (1), characterized in that: The outer wall of the main shaft (1) is fixedly connected to three connecting shafts (2) arranged in a circular array. The other end of each of the three connecting shafts (2) is fixedly connected to a mounting plate (3), and the other end of each of the three mounting plates (3) is fixedly connected to a fan blade body (4). The fan blade body (4) has a three-dimensional twisted structure. A hollow cavity (9) is provided at one end of the fan blade body (4) near the mounting plate (3). One side of the fan blade body (4) is a flat part (5), and the other side of the fan blade body (4) is a curved part (6). There is a bulge part (7) between the flat part (5) and the curved part (6). The flat part (5) of the fan blade body (4) is bent downward. The hollow cavity (9) is filled with metal foam (8); The outer wall of the fan blade body (4) is coated with a nano-ceramic coating (10).

2. The streamlined industrial fan blade according to claim 1, characterized in that: The fan blade body (4) is made of glass fiber reinforced polypropylene.

3. The streamlined industrial fan blade according to claim 1, characterized in that: The metal foam (8) is made of aluminum-magnesium alloy.

4. The streamlined industrial fan blade according to claim 1, characterized in that: The nano-ceramic coating (10) is composed of alumina, zirconium oxide and silicon carbide, with a surface roughness Ra≤0.5μm and a hardness≥1200HV.

5. A streamlined industrial fan blade according to claim 1, characterized in that: The metal foam (8) is filled into the hollow cavity (9) by liquid metal foaming process and forms a metallurgical bonding interface with the inner wall of the hollow cavity (9).

6. A streamlined industrial fan blade according to claim 1, characterized in that: The mounting plate (3) and the connecting shaft (2) are fixedly connected by two reinforcing ribs (11).

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