Lightweight corrosion-resistant axial flow fan blade

Abstract

The patent discloses a kind of light weight corrosion-resistant axial flow fan blade, including flange plate and fan main shaft, the outer wall of flange plate is fixedly installed with glass fiber reinforced polypropylene fan blade, the middle part of flange plate is equipped with square hole, the left side of flange plate four end positions are equipped with mounting hole, the left end of fan main shaft is integrally formed with square column, square column left end extends to left side through square hole, the fan blade of this scheme is set by glass fiber reinforced polypropylene, the density of this material is only 1.1-1.3g / cm3, compared with traditional metal blade (such as aluminum alloy density 2.7g / cm3) weight loss is more than 50%, meet the demand of light weight;And cost is lower, processing difficulty is small, it is suitable for simple production, by setting the side wall of square column contact and adhere to the inner side wall of square hole, can cooperate with threaded rod common load fan main shaft rotates and the relative force of blade with heavy quality, improve the service life of overall structure.

Description

Technical Field

[0001] This patent relates to the field of wind turbine blade technology, specifically a lightweight and corrosion-resistant axial flow wind turbine blade. Background Technology

[0002] Traditional axial flow fan blades are mostly made of metal, which are heavy, placing a significant burden on the motor and exhibiting poor corrosion resistance. Furthermore, the connection between the traditional fan flange and the fan shaft is secured by threaded rods and nuts. The heavy metal blades on the flange further increase the blade weight, and the relative force generated by the rotating fan shaft and the heavy blades directly acts on the threaded rod, potentially causing it to break over time. Therefore, we propose a lightweight, corrosion-resistant axial flow fan blade. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this patent is to provide a lightweight and corrosion-resistant axial flow fan blade. This solution utilizes glass fiber reinforced polypropylene blades, which have a density of only 1.1-1.3 g / cm³, resulting in a weight reduction of over 50% compared to traditional metal blades (such as aluminum alloy with a density of 2.7 g / cm³), thus meeting the lightweight requirements. Simultaneously, it possesses excellent acid and alkali resistance, as well as resistance to damp heat, enabling it to withstand corrosive media in common industrial or outdoor environments. Furthermore, it is cost-effective, easy to manufacture, and suitable for simple production. By setting the sidewalls of square columns to contact and adhere to the inner wall of square holes, it can work in conjunction with threaded rods to bear the relative forces generated by the rotation of the fan shaft and the heavy blades, thereby improving the overall structural lifespan.

[0004] The technical solution adopted by this patent to solve its technical problem is: a lightweight and corrosion-resistant axial flow fan blade, including a flange and a fan main shaft, wherein glass fiber reinforced polypropylene fan blades are fixedly installed on the outer side wall of the flange. The flange has a square hole in the middle and mounting holes at all four ends of the left side of the flange. A square column is integrally formed at the left end of the fan main shaft. The left end of the square column extends to the left side through the square hole. The four sides of the side wall of the square column are respectively in contact with and fit against the four sides of the inner side wall of the square hole. A bearing ring is fixedly installed on the outer side wall of the fan main shaft. Threaded rods are fixedly installed at all four ends of the left side of the bearing ring. The left end of the threaded rod passes through the mounting hole and is screwed with a nut. The right side of the nut is tightly fitted to the left side of the flange, and the right side of the flange is tightly fitted to the left side of the bearing ring.

[0005] Furthermore, the glass fiber reinforced polypropylene fan blade is provided with a protective coating on its exterior.

[0006] Furthermore, the protective coating is a polytetrafluoroethylene coating.

[0007] Furthermore, the glass fiber reinforced polypropylene fan blade has an internal cavity. Hollow reinforcing ribs are fixedly installed inside the cavity.

[0008] Furthermore, a circular plate is provided, with a threaded column integrally formed in the middle of the right side surface of the circular plate, and a threaded groove provided in the middle of the left end of the square column. The right end of the threaded column is screwed into the threaded groove, and the edge of the right side surface of the circular plate is tightly fitted to the left side surface of the nut.

[0009] Furthermore, a cross groove is provided in the middle of the left side surface of the circular plate.

[0010] Furthermore, a rubber ring is embedded at the right edge of the circular plate, and the rubber ring is tightly fitted to the left side of the nut.

[0011] The beneficial effects of this patent are: 1. This solution uses glass fiber reinforced polypropylene fan blades, which have a density of only 1.1-1.3 g / cm³, reducing weight by over 50% compared to traditional metal blades (such as aluminum alloy with a density of 2.7 g / cm³), thus meeting the requirements for lightweight design. It also possesses excellent resistance to acids, alkalis, and damp heat, resisting corrosive media in common industrial or outdoor environments. Furthermore, it is low-cost, easy to process, and suitable for simple production. By having the sidewalls of square columns contact and adhere to the inner wall of square holes, it can work in conjunction with threaded rods to bear the relative forces generated by the rotation of the fan shaft and the heavy blades, thereby improving the overall structural lifespan. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the entire patent.

[0013] Figure 2 This is a schematic diagram of the flange and glass fiber reinforced polypropylene fan blades of this product.

[0014] Figure 3 This is a cross-sectional view of the glass fiber reinforced polypropylene fan blade of this patent.

[0015] Figure 4 This is a partial structural diagram of this patent.

[0016] Explanation of reference numerals in the attached drawings: 1. Flange; 2. Glass fiber reinforced polypropylene fan blade; 3. Square hole; 4. Mounting hole; 5. Fan main shaft; 6. Square column; 7. Bearing ring; 8. Threaded rod; 9. Nut; 10. Protective coating; 11. Hollow reinforcing rib; 12. Threaded groove; 13. Threaded column; 14. Round plate; 15. Cross groove; 16. Rubber ring. Detailed Implementation

[0017] The present patent is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the patent. Furthermore, it should be understood that after reading the teachings of this patent, those skilled in the art can make various alterations or modifications to this patent, and these equivalent forms also fall within the scope defined by the appended claims.

[0018] See Figure 1 , Figure 2 , Figure 3 and Figure 4 This is a schematic diagram of the structure of this patent, a lightweight and corrosion-resistant axial flow fan blade, including a flange 1 and a fan main shaft 5, with glass fiber reinforced polypropylene fan blades 2 fixedly installed on the outer wall of the flange 1. As a core functional component, the fan blade is made of glass fiber reinforced polypropylene (FRPP), with a density of only 1.1-1.3 g / cm³, reducing weight by more than 50% compared to traditional metal blades. The acid and alkali resistance and humid heat resistance of polypropylene, combined with the improved bending and fatigue resistance of glass fiber, not only meet the requirements for lightweighting but also prevent deformation and breakage during operation. Furthermore, it has low processing costs and can be mass-produced through injection molding. To further enhance performance, the fan blade is coated with a polytetrafluoroethylene (PTFE) protective coating. This coating can withstand acidic and alkaline environments with pH values ​​of 2-12, reduces dust adhesion to lower wind resistance, and can be applied by simply air-drying at room temperature without the need for high-temperature equipment. The internal structure of the fan blade is integrally injection-molded with FRPP to form hollow reinforcing ribs, further reducing material usage by 10%-15% while enhancing the structural support of the blade and avoiding the fragility issues associated with lightweighting.

[0019] A square hole 3 is provided in the middle of the flange 1, and mounting holes 4 are provided at all four ends of the left side of the flange 1. A square column 6 is integrally formed at the left end of the fan main shaft 5. The left end of the square column 6 extends to the left side through the square hole 3. The four sides of the side wall of the square column 6 are respectively in contact with and fit against the four sides of the inner side wall of the square hole 3. A bearing ring 7 is fixedly installed on the outer side wall of the fan main shaft 5. Threaded rods 8 are fixedly installed at all four ends of the left side of the bearing ring 7. The left end of the threaded rod 8 passes through the mounting hole 4 and is screwed with a nut 9. The right side of the nut 9 is tightly fitted to the left side of the flange 1, and the right side of the flange 1 is tightly fitted to the left side of the bearing ring 7.

[0020] Traditional axial flow fans mostly have metal blades, which are heavy, put a heavy burden on the motor, and have poor corrosion resistance.

[0021] This solution uses glass fiber reinforced polypropylene fan blades, which have a density of only 1.1-1.3 g / cm³, reducing weight by more than 50% compared to traditional metal blades (such as aluminum alloy with a density of 2.7 g / cm³), thus meeting the requirements for lightweighting. At the same time, it has good resistance to acids and alkalis and damp heat, and can resist corrosive media in common industrial or outdoor environments. It is also low in cost and easy to process, making it suitable for simple production.

[0022] Furthermore, the traditional connection between the fan flange and the fan main shaft is fixed by threaded rods and nuts. The heavy metal blades on the flange will increase the weight of the blades. When the fan main shaft rotates, the relative force generated by the heavy blades will directly act on the threaded rod, which can easily cause the threaded rod to break over time.

[0023] This solution involves setting the side wall of the square column 6 to contact and adhere to the inner side wall of the square hole 3, which, together with the threaded rod 8, can bear the relative force generated by the rotation of the main shaft of the fan and the heavy blades, thereby improving the service life of the overall structure.

[0024] Among the load-bearing and connecting components, flanges, fan main shafts, bearing rings, threaded rods, nuts, round plates, and threaded columns are primarily made of metal, balancing strength and compatibility. For flanges, aluminum alloy or 304 stainless steel is recommended. Aluminum alloy has low density, balancing lightweight and machinability, while 304 stainless steel is more suitable for corrosive environments. Both are easy to machine, ensuring the dimensional accuracy of square holes and mounting holes. For the fan main shaft, 45# steel or 304 stainless steel is recommended. 45# steel, after tempering, has excellent hardness and toughness, while 304 stainless steel improves corrosion resistance. Both can meet the machining requirements of one-piece molded square columns, preventing breakage at the joint. Bearing rings are recommended to be made of the same material as the main shaft or aluminum alloy. Using the same material enhances the connection stability with the main shaft, while aluminum alloy further reduces weight. Threaded rods and nuts are recommended to be made of 304 stainless steel or high-strength galvanized steel. High corrosion resistance is essential. Galvanized steel is low-cost and provides basic rust prevention. The materials used in both materials must be compatible to avoid electrochemical corrosion and ensure thread fit accuracy and locking stability. For the round plate and one-piece threaded post, aluminum alloy or 304 stainless steel are recommended. These metal materials have high hardness, are easy to machine into cross-grooves and threaded structures, and can stably tighten the nut without easily damaging it over long-term use. Furthermore, for the rubber ring at the contact point between the round plate and the nut, nitrile rubber or silicone rubber is recommended. Nitrile rubber is oil-resistant and wear-resistant, suitable for industrial environments, while silicone rubber is resistant to high and low temperatures and aging, suitable for outdoor applications. The elastic filling of the gap enhances the tightening effect.

[0025] Specifically, the glass fiber reinforced polypropylene fan blade 2 has a protective coating 10 on its exterior.

[0026] Specifically, the protective coating 10 is a polytetrafluoroethylene (PTFE) coating.

[0027] After cleaning the surface of the molded glass fiber reinforced polypropylene fan blade 2, evenly spray 1-2 layers of PTFE coating (50-80μm thick) and allow it to air dry at room temperature. This coating not only further improves corrosion resistance (withstanding acidic and alkaline environments with pH 2-12), but also reduces dust adhesion on the blade surface, lowers wind resistance, and the construction process is simple, requiring no high-temperature baking equipment.

[0028] Specifically, the glass fiber reinforced polypropylene fan blade 2 has an internal cavity, and a hollow reinforcing rib 11 is fixedly installed inside the cavity.

[0029] The glass fiber reinforced polypropylene fan blade 2 has two parallel "hollow reinforcing ribs" arranged along its length. The ribs are 8-10mm wide and 15-20mm high, which reduces the amount of material used (further reducing the weight by 10%-15%) and enhances the bending strength of the blade, avoiding structural fragility due to lightweighting.

[0030] Specifically, a circular plate 14 is also provided, and a threaded post 13 is integrally formed in the middle of the right side of the circular plate 14. A threaded groove 12 is provided in the middle of the left end of the square post 6. The right end of the threaded post 13 is screwed into the threaded groove 12. The edge of the right side of the circular plate 14 is tightly fitted to the left side of the nut 9.

[0031] By tightening the round plate 14, the right edge of the round plate 14 is tightly fitted to the left side of the nut 9, which can further increase the fixing effect of the nut 9 and prevent it from falling off due to loosening.

[0032] Specifically, a cross groove 15 is provided in the middle of the left side of the circular plate 14.

[0033] The Phillips head slot 15 is designed to facilitate easy rotation by inserting a Phillips head screwdriver into it.

[0034] Specifically, a rubber ring 16 is embedded at the right edge of the circular plate 14, and the rubber ring 16 is tightly fitted to the left side of the nut 9.

[0035] The rubber ring 16 can increase the tightening effect of the contact position between the round plate 14 and the nut 9.

[0036] Working principle: This solution uses glass fiber reinforced polypropylene fan blades, which have a density of only 1.1-1.3 g / cm³, reducing weight by more than 50% compared to traditional metal blades (such as aluminum alloy with a density of 2.7 g / cm³), thus meeting the requirements for lightweight design. It also possesses excellent acid and alkali resistance and resistance to damp heat, resisting corrosive media in common industrial or outdoor environments. Furthermore, it is low-cost and easy to process, making it suitable for simple production. The sidewalls of the square columns 6 are in contact with and adhere to the inner wall of the square holes 3, working in conjunction with the threaded rods 8 to bear the relative force generated by the rotation of the fan shaft and the heavy blades, thereby improving the overall service life of the structure.

[0037] It should be noted that the device structure and accompanying drawings of this patent mainly describe the principle of this patent. In terms of the technical aspects of this design principle, the setting of the device's power mechanism, power supply system and control system is not fully described. However, those skilled in the art who understand the principle of the above patent can clearly understand the specifics of its power mechanism, power supply system and control system.

[0038] This solution utilizes glass fiber reinforced polypropylene (GFRP) blades, a material with a density of only 1.1-1.3 g / cm³, resulting in a weight reduction of over 50% compared to traditional metal blades (such as aluminum alloy with a density of 2.7 g / cm³), thus meeting lightweight requirements. It also possesses excellent acid and alkali resistance, as well as resistance to damp heat, enabling it to withstand corrosive media in common industrial or outdoor environments. Furthermore, it is cost-effective, easy to manufacture, and suitable for simple production. By having the sidewalls of square columns contact and adhere to the inner wall of square holes, it can work in conjunction with threaded rods to bear the relative forces generated by the rotation of the fan shaft and the heavy blades, thereby improving the overall structural lifespan.

[0039] In the description of this patent, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," and "both ends," 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 patent 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. At the same time, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "fixed installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two elements or the interaction relationship between two elements. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0040] Although embodiments of this patent have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this patent, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight, corrosion-resistant axial flow fan blade, characterized in that: Includes a flange (1) and a fan shaft (5), wherein glass fiber reinforced polypropylene fan blades (2) are fixedly installed on the outer side wall of the flange (1). The flange (1) has a square hole (3) in the middle. The flange (1) has mounting holes (4) at all four ends of the left side. The left end of the fan main shaft (5) has a square column (6) integrally formed. The left end of the square column (6) extends to the left side through the square hole (3). The four sides of the side wall of the square column (6) are respectively in contact with the four sides of the inner side wall of the square hole (3). The outer side wall of the fan main shaft (5) is fixedly installed with a bearing ring (7). The four ends of the left side of the bearing ring (7) are fixedly installed with threaded rods (8). The left end of the threaded rod (8) passes through the mounting hole (4) and is screwed with a nut (9). The right side of the nut (9) is tightly fitted to the left side of the flange (1), and the right side of the flange (1) is tightly fitted to the left side of the bearing ring (7).

2. The lightweight corrosion-resistant axial flow fan blade according to claim 1, characterized in that: The glass fiber reinforced polypropylene fan blade (2) is provided with a protective coating (10) on its exterior.

3. The lightweight corrosion-resistant axial flow fan blade according to claim 2, characterized in that: The protective coating (10) is a polytetrafluoroethylene (PTFE) coating.

4. The lightweight corrosion-resistant axial flow fan blade according to claim 1, characterized in that: The glass fiber reinforced polypropylene fan blade (2) has a cavity inside, and a hollow reinforcing rib (11) is fixedly installed inside the cavity.

5. The lightweight corrosion-resistant axial flow fan blade according to claim 1, characterized in that: A circular plate (14) is also provided. A threaded column (13) is integrally formed in the middle of the right side of the circular plate (14). A threaded groove (12) is provided in the middle of the left end of the square column (6). The right end of the threaded column (13) is screwed into the threaded groove (12). The edge of the right side of the circular plate (14) is tightly attached to the left side of the nut (9).

6. The lightweight corrosion-resistant axial flow fan blade according to claim 5, characterized in that: The circular plate (14) has a cross groove (15) in the middle of its left side surface.

7. The lightweight corrosion-resistant axial flow fan blade according to claim 5, characterized in that: A rubber ring (16) is embedded at the right edge of the circular plate (14), and the rubber ring (16) is tightly attached to the left side of the nut (9).

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