To improve the motor fan blades, you can refer to the following aspects:
(1) About the blade material
The blade material should be light and hard. If conditions permit, it is better to use carbon fiber.
Pultruded fiberglass reinforced blades have good durability and corrosion resistance, are resistant to acid, alkali, and atmospheric corrosion. They do not require regular maintenance. They have uniform material, strong flexibility, consistent size, and standard weight. , smooth surface, and other characteristics. Mainly used for: wind turbines, wind water pumps, highway anti-glare boards.
Most rotor blades on large wind turbines are made of glass fiber reinforced plastic (GRP). Using carbon fiber or aramid as reinforcement is another option, but such blades are uneconomical for large wind turbines. Wood, epoxy wood, or epoxy wood fiber composites are not yet present in the rotor blade market, although there are developments in this area. Steel and aluminum alloys have problems such as weight and metal fatigue respectively. They are currently only used in small wind turbines.
(2) About blade structure
The variables on the blades are:
1. Number of blades. Theoretically, the more on the blades, the better, which can maximize the air in contact with the blades. But it is obviously not possible in practice. If it is too dense, the flow fields between the blades will interfere with each other. If they overlap, it will not be practical. If 3D printing is applied, it can greatly change the existing design ideas. If it is too thin, the efficiency will be low.
2. Blade cross-sectional shape. Because aircraft design and manufacturing has a long history, investment is large, the industry is developed, and there is a huge amount of aerodynamic data. Currently, aircraft airfoils are commonly used in blade airfoils, such as Göttingen airfoil, L-S airfoil, NACA series, and high-lift airfoil. type, etc. Each airfoil type has its own temperament and scope of application. Household fans and industrial fans don't have this problem. They are straight and can be rotated by an iron plate.
3. Installation angle (the inclination angle of the blade). In layman's terms, it is a problem of how to maximize the conversion of air into axial flow when the fan blades rotate. For fan blades, the degree of inclination between the blade root and the maximum outer diameter is different, that is, the inclination angle of each radius is different.
4. Deflection angle. That is, the bottom edge of the blade spreads out in a certain arc shape and does not radiate in a straight line. It can be understood here as the shape of the bottom edge, which can be straight or deflected to various angles; it can be arc-shaped with different curvatures; it can be elliptical, U-shaped, or W-shaped. All sorts of strange things.
The most important ones should be these four. The complexity lies in the fact that all factors are interrelated. Even the first number of leaves cannot tell which specific leaves are best. If the situation changes, everything changes. There are many situations for 2, 3, and 4, which can only be simplified during research, but simplification means abandoning many possibilities, so there is huge room for improvement in which shape has the greatest advantage.
In addition, there are other ways to cut off the leaf tips, add dorsal fins, open teeth at the bottom, etc., etc., etc., but they can only be discarded.
The suction power of the motor is small, usually due to windThe power of the fan motor is small, and the effect of changing the fan blades is small. If the fan blade angle is changed manually and the modification is not precise enough, it can easily cause imbalance and cause the fan to rotate at a lower speed. However, it is still necessary to improve the fan blades, because it can improve the operating efficiency of the motor to a certain extent and reduce the waste of electricity.