Fan blade wheel

Abstract

A fan blade wheel comprises blades (1) and a hub (2), wherein the blades (1) are distributed on the hub (2), each of the blades (1) is provided with a wide outer chord (13) and a narrow inner chord (14), the blade (1) positioned at the position of the outer chord (13) is provided with a fairshaped flap (15) which begins to extend to the rear end of the outer chord (13) from the position where the blade tip extends into 3%-30% of the length of the outer chord (13), and the rear edge (12) of each of the blades (1) is in a sawtooth shape. The fan blade wheel is characterized in that the inner chord (14) comprises a first inner chord (141) and a second inner chord (142), wherein a concave portion (16) is arranged on the surface of the blade (1) close to the second inner chord (142), the back surface at the bottom of the concave portion protrudes outwards from the other surface of the blade, and a connection mechanism connected with the hub (2) is arranged on the concave portion (16). The fan blade wheel has the advantages of being reasonable in structural design, high in operation stability, long in service life and good in application effect. By means of the fan blade wheel, the strength of the blades is high, energy is saved, and noise is low.

Description

technical field [0001] The invention relates to the technical field of an axial flow fan, in particular to a wind impeller of a fan with high structural strength and firmly fixed blades. Background technique [0002] With the rapid development of the country's economic construction, the air-conditioning system is becoming more and more popular. The evaporative condenser in the air-conditioning system is a very important unit in the entire air-conditioning system. The performance of the cooling fan directly affects the operation effect of the air conditioning system. The ultra-low-noise axial-flow fans for air-conditioning condensers are required to be compact in size, light in weight, and have good aerodynamic performance and noise indicators. Since the operation of air-conditioning fans is mainly in winter and summer, the operating conditions are different, so new requirements are put forward for the average operating efficiency of the fans in multiple working conditions. ...

AI Technical Summary

Problems solved by technology

However, the inner chord strength of this utility model is insufficient, and it is variable after long-term windward rotation. The use of reinforcing ribs in the fixed part of the blade and the hub increases the manufacturing cost, and also increases the centrifugal force of the blade, and the rotation stability decreases. The increased centrifugal force and stability The swing caused by the reduction may break the blade and affect its service life. At the same time, its structure only considers the improvement of the overall stiffness and strength of the blade, and does not effectively improve the fan's requirements for aerodynamic performance and acoustic indicators. Therefore, it is necessary to use the structure make further improvements

Images