Fan impeller and fan

Abstract

The invention discloses a fan impeller. The fan impeller comprises a plurality of blade teeth, wherein each blade tooth is provided with a blade peak part; the outer surface of each blade peak part isan arc surface; a wide rib protruding out of each blade peak part is arranged at the top end of each blade tooth; the distance from the top end of each wide rib to the center of the impeller is equalto the radius of the impeller; and each wide rib enables the blade top to have a large machinable area, can allow / adapt to a large error rate of a numerical control lathe, and facilitates the subsequent reprocessing process, so that the impeller with the distance from the top end to the center of the impeller being equal to the radius of the impeller can be obtained through accurate processing,and the problem of deviation from theoretical design to the product forming process is solved. The invention further provides a fan. The fan comprises a casing and the impeller arranged in the casingand matched with the casing, wherein the impeller is the fan impeller. The fan is convenient to process and manufacture, the impeller and the casing are well sealed, the leakage rate is low, the fan noise is low, the operation is stable, the stability and the wear resistance are high, and the service life is long.

Description

technical field [0001] The present application relates to the technical field of Roots blower, in particular to a fan impeller and a fan. Background technique [0002] The Roots blower is a volumetric blower, which utilizes the relative movement of the rotor to realize gas delivery or compression. It is widely used because of its simple structure and convenient manufacture. The Roots blower generally includes several parts such as the casing and the impeller inside the casing. The impeller as a rotating part is the key component of the Roots blower. The precision of the impeller has a great influence on the performance of the fan. [0003] Usually the Roots blower has two matching impellers, and the impellers rotate relatively in the casing, such as figure 2 As shown, since each impeller adopts the envelope of circular arc, involute or epicycloid, the blade teeth of each impeller are exactly the same, and the two impellers are also exactly the same, which greatly reduces th...

AI Technical Summary

Problems solved by technology

[0004] Although the theoretical design of each blade of the impeller is identical, in the process of impeller machining, when the outer circle of the impeller is finally turned, due to the lack of precision of the numerical control equipment and the uneven hardness of the material, the blade peaks in the length direction of the impeller remain. The width of the blade varies, and if the deviation is large, the top of the blade peak will not be turned in the direction of the entire length of the impeller, resulting in increased fan leakage and flow exceeding the design standard tolerance; at the same time, increased air flow pulsation and high noise

Images