Fan impeller and fan

Abstract

The application discloses a fan impeller, which includes a plurality of blade teeth. The blade teeth have a blade crest. The outer surface of the blade crest is a circular arc surface. The distance from the top of the rib to the center of the impeller is equal to the radius of the impeller. The wide rib makes the blade top have a larger machining area, which can allow / adapt to the larger "error rate" of the CNC lathe, and facilitate the subsequent reprocessing process, so that it can Precisely machining the impeller with "the distance from the tip to the center of the impeller equal to the radius of the impeller" makes up for the "deviation" problem in the process from theoretical design to product molding. The present application also provides a fan, including a casing and an impeller arranged in the casing and adapted to the casing. The impeller is the fan impeller as described above, which not only facilitates the processing and manufacture of the fan, but also seals the impeller and the casing. Good, low leakage, low fan noise, smooth operation, high stability and wear resistance, long service life.

Description

technical field [0001] The present application relates to the technical field of Roots fans, in particular to a fan impeller and a fan. Background technique [0002] Roots blower is a positive displacement blower, which utilizes the relative motion of the rotor to realize gas transportation or compression. It is widely used because of its simple structure and convenient manufacturing. The Roots blower generally includes several parts such as the casing and the impeller in the casing. The impeller as the rotating part is the key part of the Roots blower, and the precision of the impeller has a great influence on the performance of the blower. [0003] Usually the Roots blower has two impellers that match each other, and the impellers rotate relative to each other in the casing, such as figure 2 As shown in the figure, 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 a...

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

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