Multiple surge-reducing ventilating vane

Abstract

The invention provides a ventilator blade, which is designed to be bend backward in shape and a small opening is opened in the middle of the blade to from a staggered diversion slot and the outlet edge of the blade or the edge of a volute tongue is inclined with an axis; in this way, the ventilator can lead to the impulse flow acted on the volute tongue to stagger, which reduces the impulsive force on the volute tongue and decreases the rotational noise; furthermore, a part of the high pressure draught at the pressure side is blown to the non-working face through small slots, which blows away the detaching vortices, improves the flow and decreases the vortices noise.

Description

technical field

[0001] The invention relates to a ventilator technology, especially the blade technology of the ventilator. Background technique

[0002] Under the joint action of electromagnetic noise, mechanical noise, and aerodynamic noise, the current ventilator has relatively large noise; especially aerodynamic rotating noise and aerodynamic vortex noise account for a relatively large proportion, which is likely to cause noise pollution and affect the working environment. Contents of the invention

[0003] The invention provides a fan blade with low noise.

[0004] For realizing the above object, technical scheme of the present invention is:

[0005] A blade of a ventilator is characterized in that the blade is made into a backward curved shape, a small opening is opened in the middle of the blade to form a staggered diversion seam, and the air outlet edge of the blade or the edge line of the volute tongue is inclined to the axis.

[0006] In this way, the fan can s...