Axial flow fan stationary blade noise reduction structure based on memory alloy

Abstract

The invention discloses an axial flow fan stationary blade noise reduction structure based on a memory alloy. A memory alloy driver and trailing edge sawtooth sliding block mode is adopted, and the axial flow fan stationary blade noise reduction structure is restrained in an axial flow fan hollow stationary blade; and two groups of memory alloy drivers are fixed at the end of a slot channel on a machine box and a wheel hub. The trailing edge sawtooth sliding block is installed in the position, located on the side face of the trailing edge of the stationary blade, in the machine box and the wheel hub. A connecting rod of the trailing edge sawtooth sliding block is connected with the memory alloy drivers through a connecting loop. Under different rotating speeds, voltage is utilized to control the elongation amount of memory alloy wires, so that displacement of the trailing edge sawtooth sliding block is changed and is coincident with trailing tracing width, and wideband noise of the stationary blade trailing edge is reduced efficiently. Meanwhile, trailing tracing change of a low speed axial flow fan under the different rotating speeds is small, the adopted memory alloy driving way achieves control of millimeter level displacement, control precision is high, coincidence of the trailing edge sawtooth sliding block and the trailing tracing width is guaranteed, and the best effect of control is achieved.

Description

technical field [0001] The invention relates to the technical field of impeller machinery noise reduction, in particular to a noise reduction structure for stator blades of an axial flow fan based on a memory alloy. Background technique [0002] A turbomachinery is a power machine that exchanges energy with the air by means of continuously rotating blades. However, common impeller machines, such as axial flow fans, have great defects in dealing with noise problems. Noise can usually be divided into two categories: vibration noise and aerodynamic noise. Vibration noise is mainly generated by mechanical vibration, which is usually controlled by means of dynamic balance. The aerodynamic noise is generated by the turbulent pulsation in the flow field, and it is generally weakened by means of flow control technology, crushing and dredging the turbulent cluster. The axial flow fan is mainly realized by two basic parts, the rotor blade and the stator blade. The broadband noise r...

AI Technical Summary

Problems solved by technology

However, the tooth-shaped trailing edge axial flow fan has a fixed sawtooth structure width, which can achieve better noise reduction at a certain speed, but the noise reduction effect is not good at other speeds.

Moreover, the toothed trailing edge axial flow fan only reduces the noise of the rotor blade trailing edge, while for a turbomachinery with stationary blades, the stationary blades will radiate broadband noise

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