The invention provides a
noise reduction device and method and an outdoor direct-current charging
pile using the device. Air sequentially enters a front air inlet buffer part from an air inlet device,an air duct of a
noise reduction process device and an internal charging module of the
noise reduction process device, is output to an air outlet buffer part through a draught fan serving as airflowdirection source power, and then is exhausted through an air outlet device. Meanwhile, after passing through the air inlet buffer part, the
airflow is weakened through a first-stage
sieve pore plate and then enters a second-stage concave pore plate, collision and buffering are generated, sound
waves interfere with one another, the
airflow speed is reduced. In addition, sound absorption cotton is attached to the inner walls of the buffer parts, and the
airflow enters a third-stage
sieve pore plate after being weakened again and then enters the draught fan after being further weakened. The weakened airflow is sucked into the draught fan through air draft and is discharged to the air outlet buffer part. Similarly, after passing through the air outlet buffer part, the airflow is weakened by buffer sound
waves and further weakened through the air outlet device.
Noise pollution is reduced by the aid of the
noise reduction device, and disturbance to residents, poor user experience and temporary deafness of field personnel in operation and maintenance are reduced.