Low-noise fan for classroom
A low-noise, classroom-based technology, applied to parts of pumping devices for elastic fluids, non-variable pumps, pump devices, etc., can solve problems such as distraction, distracted students, and teachers affecting educational effects, etc., to achieve Reduce noise and increase the effect of blowing range
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Embodiment 1
[0023] Such as figure 1 As shown, a low-noise classroom fan includes a motor 1, a fixed seat 2 arranged at the lower end of the motor 1, and a fan blade 3 connected to the fixed seat 2; it also includes shields connected to the left and right sides of the fixed seat 2 4 and the sound-absorbing unit 5 that is fixed on fan blade 3 around.
[0024] In this embodiment, the baffles 4 arranged on the left and right sides of the fixed seat 2 will guide the wind force, and the noise reduction unit 5 arranged around the fan blade 3 will reduce the noise generated by the rotation of the fan blade 3 to ensure student's listening efficiency.
Embodiment 2
[0026] In this embodiment, on the basis of Embodiment 1, the noise reduction unit 5 includes an acoustic wave induction device 6 that converts noise into a first electrical signal, and an acoustic wave induction device connected to the acoustic wave induction device 6 that converts the first electrical signal into equal magnitude and opposite phase The processing chip 7 that outputs the second electric signal and the sound wave generator 8 that is connected to the output end of the processing chip 7 and converts the second electric signal into sound waves; . The acoustic wave induction device 6 , the processing chip 7 and the acoustic wave generator 8 are evenly arranged on the inner wall of the shield 4 .
[0027] In this embodiment, the noise generated by the rotation of the fan blade 3 is processed by the acoustic wave induction device 6 and the processing chip 7 in sequence, and then the acoustic wave generator 8 will produce an acoustic wave that is equal in magnitude to ...
Embodiment 3
[0029] In this embodiment, on the basis of embodiment 1 or embodiment 2, the shield 4 is an arc-shaped structure.
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