Noise reduction volute tongue structure and centrifugal fan
A volute and noise volute technology, applied in the field of noise reduction volute and centrifugal fan, can solve the problems of low efficiency of centrifugal fan, difficulty in coordinating efficiency and noise, increase in noise, etc., so as to increase the effective flow area, suppress superposition, Impact reduction effect
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Embodiment 1
[0033] This embodiment discloses a noise reduction volute tongue structure, such as image 3 As shown, the volute tongue structure includes a volute tongue body 31 formed by the shell wall at the junction of the volute case 1 and the air outlet 2 and a plurality of protrusions 32 arranged on the top of the volute tongue body 31 . The volute tongue body 31 in this embodiment is a relatively common volute tongue structure currently on the market. A plurality of protruding blocks 32 are distributed sequentially along the axial direction of the volute 1 , and an air flow channel 33 for air flow is provided between adjacent protruding blocks 32 . The setting of the protruding block 32 can effectively prevent the airflow from continuing to circulate inside the cavity, causing the loss of the flow rate and reducing the efficiency of the fan. At the same time, the setting of the airflow channel 33 can reduce the impact of the airflow on the volute tongue structure, effectively reducin...
Embodiment 2
[0041] This embodiment discloses a noise reduction centrifugal fan, such as figure 1 As shown, the centrifugal fan includes a volute 1, an air outlet 2, an impeller blade 4 and an impeller shaft arranged in the volute, and a volute tongue 3 is provided at the connection between the volute and the air outlet, and the volute tongue 3 is the embodiment 1 Documented noise-reducing cochlear tongue structure. The fixing positions of the first protruding piece 321 and the second protruding piece 322 in the volute tongue are set according to the dimensions and distances described in Embodiment 1.
[0042] The centrifugal fan of this embodiment is tested in actual engineering practice, and the test results show that, compared with the centrifugal fan with the traditional volute tongue structure, the noise of the centrifugal fan can be reduced by 100% when the outlet pressure and operating efficiency remain unchanged. 15-20dB; under the condition that the noise of the centrifugal fan i...
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