Silencing device for reducing noise
A noise reduction device and noise reduction technology, applied in the direction of pipes/pipe joints/fittings, mechanical equipment, pipe components, etc., can solve the problem of adding resonators, etc., and achieve the effects of widening the noise reduction frequency band, saving space, and simple structure
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Embodiment 1
[0028] refer to figure 1 and figure 2 , the noise reduction device of this embodiment includes four side branch resonators 1, 2, 3, 4 and three Helmholtz resonator groups 5, 6, 7. The four side branch resonators 1, 2, 3, 4 The sizes should be exactly the same and arranged at equal intervals; the Helmholtz resonator groups 5, 6 and 7 are composed of one, two and three Helmholtz resonators respectively, and each Helmholtz resonator has a different size. One, three Helmholtz resonator groups 5, 6, 7 are inserted between the four side branch resonators 1, 2, 3, 4 respectively.
[0029] refer to Figure 5 It is the transmission loss curve obtained by the finite element calculation of the noise reduction device of this exemplary embodiment. It can be seen from the figure that the Helmholtz resonance inserted in the side branch resonator and the Helmholtz resonator is set in parallel in the above way The number of side branch resonators does not affect the resonance frequency of ...
Embodiment 2
[0031] refer to figure 1 and image 3 , the noise reduction device of this embodiment includes four side branch resonators 1, 2, 3, 4 and three Helmholtz resonator groups 5, 6, 7. The four side branch resonators 1, 2, 3, 4 The size should be exactly the same and arranged at equal intervals; the Helmholtz resonator groups 5, 6 and 7 are composed of two, two and three Helmholtz resonators respectively, and each Helmholtz resonator has a different size. One, three Helmholtz resonator groups 5, 6, 7 are inserted between the four side branch resonators 1, 2, 3, 4 respectively.
[0032] refer to Image 6 It is the transmission loss curve obtained by the finite element calculation of the noise reduction device of this exemplary embodiment. It can be seen from the figure that the Helmholtz resonance inserted in the side branch resonator and the Helmholtz resonator is set in parallel in the above way The number of side branch resonators does not affect the resonance frequency of sid...
Embodiment 3
[0034] refer to figure 1 and Figure 4 , the noise reduction device of this embodiment includes four side branch resonators 1, 2, 3, 4 and three Helmholtz resonator groups 5, 6, 7. The four side branch resonators 1, 2, 3, 4 The size should be exactly the same and arranged at equal intervals; the Helmholtz resonator groups 5, 6 and 7 are composed of two, two and three Helmholtz resonators respectively, and each Helmholtz resonator has a different size. One, three Helmholtz resonator groups 5, 6, 7 are inserted between the four side branch resonators 1, 2, 3, 4 respectively.
[0035] refer to Figure 7 It is the transmission loss curve obtained by the finite element calculation of the noise reduction device of this exemplary embodiment. It can be seen from the figure that the Helmholtz resonance inserted in the side branch resonator and the Helmholtz resonator is set in parallel in the above way The number of side branch resonators does not affect the resonance frequency of s...
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