A detachable metal sintered wire mesh noise reduction device

Abstract

The invention discloses a detachable metal sintered wire mesh noise reduction device, which comprises a well-shaped support frame installed in a pipeline, a plurality of metal sintered wire mesh modules, and a plurality of front pressure plates; the metal sintered wire mesh module includes Front grid, M-layer metal sintered wire mesh, and rear grid; the front grid is used to suppress back pressure impact deformation, and the rear grid is used to suppress impact deformation in the direction of airflow; M-layer metal sintered wire mesh is laminated by laser sintering Metal sintered wire mesh, used for aerodynamic noise reduction in a wide frequency range; located between the front grille and the rear grille, the frame bars of the front grille and the rear grille are opposite and fixed together; multiple front pressure plates connect multiple The metal sintered wire mesh module is fixed on the well-shaped support frame by screws; the surroundings of the metal sintered wire mesh module are processed into concave and convex structures of different structures, which can be connected by concave and convex to reduce the blocking ratio of the well-shaped frame. The invention has reasonable and simple structure, convenient disassembly and installation, wide noise reduction frequency band, and can withstand relatively large impact load.

Description

technical field [0001] The invention relates to a detachable metal sintered wire mesh noise reduction device, which is a noise reduction device installed and applied to flowing gas in a pipeline, and belongs to the field of experimental aerodynamics. Background technique [0002] A high-quality flow field in a wind tunnel requires low noise and low turbulence. The noise reduction methods for the transient high-speed wind tunnel pressure regulating valve mainly include laying multi-layer orifice plates and resonant cavity type plate mufflers. The noise reduction of the multi-layer orifice plate is not obvious, mainly relying on the resonant cavity type chip muffler. The pressure loss of the chip muffler is small, and it has a good noise reduction effect for the middle and high frequency bands around 4000Hz. However, there are problems such as large structural blocking ratio, large space occupation, regenerative noise, weakened noise reduction effect at high speed, and small...

AI Technical Summary

Problems solved by technology

However, there are problems such as large structural blocking ratio, large space occupation, regenerative noise, weakened noise reduction effect at high speed, and small low-frequency noise reduction.

Moreover, the resonant cavity-type chip muffler is installed once, and the noise reduction effect is reduced after long-term use. Later maintenance often requires production shutdown, dismantling and maintenance, which is difficult to maintain. For large-sized wind tunnels, the maintenance cost is huge

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