Low-resistance rainproof noise reduction device for air inlet

Abstract

The invention provides a low-resistance rainproof noise reduction device for an air inlet. The device comprises an outer frame, a first sound absorption and insulation sheet, a second sound absorptionand insulation sheet and third sound absorption and insulation sheets, wherein the first sound absorption and insulation sheet is detachably fixed on the inner upper part of the outer frame through fixing assemblies; the second sound absorption and insulation sheet is fixed on the inner bottom of the outer frame; the third sound absorption and insulation sheets are detachably fixed in the outer frame through fixing assemblies and uniformly arranged between the first sound absorption and insulation sheet and the second sound absorption and insulation sheet in a gap mode; and the first sound absorption and insulation sheet and the third sound absorption and insulation sheets are designed to be in an arc shape. According to the low-resistance rainproof noise reduction device for the air inlet, the sound absorption and insulation sheets of the device are arch, so that the size is reduced; a rainproof shutter is not needed, a windward surface is a metal non-perforated protective panel, sothat rain and snow are prevented from entering; a noise facing surface is a metal perforated protective panel to absorb and consume sound energy; flow guide circular arcs are arranged at the abrupt change positions of airflow, so that local pressure loss is reduced; the sound absorption and insulation sheets adopt the fixing assemblies convenient to disassemble, thereby being convenient to disassemble, clean and replace; and under the condition that the noise reduction amount is determined, the size can be effectively reduced, so that the pressure loss is reduced, and the disassembly and the assembly are facilitated.

Description

technical field [0001] The invention relates to the technical field of noise reduction, in particular to a low-resistance rainproof and noise reduction device for an air inlet. Background technique [0002] At present, in order to achieve the purpose of noise reduction in factories, control rooms and other rooms that require ventilation and heat dissipation, ventilation mufflers are generally installed at the ventilation openings, and rain-proof louvers are generally installed on the outer surface of the muffler for façades that require rain protection. Effectively reduce noise radiation and rain and snow drifting in. [0003] But in many cases, due to limited space and other requirements, such as installing a muffler at the air inlet of the factory building wall, considering the aesthetics of the factory building, the facade needs to be flat, no protrusions are allowed, and the internal space is limited, the effective length of the muffler is shortened. At the same time, in...

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Problems solved by technology

[0005] The present invention aims to solve the problems that the noise reduction device increases pressure loss due to preventing rain and snow from drifting in, the effect of noise reduction and ventilation becomes poor, and the problem that it is large in size and difficult to disassemble and replace is designed. The sound-absorbing and insulating sheet adopts a bow shape to reduce the volume; no rain-proof louvers are required, and the windward side is a metal non-perforated protective panel to prevent rain and snow from entering; the noise-facing side is a metal perforated protective panel to absorb and consume sound energy, and the windward side is an absorbent The back panel of the sound insulation sheet is not perforated, which blocks the transmission of direct sound and improves the noise reduction; diversion arcs are set at the abrupt changes in the airflow, and there is no rain-proof louver to reduce local pressure loss. The windward side is a non-perforated protective panel, Reduce frictional pressure loss; the sound-absorbing and insulating sheet adopts a fixed component that is easy to disassemble, which is convenient for disassembly, cleaning and replacement

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