A comprehensive noise reduction and noise reduction structure for ventilation ducts

Abstract

The invention discloses a comprehensive noise reduction and noise reduction structure for a ventilation duct, comprising: a composite sound insulation and sound absorption component, which is wrapped on the outer wall of the duct to reduce the vibration of the duct and absorb high-frequency noise; The plate surface of the orifice plate is perpendicular to the flow direction of the gas in the pipeline; the diameter of the expansion muffler section is larger than the diameter of the pipeline, and the two ends of the expansion muffler section are respectively connected with the pipeline, and the sound waves are reflected in the expansion muffler section to attenuate the noise; the elbow guide The flow sheet is arranged at the elbow of the pipeline, and the guide plate of the elbow matches the bending degree of the elbow of the pipeline, so as to equalize and stabilize the gas flow in the pipeline; the invention overcomes the incomplete noise reduction of the existing pipeline. , The transformation process is complicated and the cost is high. Through the combination of flow field optimization and anti-sound noise reduction, the problem of poor control effect of low-frequency noise generated by pipeline fluid flow is solved, which effectively reduces the ventilation resistance of fan pipelines, saves energy consumption, and eliminates The pipeline has low and medium frequency noise, improving the overall sound insulation performance.

Description

technical field [0001] The invention relates to the technical field of pipeline noise reduction, in particular to a comprehensive noise reduction and noise reduction structure for ventilation pipelines. Background technique [0002] In addition to part of the noise generated by the fans of smelters, oil refineries, coal-fired power plants, heat exchange systems, air conditioning systems and other ventilation systems being transmitted to the surrounding space through the fans and pipe walls, most of the noise is transmitted along the pipeline system. Radiated to the outside space through the duct air inlet. At the same time, the secondary noise generated by the airflow in the duct system is also radiated to the surrounding space through the above two ways; these two parts of the noise will have a greater adverse impact on the surrounding environment and the work and life of personnel. [0003] The patent document with the application number of 2015105123784 discloses a pipel...

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Problems solved by technology

[0004] Technical purpose: Aiming at the shortcomings of the existing pipeline noise reduction system, which are difficult to implement, high in cost, and unable to effectively eliminate low-frequency noise, the invention discloses a structure that is easy to install and implement, low in cost, and can eliminate medium and low-frequency noise in pipelines and Comprehensive noise reduction and noise reduction structure of ventilation pipes to reduce pipeline vibration

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