Gas silencing and guiding device for mining local ventilator

Abstract

The invention discloses a gas silencing and guiding device for a mining local ventilator. The gas silencing and guiding device comprises multiple stages of flow guide silencing cones, a positioning support assembly, a protective cover and a connecting flange, and the multiple stages of flow guide silencing cones are laminated up and down and distributed at intervals; the flow guide cone opening ofeach stage of flow guide silencing cone is gradually increased, and the diameter of each flow guide cylinder is matched with the aperture of the corresponding flow guide cone opening and is also gradually increased; sound insulation felts are paved on the inner surfaces and the outer surfaces of the flow guide cones and the flow guide cylinders; the positioning support assembly comprises a plurality of supporting rods and connecting rings, the supporting rods are arranged between supporting tables of the flow guide silencing cones, and the connecting rings are connected with the upper end surface of the connecting flange; the protective cover is of a cylindrical structure with an opening in the lower end, a plurality of ventilation holes are evenly formed in the protective cover, and theprotective cover covers the multiple stages of flow guide silencing cones; and the lower end of the connecting flange is connected with an air inlet of a ventilator. According to the device, gas can enter the device along the axial direction and the annular air inlet, the airflow noise is reduced from the air inlet source, and the airflow noise is reduced to the maximum extent while the ventilation efficiency is ensured.

Description

technical field [0001] The invention relates to the technical field of ventilation and noise reduction in coal mines, in particular to a gas noise elimination and guiding device for a local mining fan. Background technique [0002] At present, most of the fans used in the local ventilation of coal mines are counter-rotating explosion-proof axial flow fans, which generate high noise during operation. Generally, the noise sound pressure level at one meter away from the fan is as high as 95 to 115 decibels on average, which is 10 to 30 decibels higher than the national "Industrial Enterprise Noise Hygienic Standards", and the noise exceeds the standard. At present, some fan manufacturers have installed mufflers at the inlet and outlet of the fan, but the noise reduction of the mufflers is below 10 decibels, but the noise reduction effect is very poor. [0003] At the same time, the fan inlet adopts a conical collector, which has a large flow loss, and the flow state of the gui...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the fans used in the local ventilation of coal mines are counter-rotating explosion-proof axial flow fans, which generate high noise during operation. Generally, the noise sound pressure level at one meter away from the fan is as high as 95 to 115 decibels on average, which is 10 to 30 decibels higher than the national "Industrial Enterprise Noise Sanitation Standard" and the noise exceeds the standard.

At present, some fan manufacturers have installed mufflers at the inlet and outlet of the fans, but the noise reduction of the mufflers is below 10 decibels, but the noise reduction effect is very poor.

[0003] At the same time, the fan inlet adopts a conical collector, which has a large flow loss, and the flow state of the guided gas into the impeller is not good. The air flow enters the flow channel along the direction of the diversion cap or the muffler axially, and the noise of the fan on the air inlet is not fully considered. control; resulting in higher air flow noise

Traditional diversion caps or mufflers have defects in structural combination and installation methods, such as heavy weight, inconvenient processing and installation, etc.

[0004] In addition, due to the narrow working space in the mine, the noise is not easy to attenuate, and the noise generated by the fan will cause serious noise pollution to the working environment, and the noise will endanger the physical and mental health of the staff; Personnel working in a noisy environment cannot carry out verbal communication and cannot timely determine and respond to changes in the surrounding working environment, and due to noise interference, people's energy will be distracted in the noisy environment and work efficiency will be reduced. Unsafe accidents are very easy to occur in the environment, and personal injury accidents caused by the influence of local fan noise are not uncommon; therefore, there is an urgent need for a method that can reduce the noise of local fans to meet the national standards in terms of labor protection and production safety. High-efficiency muffler device for "Industrial Enterprise Noise Hygienic Standard"

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