Sheet type silencer with adjustable through-flow area

Abstract

The invention discloses a sheet type silencer with an adjustable through-flow area. The sheet type silencer comprises a plurality of silencer units. Each silencer unit comprises a fixed silencer body, a movable silencer body, as well as a rectangular cavity which is surrounded by a back plate and an upper-lower cover plate, wherein the fixed silencer body is fixed inside the cavity; the back plate is provided with a plurality of guide shafts which are perpendicular to the back plate and run through the fixed silencer body; the movable silencer body is provided with guide sleeves matched with the guide shafts; and the movable silencer body can slide along the guide shafts by virtue of the guide sleeves. The sheet type silencer also comprises two rotating shafts which are respectively arranged at the front end and the rear end of the cover plate and are vertical to the guide shafts, two arc-shaped fixed flow guide plates, two arc-shaped movable flow guide plates, and a driver capable of driving the movable silencer body to move along the guide shafts. The through-flow area of the silencer with the structure can be adjusted, i.e., the sheet thickness and the sheet spacing of the silencer are determined according to the annual average temperature, and therefore, a fan with appropriate power can be selected.

Description

Technical field [0001] The invention relates to a ventilation muffler, in particular to a muffler suitable for air intake and exhaust air of a cooling tower of a power plant. Background technique [0002] With the improvement of environmental protection requirements, in order to reduce the impact of high-noise equipment on the surrounding environment, it is generally required to arrange mufflers at the air inlet and outlet of the intake and exhaust fans to prevent noise from overflowing. The control of fan inlet and exhaust noise generally uses a chip muffler, and its sound attenuation (insertion loss) is generally implemented in accordance with GB12348-2008 "Environmental Noise Emission Standard for Industrial Enterprises". According to this standard, there is generally a difference of 10 dB (A) between the control standards during the day and night. In the design, the design is generally based on night standards. There are two main indicators for the performance of the muffle...

AI Technical Summary

Problems solved by technology

[0008] 1. The cross-section of the flow is fixed, so it is difficult to adapt to the different noise limit values ​​during the day and night, as well as the requirements of high temperature and general temperature on the fan

[0009] 2. The fixed muffler can only be configured according to the noise limit value at night and the cooling requirements of the high temperature season. The high-power fan

waste of energy

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