Medium and low frequency silencer for Roots fan

Abstract

The invention provides a medium and low frequency silencer for a Roots fan, and belongs to the technical field of silencers. The medium and low frequency silencer is a silencer used for handling medium and low frequency noise and solving the problems that produced silencers existing on the market are small in size, short in effective noise elimination section, small in noise elimination amount andpoor in medium and low frequency noise elimination effect. The medium and low frequency silencer for the Roots fan comprises a silencer shell, and further comprises a perforated steel plate and a sound absorbing sheet. The gap between the perforated steel plate and the silencer shell is sequentially filled with low-unit-weight centrifugal glass wool, medium-unit-weight centrifugal glass wool andhigh-unit-weight centrifugal glass wool from outside to inside. The sound absorbing sheet is inserted into a central hole of the perforated steel plate. The sound absorbing sheet comprises low-unit-weight sound absorbing cotton, high-unit-weight sound absorbing cotton and medium-unit-weight sound absorbing cotton, wherein the low-unit-weight sound absorbing cotton, the high-unit-weight sound absorbing cotton and the medium-unit-weight sound absorbing cotton are sequentially arranged. A combined structure is adopted, a sound absorbing cavity is designed behind, and the low frequency sound absorbing effect is improved. Meanwhile, relatively low unit weight glass wool is selected in combination with medium and high frequency noise, so that medium and low frequency noise is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of mufflers, and relates to a muffler for treating middle and low frequency noise, in particular to a middle and low frequency muffler for Roots blower. Background technique [0002] In recent years, the number of employees with abnormal hearing found in occupational health examinations has increased year by year. Occupational noise deafness occurs frequently, and the noise of rotating equipment such as Roots fans exceeds the standard, which seriously affects people's physical and mental health and needs to be dealt with promptly. [0003] Due to the wide range of uses of the Roots blower, the low-frequency noise at the intake and exhaust ports is large, generally between 100-110dB(A), and the transmission distance is long, which has a great impact on environmental noise. The mufflers currently on the market are small in size, short in effective muffler section, small in muffler capacity, and poor in muffler...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of small volume, short effective muffler section, small muffler volume, and poor muffler effect at middle and low frequencies of the mufflers currently produced on the market, the present invention provides a muffler for treating middle and low frequency noise, which can also be said to be A Medium and Low Frequency Muffler for Roots Blower

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