Silencing sheet

A technology of sound-absorbing sheets and sound-absorbing materials, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of lack of mufflers, etc., and achieve the effects of reducing flow loss, low flow resistance, and benefiting low-frequency sound absorption
CN111489727APending Publication Date: 2020-08-04HUADIAN HEAVY IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUADIAN HEAVY IND CO LTD
Publication Date
2020-08-04

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Abstract

The invention relates to the technical field of silencing sheets, in particular to a silencing sheet which comprises a noise elimination sheet shell which is at least partially composed of a perforated plate; and a sound absorption material which is uniformly filled in the silencing sheet shell; a front edge plate, a middle face plate and a gradually-shrinking face plate are sequentially arrangedon the silencing piece shell in the airflow direction S. The middle face plate and the gradually-shrinking face plate are each composed of two kinds of perforated plates with different perforation rates. According to the silencing sheet provided by the invention, different perforation rates are adopted for the middle panel part and the tapered panel part, so that silencing can be carried out on different frequency spectrum parts of a noise source, and the optimal overall silencing amount under the same pressure loss condition is achieved.
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Description

technical field

[0001] The invention relates to the technical field of sound-absorbing sheets, in particular to a sound-absorbing sheet. Background technique

[0002] The muffler can block and weaken the propagation of sound waves, allowing airflow to pass through, and is an effective tool for noise control. Resistive mufflers are widely used in air-conditioning and ventilation systems of civil and industrial buildings to prevent the outward radiation of operating noise from air-conditioning units, fans, cooling towers, boilers and generator sets. The sound attenuation performance of the resistive sound absorbing sheet mainly depends on factors such as the length, thickness, spacing, shape of the sound attenuating channel, the characteristics of the perforated plate, and the properties of the sound absorbing material.

[0003] By reducing the distance between the plates or increasing the thickness of the sound-absorbing plates, the sound-absorbing capacity can be increased,...

Claims

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