Muffling device and electromechanical device

Abstract

The invention relates to a muffling device and an electromechanical device and belongs to the muffling technical field. According to the main technical schemes of the invention, the muffling device is of a sealed cavity structure; the muffling device includes a first side plate and a second side plate; a plurality of holes are formed in the first side plate and used for enabling beam-shaped acoustic waves to enter a sealed cavity; the first side and the second side plate are oppositely arranged; and the second side plate is set to a sound guiding structure and is used for changing the transmission direction of the beam-shaped acoustic waves entering the sealed cavity so as to enable the beam-shaped acoustic waves to be transmitted divergently in the sealed cavity, so that the acoustic waves can be converted into inner energy gradually under damping effects in divergent transmission directions. The electromechanical device comprises the above muffling device, so that noises generated by the electromechanical device can be removed. According to the muffling device provided by the invention, noises can be removed, and the thickness of the muffling device can be decreased, and the use condition of the muffling device in the limited space of the electromechanical device can be improved.

Description

technical field [0001] The invention relates to the technical field of noise reduction, in particular to a noise reduction device and electromechanical equipment with the noise reduction device. Background technique [0002] The noise emitted by electromechanical equipment will bring noise pollution to people's life and work. [0003] Taking air-conditioning equipment as an example, when the air-conditioning equipment is running, the noise generated by the fan on it escapes into the room, the regenerative noise at the end of the air pipe, and the noise generated when the compressor is working, etc. Here comes the trouble. In order to reduce the noise during the operation of the air-conditioning equipment, sound-absorbing cotton is usually pasted on the partitions in the air-conditioning equipment. However, the existing large-capacity side-outlet multi-line partition is a single-layer sheet metal part, which has no noise-absorbing function. Since multiple welding and hot-fi...

AI Technical Summary

Problems solved by technology

[0006] First, the micropores on the thin plate are easily blocked by flying dust, which affects the sound absorption effect and requires frequent maintenance;

[0007] Second, thin plates are easily deformed, corroded and faded;

[0008] Third, the sound absorption coefficient for low and high-frequency noise sections is low, and the overall sound absorption frequency bandwidth is not large. Although the frequency bandwidth can be increased by using a double-layer micro-hole perforated plate, a thicker cavity is required, from which Structural and economical considerations are inappropriate;

[0009] Fourth, the "air cushion spring" after perforation is too thick, which limits its use in occasions with space requirements

[0010] In addition, CN912088222 discloses a combined high-efficiency muffler, whose structure is composed of a sound reflection cone and surrounding sound-absorbing materials. Although this kind of muffler can effectively absorb vertical noise, the inventors of the present invention found that due to its structure and sound-absorbing The limitation of the principle makes it have the following disadvantages: first, it cannot be made thin; second, it cannot be used in wide-plane sound-absorbing occasions; third, its internal sound-absorbing material limits its work in high-temperature, humid and dusty environments

[0011] In summary, due to the above defects in the above-mentioned existing muffler, its application on electromechanical equipment is limited

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