Sound insulation cover, design method of sound insulation cover, and sound insulation method of compressor

Abstract

The sound insulation cover includes a cylindrical side wall and a top cover sealed on the top of the side wall. Both the side wall and the top cover include a sound absorption layer for absorbing noise and a sound insulation layer for blocking noise from radiating outward, The sound-absorbing layer and the sound-insulating layer are laminated and bonded from the inside to the outside, and it is characterized in that the sound-absorbing layer has at least two layers of sound-absorbing cotton layers, and a sound-absorbing cavity is formed between adjacent sound-absorbing cotton layers. A sound-absorbing film that can absorb medium and low frequency noise is arranged in the sound-absorbing cavity. The invention can effectively absorb the medium and low frequency noise, improve the sound absorption efficiency of the medium and low frequency noise, improve the reliability of noise reduction, improve the convenience of line extension, improve the practicability of the sound insulation cover, and ensure the side enclosure suction during use. The thickness of the air layer in the sound layer can effectively improve the sound absorption efficiency and sound absorption reliability of the side surround sound absorption layer. The invention also provides a design method of a sound insulation cover and a sound insulation method of a compressor.

Description

technical field [0001] The invention relates to a sound insulation cover, which is used for passive noise reduction of a compressor, and also relates to a design method of the sound insulation cover and a sound insulation method of a compressor. Background technique [0002] The compressor is the main noise source of the air-conditioning unit. Under most working conditions, the compressor noise accounts for more than 80% of the noise energy of the air conditioner. The compressor noise includes mechanical noise, electromagnetic noise and aerodynamic noise. The noise is radiated outward in the form of vibration or sound waves. [0003] The current compressor noise control measures mainly include active noise reduction and passive noise reduction. The compressor active noise reduction technology mainly refers to the research on improving the structure design of the compressor to reduce noise. The compressor passive noise reduction technology mainly includes the sound absorption...

AI Technical Summary

Problems solved by technology

After literature search, it was found that in the passive noise reduction technology of compressors, the sound insulation cover composed of absorption and sound insulation materials is mainly used to block the external radiation of compressor noise, but there are the following problems: 1) The sound absorption layer generally adopts 20mm The sound-absorbing material within 500Hz has poor sound-absorbing effect at low and medium frequencies, resulting in limited low-frequency noise reduction capability of the sound insulation enclosure; 2) When the pipeline and wiring of the compressor pass through the sound insulation enclosure, the sound insulation enclosure There are many gaps between the hole structure involved and the compressor pipeline and wiring, resulting in the leakage of compressor noise from the gaps; 3) The sound insulation cover includes two parts: the top cover and the side wall, and the contact part between the two is insufficient due to insufficient sealing Leakage causing compressor noise

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