Acoustic insulation cover, design method for acoustic insulation cover, and acoustic insulation method for compressor

Abstract

The invention discloses an acoustic insulation cover, which comprises a cylindrical side wall and a top cover which is sealed and covered on the top of the side wall, wherein the side wall and the topcover independently comprise an acoustic absorption layer used for absorbing noise, and an acoustic insulation layer used for preventing noise from outwards radiating, and the acoustic absorption layer and the acoustic insulation layer are laminated and spliced from inside to outside. The acoustic insulation cover is characterized in that the acoustic absorption layer is internally at least provided with two acoustic absorption cotton layers; an acoustic absorption cavity is formed between the adjacent acoustic absorption cotton layers; and an acoustic absorption thin film capable of absorbing low and medium frequency noise is arranged in the acoustic absorption cavity. According to the acoustic insulation cover, the low and medium frequency noise can be effectively absorbed, acoustic absorption efficiency for the low and medium frequency noise is improved, noise reduction reliability is improved, convenience for a line to extend out is improved, the practicality of the acoustic insulation cover is improved, the thickness of an air layer in the acoustic absorption layer of the side wall in a use process is guaranteed, and therefore, the acoustic absorption efficiency and the acoustic absorption reliability of the acoustic absorption layer of the side wall are effectively improved. The invention also provides a design method for the acoustic insulation cover, and an acoustic insulation method for a compressor.

Description

technical field [0001] The invention relates to a sound insulation cover, which is used for passive noise reduction of a compressor. The invention 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 noise of the compressor accounts for more than 80% of the noise energy of the air conditioner. The noise of the compressor includes mechanical noise, electromagnetic noise and aerodynamic noise. Radiates noise outwards in the form of vibrations or sound waves. [0003] The current compressor noise control measures mainly include active noise reduction and passive noise reduction. The active noise reduction technology of the compressor mainly refers to the research on improving the structural design of the compressor to reduce noise. Noise and sound insulation Noise reduction refers to the t...

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

Images