[0034] The following combination Figure 1~2 An embodiment of the present invention will be described in detail.
[0035] The noise reduction device of compressor includes sound insulation cover 1, which is arranged in engine room 4 to wrap the compressor, and is characterized by further including sound attenuation box 2 arranged in engine room 4 to absorb noise and reduce vibration of the wall plate of engine room 4, and sound absorption structure 3 arranged in engine room 4 to absorb reflected sound waves, and sound absorption structure 3 is arranged between sound attenuation box 2 and sound insulation cover 1.
[0036] The noise reduction device of the compressor includes a sound insulation cover 1, a sound attenuation box 2 and a sound absorption structure 3. The sound insulation cover 1 wraps the compressor to prevent the compressor noise from spreading to the cabin cavity, the sound attenuation box 2 absorbs the noise in the cabin 4 space and reduces the vibration of the cabin wall, and the sound absorption structure absorbs the sound waves constantly reflected between the sound insulation cover and the sound attenuation box, thereby reducing the noise in the cabin space, effectively reducing the noise from the cabin and effectively improving the reliability and effectiveness of noise reduction of the compressor.
[0037] Among them, the sound insulation cover 1 includes sound-absorbing layer 1 11, baffle sound 12 and sound-absorbing layer 2 13 from inside to outside, and the sound-absorbing layer 1 11 is in contact with the outer wall of the compressor. The materials of the sound-absorbing layer 1 11 and the sound-absorbing layer 2 13 are fiber materials or porous foamed organic materials with a density of 15-100 kg/m3, and the sound insulation layer 12 is a dense material with a density of 1,000-8,000 kg/m3. The first sound absorption layer 11 faces the compressor, the second sound absorption layer 13 faces the external environment of the compressor, and the sound insulation plate 12 is located between the first and second sound absorption layers. The double-layer structure of sound-absorbing layer 1 11 and sound-absorbing layer 2 13 is used to absorb the noise transmitted from the compressor to the space inside the engine room 4, improve the sound insulation effect of the sound insulation cover, and effectively absorb the noise generated by the pipeline and control system inside the engine room. The density of sound-absorbing layer 1 11 and sound-absorbing layer 2 13 is selected to ensure that the noise can be effectively absorbed when it reaches the sound-absorbing layer, and the sealing of sound insulation board 12 is selected to ensure sound insulation and sound blocking effect.
[0038] The silencing box 2 comprises a damping layer 21, a sound absorption layer 3 22 and a perforated layer 23, wherein the damping layer 21 is attached to the inner wall of the engine room 4, and the sound absorption layer 3 22 is sandwiched between the perforated layer 23 and the perforated layer 21. The damping layer 21 is tightly attached to the wall of the engine room 4, the outermost layer is perforated layer, and the middle layer is sound absorption layer 3. The damping layer can reduce the vibration of the engine room panel by consuming the vibration energy of the engine room panel, thus reducing the noise radiated from the engine room panel.
[0039] Among them, the perforated plate 23 has a cuboid shape with an inner cavity, the sound-absorbing layer 3 22 and the damping plate 21 are laminated in the inner cavity of the perforated plate 23, the damping plate 21 is attached to the inner wall of the engine room 4, and the perforated plate 23 is welded on the inner wall of the engine room 4. The material of the sound-absorbing layer 3 22 is fiber material or porous foamed organic material with a density of 15-100 kg/m3, and the perforated plate 23 is a metal perforated plate with a thickness of no more than 2 mm. The perforated layer 23 is welded and fixed on the cabin wall plate to prevent the muffler box 2 from falling off after long-term use. By adjusting the thickness and perforation rate of the perforated plate 23, the noise reduction frequency band of the muffler box 2 can be expanded and the noise reduction efficiency can be improved.
[0040] The sound-absorbing structure 3 consists of a protective layer 31 and a sound-absorbing layer 432, wherein the sound-absorbing layer 432 is bonded to the sound-insulating layer 1 and/or the sound-absorbing box 2, and the protective layer 31 completely covers the exposed surface of the sound-absorbing layer 432, and the sound-absorbing layer 432 is made of fiber material or porous foamed organic material with a density of 15-100 kg/m. 3. A sound absorption structure is added in the space between the sound insulation cover 1 and the sound attenuation box 2. When the noise inside the engine room is constantly reflected back and forth between the sound insulation cover and the sound attenuation box of the engine room wall plate, the sound energy will be attenuated to a great extent after the noise passes through the sound absorption structure, thus reducing the noise inside the engine room.
[0041] The sound absorption structure 3 is connected with the sound insulation cover 1 and the sound attenuation box 2 which are arranged opposite to each other, and is connected with the two sound attenuation boxes 2 which are arranged opposite to each other, forming an interwoven distribution in the engine room 4. such as Figure 1 As shown, the sound-absorbing structure 3 forms a cross shape in the engine room, which can absorb the sound waves constantly reflected between the sound-insulating cover 1 and the sound-absorbing box 2, and can also absorb the sound waves constantly reflected between the sound-absorbing boxes 2. The sound-absorbing structure 3 has a large sound-absorbing distribution area, can absorb sound waves in all directions and positions, and has high sound-absorbing efficiency.
[0042] The sound-absorbing structure 3 is bonded to the sound-absorbing box 2, and the sound-absorbing layer 4 32 is an irregular surface with a larger area. such as Figure 2 As shown, in order to reduce the space occupation rate of the sound absorption structure 3 in the engine room 4 and avoid its interference with other equipment in the engine room, the sound absorption structure 3 can be bonded only to the sound box 2, and the outer surface of the sound absorption layer 4 32 is designed as an irregular profile with a larger area, so as to absorb more reflected sound waves and improve the sound absorption effect.
[0043] The invention also protects a compressor noise reduction method, which adopts the compressor noise reduction device described above, and is characterized in that the sound insulation cover 1 is designed according to the noise frequency of the compressor in the engine room 4, the noise reduction box 2 is designed according to the noise frequency in the inner cavity of the engine room 4 and the vibration frequency of the wall plate of the engine room 4, and the sound absorption structure 3 is designed according to the noise reduction effects of the sound insulation cover 1 and the noise reduction box 2 after the sound insulation cover 1 and the noise reduction box 2 are determined. The sound insulation cover 1 wraps the compressor to block the transmission of compressor noise to the engine room cavity, the noise box 2 absorbs the noise in the engine room space and reduces the vibration of the engine room bulkhead, and the sound absorption structure 3 absorbs the sound waves constantly reflected between the sound insulation cover and the noise box, thus reducing the noise in the engine room space, effectively reducing the noise transmission from the engine room, and effectively improving the reliability and effectiveness of noise reduction for the compressor.
[0044] Among them, "designing sound insulation cover 1" refers to designing the thickness and density of sound absorption layer 1 11, sound absorption layer 2 13 and sound insulation layer 12, so that the sound insulation cover 1 can absorb the noise generated by the internal pipeline and control system of the engine room; "Designing the silencing box 2 according to the noise frequency in the engine room 4 and the vibration frequency of the engine room 4 wall panel" means designing the thickness and perforation rate of the perforated plate 23 and the thickness and density of the sound-absorbing layer 3 22 according to the noise frequency in the engine room 4, so that the sound-absorbing frequency of the silencing box 2 is compatible with the noise frequency in the engine room 4 wall panel, and designing the thickness and density of the damping plate 21 according to the vibration frequency of the engine room 4 wall panel, so that the vibration energy of the damping plate 21 and the engine room 4 wall panel can be effectively consumed and the vibration of the engine room 4 wall panel can be reduced. According to the noise frequency of the compressor 5, the noise frequency of the space in the engine room 4 and the vibration frequency of the engine room wall plate, the sound insulation cover 1 and the sound attenuation box 2 are designed to improve the noise reduction efficiency.
[0045]Among them, "design the sound absorption structure 3 according to the noise reduction effect of the sound insulation cover 1 and the sound attenuation box 2 after the sound insulation cover 1 and the sound attenuation box 2 are determined" means that after the parameters of the sound insulation cover 1 and the sound attenuation box 2 are determined, the sound insulation cover 1 and the sound attenuation box 2 are first installed in the engine room 4, and then the thickness and density of the sound absorption layer 4 32 and the layout structure of the sound absorption layer 4 32 in the engine room 4 are designed according to the noise frequency in the engine room 4 after the sound insulation cover 1 and the sound attenuation box 2 are installed, so that the sound absorption structure 3 can effectively absorb the engine room. That is, after the noise reduction effect of the sound insulation cover 1 and the noise reduction box 2 is determined, the thickness and density of the sound absorption layer 4 32 and the layout structure of the sound absorption layer 4 32 in the engine room 4 are determined to further improve the noise reduction effect.
[0046] The technical scheme of the embodiments of the present invention is fully described with reference to the drawings above, and it should be noted that the described embodiments are only a part of the embodiments of the present invention. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in the field without creative labor belong to the scope of protection of the present invention.
