Central air conditioning noise control

2018.01.26 11:56 802次
Central air conditioning noise control

       The noise sources of the air conditioning room include the noise emitted during the operation of the unit, the noise generated by the operation of the fan, and the noise generated by the re-radiation of the mechanical vibration through the ground。降噪The most fundamental way is to start from the sound source, from the point of view of reducing noise pollution to the surrounding environment, and adopt some conventional noise reduction technologies, such as sound insulation,Sound absorption, vibration isolation and other methods。This project does not involve the noise reduction processing of the unit equipment itself, so the construction process only focuses on the sound absorption insulation of the inner wall of the machine roomSound processing。 The project mainly consists of seven steps: wall leveling, asphalt moisture-proof, keel installation, sound-absorbing glass wool paving, glass cloth paving, faceInstallation of layer aluminum plate mesh, installation of aluminum alloy laminate。


First, the wall leveling


       The purpose of wall leveling is to facilitate the construction of moisture barrier and sound insulation layer, and to enhance the sound insulation effect of the wall。The wall screed is made of 1:3 cement mortar with thick plastering度1.5-2cm。When the plastered wall is completely dry, remove the cement mortar residue that is easy to fall off the wall。 The flatness error range of the wall after leveling is controlled at 10mmWithin, that is, the difference between the most convex point and the most concave point should not exceed 10mm。 


Second, asphalt moisture-proof  


        Asphalt moisture-proof on the wall can keep the wall dry and prevent condensation from affecting the sound-absorbing properties of the sound-absorbing materials。Moisture-proof asphalt is generally used 10 or 30Petroleum asphalt is made by adding a specific solvent, construction after the screed layer is dry, the construction method can be sprayed or painted, and it is required to be thin and uniform, without blank, blank, or blank.麻点Or bubble。The asphalt moisture-proof layer must be fully dried after brushing, and the coating thickness of the asphalt moisture-proof layer should be controlled within 2mm, and the construction wall should be 100%被沥Green cover, asphalt layer drying degree to non-stick hand as standard。 


Third, the installation of keel  


        The keel is used to fix the sound-absorbing material, and the material is light steel keel。The light steel keel is fixed on the wall by expansion bolts and installed longitudinally. The spacing of the expansion bolts is not less than80cm, light steel keel installation spacing is not less than 60cm。The load-bearing strength of the light steel keel after installation is not less than 100kg。Flatness of light steel keel after installationThe error is controlled within 5mm, that is, the difference between the highest point and the lowest point cannot exceed 5mm。


Four, acoustic glass wool paving 


       After the light steel keel is installed, the sound absorbing glass wool is cut into a plate with the same width as the installation distance of the light steel keel, and the two sound absorbing glass are embedded between the light steel keelThe seams between the glass cotton plates should be packed tightly。 


Five, glass cloth pavement  


       The main function of the glass fiber cloth is to prevent the leakage of the sound absorbing glass wool fiber, and the auxiliary function is to smooth and fix the sound absorbing glass wool。The number of glass cloth used should not be less than12目。During construction, the glass fiber cloth is stretched flat and tight on the surface of the sound-absorbing glass wool, so that the glass fiber bundle is warp and weft。There is no folding phenomenon on the surface of the glass fiber clothFlatness error 5mm。


Installation of surface layer aluminum plate mesh 


       The surface layer aluminum plate net adopts fishscale pattern punching aluminum plate net, the mesh density is 5×10, and the thickness of aluminum plate is 0.7mm。The main function of the surface layer aluminum plate net is to fix the sound absorbing glassCotton and glass cloth, auxiliary role is to decorate the sound-absorbing wall。The aluminum plate mesh is laid on the surface of sound-absorbing glass wool and glass fiber cloth, and the joints are covered by aluminum alloy laminate盖。When the aluminum plate mesh is installed, the fish scale faces outward, and the opening hole is downward to prevent dust from falling into the sound-absorbing material。The flatness error of the aluminum plate mesh is controlled at 5mm。


Seven, the installation of aluminum alloy laminate


       The aluminum alloy strip is 38mm wide, with two reinforcing bars on the inside, and the surface is coated with imitation red copper titanium alloy。Its main function is to match the light steel keelA sound-absorbing wall plays a fixed role, and the auxiliary role is to play a certain decorative role on the wall。The aluminum alloy laminate is installed in vertical and horizontal shape, and the longitudinal spacing is600mm, the horizontal spacing is 1200mm, fixed on the light steel keel with rivets, the density of rivets is not less than 6 /m2。Aluminum alloy laminate installation levelThe difference is not more than 3mm, the longitudinal error is not more than 3mm, and the flatness error is not more than 5mm。

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