Analysis of noise sources in the pump room:
1. The noise of the pump room is mainly composed of refrigeration units, motors, fans, etc., and the noise is mainly medium and low frequency noise, which is characterized by strong diffraction ability, strong transmission ability, and difficult sound absorption, which is a thorny problem in noise control, and the sound energy density in the machine room is too large, which aggravates the pollution degree of transmitted noise.
2. The key problem of noise control in the pump room is the noise of the pump, which is a kind of mechanical noise and fluid noise, which is mainly transmitted through the foundation, soft connection and vibration reduction are the key points of treatment, and the design of the vibration reduction system is the top priority. The second key problem is indoor sound energy, too high sound energy will increase the transmitted sound energy, structural sound absorption is a more effective way to absorb sound in the pump room.
3. The noise of the pump room is relatively complex, mainly composed of aerodynamic noise, mechanical noise, pipeline vibration noise, etc., and its noise has the characteristics of frequency bandwidth, low frequency sound intensity, long propagation distance and slow attenuation. These noises affect the lives of upstairs owners in different ways. The noise and vibration generated during the operation of the pump are propagated through the base to the walls and floors, and then from the walls and floors to the top and around.
Noise propagation route of water pump room:
1. Space communication: It is basically the method of building sound insulation facilities adopted by the landlord company, but according to the description of the landlord, it should not be this problem.
2. Pipeline propagation: In addition to the method of adding pipeline rubber joints that the owner company has taken, the perimeter should also be hollowed out at the wall penetration position of the outlet pump room of the outlet pipeline, and vibration reduction measures such as rubber pads and asbestos should be installed to prevent noise and vibration from spreading through the steel structure.
3. Resonance propagation: the source of noise should be solved, or the interference of the resonance frequency of the surrounding structure should be changed (hollowing out, replacing a certain part of the building materials, etc.).
Solutions for low-frequency noise control in the pump room:
1. In order to control the noise, the water pump is equipped with a soundproof cover, and an exhaust fan is added in the cover as a forced ventilation, and a muffler is installed at the same time. For sound insulation, a special sound insulation box is installed that integrates sound absorption and sound insulation. The soundproof box has the characteristics of detachable, easy assembly, and high sound insulation. Considering the large amount of heat dissipation of the water pump, the circulating exhaust method is adopted in the sound insulation box.
2. The pump body and the water supply pipe are connected by soft joints; The place where the pipe is in contact with the wall is elastic support, and the elastic cushion is installed through the wall pipe.
3. Dig a low cement foundation, and use a damping steel spring shock absorber to connect the pump base and the foundation (it should be noted that there is no direct contact between the base and the foundation, and the pump base and the shock absorber should not be connected by welding).
4. In order to isolate vibration and solid sound propagation, and improve the vibration isolation efficiency, the pump foundation is re-isolated. For vibration isolation, a new type of self-developed vibration isolator - metal wire rope vibration isolator is applied. The vibration isolator is a new type of vibration damping, vibration isolation and anti-impact element developed and produced in accordance with national military standards, which is very suitable for vibration isolation of water pumps.