The noise of the pump room is mainly composed of refrigeration unit, motor, fan and so on. Its noise is mainly medium and low frequency noise. The characteristics of middle and low frequency noise are strong diffraction ability, strong transmission ability and difficult sound absorption. It is the most difficult problem in noise control. The noise in the machine room is too large, thus aggravating the pollution of transmission noise. Degree. The key problem in the noise control of 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. The soft connection and vibration damping are the key points of the control, and the design of the vibration damping system is the most important. The second key problem is indoor acoustic energy. Excessive sound energy will increase the sound energy of transmission. Structural sound absorption is an effective way of sound absorption in pump room.          

The transmission way of noise in pump room is that the noise generated by water pump has two modes of outward propagation, that is, air borne sound and solid sound transmission.  

The sound source directly excite air vibration and transmit noise through air medium to air sound transmission. The vibration of the pump can be transmitted to the building structure by the foundation of the pump, the branch of the pipe and the pipe and the hanger and so on. The vibration of the wall in the room, the Liang Zhu, the doors and windows and the indoor objects in the room can be caused by the building structure. The vibration of these objects will radiate noise again. This noise is a structural noise and is transmitted through solid.    

Generally speaking, the solid sound transmission of water pumps has the following ways:  

1.solid sound transmission is carried out through foundation, floor, wall, floor and other structural parts, and transmitted to each room above the pump house.            

2.water pump pipes propagate solid sound through walls and floors through walls and floors.            

3.the water pump pipe spreads solid sound to the ground through solid steel pipes and hangers on the floor, floor and wall.            

4.the noise generated by the pressure pulsation of the pump is transmitted through the pipe and radiated.            

Water pump noise treatment measures  

The difficulty of water pump noise control engineering lies in isolating and controlling vibration. In implementing such projects, active vibration isolation and sound insulation technology are adopted.            

1)in order to isolate vibration and solid sound propagation and improve isolation efficiency, the foundation of the pump is renewed for vibration isolation. Aiming at vibration isolation, a new type of isolator, metal wire rope isolator, has been developed. The isolator is a new type of vibration isolation, vibration isolation and impact resistant element developed and manufactured according to the national military standards. It is very suitable for vibration isolation of water pumps.            

2) in order to control the noise, the water pump plus the noise insulation cover, the hood and the exhaust fan are used as the forced ventilation, and the intake and exhaust mufflers are installed at the same time. Aiming at sound insulation, a special sound insulation box with sound absorption and isolation is installed. The sound insulation box has the characteristics of detachable, easy assembly and sound insulation. Considering the large heat dissipation of the pump, the circulating exhaust method is adopted in the sound insulation box.