Pump Technical Knowledge: Methods to Reduce Pump Noise

The noise of the water pump is mainly the aerodynamic noise produced by the gas/liquid during transportation, the structural noise of the motor casing that is excited by the vibration, the noise caused by the vibration of the machine base, and the noise of the motor. Such noise level peaks are mainly concentrated in the low octave band, approximately in the range of 100-450 Hz. The sound source is a steady-state noise when the pump room is operating normally. Pipeline noise refers to the noise generated when water flows in a pipeline. In addition, the cavitation phenomenon of the pump and the phenomenon of stopping the pump water hammer can also produce transient noise. The noise generated by the water supply pipe is affected by the flow rate and pressure.

The noise produced by the pumping room's entire installation is mainly mechanical noise. The methods used to control noise on acoustic principles are more commonly used to control the transmission route of noise, mainly including sound insulation, sound absorption, and noise elimination. Sound insulation is the use of sound insulation structure to separate the sound source from the sound receiving point; sound absorption is to use sound absorption structure or sound-absorbing material to reduce noise; noise reduction is to use the principle of impedance, resistance, porous diffusion, etc. to reduce the noise value.

Noise control measures should be based on acoustic principles and make full use of site environment and conditions. Such as:

1, according to the pump room environment, the sound source is not closed tight pump room noise treatment, the noise of the pump room to take the sound / sound insulation treatment, doors and windows also do sound processing.

2. Control the noise generated by machinery equipment and equipment parts. The new pump room water pump foundation should adopt a large weight to prevent vibration from generating noise. , And should be set up rubber isolation vibration isolation, etc., in order to reduce the vibration noise; each pump unit set a separate base to prevent resonance. Use “soft” couplings as much as possible on the pump suction and pressure pipes. Regular maintenance, such as the occurrence of problems such as root leakage, loose parts of equipment, severe wear of equipment parts, mechanical vibration, etc., should be promptly repaired to reduce noise.

Due to different manufacturers and types of pumps, the working principle and structure will be different. Therefore, on-site survey and analysis of noise sources is very important for the design of the soundproofing and noise reduction scheme of the pump house and the selection of materials.

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