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Analysis of pump noise source
Pump noise source analysis: Pump room noise is noise caused by the pump and motor noise caused by a comprehensive noise source. As the motor noise, there are three parts: aerodynamic noise, mechanical noise and electromagnetic noise. When the motor is working, the airflow noise of the cooling air plus the blade noise of the fan rotating at high speed constitutes the aerodynamic noise. Mechanical noise includes bearing noise and unbalanced rotor of the motor resulting from structural vibrations caused by "trench harmonic force" and other effects. Electromagnetic noise is caused by the alternating electromagnetic attraction between the stator and the rotor. The main way to transmit the pump noise caused by the hysteresis expansion is air transmission and solid sound transmission. The definition of pump noise: pump noise, also known as pump noise, pump vibration, pump noise, is a physical noise. There are the following: 1, the noise of the pump itself; 2, because of the pump operation, causing the pipeline resonance; 3, the operating noise of the electrical transformer; 4, the pump running water movement, water impact noise. Generally speaking, it is an irregular, intermittent or random acoustic vibration generated by the pump during operation, that is, pump noise. Pump noise control measures: â‘ pump body and water supply pipe with a soft connector. â‘¡ pipe and wall contact with the use of flexible support, wall pipe installation of elastic cushion. â‘¢ digging low cement foundation, the pump base and the foundation using ZGT damping steel spring shock absorber connection (to be noted that: to ensure that the base and the base is not in direct contact with the pump base and the shock absorber connection not to use the welding connection) . â‘£ Choose shock absorber. The choice of shock absorber is as follows: (1) Determine the total weight of the shock absorber system (including the weight of the equipment rack or pedestal): W = 266 kg; (2) Equipment interference frequency: n / 60 = 24.7 Hz; The trial use of four models with the same type of zGT3-9, each shock absorber load W / 4 = 266/4: 66.5 kg; (4) by the shock absorber zGT3-9 characteristic curve and the best corresponding deformation, Find the vertical natural frequency fo = 2.9 Hz (Note: f./fo> 42) ,: f /fo:24.7/2.9=8. (5) Vibration isolation transmissibility: 7 / = 1 = 0.014 Rate of vibration: TA = (1 -)% = 98.6% (7) Seen from the rate of vibration isolation, the selected vibration damper meets the design requirements. Pump noise control principle: the pump installed in the damping device, will greatly reduce the noise inside the pump room, which is a misunderstanding. The actual situation is not the case, because the body size of the pump æ‚» small, radiation itself will not be too much noise, and today's pump control automation is getting higher and higher.