Pump noise source analysis:
Water pump room noise is a comprehensive noise source caused by the noise from the pump's operation and motor noise. As motor noise, there are mainly:
Aerodynamic noise, mechanical noise and electromagnetic noise are three parts. When the motor is working, the airflow noise of the cooling air plus the noise of the blades rotating at a high speed of the fan constitute aerodynamic noise.
Mechanical noise includes noise due to structural vibration caused by bearing noise and unbalanced rotors of the rotor due to "flux harmonic forces". Electromagnetic noise is the main way for the pump room noise to be transmitted outwards by the alternating magnetic attraction between the stator and the rotor and the hysteresis expansion and contraction.
Pump noise definition:
Pump noise, also known as pump noise, pump noise, pump noise, is a physical property of noise. The example of water pump noise control in the basement of Shanghai Shimao Riverside Garden managed by Hangzhou Hanks Sound Insulation Technology Engineering Co., Ltd. states: 1. The noise of the pump itself; 2. The resonance of the pipeline due to the operation of the pump; 3. The operating noise of the electrical transformer 4. The movement of the water flow caused by the operation of the water pump, the impact noise of the water flow, comprehensively speaking, it is the irregular, intermittent or random acoustic vibration generated during the operation of the water pump, that is, the noise of the water pump.
Water pump noise control measures:
1 The pump body and the water supply pipe are connected by a soft joint.
2 Where the pipe is in contact with the wall, the elastic support is adopted, and the wall pipe is installed with an elastic cushion.
3 Dig the low cement foundation, the pump base and the base are connected with the ZGT damper steel spring shock absorber (note that: the base is not in direct contact with the foundation, and the pump base is not connected with the shock absorber by welding) .
4 Select shock absorbers. The choice of shock absorbers is as follows:
(1) Determine the total weight of the shock absorber system (including equipment rack or pedestal weight): W = 266 kg;
(2) Equipment interference frequency:: n/60=24.7 Hz;
(3) Select 4 of the same model of zGT3-9, and the load of each damper is W/4=266/4:66.5 kg;
(4) Find the vertical natural frequency fo=2.9 Hz (note: f./fo>42) from the characteristic curve of the shock absorber zGT3-9 and the optimum corresponding deformation amount, and: f/fo:24. 7/2.9=8.
(5) Transmissibility of vibration isolation: 7/=1=0.014
(6) Vibration isolation rate: TA=(1)%=98.6%
(7) From the vibration isolation rate, the selected dampers meet the design requirements.
Pump noise control principle:
The water pump is installed on the vibration damping device. This will greatly reduce the noise in the pump room. This is a misunderstanding. The actual situation is not the case, because the body of the pump is not very big, and the noise emitted by itself will not be too much, and the degree of automatic control of the pump room is getting higher and higher. The time required for the duty officer to stay in the pump room is getting shorter and shorter. Daily short-term inspections or overhauls have no effect on the health of the on-duty personnel. Moreover, the noise level of a qualified pump is generally about 85 dB (according to GB/ TQ38l l984), while the tolerance of noise for hearing protection in China's manual laborers is 70-90 J, but if the pump house and the household are in a building. Its vibration is transmitted through the foundation wall and pipeline to a larger surface, such as the ceiling, wall surface and floor of the squat wall or upper room, and the noise is significantly enhanced due to the improved radiation conditions. The simplest and most effective way to reduce such noise is to install shock absorbers or shockproof materials on the pump base. Inlet pipe installation elastic support. Wall pipe installation elastic cushion. Although this measure does not make much sense in reducing the air noise in the pump room, it is very effective in reducing the noise in the residents' houses. The engineering cost can be controlled within 10,000 yuan, and the engineering cost-effectiveness is very high.
Water pump room noise is a comprehensive noise source caused by the noise from the pump's operation and motor noise. As motor noise, there are mainly:
Aerodynamic noise, mechanical noise and electromagnetic noise are three parts. When the motor is working, the airflow noise of the cooling air plus the noise of the blades rotating at a high speed of the fan constitute aerodynamic noise.
Mechanical noise includes noise due to structural vibration caused by bearing noise and unbalanced rotors of the rotor due to "flux harmonic forces". Electromagnetic noise is the main way for the pump room noise to be transmitted outwards by the alternating magnetic attraction between the stator and the rotor and the hysteresis expansion and contraction.
Pump noise definition:
Pump noise, also known as pump noise, pump noise, pump noise, is a physical property of noise. The example of water pump noise control in the basement of Shanghai Shimao Riverside Garden managed by Hangzhou Hanks Sound Insulation Technology Engineering Co., Ltd. states: 1. The noise of the pump itself; 2. The resonance of the pipeline due to the operation of the pump; 3. The operating noise of the electrical transformer 4. The movement of the water flow caused by the operation of the water pump, the impact noise of the water flow, comprehensively speaking, it is the irregular, intermittent or random acoustic vibration generated during the operation of the water pump, that is, the noise of the water pump.
Water pump noise control measures:
1 The pump body and the water supply pipe are connected by a soft joint.
2 Where the pipe is in contact with the wall, the elastic support is adopted, and the wall pipe is installed with an elastic cushion.
3 Dig the low cement foundation, the pump base and the base are connected with the ZGT damper steel spring shock absorber (note that: the base is not in direct contact with the foundation, and the pump base is not connected with the shock absorber by welding) .
4 Select shock absorbers. The choice of shock absorbers is as follows:
(1) Determine the total weight of the shock absorber system (including equipment rack or pedestal weight): W = 266 kg;
(2) Equipment interference frequency:: n/60=24.7 Hz;
(3) Select 4 of the same model of zGT3-9, and the load of each damper is W/4=266/4:66.5 kg;
(4) Find the vertical natural frequency fo=2.9 Hz (note: f./fo>42) from the characteristic curve of the shock absorber zGT3-9 and the optimum corresponding deformation amount, and: f/fo:24. 7/2.9=8.
(5) Transmissibility of vibration isolation: 7/=1=0.014
(6) Vibration isolation rate: TA=(1)%=98.6%
(7) From the vibration isolation rate, the selected dampers meet the design requirements.
Pump noise control principle:
The water pump is installed on the vibration damping device. This will greatly reduce the noise in the pump room. This is a misunderstanding. The actual situation is not the case, because the body of the pump is not very big, and the noise emitted by itself will not be too much, and the degree of automatic control of the pump room is getting higher and higher. The time required for the duty officer to stay in the pump room is getting shorter and shorter. Daily short-term inspections or overhauls have no effect on the health of the on-duty personnel. Moreover, the noise level of a qualified pump is generally about 85 dB (according to GB/ TQ38l l984), while the tolerance of noise for hearing protection in China's manual laborers is 70-90 J, but if the pump house and the household are in a building. Its vibration is transmitted through the foundation wall and pipeline to a larger surface, such as the ceiling, wall surface and floor of the squat wall or upper room, and the noise is significantly enhanced due to the improved radiation conditions. The simplest and most effective way to reduce such noise is to install shock absorbers or shockproof materials on the pump base. Inlet pipe installation elastic support. Wall pipe installation elastic cushion. Although this measure does not make much sense in reducing the air noise in the pump room, it is very effective in reducing the noise in the residents' houses. The engineering cost can be controlled within 10,000 yuan, and the engineering cost-effectiveness is very high.
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