Resonance (mainly vertical pump)
Reason one, fixed pump parts (including the pump shell, the base, etc.) the natural frequency of the resonance phenomenon and speed. A, inspection method, the conditions, characteristics: 1, blow method determination of natural frequency, natural frequency in accordance with rotational speed; 2, only motor, pump side also produce vibration; 3, the motor running, only for a moment, after the cut off power supply when parking the vibration sharply reduced; 4, in most cases, the foundation bolts or motor mounting bolts slightly loose, amplitude was decreased greatly. B, measures: 1, strengthen or weaken the motor pedestal, change the natural frequency of the pump fixed part; 2, to take when no foundation reinforcement; 3, between the pump and foundation to join the antivibration rubber pads, change natural frequency; 4, increase the number of foundation bolts and motor mounting bolts, etc, to improve natural frequency; 5, for small pump, add weight to near the motor.
Reason two, motor check rail and ladder of resonance. A, check method, the conditions, characteristics: 1, remove the railing and the ladder, and vibration can stop; 2, the research set the direction of the ladder, from size to check the vibration direction; 3, inserted into the wood in the middle of the rail, don't move the rail vibration to stop. B, measures: 1, rail and motor pedestal directly inserted into the vibration absorbing rubber; 2, the ladder is not in contact with the pump, using independent ladder.
Reasons three, the speed is close to the critical speed of the rotor. A, check method, the conditions, characteristics such as: water bearing local severe wear (typically have full consideration when the design, so almost won't appear). B, measures: 1, to replace the water bearing; 2, bold axis; 3, improve the rotor balance (speed near the critical speed of the rotor effect is small). |