This has been confirmed by our daily operation, which can last a bit longer and burn the rubber bearings.
(3) Vibration caused by overload. Thrust washer pump using tin-base Babbitt alloy, which allows the load of 18MPa (180kgf / cm2). Pump body at start-up, the lubrication of the thrust pad at the border of lubrication. In the pump outlet were installed electric butterfly valve and manual gate valve. When the pump starts to open the electric butterfly valve at the same time, the valve plate can not be opened due to deposition of silt or the manual valve is closed due to human factors, the exhaust gas is not timely and so on, which will cause severe vibration of the pump body and quickly burn the thrust pad, #, 17 # pump that is the case.
(4) outlet turbulence vibration. Dg500 short tube, check valve, electric butterfly valve, manual valve, supervisor and water hammer eliminator are arranged at the outlet of the pump. The turbulent motion of the water produces irregular pulsation phenomena. With the blocking of each valve, the local resistance is larger, Caused by changes in momentum and pressure changes, the role of the tube wall and the pump to make it vibrate, which can observe the value of the pressure gauge pulsation to illustrate. The fluctuating pressure and velocity fields in the turbulent flow are continuously transmitted to the pump body energy. When the main frequency of turbulence is similar to the natural frequency of the deep well pump system, the system absorbs energy and causes vibration. To reduce the impact of this vibration, the valve should be fully open, short tube should be the appropriate length and add bearings. According to this treatment, the vibration value is significantly reduced.
(5) Deep well pump torsional vibration. Long axis deep well pump and motor coupling flexible coupling, shaft length 24.94m. During pump operation, there is a superposition of the main vibrations at different angular frequencies. The results of the two simple harmonic vibrations with different angular frequencies are not necessarily harmonic harmonic vibrations, that is, the two-degree-of-freedom torsional vibration exists inside the pump body, which is inevitable. This vibration mainly affects and impairs the thrust pad. Therefore, to ensure that each plane has a corresponding thrust pad thrust oil wedge case, we will be the original equipment specification random 68 # oil into a 100 # oil to improve the viscosity of the thrust pad oil, so that the thrust pad oil Dynamic pressure lubrication film formation and maintenance is not destroyed.
(6) The vibrations caused by the pumps mounted on the same beam interact with each other. Deep well pumps and motors are installed on two reinforced concrete frame beams with a cross-section of 1450 mm x 410 mm. Each pump and motor have a mass concentration of 18t. The operation of two adjacent pumps oscillating on the same frame beam is again A two-degree-of-freedom vibration system, when one of the motor vibration seriously exceeded without load test run, that is, the elastic coupling is not connected and idling the motor, the other normal operating pump motor amplitude rose to 0.15mm About this situation is not easy to be aware of, should attract attention.
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