Bearing the cause and the accident damage

Bearing damage symbol in 2020 - the cause and the accident 07 - 13 to 1. Reason: bearing damage reasons from several aspects to discuss, from the thrust bearing damage and support bearing damaged two cases discussed below. （ 1) , and often is, if only is the burning of the thrust bearing and axial displacement accidents linked together. When a positive or negative thrust exceeds thrust tile bearing capacity, or thrust tile oil film, thrust tile burning accident will be. The cause of thrust tile burning generally have the following several aspects. 一个。 The steam turbine water hammer or improper handling steam temperature decreases. b。 Steam quality bad, blade fouling. c。 Unit sudden load rejection or intermediate pressure cylinder valve instantaneously by accident. d。 Impurities are oil system to make the thrust tile oil film. （ 2) Support bearing damage reasons of lube oil pressure is reduced, oil bearing fault, individual situation also has the current breakdown of oil film, oily bad or the oil temperature is too high, the oil film. In addition to the above methods to discuss the cause of the bearing damage, can also be from the following several aspects to discuss. 1) The main reason for bearing fault oil bearing fault caused by oil has the following points. 一个。 In the operation of the steam turbine, in time to switch from the oil system, wrong operation. b。 Unit after constant speed, the stop the high pressure oil pump, did not pay attention to monitor the oil pressure. When there has been a shot oiler work properly, the main oil pump outlet non-return door card, and so on and so forth, are still blind to stop the high pressure oil pump, main oil pump and lubricating oil pump and pressure loss, caused by oil. c。 Oil system of accumulated a large number of failed to rule out the air, often can cause instantaneous fault bearing or bearing, bearing burn out. d。 In the process of start-up, stop lubricating oil pump work properly. e. Oil tank oil level is too low, the air leakage incident, the main oil pump oil. f。 Auxiliary power interruption, dc oil pump can't timely inputs, the four oil cut-off. g。 Oil supply pipeline rupture, a large number of oil spill bearing shell oil supply disruptions. h。 When installation or maintenance reserved oil system of cotton cloth and other sundry, feed system caused by congestion. 我。 Bearing in operation of shift, such as bearing rotation, causing oil hole plug. j。 Due to reasons such as system oil, lubricating oil system hydraulic serious decline, low oil pressure protection failed to investment. 2) System with strong vibrations occurring strong vibration will make bearing sharply flood damage, and may also make bearing displacement in running. Unit strong vibration will cause damage of bearing bush or work properly. （ 3) Bearing manufacturing bad bearing manufacturing bad main show is sharply pouring quality bad, therefore occurs in the operation of the axle bush has sharply changed sharply cracks and other issues. 2. Accident of thrust tile burning accident mainly for axial displacement increases, the spindle tile sharply temperature over 85 ℃, temperature of thrust tile sharply and return oil temperature over 95 ℃, internal symbol is thrust tile sharply higher temperature and the oil return, interlock actions may even lead to support bearing temperature protection, the unit downtime. External symbol is thrust tile smoke, and the vibration may increase, at the same time the unit internal different sounds. Lubricating oil pressure drop below operating procedures permitted, oil system of the oil or lubricating oil pump cannot be put into operation. Bush burning accident phenomenon is: bearing sharply temperature and oil temperature rise sharply higher than 75 ℃, once the oil film damage, the vibration increases, bearing smoke. （ Green can steam turbine)