Municipal drainage pumping station in the management of urban facilities undoubtedly occupy a very important position. Drainage pumping station can be related to the normal operation of urban residents learning, work and life. The proper management and maintenance of the drainage facilities of the drainage pumping station is the key to ensure the normal operation of the drainage pumping station. After the pump is installed for commissioning and during normal operation, a variety of problems often occur. Combined with many years of experience, submersible pump common fault analysis, and put forward preventive measures and elimination methods. First, the submersible pump operation abnormal vibration, instability 1, the pump operation abnormal vibration, instability, the main reason: (1) the pump base anchor bolts are not tightened or loose; (2) the outlet pipe without additional support, Pipeline vibration affects the pump; (3) Impeller quality imbalance or even damage or loose installation; (4) Pump up and down the bearing damage. 2, the elimination of measures (1) evenly tighten all anchor bolts; (2) the water outlet pipe set up independent and stable support, not to pump the water pipe flange load; (3) repair or replacement of the impeller; (4) replacement Pump up and down bearings. Second, the submersible pump water or flow less than 1, the submersible pump in the operation of the flow often appear insufficient or no water, the main reasons: (1) the installation of the pump is too high, making the impeller immersion depth is not enough, resulting in a decline in the pump water; ( 2) The pump is turned to the opposite direction; 3) The outlet valve can not be opened; 4) The outlet pipe is not smooth or the impeller is blocked; 5) The wear ring at the bottom of the pump is worn seriously or blocked by debris; 6) Large or too high viscosity; (7) impeller off or damaged; (8) more than one pump shared pipeline output, there is no installation of one-way valve or one-way valve lax. 2, the exclusion measures (1) to control the allowable deviation of the pump installation elevation can not be arbitrarily expanded; (2) before the pump running idle idle motor, check the steering to make it consistent with the pump. (3) check the valve, and often on the valve for maintenance; (4) clean up the pipeline and impeller blockage, often salvage debris in the reservoir: (5) Clean up debris or replace the wear ring; (6) to find the reasons for water quality changes and to be dealt with; (7) to strengthen or replace the impeller; (8) check the cause of the installation or replacement of one-way valve. Third, the current is too large Motor overload or over-temperature protection 1, causing the current overload Motor overload or over-temperature protection The main reasons for the action: (1) working voltage is too low or too high; (2) Touch or impeller friction with the seal ring; (3) low head, the flow caused by large motor power does not match the characteristics of the pump; (4) pumping greater density or higher viscosity; 2, the exclusion measures (1) check the power supply voltage, adjust the transmission voltage; (2) to determine the location of the friction parts to eliminate the fault; (3) adjust the valve to reduce the flow so that the motor power and pump match; (4) Change the working conditions of the pump; (5) replace the bearings at both ends of the motor. Fourth, the insulation resistance is low 1, low insulation resistance The main reasons: (1) the power cord is immersed in the water immersed in the terminal or the power cord, signal line damage caused by water; (2) mechanical seal worn or not installed in place; (3) O-ring aging, loss of function. 2, the exclusion measures (1) replace the cable or signal line, drying the motor; (2) replace the mechanical seal up and down, drying the motor; (3) replace all seals, drying the motor. Fifth, the pump pipe fittings leak 1, the pump pipe, pipe or flange connections, often have obvious leakage of water phenomenon. The main reasons: (1) The pipe itself is flawed, without any pressure test; (2) The gasket connection at the flange connection is not handled properly; (3) The flange bolt is not tightened in a reasonable manner. 2, the exclusion of defective tubes should be repaired or even replaced, the center of the docking pipe deviation should be removed from the rearrangement alignment, after the connection bolts should be inserted in the basic state of freedom to tighten the pipe after all the installation, The system should be the compressive strength and leakage test. Must be replaced by new ones. Six, reversing the pump down 1, the pump motor will reverse the pump after the power outage, the main reason is because the outlet pipe in the check valve or failure to shoot the door. 2, the precautionary measures should be checked before installation, check valve installation direction should be correct, pat door center alignment, opening and closing should be flexible. Check the check valve or flaps frequently during operation, repair or replace the check valve or flapper for the damaged parts. Seven internal pump leakage 1 submersible pump leaks, resulting in insulation damage, bearing flooding, alarm system alarm, forcing the unit to stop running. The main reason: submersible pump dynamic seal (mechanical seal) or static seal (cable seal imports, 0 ring) damage caused by water seepage, power cable or signal cable damage caused by seepage. A variety of alarm signals such as flooding, leakage, humidity and other alarm shutdown. 2, the measures to be taken before the installation, should check the quality of the sealing parts; installation must ensure that the sealing parts of the contact surface is good; check the motor phase and ground before running insulation resistance and sensing components of the alarm system is intact. When any of the above faults occur during operation, replace all damaged seals and cables and dry the motor. Do not reuse sealed seals and cables.
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