1. Mine multi - stage centrifugal pump before driving the preparatory work
Mine multi-stage centrifugal pump before driving, the operator should carry out the following checks to ensure the safe operation of the pump.
(1) hand slowly rotating coupling or pulley to observe the pump is flexible and smooth, the pump with or without debris, whether the collision; bearing with or without noise or uneven phenomenon; packing elastic is appropriate; belt Elasticity is moderate. If abnormal, should be adjusted.
(2) Check and tighten all bolts and screws.
(3) Check the bearings in the lubricating oil and grease is pure, or should be replaced. Grease to join the volume of the bearing room 2/3 is appropriate, oil should be within the scope of oil standard.
(4) Check the ISW horizontal pipe centrifugal pump motor lead wire connection to ensure the normal rotation of the pump direction. Normal work, you can drive to check the steering, such as steering the contrary, it should stop in time, and any two-wire motor connected to the location of the introduction.
(5) centrifugal pump should be closed gate start, gate valve closed after start time should not be too long, generally not more than 3 ~ 5min, so as to avoid water circulation in the pump fever, damage to parts.
(6) need to irrigation water pumping device, should be priming water. In the irrigation water, the rotation of the clutch or pulley by hand, so that exhaust air exhaust within the impeller.
2. Mine multi-stage centrifugal pump operation Note During the operation of the pump, the operator should strictly observe the post, strengthen the inspection, timely detection and timely treatment.
Under normal circumstances, should pay attention to the following matters.
(1) check the work of various instruments is normal, such as ammeter, voltmeter, vacuum gauge, pressure gauge and so on. If the reading is too large, too small or the pointer is violent beating, should promptly identify the cause, be excluded. If the vacuum gauge reading rises suddenly, it may be that the water intake is clogged or the water level of the water tank drops to increase the suction. If the pressure gauge reading drops suddenly, it may be the air leakage, suction air or speed decrease.
(2) ISWD low-speed horizontal pipeline centrifugal pump operation, the tightness of packing should be appropriate. Gland too tight, stuffing box water seepage too little, no water seal, lubrication, cooling effect, easily lead to fill heat, hardening, speed up the pump shaft and sleeve wear, increase the mechanical loss of the pump; packing too loose , Too much water seepage, resulting in a large number of water leakage, or the air into the pump, reducing the volumetric efficiency of the pump, resulting in reduced water, or even water. Under normal circumstances, the filler tightness per minute to seepage of about 20 drops is appropriate, can be used to adjust the packing gland thread.
(3) bearing temperature rise should generally not exceed 30-40 ℃, the maximum temperature shall not exceed 60-70 ℃. Bearing temperature is too high, will make the failure of lubrication, burning bearing or rolling caused by the body rupture, or even cause shaft or shaft thermal expansion killed the accident. Temperature is too high should stop immediately check the reason, promptly ruled out.
(4) to prevent the pump inlet mouth submerged depth is not enough, resulting in the vicinity of the water El generated vortex, so that the air into the pump. Should be promptly clean up the trash rack and into the pond of floating debris, so as not to block the intake nozzle. Both will increase the water resistance. Resulting in decreased pressure on the gossip, or even cause cavitation.
(5) Note that the oil ring, to make it free to do with the pump shaft is not synchronized rotation. At any time to listen to the sound of the unit is normal.
(6) stop the water before the gate valve closed, the implementation of closed parking. Then, close the vacuum gauge and pressure gauge on the valve, the pump and motor surface water and oil wipe. In the absence of heating equipment, housing, parking in winter, to consider the water pump will not crack.
3. Common Faults and Elimination of Mine Multi - stage Centrifugal Pump
Mine multi-stage centrifugal pump common failure phenomenon is not a water pump or water shortage, motor overload, pump vibration or noise, heat, packing seal leakage and so on.
Keywords:Mine, multi - stage centrifugal pump, operation and maintenance
Mine multi-stage centrifugal pump before driving, the operator should carry out the following checks to ensure the safe operation of the pump.
(1) hand slowly rotating coupling or pulley to observe the pump is flexible and smooth, the pump with or without debris, whether the collision; bearing with or without noise or uneven phenomenon; packing elastic is appropriate; belt Elasticity is moderate. If abnormal, should be adjusted.
(2) Check and tighten all bolts and screws.
(3) Check the bearings in the lubricating oil and grease is pure, or should be replaced. Grease to join the volume of the bearing room 2/3 is appropriate, oil should be within the scope of oil standard.
(4) Check the ISW horizontal pipe centrifugal pump motor lead wire connection to ensure the normal rotation of the pump direction. Normal work, you can drive to check the steering, such as steering the contrary, it should stop in time, and any two-wire motor connected to the location of the introduction.
(5) centrifugal pump should be closed gate start, gate valve closed after start time should not be too long, generally not more than 3 ~ 5min, so as to avoid water circulation in the pump fever, damage to parts.
(6) need to irrigation water pumping device, should be priming water. In the irrigation water, the rotation of the clutch or pulley by hand, so that exhaust air exhaust within the impeller.
2. Mine multi-stage centrifugal pump operation Note During the operation of the pump, the operator should strictly observe the post, strengthen the inspection, timely detection and timely treatment.
Under normal circumstances, should pay attention to the following matters.
(1) check the work of various instruments is normal, such as ammeter, voltmeter, vacuum gauge, pressure gauge and so on. If the reading is too large, too small or the pointer is violent beating, should promptly identify the cause, be excluded. If the vacuum gauge reading rises suddenly, it may be that the water intake is clogged or the water level of the water tank drops to increase the suction. If the pressure gauge reading drops suddenly, it may be the air leakage, suction air or speed decrease.
(2) ISWD low-speed horizontal pipeline centrifugal pump operation, the tightness of packing should be appropriate. Gland too tight, stuffing box water seepage too little, no water seal, lubrication, cooling effect, easily lead to fill heat, hardening, speed up the pump shaft and sleeve wear, increase the mechanical loss of the pump; packing too loose , Too much water seepage, resulting in a large number of water leakage, or the air into the pump, reducing the volumetric efficiency of the pump, resulting in reduced water, or even water. Under normal circumstances, the filler tightness per minute to seepage of about 20 drops is appropriate, can be used to adjust the packing gland thread.
(3) bearing temperature rise should generally not exceed 30-40 ℃, the maximum temperature shall not exceed 60-70 ℃. Bearing temperature is too high, will make the failure of lubrication, burning bearing or rolling caused by the body rupture, or even cause shaft or shaft thermal expansion killed the accident. Temperature is too high should stop immediately check the reason, promptly ruled out.
(4) to prevent the pump inlet mouth submerged depth is not enough, resulting in the vicinity of the water El generated vortex, so that the air into the pump. Should be promptly clean up the trash rack and into the pond of floating debris, so as not to block the intake nozzle. Both will increase the water resistance. Resulting in decreased pressure on the gossip, or even cause cavitation.
(5) Note that the oil ring, to make it free to do with the pump shaft is not synchronized rotation. At any time to listen to the sound of the unit is normal.
(6) stop the water before the gate valve closed, the implementation of closed parking. Then, close the vacuum gauge and pressure gauge on the valve, the pump and motor surface water and oil wipe. In the absence of heating equipment, housing, parking in winter, to consider the water pump will not crack.
3. Common Faults and Elimination of Mine Multi - stage Centrifugal Pump
Mine multi-stage centrifugal pump common failure phenomenon is not a water pump or water shortage, motor overload, pump vibration or noise, heat, packing seal leakage and so on.
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