250QJ Series Vertical Water Irrigation Pumps
At the top of submersible motor pump,the centrifugal pump is connected with motor by rigid shaft coupling.The bearing is water lubricated.The backpressure valve is fixed on the top of the pump to avoid the working parts being damaged by the returned water in pump when the submersible motor pump stops.The water in pump can flow away through the drainage hole in the valve in case the pump is broken in winter.(Note:There is no backpressure valve in low head submersible motor pump).
Motor Part: At the bottom of submersible motor pump,closed water-filled structure,guiding bearing and thrust bearing use water lubricated material.The compensation diaphragm is fixed on the bottom of motor to adjust the differential pressure caused by the ring temperature of motor.The sand-proof structure is fixed on the top of motor to prevent mud and sands to enter inside of motor.
QJ submersible pump consists of multi-stage centrifugal impeller in series. The pump stage is connected by a flat rib or bolts, each of which is supported by a rubber (or copper) bearing, with no check valve at the top of the pump. YQS submersible motor is a closed water-filled three-phase asynchronous motor, the winding is made of water-resistant continuous sealing structure. Both the bearing and the thrust bearing are water lubricated bearings. The upper part of the motor is equipped with sand control mechanism to prevent the sediment from entering the motor internal control.
1. 380V (deviation≤5%), 50Hz (deviation≤1%), 3 phases
2.Electric motor must be full of clean water
3.The first piece of impeller of pump should be at least 2m or more below dynamic water level. The distance from Pump to static water level should be not more than 70m. The distance from motor base to well bottom should be not less than 3m.
4.Water temperature should be not more than 20℃
5.Sand content of water (based on mass of sand) should be not more than 0.01%
6.PH should be 6.5-8.5
7.The content of hydrogen sulfide in water should be not more than 1.5mg/l
8.The content of chloride ions should be not more than 400mg/l
9.Water yield of water source should satisfy the demand of pump running.
175QJ Submersible Pump Model Description:
250- the overall diameter of the pump, that is, the diameter of the wells can not be less than 150mm;
QJ - well submersible pump
40 - Pump design point flow
22- pump design point head
1.100% copper rewindable wire
3.Fast delivery time
4.Dry run pretection
The Choice of Submersible Motor Pump:
The followig content should be understood in order to choose and operate submersible motor pump correctly:
1 Understanding all clauses mentioned in operation conditions
2 Pay attention to the diameter and the depth of well
3 Pay attention to the static water level and the flowing water level of well
4 Pay attention to the water surging capacity of the well
The capacity,head,and the diameter of full set should be shosen according to the water surging capacity,the depth and the diameter of well.The water surging capacity of well should meet the requirement of the capacity of submersible motor pump,so that the submersible motor pump can be under the water totally when it works.
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Product Categories : QJ Type Submersible Well Pump