Key points for submersible water pumps inspection and detection before operation

Key points for submersible water pumps inspection and detection before operation

Submersible pump before use of choice is very important, should according to the actual situation of water supply and requirement of working time and pump water to the selected pump models. First choose to lift is greater than the water inlet and outlet of the gap between;

The second is the pump flow to be able to satisfy the requirement of drainage and irrigation. There are several kinds of submersible pump, the motor in the line with oil contamination and water invasion and is dry before make the submersible pump with must look at the instruction, can't make a mistake, not for a long time, must have to get the impeller before use, or you'll burn bag because of the need not stuck for a long time.

Open pump, the suction pipe and pump must be filled with liquid. After open pump, high-speed rotating impeller, the liquid with the blades rotate together, in under the action of centrifugal force, fly away from the impeller to injection, injection of the liquid in the pump shell gradually spread of indoor speed slow, pressure increase gradually, and then from the pump discharge, the discharge pipe flow.

At this point, in the center of the blade due to liquid was dumped into the surrounding formation is no air and no liquid vacuum low pressure area, fluid in the pool liquid under the action of atmospheric pressure on surface of the pool, the suction pipe into the pump, the liquid is continuously from the liquid pool was sucking up and continuously from the discharge pipe flow.1. The bearing work is normal(1) the oil temperature: not more than 60 ℃.(2) the oil level: no oil ring rolling bearing, the oil level should be not less than ball center;

Have a ring of bearing, the oil level should be able to bury oiled one 5 the diameter of the ring. In order to monitor the oil level, there is oil level gauge or oil mark on the bearing.(3) oil: can't fill into the impurities, can't emulsion or black.(4) have different sound: especially when rolling bearing, damage usually appear abnormal sound.2. The vacuum gauge, pressure gauge, the ammeter reading is normal(1) vacuum gauge pointer can't swing is too big, too much may make the pump inlet vaporize, vacuum gauge reading also not too high, too high may be the inlet valve jam, stuck or suction decreased the water level.(2) export pressure gauge reading is too low, could be a sealing rings, guide vane set severe wear., rotor clearance is too large, or the outlet valve opening is too large, large flow, low head.(3) current meter reading is too large, may be a large flow, or is fixed, the friction between the rotor.3. If there is a vibration submersible pump body

Submersible pump vibration amplitude is generally not more than 0.08 mm.The vibration reasons:(1) the center of the submersible pump and motor is not straight.(2) submersible pump body or loose bolts of the motor, or foundation is not firm.(3) bearing cover tight force is not enough, make the bearing bush appeared to beat in the body.(4) the quality of rotor unbalance.(5) the volute pump, especially some of the highest head volute pump, in the small flow, also can have different levels of vibration, this is because at this time have the effect of the radial force on the rotor.

In export, when the valve opens to a certain vibration will disappear.4. The seal is normal1. The packing should be able to a little drop of water, not too loose or too tight, otherwise the hot smoke. But too loose will be a large number of leakage, easy to flee into the bearing oil emulsion. Should be replaced periodically packing, hardening is less than the shaft sealing role.

Soak in the long run will make packing worse.2. End machine before running to fill liquid, prevent dry grinding, long time no boot artificial plate to get off the devices, the easy crystallization, granular medium, the medium temperature of 100 degrees or higher, the ideal way is to take appropriate washing, filtering, cooling measures and auxiliary sealing device.