Precautions for the use of self-priming centrifugal pumps.
As a commonly used liquid conveying equipment, self-priming centrifugal pumps are widely used in industry, agriculture, urban water supply and other fields. In order to ensure the normal operation and prolonged service life of self-priming centrifugal pumps, here are a few things to pay attention to when using self-priming centrifugal pumps.
1. Preparation before installation.
Before installing a self-priming pump, the pump must first be thoroughly inspected. Ensure that the bolts are not loose, the power cord and plug are intact, and the motor insulation resistance is greater than 2 trillion ohms to ensure electrical safety. In addition, in order to prevent the occurrence of electric shock accidents, it is necessary to install security measures such as leakage circuit breakers or electric shock safety devices, and ensure that the grounding of the pump is reliable.
2. Working voltage and use environment.
The working voltage of the self-priming pump should be used in the range of +5%, -12% of the rated voltage to avoid damage to the motor due to too high or too low voltage. If the electric pump is used far away from the power supply, the power transmission line should be appropriately thickened to reduce the voltage drop and ensure the normal operation of the pump.
3. Water diversion and trial operation.
Before starting the self-priming pump, the inside of the pump body needs to be filled with diversion water. Then close the power switch, make the pump idle for about 1 minute, check whether the pump starts and runs normally, and whether the steering is correct. This step is important to ensure that the pump can absorb water smoothly and avoid cavitation when it is in use.
Fourth, the connection between the pump body and the pipeline.
After the pump body is secured, it is necessary to connect the water inlet and the foot valve with a steel or rubber pipe. The foot valve should be placed perpendicular to the horizontal plane, more than 30 cm from the bottom of the water, to avoid inhaling sediment. In addition, the elbow of the suction pipe of the self-priming pump should be controlled within 1 as much as possible, too many elbows will affect the self-priming performance of the pump, which may lead to inability to suction water or insufficient flow.
5. The use of industrial pumps and automatic booster pumps.
For industrial self-priming pumps and automatic self-priming booster pumps, the water storage tank needs to be filled with water before first use. After tens of seconds of power-on, the pump can automatically dispense water. In future use, there is no need to re-irrigate. During use, the motor should be kept dry, pay attention to the drop in water level, and ensure that the foot valve is not exposed to the water surface. When the temperature is lower than 4, the anti-freezing work should be done to avoid freezing and cracking the pump body.
6. Maintenance during the shutdown period.
If the self-priming pump is out of use for a period of time, the water in the pump body should be drained (the household automatic self-priming booster pump needs to be poured out of the water storage tank), the main parts should be scrubbed, coated with anti-rust oil, and placed in a ventilated and dry place for standby. This effectively prevents the pump body and parts from rusting due to moisture.
To sum up, the precautions for the use of self-priming centrifugal pumps cover many aspects such as installation, electrical safety, working voltage, water diversion test operation, pump body and pipeline connection, use of industrial pumps and automatic booster pumps, and maintenance during shutdown. Only by operating and maintaining in strict accordance with these precautions can the normal operation of the self-priming centrifugal pump be ensured and its service life prolonged. Hopefully, this information will be helpful to users who use self-priming centrifugal pumps.