Centrifugal pump works

Centrifugal pump is the use of impeller rotation and centrifugal motion of water to work. Before starting the pump, the pump housing and the suction pipe must be filled with water, and then start the motor so that the pump shaft drives the impeller and water to do high-speed rotation movement. Centrifugal movement of the water occurs and is thrown to the outer edge of the impeller and flows through the scroll casing Road into the pump pressure water pipeline.

Centrifugal pump structure

The basic structure of the centrifugal pump is composed of six parts are the impeller, pump body, pump shaft, bearings, seal rings, stuffing box.

1, the impeller is the core part of the centrifugal pump, its speed is high, the impeller blades play a major role in the impeller assembly before static balance experiment. The inner and outer surfaces of the impeller require smoothness to reduce the frictional loss of water flow.

2, also known as the pump casing, it is the main pump. To support the role of fixed, and with the bearing bracket to connect.

3, the role of the pump shaft is connected to the motor by a coupling, the motor torque to the impeller, so it is the main component of mechanical energy transmission.

4, the use of plain bearings are lubricants, refueling to the oil level line. Too much oil to ooze along the pump shaft, too little bearing but also overheating and burn accident! In the process of running the pump bearing temperature up to 85 degrees, the general operation at 60 degrees.

5, seal ring, also known as leakage ring.

6, stuffing box mainly by the filler, water seal ring, packing tube, packing gland, water seal tube. The purpose of the stuffing box is to close the gap between the pump housing and the pump shaft so that the water inside the pump does not flow outside and the outside air does not enter the pump. Always keep the pump vacuum! When the pump shaft friction with the filler to generate heat will depend on the water seal to live in the water seal ring so that the filler cooling! Maintain the normal operation of the pump. Therefore, during the inspection of the pump running inspection of stuffing box is a special note! Filler needs to be replaced after about 600 hours of operation.

Centrifugal pump flow and lift less than what is the reason?

1. Centrifugal pump or suction tube leaks;

2. Suction pipe or centrifugal pump inlet blockage, inhalation resistance is too large;

3 impeller mouth ring wear gap is too large;

Impeller clogged or severely worn out;

Centrifugal pump rotation direction is not correct or impeller mounted anti;

6. centrifugal pump outlet valve is not open or open enough;

7. Motor speed is not enough;

8. centrifugal pump selection or performance does not match.

Approach:

Check and clean suction valve and pipe

2. Clear impeller blockage or replace the impeller;

3. Replace the impeller seal mouth ring;

4. Check, eliminate leaks;

5. Open the pump outlet valve, and adjust the valve opening;

6. Adjust the pump rotation direction;

7. Increase the motor speed;

8. Check the pump performance parameters, whether the conditions meet the conditions, and be adjusted.

Centrifugal pump Matters needing attention

Centrifugal pump is a vane pump. Depending on the interaction between the vane and the liquid, the vane conveys the mechanical energy to the liquid by rotating the impeller during rotation, so that the pressure of the liquid can be increased to achieve the purpose of transporting the liquid. Centrifugal pump to start to pay attention to four points:

â‘  Centrifugal pump at a certain speed produced by the head has a limited value. Operating point flow and shaft power depend on the condition of the system of the system connected to the pump (potential difference, pressure difference and line loss). Head changes with the flow.

â‘¡ work stable, continuous delivery, flow and pressure pulsation.

â‘¢ generally no self-absorption capacity, the need to pump the first filled with liquid or pipe pumping to a vacuum before starting work.

â‘£ centrifugal pump discharge valve in the off state to start, the vortex pump and axial flow pump in the valve fully open state to reduce starting power.

Because the centrifugal pump is formed by the impeller centrifugal force to lift the vacuum suction, so the centrifugal pump starts, you must first close the gate valve, irrigation. Above the water level above the impeller, discharge the air in the centrifugal pump before starting. After start-up, a vacuum is formed around the impeller and the water is sucked upward. Its gate valve can be opened automatically and the water can be lifted. Therefore, the valve must be closed first.

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