Working Principle Of Self-priming Pump

For ordinary centrifugal pumps, if the suction liquid level is below the impeller, it should be pre-filled with water when starting, which is very inconvenient. order in pump memory

water,

The inlet of the suction pipe needs to be equipped with a bottom valve. When the pump is working, the bottom valve will cause a large hydraulic loss.

The so-called self-priming pump means that it does not need to be irrigated before starting (it still needs to be irrigated for the first time after installation), and after a short period of operation, the pump itself can suck up the water and put it into normal operation.

Self-priming pumps are divided into the following categories according to the principle of action:

1. Gas-liquid mixed type (including internal mixed type and external mixed type);

2. Water ring wheel type;

3. Jet type (including liquid jet and gas jet).

The working process of the gas-liquid hybrid self-priming pump: due to the special structure of the pump body of the self-priming pump, after the pump stops, the memory in the pump body will

There is a certain amount of water. After the pump is started again, due to the rotation of the impeller, the air and water in the suction line are fully mixed and discharged to the air-water separation chamber. The remaining air in the suction line is mixed until the gas in the pump and the suction line is completely discharged, self-priming is completed, and water is pumped normally.

The wheeled self-priming pump of water ring is that a water ring wheel and a water pump vane are combined in a housing, and the gas is discharged by means of the water ring wheel to realize self-priming. After the pump works properly, the passage of the water ring wheel and the water pump vane can be blocked by a valve, and the liquid in the water ring wheel can be bleed off.

The jet-type self-priming pump is combined by centrifugal pump and Jet injector (or sparger), relies on injection apparatus, causes vacuum to realize suction at the nozzle place.