knowledge about centrifugal pumps

Ordinary centrifugal pump, if the suction surface is under the impeller, it should be pre-irrigated, very inconvenient.In order to pump memory water, suction pipe inlet needs to install the bottom valve, pump work, the bottom valve causes great hydraulic loss.

  The so-called fire pump, is before start without irrigation (the first time you start after installation is still need to infuse water), after a short time, by the pump itself, namely can suck up the water, into the normal work.

1. type of self-priming pump

The principle of action is divided into the following categories: 1. Gas-liquid mixture (including internal and external mixing);2. Water ring wheel type;3. Flow type (including liquid jet and gas jet).

2. Working principle

(1) working principle of gas-liquid hybrid self-priming pump.

Gas-liquid hybrid self-priming pump working process: due to the special structure of the self-priming pump pump body, pump after stalling, there is a certain amount of water in the pump body, pump starts again due to the impeller rotation, suction pipe fully mixing of air and water, and into the gas water separation chamber, the upper part of the gas water separation chamber gas overflow, the lower the water back impeller, mixed with the surplus air inlet line again, until all the pumps and suction tube of gas discharge, complete the imbibition, and normal pumping.

(2) the working principle of the water ring wheel self-priming pump.

The water ring wheel self-priming pump is composed of the water ring wheel and the pump impeller in one shell, and the gas is discharged through the water ring wheel to realize self-absorption.When the pump is working properly, the valve can be used to cut off the passage of the water ring and the pump impeller and release the liquid in the water ring wheel.

3. the working principle of the jet type self-priming pump

A combination of a centrifugal pump and a pipe pump (or injector), which relies on a spray device to create a vacuum at the nozzle.