Classification Self-priming pump according to the principle

    What is the working principle of the self-priming pump? Ordinary centrifugal pump, if the suction surface below the impeller, the start should be pre-irrigation, very convenient. In order to pump water in the memory, suction pipe inlet valve needs to be installed bottom, pump work, the end of the valve caused great hydraulic losses. The so-called self-priming pump, that is, before starting without irrigation (after installation, the first start still need irrigation), after a short run, by the role of the pump itself, that is, the water sucked up and put into normal work.

    Self-priming pump according to the principle of action is divided into the following categories: 1. Gas-liquid mixture (including internal mixing and external mixing); 2. Water ring wheel; 3. Jet type (including liquid jets and gas jets). Gas-liquid mixed-type self-priming pump working process: Because of the special structure of the self-priming pump pump body, the pump has a certain amount of water after the pump stops, the pump starts again due to impeller rotation, suction pipe air and water And the water in the upper part of the gas-water separation chamber overflows, and the water in the lower part returns to the impeller and mixes with the remaining air in the suction pipe until all the gas in the pump and the suction pipe is discharged, Suction, and normal pumping. Water ring wheel self-priming pump is a combination of water ring wheel and pump impeller in a shell, with the help of water ring round of the gas discharge, self-priming. When the pump is working properly, through the valve cut off the water ring wheel and pump impeller channel, and let go of the water ring round of the liquid. Jet-type self-priming pump, by the combination of centrifugal pumps and jet pumps (or injectors), relying on the jet device, in the nozzle to achieve a vacuum to achieve suction.