The principle of self-priming of diesel engine 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). 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. 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. The jet type self-priming pump is composed of a centrifugal pump and a jet pump (or injector). It relies on a spray device to create a vacuum at the nozzle. The wine pump

According to the type of auxiliary engine of pump, it is divided into motor matching diesel engine self-priming pump and diesel engine supporting self-priming pump.

The structure and working characteristics of the self-priming function of the self-priming pump of diesel engine can be divided into internal sliding type, outer sliding type, water ring wheel type and other types. Transmission mode has direct transmission (including internal shaft) and belt drive. The inlet diameter is 25 ~ 200 mm.

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