Working principle and structure of WFB type self-control pump without seal

The so-called self-priming pump means that water is not needed before startup (water is still needed after * startup after installation) After a short period of operation, water can be sucked up and put into normal operation by the function of the pump itself Ordinary centrifugal pump, if the suction liquid level is below the impeller, it is inconvenient to fill water in advance when starting In order to store water in the pump, a bottom valve is needed at the inlet of the suction pipe When the pump is working, the bottom valve causes great hydraulic loss The self-priming pump is divided into the following categories according to the principle of action: 1 Gas liquid mixing type (including internal mixing type and external mixing type): due to the special structure of the self-priming pump body, there is a certain amount of water in the pump body after the pump stops running After the pump starts again, due to the rotation of the impeller, the air and water in the suction pipeline are fully mixed and discharged to the air-water separation chamber The gas in the upper part of the air-water separation chamber overflows, and the water in the lower part returns to the impeller and re connects with the suction pipeline The remaining air is mixed until all the gas in the pump and suction pipe is discharged, self-priming is completed, and normal water pumping is completed 2 Water ring wheel type: the water ring wheel and the pump impeller are combined in a shell, and the gas is discharged with the help of the water ring wheel to realize self-priming When the pump works normally, the passage between the water ring wheel and the pump impeller can be cut off through the valve, and the liquid in the water ring wheel can be discharged 3 Jet type (including liquid jet and gas jet): it is composed of centrifugal pump and jet pump (or injector) It can draw vacuum at the nozzle by means of jet device.