According to the working principle of self-priming pump can
According to the working principle of self-priming pump can be divided into three categories
What is the working principle of a self-priming pump? For ordinary centrifugal pumps, if the suction liquid level is below the impeller, it should be filled with water before starting, which is very inconvenient. In order to store water in the pump, a bottom valve needs to be installed at the inlet of the suction pipe. When the pump is working, the bottom valve causes a great hydraulic loss. The so-called self-priming pump does not need to be filled with water before starting (it still needs to be filled at the first start after installation). 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 mixing type (including internal mixing and external mixing);
2. Water ring wheel type; The water ring wheel self-priming pump combines a water ring wheel and a water pump impeller in a shell, and uses the water ring wheel to discharge gas to achieve self-priming. When the pump is working normally, the channel of the water ring wheel and the water pump impeller can be blocked by the valve, and the liquid in the water ring wheel can be discharged. The jet self-priming pump is a combination of a centrifugal pump and a jet pump (or ejector). It relies on a jet device to create a vacuum at the nozzle to achieve suction.
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 self-priming pump body, after the pump stops, there is a certain amount of water in the pump body. After the pump is restarted, the air and water in the pipeline are sucked due to the rotation of the impeller. It is fully mixed and discharged to the gas-water separation chamber. The gas in the upper part of the gas-water separation chamber overflows, and the water in the lower part returns to the impeller, and remixes with the remaining air in the suction pipe until all the gas in the pump and suction pipe is discharged. Suck and pump normally.
