Self-priming pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long service life and strong self-priming capability. The pipeline does not need to be installed with a bottom valve. It is only necessary to ensure that the pump body has a quantitative liquid before storage. Different materials can be self-priming pumps of different materials.
The working principle of the self-priming pump is that the pump casing is filled with water before the pump starts (or there is water in the pump casing). After the start, the impeller rotates at a high speed to make the water in the impeller channel flow toward the volute. At this time, the inlet forms a vacuum, so that the inlet water stops the door, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel.
Features:
1. Strong sewage discharge capacity: special impeller anti-blocking design ensures that the pump is efficient and non-blocking.
2, high efficiency and energy saving: the use of excellent hydraulic model, the efficiency is 3 to 5% higher than the general self-priming pump.
3, self-priming performance: self-priming height is 1 meter higher than the general self-priming pump, and the self-priming time is shorter.
Types
Self-priming pumps are divided into the following categories according to their principle of action:
1. Gas-liquid mixing (including internal mixing and external mixing);
2. Water ring wheel type;
3. Jet type (including liquid jet and gas jet).
Working process of gas-liquid hybrid self-priming pump: Due to the special structure of the pump body of the self-priming pump, after the pump stops, there is a certain amount of water in the pump body. After the pump is started again, the air and water in the pipeline are sucked in due to the rotation of the impeller. 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 lower water returns to the impeller, and is re-mixed with the remaining air in the suction line until the gas in the pump and the suction pipe is completely discharged. Suck and pump normally. The water ring wheel type self-priming pump combines the water ring wheel and the water pump impeller in one casing, and discharges the gas by means of the water ring wheel to realize self-priming. When the pump is working normally, the passage of the water ring wheel and the pump impeller can be intercepted by the valve, and the liquid in the water ring wheel can be drained. The jet self-priming pump is a combination of a centrifugal pump and a jet pump (or ejector), which relies on a spraying device to cause a vacuum at the nozzle to achieve suction.
According to the type of power supply of the pump, it is divided into self-priming pump for motor and self-priming pump for diesel engine.
According to the structure and working characteristics of self-priming function, it can be divided into inner sliding type, outer sliding type, water ring wheel type and other types. The transmission has a direct drive (including the inner shaft) and a belt drive. The diameter of the inlet is 25 to 200 mm.
