Self-priming pump is based on the special structure of the pump itself and the generation of self-priming single stage single-priming centrifugal pump, known as self-priming centrifugal pump.
Compared with the ordinary centrifugal pump, there are significant differences in the structure of the pump body: first, the pump inlet position is improved, and sometimes installed on the suction valve;
Second, an air-water separation chamber is set up at the outlet side.
External self-priming pump, is in the pump with self-priming device, such as with a vortex pump, water ring vacuum pump, jet pump and manual pump.
Compared with ordinary centrifugal pump, self-priming pump has compact structure and simple operation, which not only saves the trouble of large amount of water diversion before starting irrigation, but also saves the low valve of inlet pipe, reduces the inlet resistance and increases the water output of pump, but the efficiency is 3% ~ 5% lower than that of ordinary centrifugal pump of the same specification.
More self-priming pump is used in light and small sprinkler irrigation units and pipe irrigation units.
Self-priming centrifugal pump varieties and specifications, there are ZX type, TC type, BPZ type and ZB type.
(1) ZB performance range flow rate 2 ~ 200 meters 3/ hour, head 8 ~ 100 meters, supporting power 0.25 ~ 45 kw.
(2) Structural characteristics according to the type of pump supporting power machine is divided into motor supporting self-priming pump and diesel engine supporting self-priming pump.
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 mode includes direct link transmission (including inner shaft) and belt transmission.
Import diameter of 25 ~ 200 mm, 10 diameters, 54 specifications.