Mixed flow pump performance and centrifugal pump, axial-flow distinction
Mixed flow pump from the appearance, structure are between centrifugal pump and axial pump, Mixed flow pump pumping principle, impeller's high speed rotating, both creates centrifugal pump centrifugal force, but also has the push of axial-flow lift, mixed flow pump by two forces mixed action for pumping. Mixed flow pump performance is also between centrifugal pump and axial pump, when comparing with centrifugal pump, head is lower, and flow is larger; compared with axial pump, head is higher, flow is lower. This supply us a selection of adjust measures to local conditions to our vast, complex terrain.
Mixed flow pump performance uses working parameters to represent. For example flow, head, power, efficiency, rotational speed, etc. Under a certain speed, using flow as a variable, namely if changing pump flow, the pump head, power and efficiency etc., all change. Take this correlation change law, comprehensive blazoned several curve to say, this is the pump performance curve. Mixed flow pump performance curve shape is between centrifugal pump and axial pump, to high head mixed flow pump, its flow and head, flow and power relationships change rule is close to the centrifugal pump, when using, can use closing valve start, at this time, power is minimum and motor is safe. To low head mixed flow pump, change rule between performance parameters is close to axial-flow pump, on using, it is unfavorable to use closed valve start, and should open valve start, the power is relatively small, motors are unlikely to be burned.
In view of the above characteristics, mixed flow pump applies to hilly region farm irrigation
