Axial pump and centrifugal pump works different, it is thrust by oblique wing blade arising from the pumping of. According to the wing theory, when a symmetrical, while consistent with its axis of symmetry and airflow v blade wing it suffered the same force and airflow direction, called resistance. But when it is not in the direction of airflow from the symmetry axis at an angle α (called angle of attack) it suffered from a certain angle on the force is generally not flow direction, it can be divided into two components. Consistent with the direction of air flow resistance component called D; component perpendicular to the direction of gas flow, said lift L. When the aircraft lift to support the weight of the aircraft, the resistance to impede the flight, required thrust generated by the propellers or recoil ejection of gas to be overcome, so the design of the wing should try to increase lift and reduce drag. Francis pump is to rely on the centrifugal force and the axial thrust mixing to transport liquid, so called mixed-flow pump. From the works, when the prime mover driven rotation of the impeller, the effect of the liquid on both axial thrust centrifugal force there is centrifugal and axial comprehensive. So it is between a centrifugal and axial flow pump between. Francis higher specific speed centrifugal pump is lower than the pump, generally between 300-500. Its head higher than the axial flow, but smaller than the low-flow ratio centrifugal pump, greater than centrifugal pumps. Francis pump is mainly used for agricultural irrigation, and also for urban drainage, can be used as thermal power circulating pump use. Official website: http: //www.ythlby.cn/