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The present situation and development trend of the horizonta

      Low-speed  horizontal split case pump is used widely, its flow is small, the head is high, from the leaf pump Euler equation that to achieve high head, can increase the impeller diameter and leaf exit angle, increase the speed and increase the number of leaves, However, these measures increase the pump head while bringing new problems, the impeller diameter D2 increases, the pump disk loss also increases; increase the blade exit angle, the corresponding blade angle decreases, the leaves shorter , The leaf slot is narrow and the plane diffusion is serious. The high speed of the pump will increase the centrifugal force and the Coriolis force of the liquid mass in the impeller, and the leaf inlet is easy to produce secondary reflow. The leaf outlet suction surface and the pressure surface velocity gradient are too large , Easy to produce wake and jet, etc .; and too many leaves will increase the number of leaves imported. Therefore, according to the traditional design method, the low efficiency of the centrifugal pump with low specific speed is low, the head and flow curve are prone to hump, and the flow rate of the small flow is easy to be unstable. The power and flow curve increases sharply with the increase of the flow rate. Area motor overload and other issues.
      In order to improve the low speed centrifugal performance, domestic scholars from the 20th century, 70 years to carry out a pilot study, has developed a number of better hydraulic performance of low-speed centrifugal pump. Summary The current low specific speed design theory and methods include increasing the flow design method, no overload design method, area ratio design method, length and length blade design method.
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