The invention provides an optimum design method of a jet type self-absorbing
centrifugal pump. In order to solve the problems of inlet
impact loss and disc
friction loss and the problem that the shut-off point lift cannot be improved under the circumstance of the fixed
impeller outer
diameter, the optimum design method of carrying out
cutting on an inlet of an
impeller, arranging a
front cover plate and a rear cover plate in an inclined manner and arranging flow dividing blades is provided. According to the method, the
cutting length a and b of the two sides, namely the vertical side and the horizontal side of the inlet side are given, the
diameter Dt of the inclination position of the
front cover plate and the rear cover plate is given, the wall thickness
delta 1 of the
front cover plateand the rear cover plate at an outlet of the
impeller after inclination optimization is carried out is given, the number Z1 of long blades after flow dividing blades are arranged is given, the wrap angle phi 1 of the long blades after optimization is carried out is given, the inlet
diameter Dsi of the flow dividing blades is given, the
arc length S2 of the flow dividing blades is given, the
peripheral polarization theta 1 of the flow dividing blades is given, the inclination
angle alpha 2 of the flow dividing blades is given, and the parameter selection and optimization method of the thicknessof the flow dividing blades is given. The method is easy to implement and can effectively improve performance of the high jetting type self-absorbing
centrifugal pump.