How to properly adjust the blade angle of the axial flow pump

How to properly adjust the blade angle of the axial flow pump
Axial flow pump blade angle adjustment method is the manufacturer according to the size of the water pump and the use of angle difference method, in the impeller seat and the blade with the hole on the drilling hole. As shown in Figure 2, the impeller seat A, B, C , D, E, leaf disc A, B, C, D, E for the corresponding positioning hole, positioning hole how much, according to their respective adjustment range.
Such as:
1) ± 0 °, ± 2 °, ± 4 °, ± 6 ° must be drilled when the corresponding 7 holes;
2) ± 0 °; ± 2 °; ± 4 °, it must be drilled 5 corresponding holes;
3) ± 0 °; ± 2 °, it is only need to drill the three corresponding holes.
Figure 2 as an example to illustrate: the leaves and impeller seat C 'and C coincide with the fixed is ± 0 ° that the basic angle, the blade angle adjustment is carried out on this basis. (The clockwise rotation) is less than the basic angle of the positive angle (counterclockwise turn), the leaves on the B 'hole on the impeller seat on the B hole, that is, + 2 °, the same A 'hole alignment A hole is fixed to +4 °, the D' hole at the D hole fixed is -2 °, the E 'hole and E hole fixed is -4 °, that is, the blade angle is correct The adjustment method is "the angle difference method of the respective seats".