Coupling of the transformation. After comparison, the coupling was improved. And the positioning of the half-ring with the positioning of the shaft, the shaft is driven by the key, half-card ring and up and down the axis to match, to ensure that the upper and lower axis positioning, the upper and lower shaft axial size can be through the fit The radial dimension of the shaft is mainly ensured by the coupling accuracy of the sleeve and the upper and lower shafts and the axial positioning of the retaining ring, as shown in Fig. This is a better method of jointing, reducing the length of the rotor, limiting the verticality, strong, eliminating the rotor up and down the movement problem, improve the stability of the operation. Reconstruction of the middle of the pump. After accounting, we put the liquid pump liquid from the original length of 3600mm to 3000mm shortened, shortening each segment 200mm, support spacing reduced, greatly improving the rigidity of the rotor, the hub of the rotor Ye Lun found pendulum is 0.45 ~ 0.7mm, the guide satisfies Bearing on the deflection angle requirements. In order to ensure that the depth of the suction in the same, in the suction port to increase the length of the suction pipe. Increase throttle device. Add a long throttling bushing behind the impeller to reduce the pressure behind the impeller and open four ¢ 50mm holes in the support tube to increase the leakage of the media at the support tube.