Multistage centrifugal pump with the discharge device

摘要

The invention relates to the field of pump and can be used in multistage centrifugal pumps with unloading devices, to carry axial load pump rotors. This utility model solves the problem of increasing the service life and efficiency multistage centrifugal pumps increase the reliability of the discharge device, decreasing the flow of working fluid through a hydraulic balancing device at the nominal operating conditions of the mechanical alignment of the gap across the working plane, eliminating errors of manufacturing, assembly and rotor deflections. For this serves unloader centrifugal pump, comprising a cylindrical sleeve, hydraulic balancing device, the discharge drive and the end annular gap, wherein the hydraulic balancing device is mounted on the pump cover by means of a spherical bearing washer. In this spherical bearing formed with a radius R, and the sphere center located on the axis of the shaft, is located at a distance of not more than 1/2 R from the plane of the end gap. Mechanical working surfaces hydraulic balancing device, and the discharge oil pump drive coated dissimilar materials without causing friction in their sparking. 1 shows a longitudinal section of a multistage centrifugal pump comprising an inlet 1 and the pressure cover 2, with the housing sections guiding devices 3, a rotor 4 with impellers and the discharge device 5. Figure 2 shows a longitudinal section of the discharge device, which comprises a sleeve 6 , unloading the disc 7, 8 hydraulic balancing device with a spherical bearing, a spherical washer 9, the fixing screws 10, the adjusting pin 11, 12 and 13 are o-rings.