Multi-stage centrifugal pump axial force balance device

Abstract

The invention relates to the technical field of centrifugal pumps, in particular to a multi-stage centrifugal pump axial force balance device which is provided with a pump shaft, a bearing body, an inner end cover and an outer end cover. The multi-stage centrifugal pump axial force balance device is characterized by being provided with an angular contact ball bearing, a bearing box, a location bolt, a location nut, a fastening bolt, a regulating stud, a fixed nut and a regulating nut; the inner end cover is provided with a location thread hole; the inner circle of the angular contact ball bearing is fixedly connected with the water outlet end of the pump shaft; the outer circle of the angular contact ball bearing is fixedly connected with the bearing box; the outer circle of the bearing box is matched with the bearing body; the outer end of the bearing box collides with a lug boss arranged on the inner end face of the outer end cover; the inner end of the bearing box collides with the location bolt penetrating through the location thread hole in the inner end cover, and is fixed with the inner end cover through the location nut; the outer end cover is connected with the bearing body through the stud and the regulating nut and the fixed nut on the stud; and the inner end cover is fixedly connected with the bearing body through the fastening bolt, so that a clearance between a balance disk and a balance ring is enabled to be a set clearance, most of axial force is balanced, and the residual axial force is balanced through the angular contact ball bearing, thus solving the problem that the pump generates the failure caused by incapability of normal work of the balance disk due to factors such as the manufacturing quality of the pump, the liquid viscosity, the change of the axial force, the enlarged clearance caused by abrasion and the like.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to an axial force balance device for multistage centrifugal pumps. Background technique [0002] As we all know, a centrifugal pump is usually composed of an impeller, a pump body, a pump shaft, a balance disc, a balance ring and a stuffing box. More than two impellers and a balance disc are respectively set on the pump shaft and installed in the pump body. The water end and the water outlet end are respectively fixedly connected to the bearing body through cylindrical roller bearings. The outer end of the cylindrical roller bearing is in contact with the outer end cover, and the inner end is in contact with the inner end cover. The outer end cover passes through bolts and nuts. The hole on the bearing body is fixedly connected with the inner end cover. When working, the pump shaft is directly driven by the motor, and the liquid flows through each stage of impeller in turn...

AI Technical Summary

Problems solved by technology

[0005] A multi-stage centrifugal pump axial force balance device is provided with a pump shaft, a bearing body, an inner end cover and an outer end cover, and is characterized in that it is provided with an angular contact ball bearing, a bearing box, a positioning bolt, a positioning nut, and a set bolt , Adjusting studs, fixing nuts and adjusting nuts, the inner end cover is provided with positioning threaded holes, the inner circle of the angular contact ball bearing is fixedly connected with the water outlet end of the pump shaft, the outer circle is fixedly connected with the bearing box, and the outer circle of the bearing box is connected with the bearing body Matching, the outer end of the bearing box conflicts with the boss provided on the inner end surface of the outer end cover, and the inner end conflicts with the positioning bolt passing through the positioning threaded hole on the inner end cover, and is fixed with the inner end cover by the positioning nut. The outer end cover is connected to the bearing body through the adjusting stud, the adjusting nut and the fixing nut on the adjusting stud, and the inner end cover is fixedly connected to the bearing body through the set bolt, so that the gap between the balance plate and the balance ring is guaranteed to be within Set the gap to balance most of the axial force, and the remaining axial force is balanced by angular contact ball bearings, which solves the factors such as the manufacturing quality of the pump, the viscosity of the liquid, the change of the axial force, and the increase in the gap due to wear. Make the balance disc not work normally, thus causing the problem of pump failure

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