Mechanical sealing structure for centrifugal pump

Abstract

The invention discloses a mechanical sealing structure for a centrifugal pump. The mechanical sealing structure comprises a fixed ring, a movable ring, a mechanical sealing seat and a shaft sleeve, wherein the shaft sleeve is fixedly arranged on a pump shaft in a sleeving manner, a movable ring sealing seat allowing the movable ring to be limited in the movable ring sealing seat is arranged in the shaft sleeve in a sleeving manner, a gap of the mechanical sealing seat is arranged on the shaft sleeve in a sleeving manner, a fixed ring sealing seat allowing the fixed ring to be limited in the fixed ring sealing seat is arranged between the mechanical sealing seat and the shaft sleeve, an axial spring is arranged in the fixed ring sealing seat, and the spring enables the fixed ring to be abutted against the movable ring; radial positioning plates are arranged at the rear end of the mechanical sealing seat; a shaft head loop which is in axial and movable connection with the pump shaft is arranged on a shaft shoulder of the pump shaft in a sleeving manner. According to the mechanical sealing structure disclosed by the invention, a double end surface mechanical seal is changed into a single end surface mechanical seal, and a leakage problem caused by the fracture of a mechanical sealing friction pair is solved, influence of particle media on a movable ring sealing surface and a fixed ring sealing surface is reduced, the service cycle of the pump is prolonged, the expense of spare parts is reduced, and the repairing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mechanical seals, in particular to a mechanical seal structure for centrifugal pumps. Background technique [0002] In the production of hexamethylenediamine, the pressure of the reaction system is high, and the conveying medium is granular mixed reaction materials, which may easily cause mechanical seal leakage, pump noise and vibration damage to the conveying pump used for material reflux, once it occurs, it will directly cause The reaction materials will leak completely within 30 minutes, causing parking and major accidents, which will cause great hidden dangers to stable production and safety and environmental protection requirements. Traditionally designed double-end machine-sealed high-pressure centrifugal pumps are used in the conventional production of hexamethylenediamine, with internal flushing and external cooling flushing systems. In actual production, it is found that the original seal struc...

AI Technical Summary

Problems solved by technology

In actual production, it is found that the original seal structure of the mechanical seal is not suitable for the sealing form of the actual working condition. When the pump starts or stops, the front pair of the original double-face mechanical seal will crack or break; the material of the dynamic and static rings is not suitable for the mixed medium of particles. Faster wear and tear; the material of the mechanical seal O-ring is prone to dimensional changes, wear, and damage to the outer coating

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