Stirrer mechanical seal pumping circulation device

Abstract

The invention provides a mechanical seal pumping circulation device for an agitator. The top of the sealing cavity is connected to the shaft sleeve through the air-side sealing core, the bottom of the sealing cavity is fixedly connected to the base, and the base and the shaft sleeve are connected through the medium-side sealing core. A liquid sealing cavity is formed, a stator is fixed on the sealing cavity, a rotor is fixed on the shaft sleeve, and the rotor is at a position opposite to the stator. The invention has good self-circulation ability, the sealing liquid is sucked in the axial direction, the influence of centrifugal force is ignored, the structure of the stator and the rotor has little agitation for the sealing liquid, the generated stirring heat is small, and the energy loss is low. The sealing liquid has good suction performance, uniform flow and pressure, stable operation, and no extra impact on the mechanical seal.

Description

technical field [0001] The invention belongs to the field of mechanical seals, in particular to a mechanical seal pumping circulation device for an agitator. Background technique [0002] In order to ensure the safety of equipment operation, the mechanical seal of the agitator usually adopts double-end wet mechanical seal. In this structure, in order to ensure the lubrication of the sealing end face, take away the heat generated by the rotation of the mechanical seal, and increase the life of the mechanical seal, sealing liquid must be provided in the sealing cavity formed by the double-end seal. The existing double-end mechanical seal flushing systems given in API682-2014 mainly include the following types: pressureless PLAN52 and PLAN55, and pressurized PLAN53 and PLAN54. Considering the cost and actual operation, the mechanical seal of the agitator generally adopts the flushing system of PLAN52 and PLAN53. With these two types of flushing systems, there is no external p...

AI Technical Summary

Problems solved by technology

[0003] At present, the common pumping ring uses the pumping principle of centrifugal force. Due to the influence of the speed, the pumping cycle capacity cannot be generated when the speed is low, and it is not suitable for low-speed agitators.

In the flushing scheme of PLAN 53A, the agitator basically does not use a pumping ring, and only relies on the thermosiphon effect to achieve the purpose of circulation. Service life of mechanical seal

[0004] The patent application numbers of 201310126752.8, 201420631884.6, and 201910331679.5 are based on the pumping principle of centrifugal force, which is limited by many factors, such as uneven flow and pressure, uneven heat taken away by the sealing liquid circulation, large fluctuations, and difficult to work. less efficient

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