Mechanical sealing device for shaft ends

Abstract

The invention provides a mechanical sealing device for shaft ends. The mechanical sealing device is arranged between an end cover assembly and a shaft sleeve assembly and comprises a main sealing assembly. A throttling sleeve assembly is arranged on the side, close to the medium side, of the main sealing assembly. A lip-piece sealing assembly used for sealing the shaft sleeve assembly is arrangedbetween the main sealing assembly and the throttling sleeve assembly and comprises a first lip piece fixedly arranged on the end cover assembly. The first lip piece bends and extends inwards and towards the throttling sleeve assembly, and sealing between the first lip piece and the shaft sleeve assembly is realized. When the mechanical sealing device is in a non-operating state, a process medium at the first lip piece applies axial force in a main sealing direction to the first lip piece, so that the sealing end face of the first lip piece has a tendency to move close to the shaft sleeve assembly, the airtightness between the first lip piece and the shaft sleeve assembly is improved, the process medium is prevented from moving back towards the main sealing assembly, and the operating stability and reliability of the mechanical sealing device are facilitated.

Description

technical field [0001] The invention belongs to the technical field of mechanical seals, and in particular relates to a shaft end mechanical seal device. Background technique [0002] With the continuous and rapid development of petrochemical, oil refining chemical, coal chemical, electric power, metallurgy, nuclear power and other industries, high requirements and high standards are put forward for the operation stability and reliability of the supporting rotating equipment such as machines, pumps and kettles; As a key basic component of rotating equipment, mechanical seals have increasingly stringent requirements, and they need to meet high reliability and long service life. [0003] For contact mechanical seals used in rotating equipment with special process media such as easy polymerization and crystallization, when the equipment is shut down and the switching pump is not running for a long time, the process medium will seriously pollute the working environment of the me...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the above-mentioned problems existing in the prior art, and provides a shaft end mechanical seal device. By setting a lip seal assembly that forms a seal with the shaft sleeve assembly, it is ensured that when the mechanical seal is in a non-operating state, the first lip It is sealed with the shaft sleeve assembly, which prevents the process medium from flowing back to the main seal, which is beneficial to the operation stability and reliability of the mechanical seal, and solves the problem that the process medium is easy to flow back and pollute the working environment of the main seal when the machine is stopped.

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