A contact type mechanical seal static ring assembly and assembly method

Abstract

The invention provides a contact type mechanical seal stationary ring assembly and an assembling method. The stationary ring assembly comprises a stationary ring body and an end cover located at the back end of the stationary ring body; the front end face of the stationary ring body is a sealing end face, the stationary ring body is at least provided with one cavity with an opening in the back end, and the end cover is used for sealing the cavity; and a capillary core material and a condensing agent are arranged in the cavity. Heat is absorbed in the process that a condensing agent is gasified in a high-temperature region close to the sealing end face, the temperature at the position, close to the sealing end face, in the cavity drops, and the temperature of the sealing end face further drops; and heat is discharged in the process that the condensing agent is condensed to be in the liquid state in a low-temperature region. In this way, according to the heat pipe principle, the difference of the temperature in the cavity is used, and a phase change cycle of the condensing agent from the liquid state to the gas state to the liquid state is formed, so that a large amount of heat at the position of the sealing end face is rapidly brought away, the heat stress and the heat deformation at the sealing end face are reduced, the sealing stability is improved, and the service life of the contact type mechanical seal stationary ring assembly is prolonged.

Description

technical field [0001] The invention belongs to the technical field of mechanical seals, and specifically relates to a static ring assembly of a contact mechanical seal suitable for special working conditions (such as high pressure, high speed, high temperature, large shaft diameter, etc.) and an assembly method of the static ring assembly . Background technique [0002] Mechanical seals are widely used in petroleum, chemical, aviation and other fields, and are mainly used for shaft end seals of centrifugal pumps in these fields. Mechanical seals can generally be divided into two types: non-contact and contact seals. In recent years, the non-contact mechanical seal has developed rapidly, but because the sealing end face is non-contact, resulting in relatively large leakage, so some occasions with high requirements still need to use the contact mechanical seal, and the application of the contact mechanical seal The range is wide. [0003] Contact mechanical seals used for ...

AI Technical Summary

Problems solved by technology

[0003] Contact mechanical seals used for special working conditions (such as high pressure, high speed, high temperature, large shaft diameter, etc.). The temperature rise will generate a large thermal stress, which will easily cause thermal deformation of the sealing end face, and even radial cracks on the sealing end face and material bonding transfer, resulting in increased wear and leakage; the dynamic and static ring sealing end faces are in mixed friction State, there is a small amount of fluid between the sealing end faces, which is prone to vaporization at high temperature, sometimes accompanied by a loud steaming sound, and may cause the sealing ring to break; in addition, the excessive heat generated between the sealing end faces may easily cause O-shaped rubber Ring hardening and cracking

The above problems are likely to cause seal failure and reduce the seal life

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