Seals for rotating machinery

Abstract

The invention relates to a sealing device for a rotary machine. The rotary machine comprises a machine body and a rotating shaft. The sealing device comprises a fixed portion and a rotating portion, wherein the fixed portion comprises an end cover fixed to the machine body, and a fixed ring assembled on the end cover; the rotating portion comprises a moving ring which is mounted on the rotating shaft and can rotate along with the rotating shaft; the moving ring and the fixed ring are matched to form a rotary sealing pair; the fixed ring and the end cover are connected through a stop pin; and the shear breaking strength of the stop pin is greater than rated driving force of the rotary machine but lower than maximum allowable driving force of the rotary machine.

Description

technical field [0001] The invention relates to a sealing device, in particular to a sealing device for a rotary machine. Background technique [0002] The mechanical seal is a shaft seal device of a rotating machine. It mainly relies on the preloading of the elastic element on the dynamic and static ring end face seal pairs and the compression of the medium pressure and the pressure of the elastic element to achieve sealing, thereby preventing the fluid medium in the equipment from passing through the shaft. Circumferential clearance leakage between equipment and equipment. There are many types of shaft seals, but because mechanical seals have the advantages of less leakage and long life, mechanical seals are widely used in the sealing of rotating shafts. [0003] However, there are still some problems in the application process of the mechanical seal device in the prior art. For example, general mechanical seals have no protective measures. During the working process, th...

AI Technical Summary

Problems solved by technology

Although it solves the problem of thermal expansion and contraction caused by temperature changes, which leads to seal failure

However, the cooperation between the sealed moving ring piece and the moving ring seat requires a sealing function, which requires high processing and assembly technology.

Moreover, the structure of the static ring is more complicated, and the processing and assembly process is more difficult

There is no automatic compensation function for the sealing pair, resulting in a high matching accuracy between the static and dynamic rings

There is also no protection designed to prevent damage to the prime mover due to adhesive wear failure of the mechanical seal

Images