Gluing method of metal base and SiC sealing ring for mechanical seal

Abstract

The invention discloses a gluing method of a metal base and a SiC sealing ring for a mechanical seal. A gap is reserved in the radius direction of the sealing ring and the metal base; the sealing ringand the bottom face of the metal base are subjected to solidification gluing through a glue film EP72 at the high temperature of 90-120 DEG C for 1-4 h, and after cooling is conducted to achieve theindoor temperature, the gap in the radius direction is filled with E-120HP epoxy glue; and thus the problems of parallelism and airtightness of the sealing ring are solved. The planeness of the sealing ring of a sealing ring assembly is stable and free of deformation in a large temperature interval, accordingly, the mechanical motive seal works stably and normally in a leakage-free mode in the extremely-large temperature interval and is high in gluing strength, and the airtightness of a gluing seam is good.

Description

technical field [0001] The invention relates to the technical field of gluing and mechanical sealing, in particular to a gluing method of a metal base for mechanical sealing and a SiC sealing ring. Background technique [0002] Compared with flexible seals, mechanical dynamic seals have the advantages of low energy consumption, high mechanical efficiency, high reliability, safety, and long life. They are widely used in petrochemical, aerospace, nuclear power, light industry, ships and other fields. The connection technology of the base and the SiC sealing ring plays a pivotal role in the field of mechanical seals. There are many ways to connect the metal base and SiC sealing ring, including interference mounting, brazing, gluing, etc., among which gluing is one of the more important ones. Low requirements, good stability and other advantages, so cementation as an irreplaceable connection method is widely used in practical applications. [0003] The bonding of the metal bas...

AI Technical Summary

Problems solved by technology

[0003] The bonding of the metal base and the SiC sealing ring is generally completed at room temperature or at a certain temperature. Because the thermal expansion coefficient of the metal base and SiC is greatly different, when the mechanical seal needs to work in a large span temperature range , because the thermal expansion of the metal base and the SiC sealing ring are inconsistent, no matter the use of interference mounting, brazing or cementing, the SiC sealing ring will inevitably bear the additional stress caused by the expansion of the metal, which will cause the flatness of the sealing surface to change , eventually leading to the failure of the entire mechanical seal

Therefore, for the mechanical seal structure that needs to work in a large temperature range, it is necessary to find a reliable connection method, that is, to ensure the relative tightness between the metal base and the SiC seal ring, and to solve the problem of the thermal expansion coefficient mismatch between the two. However, the stress and deformation problems caused by the current public publications are less involved in the research on this problem, and there is still no reliable, stable and economical connection method to solve this problem.