Graphite metal reinforced gasket suitable for inner and outer dual layer seal and method

Abstract

The invention belongs to the field of particular seal gaskets, and particularly relates to a graphite metal reinforced gasket suitable for inner and outer dual layer seal and a method. The gasket comprises a metal outer ring, a metal middle ring, a metal inner ring, a trapezoidal graphite inner ring and a trapezoidal graphite outer ring, the metal outer ring and the metal middle ring are connectedthrough the trapezoidal graphite outer ring, the metal middle ring and the metal inner ring are connected through the trapezoidal graphite inner ring, for a novel integrated dual-layer graphite metalreinforcing seal gasket, a stainless steel metal ring is used for wrapping two layers of graphite gaskets, a groove is formed in the inner side face of a metal ring, meanwhile, lapping shoulders on the two sides of a graphite body are clamped in the inner side groove of the metal ring, meanwhile, a pressure through hole is formed in the stainless steel metal ring to connect upper and lower seal faces to release a leaked detection pipe, and the problem that the medium pressure injection box seal frequently fails can be solved.

Description

technical field [0001] The invention belongs to the field of special sealing gaskets, and in particular relates to a graphite metal reinforcing gasket suitable for inner and outer double-layer sealing and a method thereof. Background technique [0002] Due to the need for sealing safety and leakage monitoring, many devices now adopt an inner and outer double-layer seal structure, and a leak detection tube is installed between the inner and outer double-layer seals to monitor the seal. This structure can not only improve the sealing reliability, At the same time, after the seal of the inner ring fails, the leakage can be captured by the leakage detection tube at the first time, and the leakage information will be transmitted, leaving enough time for the treatment of the leakage. [0003] Prior to this, metal ring gasket seals were the most widely used technology on major equipment. The metal ring seal has the following advantages: high temperature resistance: the metal ring ...

AI Technical Summary

Problems solved by technology

Therefore, metal ring seals are widely used in the defense industry and aerospace and other fields, but the same metal ring seals also have the following disadvantages: poor resilience: the rebound of metal O-rings depends on the elastic properties of the material itself, and the elastic range of the material 1. The elastic modulus is related to Poisson's ratio. Because the elastic range of metal materials is small, the rebound value of metal rings is generally small and difficult to measure; poor relaxation resistance: stress relaxation is an inherent characteristic of the material and cannot be avoided. Metal O Because of its poor resilience, the ring itself needs a high stress value for its own compression, so the anti-relaxation ability is very poor; the self-tightening ability is poor: the self-tightening ability is an important characteristic of the gasket, and the metal O-ring also has theoretically. A certain self-tightening ability, but because the metal O-ring itself has high strength and strong pressure capacity, it needs a high internal pressure to cause its proper deformation, so the self-tightening ability can only be reflected in a very high-pressure environment

But flexible graphite itself also has its disadvantages: poor mechanical properties, poor material plasticity

[0007] However, with the long-term use of the medium-pressure safety injection tank, it was found that the sealing failure of the inner gasket frequently occurred

According to the analysis, after the manhole flange is assembled, when it is used for a long time, due to the influence of factors such as the relaxation of the bolts, the fluctuation of temperature and pressure, and the creep of the ring body itself, the sealing failure of the local ring body is caused, and the ring body itself is damaged. Inherent defects make it impossible to repair these failed parts by springback, self-tightening, etc., resulting in seal failure

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