Design and manufacturing method of high-pressure hydrogen contact self-tightening combined seal

Abstract

The invention discloses a design and manufacturing method of a high-pressure hydrogen contact self-tightening combined seal. The method comprises the steps that a self-tightening metal structure is designed; the self-tightening metal structure after structural design is subjected to mechanical machining; the surface of the self-tightening metal structure after mechanical machining is subjected togrinding and rolling treatment; deep cooling treatment is performed on the self-tightening metal structure subjected to grinding and rolling treatment on the surface; the self-tightening metal structure after deep cooling treatment is subjected to isothermal annealing treatment or circular annealing treatment; and metallographic structure inspection is performed on the self-tightening metal structure after isothermal annealing treatment or circular annealing treatment, if a martensitic structure is not found in the inspection, it is indicated that manufacturing of the self-tightening metal structure is completed, and if the martensitic structure is found in the inspection, the self-tightening metal structure after deep cooling treatment is subjected to isothermal annealing treatment or circular annealing treatment again. The design and manufacturing method not only improves the sealing reliability under complex working conditions such as pressure change, but also improves the tissue stability of the material that is the austenitic stainless steel and the anti-fatigue performance of the self-tightening metal structure.

Description

technical field [0001] The invention relates to the technical field of high-pressure sealing, in particular to a method for designing and manufacturing a high-pressure hydrogen-facing self-tightening combined seal. Background technique [0002] Hydrogen energy has the advantages of cleanliness, high efficiency, and renewability. It is regarded as an ideal energy source with great development potential, and it is one of the strategic energy development directions of mankind. In recent years, in order to cope with climate warming and reduce carbon dioxide emissions, many countries in the world have advocated the development of "hydrogen economy" and continued to promote the research and development and industrialization of hydrogen energy technology. my country also regards hydrogen energy as an important part of the new energy strategy and a new economic growth point, and is accelerating industrial development. The next few years will be a critical period for the constructio...

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Problems solved by technology

[0003] Existing related research and engineering applications have shown that the sealing problem is one of the main factors affecting the safety and reliability of hydrogen energy utilization equipment, which seriously restricts the pace of independent research and development towards practicality and industrialization

On the one hand, the sealing problem is due to the small molecule and low viscosity of hydrogen itself, which is prone to leakage and failure during production, transportation and storage; Performance degradation, which in turn can lead to failure of the sealing structure

When the hydrogen pressure changes repeatedly and the connecting parts are disassembled many times, it is easy to cause the sealing surface to wear out, and the forced sealing of the cone surface often causes leakage problems, and a good sealing effect cannot be achieved even if the tightening force is increased again afterwards; and under the combination of high pressure and hydrogen Under induction, austenitic stainless steel is prone to martensitic transformation and hydrogen embrittlement

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