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

A combination of sealing and manufacturing method technology, applied in the direction of manufacturing tools, mechanical equipment, passing components, etc., can solve problems such as hydrogen embrittlement, leakage failure, and forced sealing leakage of the cone surface, so as to improve hydrogen embrittlement resistance and fatigue resistance , the effect of improving the stability of the organization

Active Publication Date: 2021-11-12
HEFEI GENERAL MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Design and manufacture method of high-pressure hydrogen self-tightening combined seal
  • Design and manufacture method of high-pressure hydrogen self-tightening combined seal
  • Design and manufacture method of high-pressure hydrogen self-tightening combined seal

Examples

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Effect test

Embodiment 1

[0058] A method for designing and manufacturing a high-pressure hydrogen-facing self-tightening combined seal, comprising the following steps:

[0059] S1, performing structural design on the metal structure; the material of the self-tightening metal structure 20 is austenitic stainless steel.

[0060] S2, machining the metal structure after structural design.

[0061] S3. Grinding and rolling the surface of the metal structure after machining to ensure that different parts of the metal structure meet the requirements of surface roughness. For example, when the metal structure is in service under alternating and pulse loads, the surface roughness requirements.

[0062] At the same time, due to the inhomogeneity of the material composition of austenitic stainless steel, there will be a local area with few austenitic elements, which is the unstable area of ​​austenitic stainless steel. Deformation to induce martensitic transformation in the unstable region of austenitic stainl...

Embodiment 2

[0070] The overall connection structure of the high-pressure hydrogenation pipeline used in the hydrogenation station includes the following components: several sections of high-pressure hydrogenation pipelines, and sealing connectors for connecting the several sections of high-pressure hydrogenation pipelines in two phases.

[0071] The self-tightening metal structure 20 in this embodiment is a sealed connection between two sections of high-pressure hydrogen pipelines.

[0072] Depend on figure 2 As shown, the self-tightening metal structure 20 has a flat cylindrical shape as a whole, and both outer surfaces along the transmission direction of the high-pressure hydrogen pipeline are circular, and the diameters of the two outer surfaces are both d1, and the diameter d1 of the two outer surfaces is It is equal to the outer diameter d4 of the high-pressure hydrogen pipeline.

[0073] Depend on figure 2 with image 3 As shown, the self-tightening metal structure 20 is provid...

Embodiment 3

[0081] A method for designing and manufacturing a high-pressure hydrogen-facing self-tightening combined seal, comprising the following steps:

[0082] S1, carry out structural design on the self-tightening metal structure 20 in the second embodiment, the material of the self-tightening metal structure 20 in the second embodiment is austenitic stainless steel.

[0083] In step S1, the following steps are specifically included:

[0084] S11. Determine the service temperature and pressure of the self-tightening metal structure 20 according to the requirements of the hydrogen refueling station and according to the service temperature, pressure, specifications and other parameters of the high-pressure hydrogen pipeline.

[0085] S12, according to the service temperature and pressure of the self-tightening combined seal, select a rubber ring 40 of suitable material and size; wherein, the specific material of the rubber ring 40 can be selected from ethylene-propylene rubber, silicon...

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Abstract

The invention discloses a method for designing and manufacturing a high-pressure hydrogen-facing self-tightening combined seal, comprising: designing a self-tightening metal structure; machining the designed self-tightening metal structure; machining the self-tightening The surface of the metal structure is ground and rolled; the self-tightening metal structure after the surface is ground and rolled is subjected to cryogenic treatment; the self-tightening metal structure after the cryogenic treatment is subjected to isothermal annealing treatment or cyclic annealing treatment; The self-tightening metal structure after isothermal annealing or cyclic annealing is inspected for metallographic structure. If no martensitic structure is found in the inspection, it means that the manufacture of the self-tightening metal structure is completed; if the martensitic structure is found in the inspection, then Carry out isothermal annealing treatment or cyclic annealing treatment on the self-tightening metal structure after cryogenic treatment again. The invention not only improves the sealing reliability under complex working conditions such as pressure changes, but also improves the structural stability of the material, that is, the austenitic stainless steel and the fatigue resistance 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/04C21D7/04C21D1/26C21D1/34C21D1/42C21D9/00F16L15/04
CPCC21D1/26C21D1/34C21D1/42C21D6/04C21D7/04C21D9/0068C21D2211/001C21D2261/00F16L15/008Y02P10/25
Inventor 聂德福陈学东王冰范志超江勇薛吉林
Owner HEFEI GENERAL MACHINERY RES INST
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