阅读说明：本技术 一种高压临氢自紧式组合密封件设计制造方法 (Design and manufacturing method of high-pressure hydrogen-contacting self-tightening combined sealing element ) 是由 聂德福 陈学东 王冰 范志超 江勇 薛吉林 于 2020-04-10 设计创作，主要内容包括：本发明公开了一种高压临氢自紧式组合密封件设计制造方法,包括：设计自紧式金属结构；对结构设计后的自紧式金属结构进行机械加工；对机械加工后的自紧式金属结构的表面进行研磨和滚压处理；对表面经研磨和滚压处理后的自紧式金属结构进行深冷处理；对深冷处理后的自紧式金属结构进行等温退火处理或循环退火处理；对等温退火处理或循环退火处理后的自紧式金属结构进行金相组织检验,若检验未发现马氏体组织,则表示完成该自紧式金属结构的制造；若检验发现马氏体组织,则重新对深冷处理后的自紧式金属结构进行等温退火处理或循环退火处理。本发明不仅提高了压力变化等复杂工况下的密封可靠性,而且提高了材料即奥氏体不锈钢的组织稳定性和自紧式金属结构的抗疲劳性能。(The invention discloses a design and manufacturing method of a high-pressure hydrogen-contacting self-tightening combined sealing element, which comprises the following steps: designing a self-tightening metal structure; machining the self-tightening metal structure after the structure design; grinding and rolling the surface of the self-tightening metal structure after machining; carrying out cryogenic treatment on the self-tightening metal structure with the surface subjected to grinding and rolling treatment; carrying out isothermal annealing treatment or circulating annealing treatment on the self-tightening metal structure subjected to the cryogenic treatment; carrying out metallographic structure inspection on the self-tightening metal structure after isothermal annealing treatment or circulating annealing treatment, and finishing the manufacturing of the self-tightening metal structure if no martensite structure is found in the inspection; and if the martensite structure is detected, carrying out isothermal annealing treatment or circulating annealing treatment on the self-tightening metal structure subjected to the cryogenic treatment again. The invention not only improves the sealing reliability under complex working conditions such as pressure change, but also improves the structural stability of the material, namely the austenitic stainless steel and the fatigue resistance of the self-tightening metal structure.)

1. A design and manufacturing method of a high-pressure hydrogen-contacting self-tightening combined sealing element is characterized by comprising the following steps:

s1, optimally designing a metal structure;

s2, machining the metal structure after the optimized design;

s3, grinding and rolling the machined metal structure surface;

s4, carrying out cryogenic treatment on the metal structure with the ground and rolled surface;

s5, carrying out isothermal annealing treatment or circulating annealing treatment on the metal structure subjected to cryogenic treatment;

s6, carrying out metallographic structure inspection on the metal structure after the isothermal annealing treatment or the circulating annealing treatment, and if no martensite structure is found in the inspection, finishing the manufacturing of the metal structure; and if the martensite structure is detected, carrying out isothermal annealing treatment or circulating annealing treatment on the metal structure subjected to the cryogenic treatment again until the martensite structure is not detected.

2. The method of claim 1, wherein the metallic structure is made of austenitic stainless steel.

3. The method for designing and manufacturing a high pressure hydrogen self-tightening combined sealing member according to claim 1 or 2, wherein in step S2, the high pressure hydrogen self-tightening combined sealing member is cryogenically treated by using liquid nitrogen or a refrigerator.

4. The method for designing and manufacturing a high pressure hydrogen self-tightening combination seal member according to claim 1 or 2, wherein in step S3, isothermal annealing or cyclic annealing is performed by means of resistance heating or induction heating.

5. A method of designing and manufacturing a high pressure hydrogen self-tightening combination seal according to claim 1 or 2, characterized in that the self-tightening combination seal comprises a self-tightening metal structure (20); the self-tightening metal structure (20) is a sealing connecting piece between two sections of high-pressure hydrogen pipelines;

the self-tightening metal structure (20) is a cavity structure, first openings (201) are formed in the two sides of the self-tightening metal structure (20) along the transmission direction of the high-pressure hydrogen pipeline, a second opening (101) is formed in the end portion of the high-pressure hydrogen pipeline, and the second opening (101) formed in the end portion of the high-pressure hydrogen pipeline corresponds to and is communicated with the first openings (201) formed in the two sides of the self-tightening metal structure (20);

the self-tightening metal structure (20) is characterized in that concave surfaces (203) are arranged on the outer walls of the two sides of the self-tightening metal structure (20) along the transmission direction of the high-pressure hydrogen pipeline, the concave surfaces (203) are the outer wall surfaces of the inner cavity (204) of the self-tightening metal structure (20), and the concave surfaces (203) are sealing surfaces which are attached to the high-pressure hydrogen pipeline when the inner cavity (204) of the self-tightening metal structure (20) is filled with high-pressure hydrogen.

6. The design and manufacture method of the high pressure hydrogen self-tightening combined sealing element according to claim 5, characterized in that the self-tightening metal structure (20) is provided with an annular groove (202) on the outer wall of the two sides along the transmission direction of the high pressure hydrogen pipeline, and the rubber ring (40) is arranged in the annular groove (202); the rubber ring (40) is arranged on the outer walls of two sides of the self-tightening metal structure (20) along the transmission direction of the high-pressure hydrogen pipeline and is clamped between the high-pressure hydrogen pipeline and the self-tightening metal structure (20).

7. The method of claim 6, wherein the recessed surfaces (203) on the outer walls of the self-clinching metal structure (20) are located between an annular groove (202) and a first opening (201), and the first opening is located in the annular groove (202).

8. The method of claim 5, wherein the self-energizing composite seal further comprises a fastener (30); the fastener (30) is arranged outside the self-tightening metal structure (20); the self-tightening metal structure (20) is in a flat cylindrical shape; the self-tightening metal structure (20) and the fastener (30) are cylindrical as a whole; the fastener (30) is used for fixedly connecting two adjacent sections of high-pressure hydrogen pipelines, and the high-pressure hydrogen pipelines are in threaded connection with the fastener (30).

9. The method for designing and manufacturing a high-pressure hydrogen-tightening combined seal element according to claim 6, wherein in the method for manufacturing the self-tightening metal structure (20), in step S1, the step of structurally designing the self-tightening metal structure (20) specifically comprises the following steps:

s11, determining the service temperature and pressure of the self-tightening metal structure (20) according to the requirements of the hydrogenation station and the service temperature, pressure and specification of the high-pressure hydrogen pipeline;

s12, selecting a rubber ring (40) with a proper material and size according to the service temperature and pressure of the self-tightening metal structure (20);

s13, digitally designing a self-clinching metal structure (20), comprising: the sealing surface contacted with the high-pressure hydrogen pipeline is the structural design of a concave surface (203), and the structural design of an annular groove (202);

s14, stress analysis is carried out on the self-tightening metal structure (20) by using finite element software, and the local stress concentration area (70) and the concave surface (203) of the self-tightening metal structure (20) are optimized and improved according to the analysis result; the local stress concentration area (70) is positioned at the first openings (201) on two sides of the self-tightening metal structure (20) along the transmission direction of the high-pressure hydrogen pipeline;

comparing the maximum equivalent stress obtained by analysis with the mechanical property data of the metal material used by the self-tightening metal structure (20); if the obtained maximum equivalent stress is less than the mechanical property data of the used metal material, namely the static strength and fatigue strength check meet the requirements, the structural design of the self-tightening metal structure (20) is completed; if the obtained maximum equivalent stress is larger than or equal to the mechanical property data of the used metal material, carrying out structural design on the self-tightening metal structure (20) again;

in step S3, the recessed surface (203) and the annular groove (202) of the machined self-clinching metal structure (20) are ground and rolled.