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在传统设计理论和结构模式的基础上,对比分析国内外现有安全阀结构,结合结构设计的特点,提出具有直动式结构和差动式结构的双级过载保护安全阀的设计思想,通过对双级过载保护安全阀差动式结构的建模及动态特性仿真分析,可以得出这种设计的新型安全阀满足设计要求,并且通过调整不同结构参数得到其对安全阀动态特性的影响:安全阀输出压力随弹簧刚度增加而增大,稳态调整时间减小;随差动面积减少而减小,稳态调整时间增大,出现等幅震荡;随进口横截面积增加而增大并呈发散;增大阻尼,动态响应特性提高.阀芯质量对安全阀输出压力影响不大,但振幅随其减小而减少.
Based on the traditional design theory and structure model, the safety valve structure at home and abroad is comparatively analyzed. Based on the characteristics of structural design, the design idea of double-stage overload protection safety valve with direct acting structure and differential structure is proposed. The simulation and analysis of the dynamic structure of the double-stage overload-relief safety valve can be concluded that the new safety valve of this design meets the design requirements and its influence on the dynamic characteristics of the safety valve can be obtained by adjusting different structural parameters: The output pressure of the safety valve increases with the increase of the spring stiffness and decreases the steady-state adjustment time. With the decrease of the differential area, the steady-state adjustment time increases and amplitude oscillation occurs. With the increase of the inlet cross-sectional area Showed divergence; increased damping, improved dynamic response characteristics of spool valve output pressure of little impact, but the amplitude decreases as it decreases.