论文部分内容阅读
针对钻井泵泵阀使用寿命短且更换次数频繁,严重制约着钻井泵向高压、高冲次及大排量方向发展的现状,构造出泵阀冲击过程的动力学模型,采用ANSYS/LS-DYNA有限元软件对不同橡胶圈伸出厚度、阀体锥角及阀座类型泵阀的冲击特性进行了动态仿真分析。研究表明:全开型泵阀最大等效应力值为706.42 MPa,该应力循环作用于阀体上,使其极易产生变形,甚至发生断裂,这和钻井现场泵阀断裂失效现象相符;当伸出厚度取0.5 mm左右时,泵阀具有较良好的冲击性能;当阀体锥角取60°时,阀体最大等效应力值最小;当阀体锥角取55°时,阀座最大等效应力值最小;三筋阀座的泵阀冲击性能最差;四筋阀座的泵阀相对于全开型泵阀能较大地减小阀体的最大等效应力。研究结果对泵阀结构设计具有一定的参考意义。
In view of the short service life and frequent replacement of the drilling pump valve, which seriously restricts the development of the drilling pump toward high pressure, high impact and large displacement, the dynamic model of the impact process of the pump valve is constructed. The ANSYS / LS-DYNA Finite element software dynamic simulation analysis of different thickness of the rubber ring, valve cone angle and the valve seat of the impact characteristics of the valve. The results show that the maximum equivalent stress of the full-open pump valve is 706.42 MPa, and the stress acts on the valve body to make it prone to deformation and even rupture, which agrees with the rupture failure phenomenon of the pump valve on the drilling site. When the thickness is about 0.5 mm, the pump valve has better impact performance. When the cone angle of the valve body is 60 °, the maximum equivalent stress value of the valve body is the smallest. When the cone angle of the valve body is taken as 55 °, the valve seat is the largest The effective stress value is the smallest; the valve seat of the three ribs has the worst impact performance of the valve; the valve of the four ribs seat can greatly reduce the maximum equivalent stress of the valve body relative to the fully open type valve. The research results have certain reference meaning to the design of pump valve structure.