共查询到20条相似文献,搜索用时 109 毫秒
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活塞发动机阀体有限元分析 总被引:4,自引:0,他引:4
以某型鱼雷活塞发动机配气阀阀体为例,利用软件I-DEAS和Marc,对阀体在复杂的位移、力和换热边界条件下的温度场和应力场进行了三维有限元分析。确定了阀体主要失效位置,表明了热应力为阀体的主要破坏因素,从而为改进阀体冷却设计提供参考。 相似文献
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小口径低压阀门的阀体与阀盖之间,均以螺纹连接为一体。控制阀体端面对阀体中心线之间的平行度误差(见图1),不仅能够保证阀体与阀盖之间的连接有较好的紧密性,以防止流动介质由此处泄漏;而且还保证阀盖的中心线与阀体的中心线重合或平行,从而改善了阀门的使用性能。本文介绍在机械加工过程中,采用有效的工艺手段,直接控制阀体端面对阀体中心线之间的平行度误差所采取的措施。 相似文献
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针对工程机械用多路阀阀口压损大、流速高,极易出现阀芯冲蚀磨损的问题,以某型号工程机械多路阀为例,设计不同组合形式的节流槽,研究多路阀阀口节流槽结构形式对阀口流阻损失及多路阀内部流场特征的影响。采用数值分析的方法研究了不同阀口节流槽形式在阀芯开启过程中阀口前后压差、流量、流速等流场特征。结果表明:阀芯采用不同组合型节流槽的流场特征明显不同,VU形节流槽较其他阀口出流线性特性更好,且具有良好的预升压效果,可进一步降低液流对阀芯的冲蚀,减小噪声、振动,保证多路阀工作的稳定性。对高压、大流量多路阀阀芯节流槽口的设计及提升多路阀综合性能具有一定的参考意义。 相似文献
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Measurment of fluid film thickness on the valve plate in oil hydraulic axial piston pumps (Part II: Spherical design effects) 总被引:1,自引:0,他引:1
Jiong-Ki Kim Hyoung-Eui Kim Yong-Bum Lee Jae-Youn Jung Seok-Hyung Oh 《Journal of Mechanical Science and Technology》2005,19(2):655-663
Tribologtcal characteristics in the sliding parts of oil hydraulic piston pumps are very important in increasing overall efficiency
In this study, the fluid film between the valve plate and the cylinder block was measured by using a gap sensor and the mercury-cell
slip ring unit under real working conditions To investigate the effect of the valve shape, we designed three valve plates
each having a different shape One of the valve plates was without bearing pad, another valve plate had bearing pad and the
last valve plate was a spherical valve plate It was noted that these three valve plates observed different aspects of the
fluid film characteristics between the cylinder block and the valve plate The leakage flow rates and the shaft torque were
also investigated in order to clarify the performance difference between these three types of valve plates From the results
of this study, we found that the spherical valve plate estimated good fluid film patterns and good performance more than the
other valve plates in oil hydraulic axial piston pumps 相似文献
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