共查询到20条相似文献,搜索用时 78 毫秒
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《现代制造技术与装备》2021,(2)
在工业实践中,旋启式止回阀的高压密封性一般都有所保障,但低压密封性常常被忽视,可能造成严重的异常工况。基于此,探讨旋启式止回阀的低压密封性原理、低压密封性被忽视的原因以及低压密封性的适用标准,以提升旋启式止回阀低压密封性的可靠性。 相似文献
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非能动压水堆核电厂在发生设计基准事故后的长期堆芯冷却依靠重力向堆芯注入冷却水,设置在注射管线上的旋启式止回阀需同时满足流量系数与开度以及入口流速与开度曲线要求。对传统旋启式止回阀的局部结构实施了优化设计,并对阀门在不同开度下的流通能力进行了试验研究,提供了旋启式止回阀在注射管线及类似工况的应用依据。 相似文献
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针对乙烯装置高温高压特殊工况的特点,对止回阀采用何种结构来满足系统要求展开讨论,通过对斜瓣式止回阀和通用的旋启式止回阀两种结构形式在流通能力、压差计算、阀门采用的结构特点等方面加以比较分析,并经过试验论证,详细描述了斜瓣式止回阀结构设计的关键要点。 相似文献
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基于Ansys对艇用止回阀抗冲击要求进行分析,求解了止回阀冲击应力结果,并对其进行评定。获得了止回阀抗冲击分析的常用方法,缩短了研发周期。 相似文献
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针对一种新型十字摆盘驱动式水液压轴向柱塞泵的配流阀系统结构参数与泵转速、柱塞直径不匹配导致的容积效率不足的问题,搭建了该新型泵的ADAMS-AMESim固液耦合仿真模型。在额定转速下,分析了配流阀阀芯质量、弹簧刚度、弹簧预紧力、阀芯球面直径对其容积效率的影响,并对其配流系统进行优化设计。结果表明:新型泵的容积效率随着配流阀弹簧刚度、预紧力的增加而增加,随着配流阀阀芯质量、阀芯球面直径的增加而减少,且吸液阀结构参数的变化对容积效率影响大于排液阀。因此,在设计新型泵的配流阀时可适当提高阀芯复位弹簧刚度和预紧力,适当减小阀芯质量和阀芯球面直径,以提高新型泵的容积效率。 相似文献
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摆动系统是混凝土泵送机械的核心单元之一,用于驱动分配阀的快速摆动。针对目前混凝土泵摆动慢、动作不到位、摆动冲击大等问题,通过运用理论和仿真分析,对摆动液压系统进行优化,有效降低压力损失,提高摆动驱动力,实现快速摆动;同时,针对快速摆动过程中的系统冲击问题,对摆动缓冲结构进行了分析和优化。结果表明,摆动系统压损降低28.5%,摆动速度提升20.8%,摆动冲击降低17.5%,各项性能相比原系统显著提升。 相似文献
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JIN Jiamei WANG Yin YANG Ying ZHANG Jianhui State Key Laboratory of Mechanics Control of Mechanical Structures Nanjing University of Aeronautics Astronautics Nanjing China Received September revised October accepted October published electronically October 《机械工程学报(英文版)》2011,(6):1130-1135
There are two kinds of piezoelectric pumps:check valve pumps and valve-less pumps.Whether to use a check valve or not depends upon the application occasion.To achieve large backpressure for higher flow rates,the pump with check valve is desirable.However,adding check valves implies more complex structure and higher probability of valve blocking,etc.In order to solve the problem,effective driving and transport mechanics with compact construction and reliable service are being sought.In this paper,using the second-order longitudinal vibration mode of a bar-shaped piezoelectric vibrator for driving fluid,a piezoelectric pump is successfully made.The proposed piezoelectric pump consists of coaxial cylindrical shells and a bar-shaped piezoelectric vibrator,which has a disk part and a cone part.The lead zirconium titanate ceramic rings fixed in the vibrator are polarized along the thickness direction.When the second-order longitudinal vibration of the vibrator along its axis is excited,the disk part of the vibrator changes periodically the volume of the chamber and the cone part acts as a pin valve,driving the fluid from the inlet port to the outlet port.Finite elements analysis on the proposed pump model is carried out to verify its operation principle and design by the commercial FEM software ANSYS.Components of the piezoelectric pump were manufactured,assembled,and tested for flow rate and backpressure to validate the concepts of the proposed pump and confirm the simulation results of modal and harmonic analyses.The test results show that the performance of the proposed piezoelectric pump is about 910 mL/min in flow rate with a highest pressure level of 1.5 kPa under 400 V peak-to-peak voltage and 51.7 kHz operating frequency.It is confirmed that this bar-shaped piezoelectric transducer can be effectively applied in fluid transferring mechanism of pump through this research. 相似文献