共查询到20条相似文献,搜索用时 31 毫秒
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本文对空心金属O形环压扁试验数据进行了整理分析,在定义了O形环视弹性常数(E_0)后,建立了密封视比压(q)与O形环特性参数——弹性回弹量(Δ_0),压紧面宽度(b_0)以及法兰密封分离量(Δ_f)的定量关系。因而,知道O形环特性参数后,便可由曲线或关系式确定密封视比压,从而对密封性进行评定。同时对如何根据O形环压扁特性曲线选择其工作点以及在法兰密封设计中的应用也作了讨论。 相似文献
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为了解决实际工作中遇到的主给水泵4APA302PO非驱动端机械密封漏量偏大问题,从机械密封失效机理来看,机械密封的设计制造、检修质量、运行工况等方面异常均可导致机械密封漏量超标。建立原因分析图,对密封水设计流量、静环座密封圈溶胀导致静环卡涩、准确性以及机械密封安装螺栓孔铸造缺陷几个方面逐一分析,研究结果表明引起主给水泵非驱动端机械密封漏量超标的主要原因是机械密封安装螺栓孔铸造缺陷导致,机械密封定位偏差以及机械密封静环座密封圈溶胀导致静环卡涩,是造成机械密封漏量超标的次要原因。针对存在的问题进行了相关改进优化,主要从三方面进行改进,对机械密封安装螺栓孔铸造缺陷采用螺纹密封胶堵漏;对静环座密封圈材质进行变更,改善密封圈的溶胀性能,同时在非驱动端泵盖上钻排气孔,让泵盖密闭腔室内的油雾能够及时排出,避免油雾在静环座位置处冷凝形成油滴,防止静环座密封圈出现溶胀,从根本上消除密封圈溶胀导致静环卡涩造成密封漏量超标;对机械密封的定位进行测量,消除机械密封定位偏差造成的漏量超标,从根本上解决了该泵非驱动端机械密封漏量超标故障。 相似文献
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水平孔道“O”形环密封结构有限元接触分析 总被引:1,自引:0,他引:1
利用ABAQUS软件对研究堆水平实验孔道中异种材料法兰联接的密封结构进行了弹塑性接触计算.利用有限元分步加载技术,模拟了主螺栓预紧和加压过程,研究了主法兰的应力分布和结构的密封性能. .计算结果表明,在预紧状态和设计压力状态下,水平孔道中的异种材料法兰联接.双道"O"形环密封结构完全可以满足强度和密封要求. 相似文献
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为探究转子偏心率对核主泵转子密封激励力的影响,基于雷诺时均N-S方程和RNG k-ε湍流模型,选取平面密封、迷宫密封和螺旋密封3种口环结构方案,对核主泵口环间隙内部流动进行数值计算,得到口环间隙区域压力、泄漏量及其密封激励力的分布规律。结果表明,模型泵性能预测值和试验值较为吻合,扬程最大误差为4.78%。在转子无偏心时,相对于平面密封,采用螺旋密封方案时口环泄漏量显著降低93.1%,而密封激励力增加63%。偏心率为10%时,口环压力分布沿周向较为均匀;当偏心率为30%时,周向靠近偏心位置处,口环间隙内部产生带状压力突升区,相对于无偏心方案,平面密封的泄漏量显著降低43.6%,而密封激励力增大4.4倍,迷宫密封和螺旋密封方案可显著降低转子偏心产生的密封激励力,其中迷宫密封可显著降低55%;偏心率为50%时,口环间隙内部带状压力突升区域偏向高压侧。本数值预测方法为揭示偏心转子对核主泵口环密封激励力的影响提供理论依据。 相似文献
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介绍 Inconel 718合金“O”形环的主要制造工艺和在室温、高温下的力学性能以及回弹性能。通过验证试验和技术鉴定,研制的大型 O 形环在热动态试验中达到了完全密封、无泄漏水平。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(4):130-136
Reactor power frequency spectrum measurements at various power levels (0.2 W, 1 W, 5 W, 100 W, 500 W, 5 kW and 100 kW) were made with HTR** (swimming-pool type). A low frequency AC amplifier, a magnetic tape recorder, a frequency selective amplifier with twin-T filters, a multiplier, and an integrator were used. Speed-up and speed-down techniques of tape recorder were convenient for extending the frequency range of the analysis. The measured frequency spectrum of reactor noise determined the modulus of zero power transfer function, and indicated a prompt neutron mean life time of (7.58±1.58) × 10-5 sec based on an effective delayed neutron fraction of 0.0082. The calculations were made with a HIPAC-103 computer. At higher power, some resonance peaks were found in the low frequency region. The absolute value of reactor power obtained by noise analysis agreed within 3% with the power meter indication at the power below 5kW. 相似文献
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简述10MW研究堆堆芯热工水力设计的准则,设计基础和CTSA程序特点。经CTSA程序计算得:在正常运行、运行暂态和可预期事故工况下,燃料元件表面不会发生偏离泡核沸腾,元件芯块最高温度为114.95℃,小于设计限值400℃,在稳态额定工况下,堆内不会出现过冷沸腾;堆芯冷却剂平均流速3.2m/s小于临界流速,设计满足了有关安全准则要求,并为可预期的事故工况窗有足够的安全裕量。 相似文献
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Reactor core design of Gas Turbine High Temperature Reactor 300 总被引:2,自引:0,他引:2
Kazuhiko Kunitomi Shoji Katanishi Shoji Takada Xing Yan Nobumasa Tsuji 《Nuclear Engineering and Design》2004,230(1-3):349-366
Japan Atomic Energy Research Institute (JAERI) has been designing Japan’s original gas turbine high temperature reactor, Gas Turbine High Temperature Reactor 300 (GTHTR300). The greatly simplified design based on salient features of the High Temperature Gas-cooled Reactor (HTGR) with a closed helium gas turbine enables the GTHTR300 a highly efficient and economically competitive reactor to be deployed in early 2010s. Also, the GTHTR300 fully taking advantage of various experiences accumulated in design, construction and operation of the High Temperature Engineering Test Reactor (HTTR) and existing fossil fired gas turbine systems reduces technological development concerning a reactor system and electric generation system. Original design features of this system are the reactor core design based on a newly proposed refueling scheme named sandwich shuffling, conventional steel material usage for a reactor pressure vessel (RPV), an innovative coolant flow scheme and a horizontally installed gas turbine unit. The GTHTR300 can be continuously operated without the refueling for 2 years. Due to these salient features, the capital cost of the GTHTR300 is less than a target cost of 200,000 yen (1667 US$)/kW e, and the electric generation cost is close to a target cost of 4 yen (3.3 US cents)/kW h.
This paper describes the original design features focusing on the reactor core design and the in-core structure design, including the innovative coolant flow scheme for cooling the RPV. The present study is entrusted from the Ministry of Education, Culture, Sports, Science and Technology of Japan. 相似文献
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5MW低功率堆堆本体结构抗地震分析 总被引:1,自引:0,他引:1
用谱分析法分析了低功率堆堆本体抵御七度和八度地震的能力,并与实验相结合,讨论了基础对结构动力特性的影响。将基础考虑为弹性支撑,求出结构在实际状况下的响应。并用此结果校核了地脚螺栓的强度。最后评述了堆本体的抗地震能力。 相似文献
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