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本文介绍了一种粘贴真空绝热板的方法。以聚氨酯发泡材料作为粘合剂,用喷涂发泡的方法作为施工工艺,利用聚氨酯材料发泡过程中特有的粘结性、流动性,无需非功能性辅助材料双面胶和热熔胶,就能够将真空绝热板粘贴在平面、弧面或凹凸不平的表面,并达到拓宽真空绝热板使用范围、提高使用效率、降低使用成本的目的。 相似文献
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尽管真空绝热板具有优异的热屏蔽性能,但是这种薄型、密闭的塑料板相对高的价格限制了其在电冰箱、绝热运输箱以及其他一些极具前途的市场中的应用。陶氏化学、杜邦及其他一些真空绝热板(VIP)制品的供应商推出的最新产品有望扩大VIP的市场渗透,从而使板材更易于加工、更有效、寿命更长。美国密西根州的陶氏化学公司的技术销售专家约翰·哈根介绍,我们经常听人们说真空板太贵,但是陶氏化学研制出的一系列绝热芯层材料可大大提高这种板材的经济性。哈根声称,这种材料是泡孔很小(20μm左右)的开孔聚苯乙烯泡沫塑料,在已经推出的所… 相似文献
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真空绝热板使冰箱重量更轻,体积更小,加之环保和高效节能的特性,受到冰箱行业的关注.在2017年中国家用电器技术大会冰箱/冷柜专业技术分会上,福建赛特新材股份有限公司研发部总监谢振刚介绍了一种更具节能效果的真空绝热板(VIP)——纳米膜真空绝热板. 相似文献
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对于嵌入式电烤箱来说,橱柜是否按要求开孔,直接影响烤箱的散热,继而影响电气性能以及正常工作。本文将根据国内较少开孔甚至不开孔与烤箱的温控器布置匹配方面进行了探索。 相似文献
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本文采用弹性厚壳理论及复变函数理论,对Reissner扁球壳开孔问题进行了分析研究,建立了求解厚壳开孔应力集中问题的复变函数解法。若同时采用映射变换,就为求解中厚扁球壳开任意形状孔的应力集中问题提供了一种规范而有效的方法。 相似文献
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本文介绍了利用真空理论对大型汽轮发电机水冷却回路排水的方法,并利用真空试验对发电机冷却回路密封性进行了评价和应用研究。 相似文献
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Yoshimitsu Niwa Kunio Yokokura Kosuke Sasage Hiromichi Somei 《IEEJ Transactions on Electrical and Electronic Engineering》2011,6(4):311-315
The vacuum arc characteristics and high current interruption ability of several different sized electrodes applied in the uniform vacuum arc control method named self arc diffusion by electrode (SADE) are presented. The arc behavior of the test electrode during the arcing period was observed by a high‐speed video camera. At extremely high interruption currents, the arc of the conventional axial magnetic field (AMF) electrode concentrates, causing local heating of the electrode. However, the arc of the SADE diffuses over the whole contact area thus avoiding local heating. The interruption ability of SADE is about twice as much as that of the conventional AMF for the same sized electrode. By applying this arc control method to vacuum circuit breaker (VCB), it can be made more compact and lighter than the conventional type. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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A high‐speed vacuum circuit breaker which forces the fault current to zero was investigated. The test circuit breaker consisted of a vacuum interrupter and a high‐frequency current source. A vacuum interrupter with an axial magnetic field electrode and a disk‐shaped electrode was tested. The arcing period of the high‐speed vacuum circuit breaker is much shorter than that of a conventional circuit breaker. The arc behavior of the test electrodes immediately after the contact separation was observed by a high‐speed video recorder. The relation between the current waveform just before the current zero point and the interruption ability was investigated experimentally by varying the high‐frequency current source. The results demonstrate the interruption ability and the arc behavior of the high‐speed vacuum circuit breaker. Effective current interruption is made possible by a low current period just before the current zero point, even though the arcing time is short and the arc is concentrated. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 172(2): 20–27, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20915 相似文献
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由于密封油罗茨真空泵、水环真空泵经长期运行性能变差,出力降低,使真空油箱长期在-70kPa的低真空以下运行,极大影响了氢气纯度;罗茨真空泵、水环真空泵故障逐渐频繁,设备可用率也在降低,为此,经过论证,将密封油真空系统与大机真空系统联通,这样,密封油系统真空泵组可长期停运,既可一定程度上节约厂用电,又可保证设备的稳定运行。 相似文献
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真空断路器的使用日益广泛 ,真空灭弧室作为断路器的核心部件 ,其内部气体压力是决定真空断路器工作性能的重要参数 ,笔者就真空灭弧室内部气体压力的测定方法和现场使用情况进行介绍 相似文献