共查询到19条相似文献,搜索用时 78 毫秒
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介绍3200m~3/h空分设备明杆式低温角式截止阀整体件螺套存在的问题,设计出新型的组合件螺套代替原整体件,缩短了处理故障的时间,避免了珠光砂喷出,操作灵敏可靠。图1。 相似文献
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低温液体储运设备的绝热设计 总被引:1,自引:0,他引:1
通过合理设计整体支撑结构,对造成漏热的几条主要途径加以控制.以30 m3液氧储槽为例,用近似的理论计算做绝热设计,得出该储槽漏热小于按国家标准液氧蒸发率计算允许值的结论. 相似文献
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从烟道阀门普遍存在漏风情况着手,减少漏风率,降低工程成本,维护更安全方面进行了较为深入的分析,研究结果表明:(1)减少至1%,(2)成本降低了,同时解决了大型烟道和特大型烟道的密封难题,(3)通过设置在每单台除尘器进出口的该种阀门实现在线单通道切换检修,甚至具备在线更换全部滤袋的能力。 相似文献
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In this paper an investigation is reported on Siemens-power-metal-oxide-semiconductor (SIPMOS) transistors of both p and n channel types, for their suitability for cryogenic applications. The drain characteristics, temperature dependence of Rds(on) and switching behaviour have been studied in the temperature range 4.2 – 300 K in BSS91 and BSS92 MOSFETs. The experiments reveal that these types of power transistors are well suited for operations down to ≈ 30 K. However, below 30 K the operating characteristics make them unsuitable for application. This arises because of carrier freeze-out in the n− region on the substrate, which forms a drain. 相似文献
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This paper describes the development of a check valve for use in a sorption compressor that will drive a 10 mW 4.5 K Joule-Thomson cryocooler. For the check valve extremely low backflow rates are tolerable at an operating temperature of the valve of 50 K. To fulfill these requirements, the sealing mechanism of the valve is based on a full metal to metal contact. In order to obtain sufficiently low leak rates, both parts were machined to a surface flatness in the order of 100 nm. In addition, the closing plate (boss) of the valve deforms (bends) slightly under pressure, forming itself to the opposite valve seat and thus reducing the gap between these parts. The measured leak flow at 50 K was 1.6 μg/s helium @ 16 bar pressure difference, which is well below the aim of 3 μg/s.The valve was subjected to an accelerated lifetime test of 300,000 cycles. It was observed that the leak flow through the valve during this test steadily decreased to a level of 0.15 μg/s after 100,000 cycles. 相似文献
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本文针对仅通过热泵系统加热的空气源热泵热水器水箱,通过对温度/压力阀的使用环境分析,结合热泵加热的自身特点,提出该类产品内胆超压保护不同于电热水器,可以用普通的安全阀进行替代。 相似文献
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目的研究塑料薄膜热封工艺中热封参数之间的非线性关系,建立一种可用于自动包装机热封过程的数学模型。方法通过实验采集样本数据,并用附加动量法训练BP神经网络,建立热封参数之间的非线性数学模型,最后通过神经网络预测热封时间,并采用插值算法建立目标热封强度下热封温度和热封时间之间的多项式数学模型。结果通过插值算法与神经网络的结合运用,较为精确地描述了热封温度和热封时间之间的数学关系,插值函数实现了神经网络模型的简化,两者误差较小。结论通过文中方法确定了包装材料热封参数之间的非线性关系,将其用于热封包装设备,可提高设备的智能化程度。 相似文献