共查询到20条相似文献,搜索用时 46 毫秒
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自封阀是航空液压、液冷和燃油等系统中必不可少的组成单元。针对目前自封阀类产品性能需求的提高,该文介绍一种钢针锁紧结构的自封阀,该自封阀具有体积小,重量轻,且操作轻便,对接迅速。 相似文献
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1 引言在液压系统中,由于结构上的需要,及拆装方便,常采用双向快速自封阀(快速接头)来解决快速拆装的关键问题。由于用户对这种液压元件的结构特性不甚了解,致使维修调整不佳,影响工作效率。本文介绍双向快速自封阀的结构特点和流量压力特性,以及使用、维修的调整方法,以供参考。 相似文献
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目前各油田普遍使用的抽油泵为管式抽油泵,其泵筒加工工艺较复杂,检修困难,检泵周期短.而自封式抽油泵克服了上述缺点,可采用各种规格的旧泵筒,活塞采用软弹性线性密封,依靠反向压力压缩密封套伸缩密封,提高了泵效和泵的使用周期,减少了检修作业工作量. 相似文献
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首先介绍了微阻缓闭止回阀的结构及作用,进而对易损部件阀瓣密封面损坏问题进行了研究,提出了对易损件阀瓣修复改造方法。实践证明改造方案可行,经济效益明显。 相似文献
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针对中大口径供水管路应用旋启式止回阀和单阀瓣蝶式缓冲止回阀存在的问题,根据水利学防止水锤发生的原理,介绍了双阀瓣蝶式缓冲止回阀设计计算,动作原理,结构特点,主要零部件的材料及其适用范围。 相似文献
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详细介绍了自封式压紧密封件的分类及在使用中如何根据实际工况选择密封件的材料、规格,阐述了自封式压紧密封件的特点和使用技巧,分析了在标准和非标准的条件下如何计算密封圈的压缩量. 相似文献
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徐森亮 《现代制造技术与装备》2010,(1):33-35
板料冲裁件通常需要经过落料、冲孔等冷冲压工艺加工。复合模作为多工序模,因能同时完成落料、冲孔等工序,所以应用广泛。本文通过"油封垫片"倒装式复合模具的典型结构设计,对倒装式复合模结构加以剖析。 相似文献
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The purpose of this paper is to propose the necessary sampling techniques for estimating a global parameter defined in a solid opaque specimen (e.g. the total volume of mitochondria in a given liver, the total capillary surface area in a given lung, etc.). The geometry of the specimen often suggests a multi-level or cascade sampling design at different magnifications, whereby the object phase at one level becomes the reference phase in the next level. The final parameter is then estimated as the product of the intermediate ratios with the volume of the specimen, which is estimated independently. Each level can be regarded as an independent sampling design; a given stereological project may be planned in terms of one or more of these designs. Our development is a blend of practical experience and recent theoretical advances on sampling for stereology with well-known sampling techniques previously developed with different purposes in mind. 相似文献
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J D Harry 《Medical instrumentation》1987,21(5):278-282
A surge in quantitative muscle physiology began with the mid-nineteenth century introduction of a new instrument capable of measuring contraction events with millisecond resolution. This strictly mechanical device, called a "myograph" by its designer Hermann von Helmholtz, was based on existing technology but included several important innovations that made it suitable for recording accurately the high speed events of muscle contraction. A variety of different myograph designs, each with its own advantages and disadvantages, ultimately came into existence and populated muscle physiology laboratories into the twentieth century. 相似文献
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V. V. Burenin 《Russian Engineering Research》2008,28(10):1030-1033
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通过研究ASME、ISO等国际标准对安全阀动作性能试验和排量试验的内容和方法,阐述了建立安全阀试验台基本的相匹配参数和必要性。 相似文献