一个汽车工程师的自留地
Single-stage Ammonia Refrigeration Cycle Single-stage refrigerator is a wide used refrigerator. It can be applied to produce ice, used as air conditioning, used for food refrigeration and industrial processes and so on. Single-stage refrigeration cycle is the refrigerant in the refrigeration system process to have four stage which are compressed, condensation, throttling, and evaporation. It will complete the […]
泄漏问题仍然是阻碍涡旋压缩机等涡旋机械发展的主要障碍之一。涡旋压缩机中主要有内、外泄漏两种形式。外泄漏影响排气量，降低了容积效率以及整机效率。涡旋压缩机的结构决定了其特殊的泄漏通道，为了开发安全高效的涡旋压缩机，需要从涡旋压缩机的结构特点出发，分析端面、结合面、间隙、径向和切向的泄漏特点，并相应的确定密封方法和结构形式，妥善解决泄漏问题。
无油润滑压缩由于具有压缩气体不被润滑油污染、节约大量润滑油、净化流程、简化设备、延长触媒的使用寿命、提高产品产量及质量等优点，而广泛应用于化工、国防、冶金、石油炼制、通讯、仪表、食品、医疗、纺织等部门。
Scroll compressor was created at 1905, by a French engineering Leon Creux. But as the technology of the period was not advanced to construct a working product, first practical scroll compressors did not appear on the market until 1980s. Since 1970s, the energy crisis and the appear of high precision CNC milling machine brings the […]
Scroll compressor was created at the beginning of 1900s. Due to the limitation of processing technology, there are no product before the 1970s. Now the scroll compressor is the major compressor used by air conditioning. However, there are still many technology shortages of oil-free scroll compressor. I find it hard to get the right equations for calculation […]
涡旋压缩机从20世纪初提出，此后由于加工技术的局限，一直到70年代才开始发展，而无油涡旋压缩机的技术出现更晚，由于其泄漏问题也限制了无油涡旋压缩机的发展。目前虽然涡旋压缩机已经占领了空调市场，无油涡旋压缩机技术仍然不够成熟，国内生产无油涡旋压缩机的厂家也不多。然而由于涡旋压缩机的众多优点，其发展的前景还是比较好的，不过目前对于涡旋压缩机的研究并不多见，这次做无油涡旋压缩机毕业设计就遇到了很多问题，设
涡旋压缩机最早诞生于1905年， 由法国工程师Leon Creux发明的，由于加工技术的局限性,80年代初才开始批量生产。70年代开始，由于能源危机的加剧和高精度数控铣床的出现，为涡旋机械的发展带来了机遇。
空气压缩机是一行业覆盖面非常广的通用设备，我国每年空气压缩机的总产量达500多亿人民币。而我国空压机行业生产水平一直处在较落后的水平，主要生产能力集中在传统的活塞式空压机，而近几年发展起来的螺杆式压缩机生产能力，也是以进口主机，整机国内组装的方式为主。
In electrical circuits, we use many resistances. You will see four or five ring printed on them. Despite of using multimeter, you have another choice to judge it. You can read the color of each ring and get the exact resistance. Each color, in these rings, stands a number. Here is a table show their […]
此文已在《广西轻工业》2009年12月刊发表，原文见刊物27页，版权所有，请勿转载，如有需要，请联系本人，邮箱zp1214#gmail.com。 作者：张鹏；曾狄根；黄学章（中南大学能源科学与工程学院，湖南长沙，410083） 【摘要】为研究半导体温差发电在工业余热利用中的可行性，设计了半导体温差发电测试实验装置，利用该实验装置测试了半导体温差发电器的输出特性、分析出了影响其输出特性的因素、计算了温差发电成本。实验结果表明，半导体温差发