毕业论文（设计）10L-10℃低温冷却液循环器设计.docVIP

I 10L/-10℃低温冷却液循环器 摘 要 低温冷却液循环泵又称低温箱，它有一个小型化的，独立的制冷系统和载冷剂循环系统两部分组成。其中，制冷系统采用蒸汽压缩式制冷，使制冷剂发生气液相变，吸收载冷剂氯化钙(CaCl2)水溶液所放出的热量。载冷剂由于被冷却使其温度降低，利用其低温来对一些实验用品进行保温和降温。根据设计的不同，温度能达到不同的要求。 本设计主要关注的是制冷剂的选择和制冷系统中各部件的设计及选取。由于现如今“温室效应”和臭氧层破坏等环境问题的日益严重，采用环保型制冷剂已是迫在眉睫，本文中选取R407C 作为制冷剂。制冷器件的选择包括全封闭活塞式压缩机的选型与校核，风冷冷凝器的设计，套管式蒸发器的设计，热力膨胀阀的选型以及其他辅助设备的选取等。 关键词：低温冷却/制冷技术/热力计算/蒸发器/冷凝器 II PAGE \* MERGEFORMAT PAGE \* MERGEFORMAT 38 10L/-10℃ Low-temperature cooling liquid circulating pump ABSTRACT Low-temperature cooling liquid circulating pump is similar to a low-temperature box,It contains two parts that are a smaller ,independent refrigeration system and a cooling agent circulatory system. Among this device, refrigeration system makes use of vapor compression refrigeration, the system makes the refrigerant change from gas to liquid ,and the refrigerant absorps energy that are released by the containing cooling agent (CaCl2). So the containing cooling agent’s temperature was cooled by the refrigeration. Now wo can make use of the lower temperature to cool some experiments or suffer the cooling energy from losing. According to the design of different requirements,we can achieve different temperature. During this design ,I think that the main concern are the choice of refrigerant and cooling systems and the various parts of the cooling systems. However, as a result of the “greenhouse effect” and ozone depletion, more and more poople put theirs attention to the serious environmental problems, so it is imminent to make use of the environment-friendly refrigerant. In the paper I select R407C as a refrigerant. Besides,The choice of refrigeration devices included closed-piston compressor, design of air-cooled condenser, casing-evaporator designing, the selection of thermal expansion valve and other auxiliary equipments. KEYWORDS:Cryogenic/cooling/Refrigeration/technology/Thermodynamic calculation Evaporator/Condenser PAGE \* MERGEFORMAT PAGE \* MERGEFORMAT 33 1. 绪论 1.1 低温冷却