真空预冷过程中真空泵的延迟开启现象研究  

Study on the Delayed-opening of Vacuum Pump in the Vacuum Pre-cooling Process

作　　者：宋晓燕[1] 刘宝林[1] 闫静文[1] 

机构地区：[1]上海理工大学低温生物与食品冷冻研究所,上海200093

出　　处：《制冷学报》2011年第2期45-49,共5页Journal of Refrigeration

基　　金：上海市重点学科建设项目(S30503)资助~~

摘　　要：VCE-15型真空预冷机在自动预冷模式下,由于受到真空室空气状态的影响,真空泵的开启存在延迟现象,导致真空预冷周期增长。以捕水器的冷负荷为基础,推导出真空泵的延迟开启时间计算式,并利用实验数据验证。结果表明:真空泵的延迟开启时间一般在5分钟之内,时间长短随着真空室空气的起始温度、相对湿度及真空室空载率的增加而增加,随着制冷机组制冷量的增加而缩短。复压时使外部空气经捕水器冷却后再进入真空室,或者提高制冷机组的制冷量,均可以缩短下次真空泵的延迟开启时间。ince VCE-15 vacuum pre-cooling machine can be influenced by the air conditions in the vacuum chamber,the opening-time of vacuum is delayed,resulting in the prolonging of cooling period.Based on the cooling load,the computational formula for delayed-opening time was deduced,and verified by the experimental results.It is shown that,the delayed-opening time is usually less than 5 minutes,prolongs with the increase of temperature,relative humidity or no load ratio in the vacuum chamber,and shortens with the increase of refrigerating capacity of refrigerating unit.The delayed-opening time can be shorten effectively,through cooling the outside air by water catcher before entering vacuum chamber or increasing the refrigerating capacity of refrigerating unit.

关 键 词：热工学 真空泵 延迟开启 真空预冷 

分 类 号：TS205.7[轻工技术与工程—食品科学] TB69[轻工技术与工程—食品科学与工程]