CAJ | 학술논문

针选用先进的现代普莱克斯基于液氮制冷单元，通过独有的气液分离器设计，利用射频导纳料位开关的触点控制低温电磁阀的开启，及时排出输送至低温老化房的液氮在传送过程中汽化产生的废气，确保冷却介质的状态为纯净液体输送至老化房，以确保制冷效果。结果表明采用该制冷系统的老化房，可扩展一般老化箱的低温下限（－70℃），使低温可达－196℃，且具有制冷容积大，制冷能力强、效果好，可靠性高，运行及维护成本低等特点。
침선용선진적현대보래극사기우액담제랭단원，통과독유적기액분리기설계，이용사빈도납료위개관적촉점공제저온전자벌적개계，급시배출수송지저온노화방적액담재전송과정중기화산생적폐기，학보냉각개질적상태위순정액체수송지노화방，이학보제랭효과。결과표명채용해제랭계통적노화방，가확전일반노화상적저온하한（－70℃），사저온가체－196℃，차구유제랭용적대，제랭능력강、효과호，가고성고，운행급유호성본저등특점。
Aiming at the specific requirements of ultra low temperature , a set of low temperature aging room system for elec-tronic products based on liquid nitrogen is studied , which adopts modern advanced liquid nitrogen refrigeration unit based on Praxair.Compared with the traditional liquid nitrogen refrigeration system , the cooling efficiency of new system can reach 98%,while the traditional efficiency is 67%, by saving 30%of the liquid nitrogen consumption .Its unique gas-liq-uid separator design and the using of RF admittance level switch contacts can control the opening of low temperature sole -noid valve and timely discharge the waste gas produced during the transfer process , which can ensure the pure liquid cool-ing medium transferred into the aging room , therefore , to ensure the refrigeration effect .By using the low temperature aging room system based on this refrigeration system , the low temperature limit (-70℃) of the general degradation box can be extended , for the extreme low temperature can reach -196℃.The traits of system can be displayed as large refrigerating volume, high refrigerating capacity , good refrigerating effect , and low operating and maintaining costs .