本文简要介绍我国首次自行设计自行制造的１５１、２５ｔ真空下加热，真空下吹氧的炉外精炼设备真空系统的概况，并就真空系统设计中有关ＶＨＤ／ＶＯＤ精炼炉水蒸汽喷射泵的抽气能力的选择、真空管道通导能力的计算、极限真空、真空度和工作真空度的设计等问题，略谈点滴． This article briefly introduces our country for the first time to design their own self-made 151,25 t vacuum under the vacuum, vacuum oxygen blowing furnace refining equipment vacuum system overview, and the vacuum system design VHD / VOD refining furnace steam jet pump exhaust The choice of ability, the calculation of the capacity of the vacuum pipeline conduction, the ultimate vacuum, the degree of vacuum and the design of the working vacuum and so on, a little bit about.