【摘要】 采用高真空多层绝热结构,研制了一套超临界氦球形贮罐。对贮罐进行漏热估算和应力校核,漏热估算为1.44 W,应力符合设计要求。在液氦加注过程中,监测液氦温度波动特别大,且温度计引线管上有结霜现象出现,分析漏热原因是出现了剧烈热声振荡。将温度计引线管与增压管连通,连通后热声振荡消除。对该超临界氦贮罐进行液氦密封憋压绝热性能测试,液氦压力到达2 MPa的时间约7.5 h,压力平均上升速率为0.267 MPa/h,换算成漏热量为12 W,仍远远大于漏热估算值,分析是由于在连通管路中形成了环流,造成较大漏热。提出了该类超临界氦贮罐的设计改进原则。更多还原

【Abstract】 A spherical supercritical helium Dewar was developed with high-vacuum multilayer thermal insulation.The heat loss of Dewar was estimated to be 1.44 W and the maximum stress and displacement meet requirements.During the liquid helium filling,the temperature fluctuation in Dewar occurred and the thermometer fairlead was covered with frost,which meant large heat loss.Thermo-acoustic oscillation,may be the reason but disappeared when connecting the thermometer fairlead and pressure inlet.The insulation performance at closed status was measured.The pressure of liquid helium reached 2 MPa for 7.5 h and the rise speed was 0.267 MPa/h.The heat loss was 12 W,which was far larger than the estimated value.The reason may be the circulating flow in the connecting pipe.The design and improvement principles were proposed at last.更多还原