公开(公告)号：US06578367B1

公开(公告)日：2003-06-17

申请号：US09796800

申请日：2001-03-02

申请人： John W. Schaefer ,  Mark Heyman

发明人： John W. Schaefer ,  Mark Heyman

IPC分类号： F25B1900

CPC分类号： F25D29/001 ,  F25D3/102

摘要： A liquid nitrogen cooling assembly incorporating a liquid detector which feeds back to control the nitrogen supply is disclosed. A pressure-controlled nitrogen source (e.g., a dewar) feeds liquid nitrogen to a heat exchanger mounted to a differential scanning calorimetry (DSC) cell. The DSC cell is cooled as liquid nitrogen in the heat exchanger contacting the cell is vaporized into nitrogen gas. The exhaust (nitrogen gas and, occasionally, nitrogen liquid) is fed to a liquid detection/evaporator assembly. If liquid nitrogen is detected in the exhaust by the liquid detection/evaporator assembly, an indication is fed back using a liquid detection feedback loop to a pressure control device. The pressure control device reduces the amount of pressure on the nitrogen source in order to eliminate liquid in the exhaust. When there is liquid in the exhaust, the liquid detection/evaporator assembly also collects and vaporizes the exhaust liquid so that it can be properly vented to atmosphere in gas form. When liquid is no longer detected in the exhaust, the pressure control device increases the pressure on the liquid nitrogen source until liquid is detected in the exhaust. Subsequent cycles control pressure in this manner to keep the heat exchanger full of liquid nitrogen.

摘要翻译： 公开了一种包含反馈以控制氮气供应的液体检测器的液氮冷却组件。 压力控制的氮源（例如，杜瓦瓶）将液氮送入安装在差示扫描量热法（DSC）池的热交换器。 在接触细胞的热交换器中，将液体氮气冷却到氮气气氛中。 将排气（氮气，有时为氮气）供给到液体检测/蒸发器组件。 如果通过液体检测/蒸发器组件在排气中检测到液氮，则使用液体检测反馈回路向压力控制装置反馈指示。 压力控制装置减少氮源上的压力量，以消除排气中的液体。 当排气中存在液体时，液体检测/蒸发器组件也收集和蒸发排出液体，使其能够以气体形式适当地排放到大气中。 当在排气中不再检测到液体时，压力控制装置增加液氮源上的压力，直到在排气中检测到液体。 随后的循环以这种方式控制压力以保持热交换器充满液氮。