由我们研制的几种杜瓦瓶表明,将多层绝热结构应用于低温液氦实验杜瓦瓶,代替液氮保护,可以得到良好的效果. 我们研制的口径为φ5120mm、φ150mm、φ200mm,内胆容积分别为10升、27升、38升,用铝箔和玻璃纤维纸作多层绝热结构的液氦实验杜瓦瓶液氦平均蒸发率分别为100毫升/小时、120毫升/小时、180毫升/小时,适于低温实验室推广使用. 另一个口径为φ120mm,内胆容积为10升,用喷铝涤纶薄膜和两个铜屏作多层绝热结构的液氦实验杜瓦瓶已使用六年,液氦蒸发率小于200毫升/小时.在该杜瓦瓶夹层中放有八个铜-康铜热偶温度计,提供了有关屏温分布的参考数据. Several Dewar bottles developed by us show that the multi-layer insulation structure can be applied to cryogenic liquid helium dewar, instead of liquid nitrogen protection, good results can be obtained.We have developed the caliber φ5120mm, φ150mm, φ200mm, liner Volume of 10 liters, 27 liters, 38 liters, with aluminum foil and glass fiber paper as a multi-layer insulation structure of liquid helium Dewar helium bottle average evaporation rates were 100 ml / h, 120 ml / h, 180 ml / Hour, suitable for low temperature laboratory to promote the use of another caliber φ120mm, liner volume of 10 liters, with aluminum sprayed polyester film and two copper screens for multi-layer insulation structure of liquid helium Dewar has been used for six years, The liquid helium evaporation rate is less than 200 ml / h.There are eight copper-constantan thermocouple thermometers in the Dewar flask interlayer, providing reference data on screen temperature distribution.