采用多层绝热技术,将能够获得热传递性能的改善。许多紧密相间的绝热材料层的插入,极大地增加了暴露于真空绝热空间中的表面积和材料层中的节流孔道。实验证明,采用恰当的抽空降压步骤,固有的抽气困难是能够加以克服的。这种经改进的多层绝热的特性,完全可以应用于实验室中低温恒温器的绝热,这种容器要时常被放气和重新抽空。试验装置、实验步骤和理论计算都已 The use of multi-layer insulation technology, will be able to get the improvement of heat transfer performance. The insertion of many layers of closely spaced thermal insulation material greatly increases the surface area exposed in the vacuum insulated space and the orifice in the material layer. Experiments show that the use of appropriate step-down pump step, the inherent pumping difficulties can be overcome. This improved multi-layer insulation is fully suitable for thermal insulation of cryogenic thermostats in laboratories, which are often deflated and re-evacuated. Experimental equipment, experimental procedures and theoretical calculations have been