The thermos flask consists of an inner liner, a casing and an attached part.
The inner liner is composed of two glass bottles inside and outside. The two are connected to the bottle at the mouth of the bottle, double wall gap vacuum vacuum to weaken the heat convection, the glass bottle wall surface coated bright silver film, reflecting the infrared radiation line. In the bottle, the thermal energy of the content is not outward radiation; when the bottle is low temperature, the outer heat energy does not radiate into the bottle. Thermos flask effectively controls the conduction, heat convection and radiation 3 kinds of heat transfer.
Thermos bottle Insulation is the weak point. In the glass inside and outside the bottle mouth connection has heat conduction, the bottle mouth usually by cork or plastic plug blocking heat dissipation. Thus, the larger the capacity of Thermos flask, the smaller the bottle mouth, the higher the insulation efficiency. It is very important to maintain a high vacuum in the sandwich wall. If the interlayer is gradually inflated or damaged by the small tail gas, destroy the sandwich vacuum state, thermos flask is lost insulation efficiency.
Thermos flask is made of glass material, but also made of stainless steel or non-toxic and smelly plastics. Metal refills rugged, not easy to damage, but the thermal conductivity is much greater than the glass, made of refills insulation performance slightly worse. A single-layer or double-walled container made of plastics, filled with foam insulation, lightweight and convenient, is not easy to break, but its insulation efficiency is worse than vacuum refills.
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