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市场上供应的保温瓶,品种繁多,规格齐全。按其瓶壳材料分类,有竹壳、金属壳、塑料壳、搪瓷壳和不锈钢壳。按保温瓶瓶胆容量大小划分有5,6,7,8,20号大口瓶,适宜冷藏食物。小口瓶有2,3,4,5,7,8,10号多种规格,适宜盛用开水。如果按出水形式不同划分,又有三大类:一种是常用的普通型保温瓶,另二种是气压式保温瓶和虹吸式保温瓶。最近市场上又推出一种新产品——电加热保温瓶。普通型保温瓶的选购,主要检查玻璃瓶胆尾部突出的小嘴子有否断裂,如果已断裂,说明瓶胆中的真空已破坏,该瓶胆即失去保温能力。至于有的人选购保温瓶,用耳朵贴在瓶口,听瓶内声音,认为有“嗡”声
The supply of thermos on the market, a wide variety, complete specifications. According to its classification of shell materials, bamboo shell, metal shell, plastic shell, enamel shell and stainless steel shell. According to the volume of thermos flask gall bladder size 5,6,7,8,20 large mouth bottle, suitable for frozen food. Small mouth bottles 2,3,4,5,7,8,10 a variety of specifications, suitable for Sheng with boiling water. If the water by the different forms of division, there are three categories: one is commonly used ordinary type thermos, the other two are pressure thermos and siphon thermos. Recently introduced a new product on the market - electric heating thermos. Ordinary type thermos purchase, mainly to check the glass bile prominence of the small mouth whether the fracture, if it has broken, that the vacuum in the bottle of vandalism has been destroyed, the bottle of glass that is, lose the ability to heat. As for some people buy thermos bottles, with ears attached to the bottle, listen to the sound bottle, that there is “Om” sound