这里介绍了一种高效节能的冰激凌机螺旋翅片直冷式圆形冷冻缸蒸发器，并指出其实现的关键技术。
This text introduce one kind of high efficiency and energy saving screwy fins evaporator with round direct-cooling type refrigerating cylinder, and also indicate the key working technology.
介绍了一种双面换热的套管式直流蒸汽发生器，其元件由直管外管和螺旋内管组成。
The once-through steam generator with double-side heat transfer component was presented in this paper. And the component is composed of straight tube outside and helix tube inside.
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