This paper analyzes air source in heating system, states that gas is harmful in the system, points out level pipe gradient being small in single measure system, and velocity of flow must keep great.
本文通过分析采暖系统中的空气的来源，提出空气在系统中的危害，针对单户计量系统中水平管坡度较小，提出水平支管中水流速应保持较大。
The invention has the advantage that the material to be conveyed (13) is transported without being influenced by the gradient of the conveyor pipe (3) and that the energy consumption is small.
本发明的优点在于，可以不考虑输送管道（3）的落差来传送物料（13），并且能耗较低。
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