The calculating formula of determining compressor structure parameter is derived by thermodynamic counter calculation based on motor power.
推导出了按电动机功率，通过热力学逆运算，确定压缩机结构参数的计算公式。
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The variation of counter-force and bearing force is discussed, the reasons of forward setting are obtained, the calculating formula about forward setting distance is deduced.
In this paper, the formula. of distribution coefficient of the counter-balancing shearing force in the structure of water gate is derived by method of mechanics of material.