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本文探讨三通阀总流量波动的普遍公式,提出最佳阀权度的概念并建立寻找最佳阀权度的标准方程,作出在最佳阀权度下各种三通阀的总流量变化曲线和工作特性曲线。由理论推导证明:非对称型(直线——等百分比理想特性)三通阀与冷热水热交换器相配,当阀权度P_v=0.367时,既可保证自动调节系统的稳定性,还可使阀压降比P_v=0.5时减小42％,从而使水泵的扬程显著降低。对于一个调节支路管段阻力为1公斤/厘米~2、负荷流量为135米~3/小时的热交换装置,每年可节电1.8万千瓦小时。
This paper discusses the general formula of total flow fluctuation of three-way valve, puts forward the concept of optimal valve weight and establishes the standard equation for finding the optimal valve weight, and makes the total flow curve of various three-way valves under the optimal valve weight. And operating characteristic curve. The theoretical derivation proves that the asymmetric type (straight - equal percentage ideal characteristic) three-way valve is matched with the hot and cold water heat exchanger. When the valve weight P_v=0.367, it can ensure the stability of the automatic adjustment system, but also The valve pressure drop is reduced by 42% compared to P_v=0.5, thereby significantly reducing the pump head. For a heat exchange device with a branch resistance of 1 kg/cm2 and a load flow of 135 to 3/hr, it can save 18,000 kWh annually.