1.Fire Epuipment Factory of Linyi in Shandong, Linyi, Shandong 276006, China; 2.Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract:When the CB20·10/30·60 middle/low pressure vehicle-use fire pump works under low-pressure operating condition,the middle-pressure room′s temperature will be high.Adding the cycling cooling water to the middle-pressure room is required to resolve this problem.A hole is drilled in the angle valve body to let water in the low-pressure room go into the middle-pressure room and cool it when the angle valve is closed.Meanwhile,water in the middle-pressure room can go back to the suction inlet of the pump through the circling pipe.In the method,determination of the cooling hole diameter is the key.Theoretic calculation of the cooling hole diameter is carried out.Combined with the experiment,the reasonable dimension of the cooling hole of the middle-pressure room is determined and eventually the high temperature problem of the middle-pressure room is resolved.vehicle-use fire pump;middle-pressure room;cooling hole;circling water flow rate;cooling water flow rate
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