中低压车用消防泵中压室冷却孔的设计与计算

Design and calculation of middle/low pressure fire pump′s cooling hole

针对CB20.10/30.60型中低压车用消防泵在低压工况运转时,中压室发热现象,提出在中压室增加循环冷却水的解决方案:在角阀体上开一小孔,使得在角阀关闭状态下低压室的水能进入中压室进行冷却,增加回水管路,中压室的水能够回到水泵吸入口.该方案中,冷却孔孔径的确定成为关键,提出了冷却孔的理论计算方法,结合试验验证,最终确定出中压室冷却孔径的合理尺寸,解决了中压室发热问题.

When the CB20 · 10/30 · 60 middle/low pressure vehicle-use fire pump works under lowpressure 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 middh-pressure room is determined and eventually the high temperature problem of the middle-pressure room is resolved.