在中间压力腔上部设有浮动密封装置，因此涡旋顶部受排气压力与中间压力作用。
In the middle pressure chamber upside sets floating seal device, so vortex top and middle pressure by exhaust pressure role.
在经济器系统的设计中，中间补气压力往往通过理论分析和计算确定，但所得结果与实际情况并不能很好符合。
In design of economizer, the gas addition pressure used to be determined by theoretical analysis and calculation, and the result cann't agree with what is real.
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