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近年来,我们设计并试制成功了一种特殊的风机——管道离心风机,它不同于普通离心风机,没有蜗壳,其进气、出气也不像普通离心风机那样互成90°角,而是在同一轴线上。但它也区别于轴流风机,其工作特性却与离心风机相同,比较稳定。由于气流的进、出口是在同一轴线上,无需像普通带蜗壳的离心风机那样与之相连接的风管需转弯,因此,安装十分简便,占用空间极小,如图1所示。空气在普通离心风机内流动时,其能量的变换系由转轴将机械功传给叶轮内的空气,变为静压力及速度能,经过断面渐大的蜗壳,将一部分速度能转变为压力能,以提高空气离开蜗壳时的静压力。这就是说,空气在离心风机内有两次能量变换。空气在叶轮中所增加的静压
In recent years, we have succeeded in designing and trial-producing a special type of fan-pipe centrifugal fan. It is different from ordinary centrifugal fans and has no volute. The inlet and outlet gases do not form 90-degree angles with each other like ordinary centrifugal fans. It is on the same axis. However, it is also different from axial fans. Its operating characteristics are the same as those of centrifugal fans, and they are relatively stable. Since the inlet and outlet of the air flow are on the same axis, it is not necessary to turn the wind pipe connected to it like the centrifugal fan with a volute, so the installation is very simple and takes up very little space, as shown in FIG. 1 . When the air flows in an ordinary centrifugal fan, its energy is converted by the shaft to transmit mechanical work to the air in the impeller, and becomes static pressure and velocity energy. After the volute with an increasing section, a part of the speed energy is converted into pressure energy. To increase the static pressure when the air leaves the volute. This means that the air has two energy changes in the centrifugal fan. Increased static pressure of air in the impeller