英语翻译The action of the centrifugal fan,expressed in simple terms,is as follows:when the fan wheel,A (Fig.25.2),carrying the blades or vanes,B,revolves in its casing,the air is moved by the blades,but does not continue to rotate with them.Inste

英语翻译The action of the centrifugal fan,expressed in simple terms,is as follows:when the fan wheel,A (Fig.25.2),carrying the blades or vanes,B,revolves in its casing,the air is moved by the blades,but does not continue to rotate with them.Inste
英语翻译
The action of the centrifugal fan,expressed in simple terms,is as follows:when the fan wheel,A (Fig.25.2),carrying the blades or vanes,B,revolves in its casing,the air is moved by the blades,but does not continue to rotate with them.Instead,it is thrown outwards by centrifugal force to the casing,as shown by the arrow,BC,just as a stone flies off from the common sling.⑦This displacement of air from the fan center to the circumference causes a reduced pressure at the fan center or inlet,I,towards which more air moves,to be thrown in turn to the circumference,thereby keeping up a continuous flow of air through the fan.⑧ If,therefore,the casing has an opening ,as at DD,to allow the air to escape and the center or inlet of the fan is connected to the upcast shaft by means of a fan drift,air will be sucked up the upcast shaft and discharged into the atmosphere at the oulet,O.⑨Thus the upcast air column is rare fied or rendered less dense than that in the downcast shaft.The heavier air in the downcast shaft descends the mine,and after passing around the mine and up the upcast shaft ultimately arrives at the fan to be discharged into the atmosphere.
The chief feature of the centrifugal fan is the blading,and its number,shape,size and arrangement have an important effect upon the operation of the fan.Modern centrifugal fans ususlly have a large number of small blades,up to 64 for a single-inlet fan which sucks air in only on one side,and up to 128 for double-inlet fans which take air on both sides⑩ Fans nowadays rarely exceed 20 ft in diameter,and run at much higher speeds of revolution than the older and large types.

英语翻译The action of the centrifugal fan,expressed in simple terms,is as follows:when the fan wheel,A (Fig.25.2),carrying the blades or vanes,B,revolves in its casing,the air is moved by the blades,but does not continue to rotate with them.Inste
该行动的离心风机,表达了简单来说,就是如下：当风扇车轮,（ fig.25.2 ） ,进行叶片或叶片,乙,围绕在其套管,空气所动刀片,但不继续轮流与them.instead ,这是向外抛出,由离心力,以套管,显示箭头,公元前,正如一位石材苍蝇从共同吊索.⑦这种位移的空气从范中心到周长原因减少的压力,在樊中心或进气道,我,对更多的空中动作,被扔在谈一下围,从而保持了连续流动的空气通过风扇.⑧因此,如果套管有开放的,因为在房屋署副署长,让空气逃脱中心或进气道的风扇连接到upcast轴通过一个风扇漂移,空气将被吸了upcast轴和排放到大气中,在oulet ,澳⑨因此upcast空栏是罕见然后将该或使其密度较低,比在downcast轴.较重的空气在downcast轴降地雷,并合格后,周围的地雷和加快upcast轴,最终抵达在樊被排放到大气中.
行政特征的离心风机是叶栅,其数目,形状,大小,并安排有重要影响的运作风扇.现代离心式风机ususlly有数目庞大的小刀片,最多64个,为单进范,其中吸收空气中,只在一边,而多达128个,为双向进气风扇,其中以空气就双方⑩球迷现在很少超过20英尺,直径,并运行在高得多的速度比革命