强度高，耐腐蚀。
内壁型线设计成对数螺旋线，对风机冲击小，振动小，噪音低，效率高。
蜗壳的作用是收集从叶轮出来的气体，并引导到蜗壳的出口，把气体输送到管道中去，有的蜗壳将气体的部分动压转变为静压。
High strength and corrosion resistance.
The inner wall profile is designed as a logarithmicspiral, which has small impact on the blower.
small vibration, low noise and high efficiency.
The function of the volute is to collect the gas fromthe impeller, guide it to the outlet of the volute,and transport the gas to the pipe. Some volutes
convert part of the dynamic pressure of the gasinto static pressure.
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